at Low and High Q 2 at H1
|
|
- Augustine Thompson
- 7 years ago
- Views:
Transcription
1 1 Measurement of F c c and F b b at Low and High Q at H1 Tatsiana Klimkovich DESY, FLC, H1
2 Contents Heavy Flavour Production in Perturbative QCD H1 Experiment at HERA Motivation for the Analysis Inclusive Method of Heavy Quark Measurement using simple c- and b-tagging Measurement of F c c and F b b at Low and High Q
3 3 Kinematics of ep Collisions e ± (k) Neutral Current e ± (k ) Lorentz-Invariant Variables: Gauge Boson s Virtuality: transfered momontum from e to p γ, Z (q) X p (p) Charged Current e ± (k) ( ν e ) (k ) Q := q = (k k ), Q 0 Bjørken Scaling Variable: fraction of proton s momentum carried by the interacting parton x := Q P q 0 x 1 Relative energy transfer at the positronboson vertex in the proton rest frame: W ± (q) y := P q P k 0 y 1 p (p) X Q = xys
4 4 Kinematic Regions 1. Photoproduction (γp): Q < 1 GeV Dominant process - exchange of quasireal photons. Low Q Deep Inelastic Scattering (DIS): 1 GeV < Q < 0 GeV Main kinematic regime at HERA for the investigation of the structure of the Kinematics of ep Collisions proton. Dominant process - photon exchange 3. High Q DIS: Q >0 GeV Contribution of Z and W ± exchange Important measurements of proton structure functions for the LHC
5 5 Heavy Flavour Production in Deep Inelastic Scattering Q M HQ Massive scheme Fixed Flavour Number Scheme (FFNS) LO Process: PGF process Q M HQ Massless scheme Zero Mass Variable Flavour Number Scheme (ZM-VFNS) LO Process: QPM process (flavour excitation) Quarks are treated like massive = do not contribute to proton structure function Quarks are treated like massless partons = contribute to proton structure function Do not give reliable description over the whole Q range = Variable FNS: Interpolate between massive and massless schemes avoiding double counting etc. ACOT(CTEQ), MRST Treat properly threshold effects Q M HQ
6 6 H1 Detector p 90 GeV e 7.5 GeV e + p NC 99/000 HERA-I data L 57.4 pb 1 s = 4Ee E p = 318 GeV
7 7 H1 Central Silicon Tracker Consists of two cylindrical layers of double-sided silicon strip detectors surrounding the beam pipe at radii of 5.7 cm and 9.7 cm Covers angular range 30 < θ < 150 Hit resolution: 1 µm in rφ 5 µm in z For CJC tracks with CST hist in both layers DCA resolution in xy plane: 33µm 90µm p T [GeV] The efficiency to link CST hits to a CTD track: 76%
8 8 Motivation for Analysis Aim: to make a measurement of charm and beauty in transition region Q M HQ : 6.3 < Q < 10 GeV in high Q region: Q > 1 GeV Existing Methods: D µ } exclusive methods explicit reconstruction of secondary vertex } Statistically limited! Model dependent extrapolations of exclusive methods: in D analysis extrapolation factors vary from 4.7 to 1.5 in p T and η decreasing with increasing Q = Inclusive method: use CST-improved impact parameter for all tracks Method is based on lifetime information of heavy hadrons Aim to be as inclusive as possible and keep size of extrapolations in p T, η to minimum Fraction of b falls at low Q = experimentally challenging
9 9 Motivation for the Analysis Higgs Production via Quark Fusion at the LHC SM cross section is small due to low Yukawa coupling Can be enhanced in MSSM (h, H, A, H ± ) = knowledge of beauty PDF at the scale Q = m H / or Q = m H /4 is important! This is high Q region at HERA Low Q : measurement of c and b PDFs are important to check the validity of the theoretical descriptions of heavy quark production around the threshold region Q M HQ
10 Technique Look at signed DCA (Distance of Closest Approach Impact Parameter δ) for all tracks with precise measurement from Central Silicon Tracker (CST) rφ plane The sign is infered from a quark axis approximating the flight direction of the decaying hadron Events with secondary vertex decays from heavy flavour particles will have large positive impact parameter w.r.t. primary vertex Light flavour primary decays will have small negative and positive impact parameter due to resolution effects
11 11 Data and Monte Carlo Samples (low Q ) We work with e + p neutral current events, 99/000 HERA-I Data, L 57.4 pb 1, 1.5M events after selection, factor larger than High Q! Monte Carlo: Sample Program Fragmentation L [pb 1 ] uds DJANGO LUND 90 c c RAPGAP LUND 16.9 b b RAPGAP LUND c c RAPGAP Peterson b b RAPGAP Peterson c c CASCADE LUND 14.6 b b CASCADE LUND γp PHOJET LUND.576
12 1 e + in SpaCal We require: 6.3 < Q < 10 GeV y eσ > 0.07 y e < 0.63 for Q < 18 GeV y e < 0.7 for Q > 18 GeV Event Selection Low Q Event in H1 detector -0 cm < z vertex < 0 cm i (E i p z,i ) > 35 GeV (against γp and ISR) R e < 4 cm 0 < R BDC SP ACAL <.5 cm Inclusive Triggers High Q : Q > 1 GeV, e + in LAr
13 13 Track Acceptance (low Q ) Acceptance for a charged track from c, b hadrons to be in CST acceptance (30 < θ < 150, p T > 0.5 GeV) and generated z-vertex within ±0 cm c quarks b quarks x log Track Acceptance for c Quarks y = 0.07 y = max log Q x log Track Acceptance for b Quarks y = 0.07 y = max log Q Acceptance for c is 68% 89% Bin centres from measured F Acceptance for b is 93% 99% y max = 0.65 for Q < GeV y max = 0.7 for Q > GeV
14 14 CST Track Selection p T of Tracks Track reconstruction imrovement: CJC tracks are linked to CST hits (CST tracks) Entries per 0.1 GeV 5 4 Total MC uds c b N CST > 1 Prob link > 0.1 p T > 500 MeV R start < 50 cm L track > cm -18 < z CST hits < 18 cm o Entries per p T Track / GeV θ of Tracks Total MC uds c b o θ Track /
15 15 Quark Axis Description Highest p T jet axis Quark axis is given by: inclusive k T algorithm in the lab. frame p T >.5 GeV 15 < θ < % of matched track-jet events for c 95% of matched track-jet events for b ( > 97% at high Q ) If we don t have jets: Quark axis is approximated by 180 φ elec
16 16 DCA and Significance Tracks matched to quark axis within φ < π/ For matched tracks, plot DCA to primary vertex in rφ plane (δ) Tracks required to have δ < 1 mm (remove e.g. K 0 contribution). Significance of each track given by S i = δ σ(δ) DCA Significance Tracks 6 Total MC 5 4 uds c b Tracks Total MC uds c b δ / cm S i Scale factors to the MC distributions are applied
17 17 Significance (S i ) Definition Events 6 5 Total MC uds c b 5 Total MC S 1 4 uds c b S Events S 1 S Events 4 3 Total MC uds c b S 3 At low Q, beauty fraction is smaller. Need to do more to separate b and c Define three distributions: S 1 highest significance track S nd highest significance track with same sign as S 1 S 3 3rd highest significance track with same sign S 3 as S 1 and S
18 18 Subtracted Significance (S i ) Subtract the negative S i bins from the positive for both data and MC to reduce sensitivity to resolution of light quarks ) ) - n( -S 1 n( S S 1 Total MC uds c b ) n( S 3 ) - n( -S 3 4 Total MC 3 S uds c b S S 3 ) ) - n( -S n( S 4 3 S 3 Total MC uds c b For each x Q bin make a simultaneous fit to S i and total number of inclusive events before CST track selection with 3 parameters: MC scale factor c - P c MC scale factor b - P b S MC scale factor uds - P l
19 19 Fit results: P c = 1.8 ± 0.04, P b = 1.55 ± 0.16, P l = 0.95 ± 0.01 Structure Function Extraction Reduced cross section: σ c c (x, Q ) = σ(x, Q ) P c N MCgen c P c N MCgen c + P b N MCgen b + P l N MCgen l The differential c cross section is calculated from σ c c (x, Q ) as d σ c c dx dq = σc c (x, Q ) πα (1 + (1 y) ) dσc c = f c c /dxdq = xq 4 dσ/dxdq The structure function F c c F c c L d σ c c is then evaluated from the expression dx dq = πα xq 4 [(1 + (1 y) )F c c y F c c L ] is estimated from the NLO QCD expectation
20 0 Systematic Errors (low Q ) source uncertainty error error c c / % b b / % Track efficiency ±.3 (% CJC, 1% CST) DCA resolution ±5µm (±00µm tails) s asymmetry 50% uncertainty Fragmentation LUND / Peterson QCD model Rapgap/CASCADE Structure function Reweight B Multiplicity LEP / SLD D Multiplicity MARKIII Hadronic Energy Scale 4% Quark Axis o (5 o ) shift Total
21 1 DCA resolution for S 1 Most effects in DCA come from the description of the MC of the internal alignment/resolution of the CST 95% of events smeared by 5 µm, 5% of events smeared by 00 µm Events Monte Carlo Events Smeared MC S S 1 Normalised MC before (after) smearing black (red)
22 DCA resolution for S Events Events S S
23 3 DCA resolution for S 3 Events Events S S 3
24 4 Can contribute to systematic errors Description of Light Quark Multiplicity CST Tracks per Event (events after track-jet association) High Q Low Q Entries per bin 6 Total MC 5 uds c b 4 Events Total MC uds c b Number of CST tracks Number of CST tracks uds MC: Rapgap c c, b b MC: Rapgap uds MC: Django c c, b b MC: Rapgap
25 5 Light quark asymmetry Enhance strangeness by looking at events with tracks both with 0.1 < DCA < 0.5 cm. Clear K 0 peak. Reasonable agreement after background subtraction. Events Total MC uds Events c b 50 Total Monte Carlo MC Error band ± 50% of uds track Mass /GeV track Mass /GeV Uncertainty of ±50%
26 6 Reduced Cross Section σ c c σ cc _ 0.6 Q = 1 GeV Q = 5 GeV 0.4 σ c c Consistent results with H1 and ZEUS D measurements Consistent with pqcd predictions Q = 60 GeV Q = 00 GeV MRST04 - Variable FNS CTEQ6HQ - Variable FNS CCFM (Cascade) - Massive scheme Q = 650 GeV x x (High Q ) H1 D ZEUS D MRST04 CTEQ6HQ CCFM
27 7 Reduced Cross Section σ b b σ bb _ Q = 1 GeV Q = 5 GeV σ b b First measurement of σ b b Consistent with pqcd predictions MRST04 describes the data best Q = 60 GeV Q = 00 GeV MRST04 - Variable FNS CTEQ6HQ - Variable FNS CCFM (Cascade) - Massive scheme Q = 650 GeV x (High Q ) MRST04 CTEQ6HQ CCFM x
28 F c c vs Q F b b vs Q 8 _ F cc 4 i x=0.000 i=5 x= i=4 _ F bb 8 i x=0.000 i=5 x= i=4 x=0.00 i=3 x=0.00 i=3 x=0.005 i= 1 x=0.005 i= 1-1 (High Q ) H1 D ZEUS D MRST04 MRST NNLO CTEQ6HQ x=0.013 i=1 x=0.03 i=0-1 - (High Q ) MRST04 MRST NNLO CTEQ6HQ x=0.013 i=1 x=0.03 i=0-1 3 Q /GeV -3 3 Q /GeV
29 9 f qq_ f cc_ f bb_ -1 x = x = Contribution to σ: f q q = dσq q /dxdq dσ/dxdq c and b fractions fall towards low Q b fraction falls by a larger amount MRST04 f cc_ MRST04 f bb _ -1 x = 0.00 x = MRST04 - Variable FNS -1 x = x = 0.03 (High Q ) f cc _ f bb _ - 3 Q / GeV 3 Q / GeV
30 30 Data vs Theory for σ b b σ bb_ / σ bb_ NLO QCD H1 F bb _ H1 F bb _ (high Q ) Impact Parameter (low Q ) Impact Parameter 1 QCD NLO (VFNS) QCD NLO (massive) 0 Q [GeV ]
31 31 Conclusions The first measurement of F b b in the low and high Q kinematic regime Good description by predictions of perturbative QCD calculations First measurement of F b b 4% of charm and 0.8% of beauty contribution to the total ep cross section at low Q 18% of charm and.7% of beauty contribution to the total ep cross section at high Q
32 3 Outlook Increased statistics using HERA II data Single and di-jet cross section measurements using b-tagged jets with increased statistics. = Basis to test models relevant for heavy quark jet production at the LHC
33 33 HERA is taking lumi... till 007 INTEGRATED LUMINOSITY ( )
Jet Reconstruction in CMS using Charged Tracks only
Jet Reconstruction in CMS using Charged Tracks only Andreas Hinzmann for the CMS Collaboration JET2010 12 Aug 2010 Jet Reconstruction in CMS Calorimeter Jets clustered from calorimeter towers independent
More informationH & II in Inclusive Jet Production
on behalf of the Collaboration Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 49, 76 Hamburg, Germany E-mail: monica.turcato@desy.de A summary of the most recent results by the
More informationMeasurement of the Mass of the Top Quark in the l+ Jets Channel Using the Matrix Element Method
Measurement of the Mass of the Top Quark in the l+ Jets Channel Using the Matrix Element Method Carlos Garcia University of Rochester For the DØ Collaboration APS Meeting 2007 Outline Introduction Top
More informationSelected Results on Diffraction at HERA
Selected Results on Diffraction at HERA Grzegorz Gach Various Faces of QCD May 014 Grzegorz Gach Selected Results on Diffraction at HERA 1 HERA DESY, Hamburg 199-007 e/e + - p 7.5 GeV 80 GeV 90 GeV Ldt
More informationCalorimetry in particle physics experiments
Calorimetry in particle physics experiments Unit n. 8 Calibration techniques Roberta Arcidiacono Lecture overview Introduction Hardware Calibration Test Beam Calibration In-situ Calibration (EM calorimeters)
More informationTop rediscovery at ATLAS and CMS
Top rediscovery at ATLAS and CMS on behalf of ATLAS and CMS collaborations CNRS/IN2P3 & UJF/ENSPG, LPSC, Grenoble, France E-mail: julien.donini@lpsc.in2p3.fr We describe the plans and strategies of the
More informationvariables to investigate Monte Carlo methods of t t production
Using the M 2 and variables to investigate Monte Carlo methods of t t production Caitlin Jones September 8, 25 Abstract In this project the behaviour of Monte Carlo simulations for the event t t! ` `+b
More informationReal Time Tracking with ATLAS Silicon Detectors and its Applications to Beauty Hadron Physics
Real Time Tracking with ATLAS Silicon Detectors and its Applications to Beauty Hadron Physics Carlo Schiavi Dottorato in Fisica - XVII Ciclo Outline The ATLAS Experiment The SiTrack Algorithm Application
More informationHow To Find The Higgs Boson
Dezső Horváth: Search for Higgs bosons Balaton Summer School, Balatongyörök, 07.07.2009 p. 1/25 Search for Higgs bosons Balaton Summer School, Balatongyörök, 07.07.2009 Dezső Horváth MTA KFKI Research
More informationCMS Physics Analysis Summary
Available on the CERN CDS information server CMS PAS RK-10-002 CMS Physics Analysis Summary Contact: cms-pog-conveners-tracking@cern.ch 2010/07/20 Measurement of racking Efficiency he CMS Collaboration
More informationMeasurement of Neutralino Mass Differences with CMS in Dilepton Final States at the Benchmark Point LM9
Measurement of Neutralino Mass Differences with CMS in Dilepton Final States at the Benchmark Point LM9, Katja Klein, Lutz Feld, Niklas Mohr 1. Physikalisches Institut B RWTH Aachen Introduction Fast discovery
More informationThe TOTEM experiment at the LHC: results and perspective
The TOTEM experiment at the LHC: results and perspective Edoardo Bossini Università degli studi di Siena and INFN-Pisa (on behalf of the TOTEM collaboration) Trieste, 24 Settembre 2013 OUTLINE: Detector
More informationMeasurement of the Beauty Cross Section using the Semileptonic Decay into Electrons at HERA
Measurement of the Beauty Cross Section using the Semileptonic Decay into Electrons at HERA Dissertation zur Erlangung des Doktorgrades des Fachbereichs Physik der Universität Hamburg vorgelegt von Bengt
More informationProton tracking for medical imaging and dosimetry
Proton tracking for medical imaging and dosimetry J.Taylor, P.Allport, G.Casse For the PRaVDA Consortium 1 Background and motivation - What is the PRaVDA experiment? - Why are we using Monte Carlo? GEANT4
More informationPrecise measurements of the proton structure towards the new physics discoveries at the LHC
June 2015 Precise measurements of the proton structure towards the new physics discoveries at the LHC Voica Radescu Physikalisches Institut Heidelberg Early ideas Ideas for detecting quarks were formulated
More informationStudy of the B D* ℓ ν with the Partial Reconstruction Technique
Study of the B D* ℓ ν with the Partial Reconstruction Technique + University of Ferrara / INFN Ferrara Dottorato di Ricerca in Fisica Ciclo XVII Mirco Andreotti 4 March 25 Measurement of B(B D*ℓν) from
More informationt th signal: theory status
t th signal: theory status M.V. Garzelli MTA - DE Particle Physics Research Group, Univ. Debrecen, Hungary e-mail: garzelli@to.infn.it LHC HXSWG Workshop CERN, June 12-13th, 2014 t th production at LHC
More informationVertex and track reconstruction with the ALICE Inner Tracking System
Vertex and track reconstruction with the ALICE Inner Tracking System The 5th International Nordic "LHC and Beyond" Workshop St.Petersburg, 8-11 June 2010 Leonardo Milano Univ. & INFN, Torino for the ALICE
More informationPhysik des Higgs Bosons. Higgs decays V( ) Re( ) Im( ) Figures and calculations from A. Djouadi, Phys.Rept. 457 (2008) 1-216
: Higgs decays V( ) Re( ) Im( ) Figures and calculations from A. Djouadi, Phys.Rept. 457 (2008) 1-216 1 Reminder 10.6.2014 Higgs couplings: 2 Reminder 10.6.2014 Higgs BF as a function of mh Higgs total
More informationPHYSICS WITH LHC EARLY DATA
PHYSICS WITH LHC EARLY DATA ONE OF THE LAST PROPHETIC TALKS ON THIS SUBJECT HOPEFULLY We may have some two month of the Machine operation in 2008 LONG HISTORY... I will extensively use: Fabiola GIANOTTI
More informationPoS(Kruger 2010)013. Setting of the ATLAS Jet Energy Scale. Michele Petteni Simon Fraser University E-mail: mpetteni@sfu.ca
Setting of the ALAS Energy Scale Simon Fraser University E-mail: mpetteni@sfu.ca he setting of the energy scale and its uncertainty in the ALAS detector is presented. After a brief introduction of the
More informationExtraction of Polarised Quark Distributions of the Nucleon from Deep Inelastic Scattering at the HERMES Experiment
Extraction of Polarised Quark Distributions of the Nucleon from Deep Inelastic Scattering at the HERMES Experiment Marc Beckmann FAKULTÄT FÜR PHYSIK ALBERT-LUDWIGS-UNIVERSITÄT FREIBURG Extraction of Polarised
More informationCross section, Flux, Luminosity, Scattering Rates
Cross section, Flux, Luminosity, Scattering Rates Table of Contents Paul Avery (Andrey Korytov) Sep. 9, 013 1 Introduction... 1 Cross section, flux and scattering... 1 3 Scattering length λ and λ ρ...
More informationTheoretical Particle Physics FYTN04: Oral Exam Questions, version ht15
Theoretical Particle Physics FYTN04: Oral Exam Questions, version ht15 Examples of The questions are roughly ordered by chapter but are often connected across the different chapters. Ordering is as in
More informationTrack Trigger and Modules For the HLT
CMS L1 Track Trigger for SLHC Anders Ryd for the CMS Track Trigger Task Force Vertex 2009 Sept. 13-18, 2009 L=1035 cm-2s-1 Outline: SLHC trigger challenge Tracking triggers Track trigger modules Simulation
More informationATLAS NOTE ATLAS-CONF-2010-063. July 21, 2010. Search for top pair candidate events in ATLAS at s = 7 TeV. The ATLAS Collaboration.
ATLAS NOTE ATLAS-CONF-2010-063 July 21, 2010 Search for top pair candidate events in ATLAS at s = 7 TeV The ATLAS Collaboration Abstract A search is performed for events consistent with top quark pair
More informationPrHEP JHW2002. Experiments on high energy reactions in the diffractive regime at LHC. 1. Introduction. Twenty-sixth Johns Hopkins Workshop
PROCEEDINGS Experiments on high energy reactions in the diffractive regime at LHC Helsinki Institute for Physics, c/o CERN, Route de Meyrin, CH-1211 Geneva 23, Switzerland E-mail: Stefan.Tapprogge@cern.ch
More informationHow To Teach Physics At The Lhc
LHC discoveries and Particle Physics Concepts for Education Farid Ould- Saada, University of Oslo On behalf of IPPOG EPS- HEP, Vienna, 25.07.2015 A successful program LHC data are successfully deployed
More informationCMS Tracking Performance Results from early LHC Running
CMS Tracking Performance Results from early LHC Running CMS PAPER TRK-10-001 L. Spiegel, K. Stenson, M. Swartz 1 First Collisions Tracking Paper Provide description of tracker, tracking algorithm, and
More informationHigh Energy Physics. Lecture 4 More kinematics and a picture show of particle collisions
High Energy Physics Lecture 4 More kinematics and a picture show of particle collisions 1 Recall from the previous lecture: the momentum of the scattered Particle in an elastic collision is given by p
More informationA SUSY SO(10) GUT with 2 Intermediate Scales
A SUSY SO(10) GUT with 2 Intermediate Scales Manuel Drees Bonn University & Bethe Center for Theoretical Physics SUSY SO(10) p. 1/25 Contents 1 Motivation: SO(10), intermediate scales SUSY SO(10) p. 2/25
More informationTheory versus Experiment. Prof. Jorgen D Hondt Vrije Universiteit Brussel jodhondt@vub.ac.be
Theory versus Experiment Prof. Jorgen D Hondt Vrije Universiteit Brussel jodhondt@vub.ac.be Theory versus Experiment Pag. 2 Dangerous cocktail!!! Pag. 3 The basics in these lectures Part1 : Theory meets
More informationBounding the Higgs width at the LHC
Bounding the Higgs width at the LHC Higgs XSWG workshop, June 2014 John Campbell, Fermilab with K. Ellis, C. Williams 1107.5569, 1311.3589, 1312.1628 Reminder of the method This is the essence of the original
More informationSearch for Dark Matter at the LHC
Search for Dark Matter at the LHC Steven Lowette Vrije Universiteit Brussel - IIHE 19 November 2014 3rd CosPa Meeting Université de Liège Content Introduction Generic DM searches at the LHC Explicit DM
More informationSingle-Top Production at the Tevatron and the LHC: Results and Prospects
Single-Top Production at the Tevatron and the LHC: Results and Prospects Wolfgang Wagner Bergische Universität Wuppertal DESY Zeuthen, June 16, 2011 Content: 1) Introduction / History 2) Experimental Status
More informationTop-Quark Studies at CMS
Top-Quark Studies at CMS Tim Christiansen (CERN) on behalf of the CMS Collaboration ICHEP 2010, Paris 35th International Conference on High-Energy Physics tt 2 km 22 28 July 2010 Single-top 4 km New Physics
More informationVector-like quarks t and partners
Vector-like quarks t and partners Luca Panizzi University of Southampton, UK Outline Motivations and Current Status 2 Couplings and constraints 3 Signatures at LHC Outline Motivations and Current Status
More informationFCC 1309180800 JGU WBS_v0034.xlsm
1 Accelerators 1.1 Hadron injectors 1.1.1 Overall design parameters 1.1.1.1 Performance and gap of existing injector chain 1.1.1.2 Performance and gap of existing injector chain 1.1.1.3 Baseline parameters
More information0.33 d down 1 1. 0.33 c charm + 2 3. 0 0 1.5 s strange 1 3. 0 0 0.5 t top + 2 3. 0 0 172 b bottom 1 3
Chapter 16 Constituent Quark Model Quarks are fundamental spin- 1 particles from which all hadrons are made up. Baryons consist of three quarks, whereas mesons consist of a quark and an anti-quark. There
More informationJets energy calibration in ATLAS
Jets energy calibration in ATLAS V.Giangiobbe Università di Pisa INFN sezione di Pisa Supported by the ARTEMIS Research Training Network Workshop sui Monte Carlo, la Fisica e le Simulazioni a LHC V.Giangiobbe
More informationTracking/Vertexing/BeamSpot/b-tag Results from First Collisions (TRK-10-001)
Tracking/Vertexing/BeamSpot/b-tag Results from First Collisions (TRK-1-1) Yanyan Gao, Fermilab on behalf of Tracking-Btagging POGs 3 March 21 / CERN CMS General Weekly Meeting: GWM8 Contributors and Acknowledgement
More informationPOSSIBL-E EXPERIMENTS ON THE 200-GeV ACCELERATOR. A. D. Krisch University of Michigan. R. Serber Columbia University.
FN-68 POSSIBL-E EXPERIMENTS ON THE 200-GeV ACCELERATOR A. D. Krisch University of Michigan R. Serber Columbia University August 23, 1967 We will describe a number of experiments that might be dcne on.,he
More informationTHE TOP QUARK Updated September 2013 by T.M. Liss (Univ. Illinois), F. Maltoni (Univ. Catholique de Louvain), and A. Quadt (Univ. Göttingen).
1 THE TOP QUARK Updated September 2013 by T.M. Liss (Univ. Illinois), F. Maltoni (Univ. Catholique de Louvain), and A. Quadt (Univ. Göttingen). A. Introduction The top quark is the Q = 2/3, T 3 = +1/2
More informationImplications of CMS searches for the Constrained MSSM A Bayesian approach
Implications of CMS searches for the Constrained MSSM A Bayesian approach Małgorzata Kazana, Yue-Lin Sming Tsai On behalf of the BayesFITS group National Centre for Nuclear Research Warsaw, Poland BayesFITS,
More informationarxiv:1006.5339v1 [hep-ph] 28 Jun 2010
FR-PHENO-2010-021 arxiv:1006.5339v1 [hep-ph] 28 Jun 2010 NLO QCD corrections to 4 b-quark production University of Illinois at Urbana-Champaign, Urbana IL, 61801 USA E-mail: ngreiner@illinois.edu Alberto
More informationMeasurement of the t -Channel Single Top-Quark Production Cross-Section with the ATLAS Detector at s = 7 TeV
FACHBEREICH MAHEMAIK UND NAURWISSENSCHAFEN FACHGRUPPE PHYSIK BERGISCHE UNIVERSIÄ WUPPERAL Measurement of the t -Channel Single op-quark Production Cross-Section with the ALAS Detector at s = 7 ev Dissertation
More informationPerformance Evalua/on and So2ware Development of FPCCD Vertex Detector for ILC
Performance Evalua/on and So2ware Development of FPCCD Vertex Detector for ILC MORI Tatsuya, KAMAI Daisuke, MIYAMOTO Akiya A SUGIMOTO Yasuhiro A, ISHIKAWA Akimasa, SUEHARA Taikan, KATO Eriko, YAMAMOTO
More informationInformation about the T9 beam line and experimental facilities
Information about the T9 beam line and experimental facilities The incoming proton beam from the PS accelerator impinges on the North target and thus produces the particles for the T9 beam line. The collisions
More informationElectroweak effects in Higgs boson production
Electroweak effects in Higgs boson production Frank Petriello University of Wisconsin, Madison w/c. Anastasiou, R. Boughezal 0811.3458 w/ W. Y. Keung, WIP Outline Brief review of experiment, theory for
More informationA new inclusive secondary vertex algorithm for b-jet tagging in ATLAS
Home Search Collections Journals About Contact us My IOPscience A new inclusive secondary vertex algorithm for b-jet tagging in This content has been downloaded from IOPscience. Please scroll down to see
More informationarxiv:hep-ph/0310009v1 1 Oct 2003
arxiv:hep-ph/319v1 1 Oct 23 HADRONISATION AT LEP ELI BEN-HAIM Laboratoire de l Accélérateur Linéaire (L.A.L.), Université Paris-Sud, Bâtiment 2, BP 34, F-91898 Orsay cedex, France An overview of recent
More informationThe Backward Silicon Track Trigger of the HERA Experiment H1
The Backward Silicon Track Trigger of the HERA Experiment H1 DISSERTATION zur Erlangung des akademischen Grades doctor rerum naturalium (Dr. rer. nat.) im Fach Physik eingereicht an der Mathematisch-Naturwissenschaftlichen
More informationFrom Jet Scaling to Jet Vetos
From Jet Scaling to Jet Vetos Heidelberg DESY, 2/202 LHC Higgs analyses Two problems for LHC Higgs analyses [talks Rauch, Englert] observe H b b decays [fat Higgs jets, Marcel s talk] 2 understand jet
More informationHighlights of Recent CMS Results. Dmytro Kovalskyi (UCSB)
Highlights of Recent CMS Results Dmytro Kovalskyi (UCSB) Introduction Number of CMS publication is over 0 already It is very hard to review all the recent results in one talk This talk concentrates on
More informationDiese Dissertation ist auf den Internetseiten der Hochschulbibliothek online verfügbar.
! "#%$'&)( *,+.-/. 24365 -.38795 :*,;=?( @A-B3DCE/ FHGI$.7J#)*K@A-B3DCE/:$ &LM-B3>:*ON,CQPDPD()$?PSR.=?-.7T39( $ &)( *VUW=?(.CX$ CQPSR.=BY[Z\(BP93]7^5 -_2QCQP`RB=_( $'ab(.r.=:$ CQPSR.=?( $dce#fr.=?psr.=:)2g(ihe-?r.=?(
More informationarxiv:hep-ph/9607427v1 25 Jul 1996
DFTT 44/96 IFT-96-16 MPI-PhT/96-63 hep-ph/967427 arxiv:hep-ph/967427v1 25 Jul 1996 New proton polarized structure functions in charged current processes at HERA M. Anselmino, P. Gambino, J. Kalinowski,1
More informationRecent developments in Electromagnetic Hadron Form Factors
Recent developments in Electromagnetic Hadron Form Factors (JOH7RPDVL*XVWDIVVRQ '$31,$63K16DFOD\ :KDW are Form Factors? :K\ to measure? +RZ to measure? :KDWLVQHZ" Consequences, Conclusions 6SRNHSHUVR QV
More informationOperation and Performance of the CMS Silicon Tracker
Operation and Performance of the CMS Silicon Tracker Manfred Krammer 1 on behalf of the CMS Tracker Collaboration Institute of High Energy Physics, Austrian Academy of Sciences, Vienna, Austria Abstract.
More informationPart 4 fitting with energy loss and multiple scattering non gaussian uncertainties outliers
Part 4 fitting with energy loss and multiple scattering non gaussian uncertainties outliers material intersections to treat material effects in track fit, locate material 'intersections' along particle
More informationMiddle East Technical University. Studying Selected Tools for HEP: CalcHEP
Middle East Technical University Department of Physics Advanced Selected Problems in Physics Studying Selected Tools for HEP: CalcHEP Author: Jack Yakup Araz Supervisor: Assoc. Prof Ismail Turan December
More informationACCELERATORS AND MEDICAL PHYSICS 2
ACCELERATORS AND MEDICAL PHYSICS 2 Ugo Amaldi University of Milano Bicocca and TERA Foundation EPFL 2-28.10.10 - U. Amaldi 1 The icone of radiation therapy Radiation beam in matter EPFL 2-28.10.10 - U.
More informationarxiv:hep-ph/0310021v2 4 Oct 2003
Physics in Collision - Zeuthen, Germany, June 6-8, 003 arxiv:hep-ph/0300v 4 Oct 003 SEARCHES FOR NEW PARTICLES AT THE ENERGY FRONTIER AT THE TEVATRON Patrice VERDIER LAL, Université Paris-Sud, 9898 Orsay
More information1 Experiments (Brahms, PHENIX, and STAR)
1 Experiments (Brahms, PHENIX, and STAR) This section describes the three experiments capable of making spin measurements. 1.1 PHENIX RHIC has made great strides towards providing high luminosity beams
More informationConcepts in Theoretical Physics
Concepts in Theoretical Physics Lecture 6: Particle Physics David Tong e 2 The Structure of Things 4πc 1 137 e d ν u Four fundamental particles Repeated twice! va, 9608085, 9902033 Four fundamental forces
More informationarxiv:1508.07811v1 [hep-ph] 31 Aug 2015
DESY 5-47 RAL-P-05-007 reating jet correlations in high pile-up at hadron colliders arxiv:508.078v [hep-ph] 3 Aug 05 F. Hautmann,, H. Jung, 3, 4 and H. Van Haevermaet 4 Rutherford Appleton Laboratory &
More informationarxiv:hep-ph/9812492v1 24 Dec 1998
MPI-PhT/96-14(extended version) July 1996 A Note on QCD Corrections to A b FB using Thrust to arxiv:hep-ph/9812492v1 24 Dec 1998 determine the b-quark Direction Bodo Lampe Max Planck Institut für Physik
More informationThe Experimental H.E.P. Group of the. Outline
The Experimental H.E.P. Group of the Universidad Autónoma de Madrid a http://hepexp.ft.uam.es Luis Labarga Departamento de Física Teórica Universidad Autónoma de Madrid Dates and People Outline The ZEUS
More informationThe Standard Model of Particle Physics - II
The Standard Model of Particle Physics II Lecture 4 Gauge Theory and Symmetries Quantum Chromodynamics Neutrinos Eram Rizvi Royal Institution London 6 th March 2012 Outline A Century of Particle Scattering
More informationPerformance of the CMS cathode strip chambers with cosmic rays
Home Search Collections Journals About Contact us My IOPscience Performance of the CMS cathode strip chambers with cosmic rays This article has been downloaded from IOPscience. Please scroll down to see
More informationCombining fixed order QCD calculation with the parton shower Monte Carlo new PV prescription for IR singularities
Combining fixed order QCD calculation with the parton shower Monte Carlo new PV prescription for IR singularities O. Gituliar, S. Jadach, A. Kusina, W. Płaczek, S. Sapeta, A. Siódmok, M. Skrzypek Partly
More informationMICE detectors and first results. M. Bonesini Sezione INFN Milano Bicocca
MICE detectors and first results M. Bonesini Sezione INFN Milano Bicocca I will speak of the installed beamline PID detectors (TOFes, CKOVs, KL) and only shortly of EMR (to be built)/ the trackers (tested
More informationGamma-rays from Dark Matter Mini-Spikes in Andromeda Galaxy M31. Mattia Fornasa Dipartimento di Fisica G. Galilei I.N.F.N. Padova
Gamma-rays from Dark Matter Mini-Spikes in Andromeda Galaxy M31 Mattia Fornasa Dipartimento di Fisica G. Galilei I.N.F.N. Padova based on astro-ph/0703757 by M. Fornasa, M. Taoso and G.Bertone Journal
More informationEUTelescope: tracking software
EUTelescope: tracking software A. Bulgheroni, T. Klimkovich, P. Roloff, A.F. Żarnecki December 3, 2007 Abstract The main goal of the JRA1 within the EUDET project is the construction of new and the improvement
More informationPhenomeological Determination of the Orbital Angular Momentum
Phenomeological Determination of the Orbital Angular Momentum Gordon P. Ramsey Loyola University Chicago and Argonne National Lab Collaboration with Y. Binder & D. Sivers SPIN 2008, University of Virginia-Oct.
More informationarxiv:nucl-ex/0507023v2 18 Jul 2005
Diffraction Dissociation - 50 Years later Sebastian N. White Brookhaven National Laboratory, Upton, N.Y. 11973, USA arxiv:nucl-ex/0507023v2 18 Jul 2005 Abstract. The field of Diffraction Dissociation,
More informationRisultati recenti dell'esperimento CMS ad LHC e prospettive per il run a 14 TeV
Risultati recenti dell'esperimento CMS ad LHC e prospettive per il run a 14 TeV Luca Lista INFN Napoli 1 78 reconstructed vertices CMS experiment CMS recorded 5fb-1 at 7 TeV and 20 fb-1 at 8 TeV 2 Electroweak
More informationParticle Physics. Bryan Webber University of Cambridge. IMPRS, Munich. 19-23 November 2007
Monte Carlo Methods in Particle Physics University of Cambridge IMPRS, Munich 19-23 November 2007 See also ESW: QCD and Collider Physics, C.U.P. 1996 http://www.hep.phy.cam.ac.uk/theory/webber/qcdupdates.html
More informationThe OPERA Emulsions. Jan Lenkeit. Hamburg Student Seminar, 12 June 2008. Institut für Experimentalphysik Forschungsgruppe Neutrinophysik
The OPERA Emulsions Jan Lenkeit Institut für Experimentalphysik Forschungsgruppe Neutrinophysik Hamburg Student Seminar, 12 June 2008 1/43 Outline The OPERA experiment Nuclear emulsions The OPERA emulsions
More informationOpen access to data and analysis tools from the CMS experiment at the LHC
Open access to data and analysis tools from the CMS experiment at the LHC Thomas McCauley (for the CMS Collaboration and QuarkNet) University of Notre Dame, USA thomas.mccauley@cern.ch! 5 Feb 2015 Outline
More informationTesting thermo-acoustic sound generation in water with proton and laser beams
International ARENA Workshop DESY, Zeuthen 17th 19th of May 25 Testing thermo-acoustic sound generation in water with proton and laser beams Kay Graf Universität Erlangen-Nürnberg Physikalisches Institut
More informationDelphes, a framework for fast simulation of a general purpose LHC detector
Delphes, a framework for fast simulation of a general purpose LHC detector S. Ovyn and X. Rouby Center for Particle Physics and Phenomenology (CP3) Université catholique de Louvain B-1348 Louvain-la-Neuve,
More informationSelected Topics in Elementary Particle Physics ( Haupt-Seminar )
Selected Topics in Elementary Particle Physics ( Haupt-Seminar ) Paola Avella, Veronika Chobanova, Luigi Li Gioi, Christian Kiesling, Hans-Günther Moser, Martin Ritter, Pit Vanhoefer Time: Do, 12 ct -14
More informationElectron Muon Ranger (EMR) Software Development
Electron Muon Ranger (EMR) Software Development François Drielsma on behalf of the EMR Group University of Geneva June 25, 2014 François Drielsma on behalf of the EMR Group Electron (University Muon of
More informationThe accurate calibration of all detectors is crucial for the subsequent data
Chapter 4 Calibration The accurate calibration of all detectors is crucial for the subsequent data analysis. The stability of the gain and offset for energy and time calibration of all detectors involved
More informationBiasing. 7 th FLUKA Course NEA Paris, Sept.29-Oct.3, 2008
Biasing 7 th FLUKA Course NEA Paris, Sept.29-Oct.3, 2008 Overview General concepts: Analog vs. biased Monte Carlo calculation Biasing options (only the most important / common options available in FLUKA)
More informationCalibration of the muon momentum resolution in view of the W mass measurement with the CMS experiment
Calibration of the muon momentum resolution in view of the W mass measurement with the CMS experiment GIULIA RIPELLINO Master of Science Thesis Supervisor CERN: Luigi Rolandi Supervisor KTH: Jonas Strandberg
More informationSpecial Theory of Relativity
Special Theory of Relativity In ~1895, used simple Galilean Transformations x = x - vt t = t But observed that the speed of light, c, is always measured to travel at the same speed even if seen from different,
More informationLocal and Global Duality and the Determination of α(m Z )
MZ-TH/99-18, CLNS/99-1619, hep-ph/9905373, May 1999 Local and Global Duality and the Determination of α(m Z ) arxiv:hep-ph/9905373v1 17 May 1999 Stefan Groote Institut für Physik, Johannes-Gutenberg-Universität,
More informationSingle Top Production at the Tevatron
Single Top Production at the Tevatron Daniel Wicke (Bergische Universität Wuppertal) Introduction Outline DØ Cross Section CDF Results DØ V tb Conclusions Revision : 1.7 DESY-Zeuthen, 21-Feb-2007 1 Introduction
More informationThree-nucleon interaction dynamics studied via the deuteron-proton breakup. Elżbieta Stephan Institute of Physics, University of Silesia
Three-nucleon interaction dynamics studied via the deuteron-proton breakup Elżbieta Stephan Institute of Physics, University of Silesia Studies of the 1 H(d,pp)n Breakup at 130 MeV University of Silesia,
More informationJürgen R. Reuter, DESY. J.R.Reuter Status Report on WHIZARD ALCW 2015, KEK, 21.4.2015
Status Report on the Event Generator WHIZARD Jürgen R. Reuter, DESY The WHIZARD Event Generator Universal event generator for lepton and hadron colliders Modular package: - Phase space parameterization
More informationA Study of the Top Quark Production Threshold at a Future Electron-Positron Linear Collider
A Study of the Top Quark Production Threshold at a Future Electron-Positron Linear Collider Filimon Gournaris Department of Physics and Astronomy University College London A thesis submitted for the degree
More information90 degrees Bremsstrahlung Source Term Produced in Thick Targets by 50 MeV to 10 GeV Electrons
SLAC-PUB-7722 January 9 degrees Bremsstrahlung Source Term Produced in Thick Targets by 5 MeV to GeV Electrons X. S. Mao et al. Presented at the Ninth International Conference on Radiation Shielding, Tsukuba,
More informationMasses in Atomic Units
Nuclear Composition - the forces binding protons and neutrons in the nucleus are much stronger (binding energy of MeV) than the forces binding electrons to the atom (binding energy of ev) - the constituents
More informationStatus of ALICE activities within FKPPL LIA
Status of ALICE activities within FKPPL LIA 1 Development of the online monitoring software for the ALICE Muon Trigger And Suppression Study for Υ S A N G - U N A H N K O N K U K U N I V E R S I T Y S
More informationDevelopment of on line monitor detectors used for clinical routine in proton and ion therapy
Development of on line monitor detectors used for clinical routine in proton and ion therapy A. Ansarinejad Torino, february 8 th, 2010 Overview Hadrontherapy CNAO Project Monitor system: Part1:preliminary
More informationResearch Management Plan (RMP) for the. STAR Heavy Flavor Tracker (HFT)
Research Management Plan (RMP) for the STAR Heavy Flavor Tracker (HFT) Version 4 March 31, 2009 1. Introduction This document describes the plans of a group of institutions within the STAR collaboration
More informationPrecision Electroweak Measurements with the LBNF Near Detector
Precision Electroweak Measurements with the LBNF Near Detector R. Petti University of South Carolina, USA CETUP Near Detector Physics Workshop Deadwood, SD, USA, July 10-21, 2014 MOTIVATIONS A new measurement
More informationCharm-Produktion in Tiefinelastischer Streuung am ZEUS-Experiment in der Datennahmeperiode von HERA-II
Charm-Produktion in Tiefinelastischer Streuung am ZEUS-Experiment in der Datennahmeperiode von HERA-II DISSERTATION zur Erlangung der Doktorwürde der Fakultät für Mathematik und Physik der Albert-Ludwigs-Universität
More informationMeasurement of the Z boson differential cross-section in transverse momentum in the electron-positron channel with the ATLAS detector at LHC.
Measurement of the Z boson differential cross-section in transverse momentum in the electron-positron channel with the ALAS detector at LHC. Homero Martinez o cite this version: Homero Martinez. Measurement
More information