CMS. March 01, 2011 BARC, Mumbai. Ram. K. Shivpuri University of Delhi
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1 CMS March 01, 2011 BARC, Mumbai Ram. K. Shivpuri University of Delhi
2 OVERVIEW THE DU GROUP HARDWARE SOFTWARE PHYSICS CONCLUSION
3 A glance at Delhi University (DU) Established in 1922, DU is the premier university of the country and is known for its high standards in teaching and research and attracts eminent scholars to its faculty. At present, there are 16 faculties, 86 academic departments and 77 colleges and 5 other recognised institutes spread all over the city, with about 3,90,000 students. DU has one of the largest number of Centres of Advanced Studies recognized by the UGC.
4 A glance at Delhi University The University has 15 libraries in addition to the libraries in the Colleges. The University Science Instrumentation Centre (USIC) has a number of sophisticated research instruments which are used by several departments of the University and by other institutions in Delhi and its neighbourhood. The University has fibre-optic networks on the North and South Campuses.
5 THE DU GROUP Started in 1970s, DU group participated in International Collaborations like E706 and is in DZERO (4 students got PhD) Emulsion/Bubble Chamber Experiments (16 PhD) Current strength in the CMS Experiment 7 Faculty Members 15 Ph.D. Students + More to join
6 HARDWARE DU & BARC, Mumbai- Responsibility to fabricate 1000 Si Microstrip detectors for Preshower Detector INFRASTRUCTURE CLEAN ROOM-Class 1000 Two laminar flow tables class 100 I-V, C-V System (Keithley based) Measurement setup - KEITHLEY-237, KEITHLEY-590, KEITHLEY-2410 & Probe Station
7 HARDWARE Si Detector for Preshower detector for CMS The development of Si detectors with the desired characteristics was achieved in two phases. Simulation For extracting Process Parameters and Device Characterization. Measurement set ups - Current-Voltage (I-V) and Capacitance-Voltage (C-V). (12 Papers, 2 CMS Notes, 5 PhDs)
8 HARDWARE Process Simulation : TSUPREM-4 To develop a robust and reproducible fabrication technology, the process simulation was carried out using two dimensional process simulator, T- SUPREM IV and was optimized for annealing temperature, ion-implantation dose and annealing time for the CMS detectors. Device Simulation : TMA MEDICI A complete analysis of the effect of various physical and geometrical parameters on these structures was performed with two-dimensional device simulator, TMA-MEDICI for optimization purposes.
9 HARDWARE Keithley Measurement setup was installed by DU group at BEL, Bangalore to carry out measurements. A total of 1000 detectors was fabricated at BEL and delivered to CERN which met their specifications.
10 TIER-3 CLUSTER A small cluster of few nodes - acquired Master/Worker Nodes and NAS. Proceed with the SW installation Video conferencing facility : Plan to go ahead with CMS Center Good bandwidth for CMS
11 PHYSICS QCD + jet, Direct Photon Higgs H ZZ* DU GROUP MIS Exotica
12 PHYSICS Direct Photon physics (1 PhD awarded, 1 ongoing + 1 faculty) Higgs Physics ( 1PhD + 2 Faculty) Excited quark / lepton searches (1 PhD awarded, 1 ongoing + 2 Faculty) LED based on MET+JET ( 1PhD + 1 faculty) Anomalous tri-linear gauge boson coupling ( 1PhD + 1 faculty) Model Independent Searches ( 1PhD + 1 faculty)
13 PHYSICS Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions at s = 7 TeV CMS QCD CMS QCD Measured isolated prompt photon differential cross section and NLO pqcd predictions, as a function of Eg T. Ratio of the measured isolated prompt photon differential cross section to the NLO pqcd predictions..
14 PHYSICS +Jet Analysis The LO (after full simulation) and theoretical LO and NLO calculations for the cross-section of γ +jet events as a function of PγT. The calculated points have been complemented by lines fitting the corresponding cross sections
15 PHYSICS Measurement of the Isolated Diphoton Cross-Section in CMS at s = 7 TeV CMS PAS QCD The measured differential cross section of pp for both photon in barrel and comparison with the theory predictions from ResBos & Diphox.
16 PHYSICS H->ZZ* -> 4l - tt~ Background GEN + SIM + RECO - Vertexing and isolation studies - first feasibility studies performed using Boosted Decision Tree (BDT) CMS AN 2010/237
17 PHYSICS H->ZZ* -> 2l2nu channel - Participating in the 2e2nu analysis (starting from the feasibility studies) important channel for M H > 200 GeV - Working on all aspects Data/MC comparison; Trigger studies; Data-driven background estimation; etc. Inclusive Z and W cross-sections - Working on Muon efficiencies ID, Reco, Trigger, Isolation etc. CMS AN-Note
18 PHYSICS Model Independent Searches (MIS) - MIS is a search for a deviation from expectation without any bias in choosing a particular model - Analysis going for Moriond 1muon+2gamma+MET excl. & 2muon+1jet+MET incl. Preliminary Preliminary
19 PHYSICS EXO IN PROGRESS Search for Excited Leptons
20 PHYSICS Search for Excited Quarks in qq CERN LHC at the Achievable exclusion contours in the Mq parameter space corresponding to different integrated luminosities at the LHC. The regions below the curves can be ruled out at 99% CL
21 PHYSICS Quark Excitations Through the Prism of Direct Photon Plus Jet at the LHC (a) Mq = 1TeV (b) Mq = 5TeV Invariant mass of jet system for Signal+Background and Background after all the isolation and kinematical cuts.
22 PHYSICS Quark Excitations Through the Prism of Direct Photon Plus Jet at the LHC Required integrated luminosity as a function of Mq for (a) 5 and (b) 3 significance for two different coupling strengths (systematic uncertainties are not included).
23 CONCLUSION 8 Ph.D s awarded from CMS work Kirti Ranjan Ashutosh Bhardwaj Sudeep Chatterji M.K. Jha Ashish Kumar Ajay Srivastava Sushil Kumar Pooja Gupta
24 PUBLICATIONS - HARDWARE 1. High-voltage planar Si detectors for high-energy physics experiments: comparison between metal-overhang and field-limiting ring techniques, K. Ranjan, A. Bhardwaj, Namrata, S. Chatterji, A. K. Srivastava, Ashish Kumar, Manoj Kumar Jha and R. K. Shivpuri, Solid State Electronics 48, (2004). 2. Simulation Study of irradiated Si sensors equipped with metal-overhang for applications in LHC environment, S. Chatterji, A. Bhardwaj, K. Ranjan, Namrata, A.K. Srivastava, Ashish Kumar, Manoj Kumar Jha, S.L.Khanna and R. K. Shivpuri, IEEE Trans. Nucl. Sci 51(2), (2004). 3. Breakdown voltage analysis of neutron irradiated silicon detectors, A. Bhardwaj, K. Ranjan, Namrata, S. Chatterji, A. K. Srivastava, A. Kumar, M. K. Jha and R. K. Shivpuri, Eur. Phys. J. AP. 24, 171(2003). 4. Analysis of interstrip capacitance of Si microstrip detector using simulation approach, S. Chatterji, A. Bhardwaj, K. Ranjan, Namrata, A. K. Srivastava and R. K. Shivpuri, Solid State Electronics 47, 1491 (2003). 5. Comparison of p + n junction Formed by BF 2+ and Boron Implantation in Silicon Microstrip Detector with Low and High Thermal Budget: Impact of Fluorine on Electrical Characteristics, Ajay K. Srivastava, A. Bhardwaj, K. Ranjan, Namrata, S. Chatterji, and R. K. Shivpuri, Material Science in Semiconductor Processing Vol.6, Issues 5-6, (2003). 6. Study of parton kt smearing effects in direct photon production at the Fermilab, Tevatron, A. Kumar,, A. Bhardwaj, et al., Physical Review D 68, (July 2003). 7. Study of direct photon production at the CERN LHC, A. Kumar,, A. Bhardwaj, et al., Physical Review D 67, (2003).
25 PUBLICATIONS - HARDWARE 8. A CAD investigation of Metal-overhang on multiple guard ring design for high voltage operation of Si sensors, A. Bhardwaj, K. Ranjan, Namrata, S. Chatterji, A. K. Srivastava and R. K. Shivpuri, Semicond. Sci. Technol. 17, 1226 (2002). 9. Performance characteristics of semi-insulator and dielectric passivated Si strip detectors, K. Ranjan, A. Bhardwaj, Namrata, S. Chatterji, A. K. Srivastava and R. K. Shivpuri, Physica Status Solidi (a) 191(2), 658 (2002). 10. Analysis and Comparison of the breakdown performance of Semi-insulator and dielectric passivated Si Strip detectors, K. Ranjan, A. Bhardwaj, Namrata, S. Chatterji, A. K. Srivastava and R. K. Shivpuri, Nuclear Instruments and Methods in Physical Research A 495, 191 (2002). 11. Two Dimensional Breakdown Voltage Analysis and Optimal Design of Silicon Microstrip Detector Passivated by Dielectric, A. K. Srivastava, A. Bhardwaj, Namrata, S. Chatterji, A. K. Srivastava and R. K. Shivpuri, Semicond. Sci. Technol. 17, 427 (2002). 12. Annealing behaviour of boron implanted defects in Si detector: impact on breakdown performance, S. Chatterji, K. Ranjan, A. Bhardwaj, Namrata, A. K. Srivastava and R. K. Shivpuri, Eur. Phys. J. AP 17, 223 (2002). 13. A new approach to the optimal design of multiple field-limiting ring structures, A. Bharadwaj, K. Ranjan, Namrata, S. Chatterji, A. K. Srivastava and R. K. Shivpuri, Semicond. Sci. Technol. 16, 849 (2001). 14. Analysis and Optimal Design of Si Microstrip Detector with Overhanging Metal Electrode, K. Ranjan, A. Bhardwaj, Namrata, S. Chatterji, A. K. Srivastava and R. K. Shivpuri, Semicond. Sci. Technol. 16, 635 (2001).
26 PUBLICATIONS - HARDWARE CMS NOTES 1. Techniques of improving the Breakdown Voltage of Si Microstrip Preshower detector, A. Bharadwaj, K. Ranjan, Namrata, S. Chatterji, A. K. Srivastava and R. K. Shivpuri, CMS-NOTE (CERN, Geneva), 2001/ Analysis and Comparison of the breakdown performance of Semi-insulator and dielectric passivated Si Strip detectors, K. Ranjan, A. Bhardwaj, Namrata, S. Chatterji, A. K. Srivastava and R. K. Shivpuri, CMS-NOTE (CERN, Geneva), 2002/014.
27 PUBLICATIONS - Physics 1. Study of direct photon plus jet production in CMS experiment at s = 14TeV, P. Gupta, B.C. Choudhary, S. Chatterji, S. Bhattacharya. EPJ-C-Publication pdf, 2. Search for excited quarks in qq at the CERN LHC, Satyaki Bhattacharya, Sushil S. Chauhan, Brajesh C. Choudhary,* and Debajyoti Choudhury, PRD-Excited- Quark-2008.pdf 3. Quark Excitations Through the Prism of Direct Photon Plus Jet at the LHC Satyaki Bhattacharya, Sushil Singh Chauhan, Brajesh Chandra Choudhary and Debajyoti Choudhury. arxiv v1.pdf 4. Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions at s = 7 TeV S. Ahuja, S. Bhattacharya, B.C. Choudhary, P. Gupta, S. Jain, S. Jain, A. Kumar, R.K. Shivpuri. Accepted in PRL - QCD Measurement of ratios of +jets differential Cross Section at s =7 TeV M. Anderson, S. S. Chauhan, V. Chetluru, B. C. Choudhary. QCD Measurement of the Differential Isolated Prompt Photon Production Cross Section in pp Collisions at s = 7 TeV QCD Measurement of the Isolated Diphoton Cross-Section in CMS at s = 7 TeV S. Ahuja, O. Bondu, H. Brun, N.Chanon, G. Chen, B. Choudhary, M.D 351jardin, D. D Enterria, J. Fan, F. Ferri, S. Gascon-Shotkin, P. Gras, M.Lethuillier, J. Malcles, L. Millischer, J. Tao, H. Xiao. QCD
28 PUBLICATIONS - Physics 8. Search for an Excited Electron in pp Collisions at sqrt(s) = 7 TeV, AN S.Bhattacharya, S.Jain, M.Pieri, E.Sudano and Y.Yang 9. Photon Fake Rate Studies for Exotica Analyses, AN Yuri Gershtein, Conor Henderson, Shilpi Jain, Duong Nguyen, Mara Senghi Soares and Yong Yang 10. CMS Fast Simulation: A Tool for Physics Searches at the LHC, CR, 2010 Nuclear Science Symposium and Medical Imaging Conference Shilpi Jain on behalf of CMS collaboration 11. Measurement of inclusive Wg and Zg cross sections and limits on anomalous trilinear gauge boson couplings at 7 TeV. CMS AN Search for Large Extra Dimension in the ADD model using photon plus MET final state in early CMS data. Umberto Berzano, Satyaki Bhattachrya, Sandhya Jain, Albert De Roeck 13. Measurement of inclusive Wg and Zg cross sections and limits on anomalous trilinear gauge boson couplings at 7 TeV. T. Bolton1, A. Bornheim2, O. Bondu3, V. Brigljevi c4, I. Chakaberia1, K.-H. Chen5, S. Dasu6, M. Djordjevic7, S. Duric4, S. Gascon-Shotkin3, M. Gataullin2, B. Gomber9, L. Gray6, O. H. Hindrichs10, F. Raupach10, C.-M. Kuo5, A. Kyriakis11, A. Lanaro6, M. Lethuillier3, S.-W. Li5, Z.-K. Liu5, D. Majumder8, Y. Maravin1, K. Mazumdar8, T. Miceli12, S. Morovi c4, H. Newman2, E. Petrakou11, S. Shrestha1, I. Svintradze1, M. Tripathi12, and J. Veverka2 14. Observation ofwg and Zg production at s = 7 TeV.
29 S. Baffioni et al., CMS AN 2010/237, "Search Strategy for the Higgs Boson in the ZZ* decay channel at s = 10 TeV with the CMS Experiment 15. K. Ranjan & A. Kumar, Projecting exclusion limits on the SM Higgs cross sections by combining HWW and HZZ decay channels Poster, HCP2009: XXth Hadron Collider Physics Symposium, held at Evian (France), Published in Proceedings of Science, PoS (HCP 2009) A. Kumar, A. Pompili, L. Barbone,"4l" Final State workshop, LLR Polytechnic & PRC Univ of Florida, Paris, July , "Impact Parameter observables for the background - rejection in H --> ZZ* --> 4 leptons"
30 THANKS!
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