Risultati recenti dell'esperimento CMS ad LHC e prospettive per il run a 14 TeV
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1 Risultati recenti dell'esperimento CMS ad LHC e prospettive per il run a 14 TeV Luca Lista INFN Napoli 1
2 78 reconstructed vertices CMS experiment CMS recorded 5fb-1 at 7 TeV and 20 fb-1 at 8 TeV 2
3 Electroweak physics and proton PDF 3
4 arxiv: (PRD) W charge asymmetry At 7 TeV, Wµν candidates produced per fb 1 Differential W charge asymmetry precisely probes u/d ratio vs. x Asymmetry measured to 0.1% absolute per bin Constrains all PDF families 4
5 Diboson production ZZ (8 TeV) 300 ZZ4l candidates (also one τ pair) observed at 8 TeV/ experiment with SM rate and shapes 200 ZZ2l2ν candidates observed at 8 TeV WW (7 TeV) Thousands of candidates in dilepton channel Leading lepton p T shows no anomalous contribution Significant diboson signal in semileptonic channel Higher BR and low background at high p T gives superior TGC constraint ZZ 4l ZZ mass CMS-PAS-SMP (ZZ2l2ν) arxiv: PLB (ZZ4l) EPJC 73 (2013) 2610 (WW, dilept.) EPJC 73 (2013) 2283 (WW, WZ, dijets) WW leading lepton p T, 7 TeV ZZ 2l2v Z PT 5
6 Charged atgcs: World Summary Best single LHC 7 TeV measurements equal LEP2 or Tevatron combinations Semileptonic WW gives the best information on κ and λ, leptonic WW and WZ better for g. LHC 8 TeV will provide 2-3 better constraints, eclipsing LEP2 ZZγ, Zγγ WWZ 6
7 W ± W ± scattering CMS: 500 GeV dijet mass and 2.5 dijet rapidity gap, wit top veto, Z veto, and dilepton mass > 50 GeV Most remaining background is fake/non-prompt leptons Observed events agree with SM predictions CMS-PAS-SMP σ(w ± W ± jj) = (stat) (syst) fb VBFNLO: 5.8 ± 1.2 fb 2.0σ excess from VBS (3.1 expected) 7
8 CMS PAS FTR VV scattering: future prospects Snowmass study to understand VBS potential of Run2+ assessments of the discovery potential for observing longitudinal vector boson scattering at 300 and 3000 fb 1 8
9 Heavy flavor physics 9
10 B 0 s/d µ+ µ Stringent test of new physics in penguin diagrams Challenging analysis, all muon information exploited by a BDT used to separate genuine muons from misidentified charged hadrons Final combination with LHCb performed using fill combined fit 6.2σ for the B 0 s µ+ µ (exp. SM 7.6σ); 4.3σ CMS alone First observation 3.2σ for the B 0 d µ+ µ (exp. SM 0.8σ) CMS PAS BPH & LHCb-CONF PRL111(2013) Nature! 10
11 CMS PAS FTR B 0 s/dµ + µ : prospects for run II and beyond Assuming SM BR and planned detector upgrades Hi-Lumi: improve inner tracking granularity and muon detector coverage today
12 Top-quark physics 12
13 CMS PAS TOP Top-quark mass m t Recently improved CMS improved the top-mass measurement from l + jets: Reached ultimate Tevatron precision, Most precise measurement by D0: m t = ± 0.76 GeV (arxiv: , l+jets) LHC and world combinations approved, need to be updated to include the new LHC and Tevatron results 13
14 CMS-PAS-FTR Perspectives on m t Different assumptions done on uncertainty evolutions, including theory (PDF, cross sections, pole vs MC mass, ) 14
15 t channel: CMS Signal region: one e or µ, 2jets-1tag events Signal, W+jets, tt yields determined from a fit to the η j distribution Shapes for W+jets and tt are determined from control regions in data σ t-ch. = 83.6 ± 2.3(stat) ± 7.4(syst) pb R 8/7 = 1.24 ± 0.08(stat) ± 0.12(syst) Largest uncertainty: signal modeling (POWHEG vs COMPHEP), jet energy scale 15 LHC Combination: (TOPLHCWG, using BLUE), using preliminary result (CMS PAS TOP , ATLAS-CONF ) : σ t-ch. = 85 ± 4(stat) ± 11(syst) ± 3(lumi) pb = 85 ± 12 pb To be updated with latest results! JHEP06(2014)090 CMS PAS TOP /ATLAS-COM-CONF η j >2.5
16 t-channel: distributions The t-channel data sample is large enough to study distributions differential cross sections Signal can be enhanced by requiring e.g.: large forward jet pseudorapidity: ηj > CMS Preliminary, 5.0 fb, s = 8 TeV CMS Preliminary, 5.0 fb, 180 data 160 t-channel lepton charge cosθ* [ ] 140 s-channel l tw-channel 120 tt 100 Z+jets W+jets 80 s = 8 TeV data t-channel s-channel tw-channel tt Z+jets W+jets Diboson 60 QCD Diboson QCD muon charge cos!* R t = σ t (t)/σ t (t ) = 1.95 ± 0.10(stat) ± 0.19(syst) P l = 0.82 ± 0.12(stat) ± 0.32(syst) 16 [ ] * l = angle between lepton in W rest frame and the W in top rest frame.
![0 fb, 180 data 160 t-channel lepton charge cosθ* [ ] 140 s-channel l tw-channel 120 tt 100 Z+jets W+jets 80 s = 8 TeV data t-channel s-channel tw-channel tt Z+jets W+jets 200 100 Diboson](/docs-images/45/3882629/images/page_16.jpg "60 QCD 40 20 Diboson QCD 0-2 -1.5-1 -0.5 0 0.5 1 1.5 2 muon charge 0-1 -0.8-0.6-0.4-0.2 0 0.2 0.4 0.6 0.8 1 cos!* R t = σ t (t)/σ t (t ) = 1.95 ± 0.10(stat) ± 0.19(syst) P l = 0.82 ± 0.")
17 tw, s-ch. production tw, 8TeV (12.2fb -1 ): σ tw = pb 6.1σ obs. ( σ exp.) Main systematics: ME/PS matching, ren./fact. scale 7 TeV: Phys.Rev.Lett 110, (2013) 8 TeV: Phys. Rev. Lett. 112 (2014) s-ch.: 8 TeV upper limit: σ s-ch. < 11.5 pb = 2.1 SM, 95%CL Assuming SM signal: σ s-ch. = pb (68% FC int.) BDT analysis, sensitivity still limited (0.9σ exp, 0.7σ obs), mainly by theory systematics 17 Events / CMS Preliminary, 19.3 fb, Muons, CMS-PAS-TOP s = 8 TeV BDT Discriminant data s-channel t-channel tw tt Z+jets W+jets Diboson QCD Syst. unc. Rate syst.
18 Single top cross sect. summary All measurements are in agreement with approx. NNLO calculations 18
19 Higgs boson 19
20 H γγ arxiv: EPJC New analysis of the entire data sample 5.7σ obs. (5.2σexp.) Updated Higgs mass measurement in γγ: Combined with ZZ*: best individual Higgs-mass measurement, and the best single-experiment combination 20
21 Combined σ BR / SM prediction CMS-PAS-HIG Nature Phys. 10, (2014) arxiv: JHEP Consistent measurements, combination gives χ 2 =10.5/16, p-value = 0.84 Largest deviation: tth-tagged: +2.0σ (same-sign dimuons) CMS is the only experiment to publish evidence of Higgs coupling to fermions and to leptons 21
22 H [GeV] Higgs boson width ZZ4l (2D: m4l, gg vs qq discr.), ZZ2l2ν (jet-incl. m T shape) / SM < 8.0 (10.1) 4l, <8.1(106) 2l2ν / SM < 5.4 (8.0) combined ( SM = 4.15 m H = GeV) LHC HIGGS XS WG 2010 PLB 736 (2014) M H [GeV] 22
23 Spin and parity Combination of HWW2l2ν and HZZ4l All tested hypotheses excluded at > 99.9% CL s CMS PAS HIG
24 Higgs perspectives 300 fb 1 at 14 TeV: important improvement w.r.t. present dataset 3000 fb 1 : Hµµ assessed at > 5σ. Higgs self coupling? arxiv: (snowmass) CMS PAS HIG no change in syst. uncert. syst. 1/ lumi, th x0.5 24
25 Physics Beyond the Standard Model 25
26 0 & g " qq % 0 & g " bb % 0 & g " tt % 0 & g " t( t " t % ) ± 0 & & g " qq( % " W% ) ± 0 & & g " b( b " t( % " W% )) t 0 & t " t % + 0 & & t " b( % " W% ) 0 0 & & " t b % ( % " H G) & 0 t " ( t " t % ) Z 2 1 & 01 t " ( t " t % ) H & 0 & ± & 0 & 0 % % " lll # % % 2 0 & & % % " l l # # % % & 0 & 0 & 0 & 0 % % " Z Z % % 2 02 & ± & & 0 & 0 % % " W Z % % 2 & 0 & 0 & 0 & 0 % % " H Z % % 2 2 & ± & 0 & 0 & 0 % % " H W % % & 0 2 & ± & 0 & 0 % % " ll$ # % % 2 & 0 & ± & 0 & 0 % % " $$$ # % % 2 g " qqb! '' 113/223 g " qqq! '' q " qll#! 122 q " qll#! 123 q " qll#! 233 q " qbtµ! ' 231 q " qbtµ! ' 233 " qqqq! '' R 112 " µ e # t! R 122 t " µ $# t! R 123 t " µ $# t! R 233 t " tbtµ! ' R 233 q t b b b g " qll# g " qll# g " qll# g " qbtµ g " qbtµ g " tbs g " qqqq 0 & q " q % 0 & " b % 0 & " tw % 0 & " bz % 0 & l " l %! 122!! 233! ' 231! '! '' 323! '' x = 0.25 x = 0.95 x = x = 0.50 x = 0.20 Supersymmetry No hint in all explored channels Will be the main player of run II at higher energy 26 RPV slepton EWK gauginos sbottom stop squark gluino production + & 0 & Summary of CMS SUSY Results* in SMS framework m(mother)-m(lsp)=200 GeV SUS L=19.5 /fb SUS SUS L= /fb SUS SUS L= /fb SUS SUS L=19.5 /fb SUS L=19.5 /fb SUS SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS SUS L=19.5 /fb SUS SUS L=19.5 /fb SUS L=19.4 /fb SUS SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=19.5 /fb SUS L=9.2 /fb SUS L=9.2 /fb SUS L=9.2 /fb SUS L=9.2 /fb SUS L=9.2 /fb EXO L=19.5 /fb EXO L=19.5 /fb SUS L=19.5 /fb SUS L=9.2 /fb SUS L=9.2 /fb SUS L=9.2 /fb SUS L=9.2 /fb SUS L=9.2 /fb SUS L=9.2 /fb SUS L=9.2 /fb SUS L= /fb x = 0.50 x = 0.75 x = 0.05 x = 0.50 x = 0.95 SUS L=9.2 /fb SUS L= /fb SUS L=19.5 /fb ICHEP 2014 m(lsp)=0 GeV CMS Preliminary For decays with intermediate mass, m intermediate = x'm +(1-x)'m mother lsp *Observed limits, theory uncertainties not included Mass scales [GeV] Only a selection of available mass limits Probe *up to* the quoted mass limit
27 Supersymmetry: perspectives Estimated 5σ discovery at 300, 3000 fb 1 CMS PAS FTR
28 Latest results on exotic searches EXO st gen. scalar Lepto-Quark EXO Dark Matter &Large Extra Dim in γ+me T EXO Contact int. in ll destr. interf. 28
29 New physics with top quark Boosted topologies (t, W, Z, H, ) will be more and more important at TeV B2G : W tb (boosted) 29
30 Summary! [pb] Production Cross Section, Feb 2014 "n jet(s) "n jet(s) W and Z bosons =n jet(s) CMS Preliminary -1 7 TeV CMS measurement (L & 5.0 fb ) -1 8 TeV CMS measurement (L & 19.6 fb ) 7 TeV Theory prediction 8 TeV Theory prediction CMS 95%CL limit Top quark Higgs W Z W # Z# WW WZ ZZ ##$ WW EW qqll WV# tt tt-ch tw t s-ch tt# ttz ggh VBF VH qqh Th. %! H in exp. %! tth 30
31 Conclusions Fantastic results achieved with present dataset ranging from precision physics, Higgs boson post-discovery measurements, to extensive range of searches for new physics Getting ready for run II, where an unexplored landscape will be disclosed, and possibly new physics signals will show up 31
32 Backup 32
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