Risultati 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 physics and proton PDF 3

arxiv:1312.6283 (PRD) W charge asymmetry At 7 TeV, 4 10 6 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

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-12-016 (ZZ2l2ν) arxiv:1406.0113 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

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

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-13-015 σ(w ± W ± jj) = 4.0 +2.4 2.0 (stat)+1.1 1.0 (syst) fb VBFNLO: 5.8 ± 1.2 fb 2.0σ excess from VBS (3.1 expected) 7

CMS PAS FTR-13-006 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

Heavy flavor physics 9

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-13-007 & LHCb-CONF-2013-012 PRL111(2013)101804 Nature! 10

CMS PAS FTR-13-022 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 2018 2021 2023 11

Top-quark physics 12

CMS PAS TOP-14-001 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 = 174.98 ± 0.76 GeV (arxiv:1405.1756, l+jets) LHC and world combinations approved, need to be updated to include the new LHC and Tevatron results 13

CMS-PAS-FTR-13-017 Perspectives on m t Different assumptions done on uncertainty evolutions, including theory (PDF, cross sections, pole vs MC mass, ) 14

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-12-011, ATLAS-CONF-2012-132) : 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-12-002/ATLAS-COM-CONF-2013-061 η j >2.5

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 > 2.0 600 500 400 300-1 -1 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 200 100 Diboson 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 ± 0.12(stat) ± 0.32(syst) 16 [ ] * l = angle between lepton in W rest frame and the W in top rest frame.

tw, s-ch. production tw, 8TeV (12.2fb -1 ): σ tw = 23.4 +5.5-5.4 pb 6.1σ obs. (5.4 +1.5-1.4σ exp.) Main systematics: ME/PS matching, ren./fact. scale 7 TeV: Phys.Rev.Lett 110, 022003 (2013) 8 TeV: Phys. Rev. Lett. 112 (2014) 231802 s-ch.: 8 TeV upper limit: σ s-ch. < 11.5 pb = 2.1 SM, 95%CL Assuming SM signal: σ s-ch. = 6.2 +8.0-5.1 pb (68% FC int.) BDT analysis, sensitivity still limited (0.9σ exp, 0.7σ obs), mainly by theory systematics 17 Events / 0.06 1000 800 600 400 200-1 CMS Preliminary, 19.3 fb, Muons, CMS-PAS-TOP-13-009 s = 8 TeV 0-0.7-0.6-0.5-0.4-0.3-0.2-0.1 0 0.1 0.2 BDT Discriminant data s-channel t-channel tw tt Z+jets W+jets Diboson QCD Syst. unc. Rate syst.

Single top cross sect. summary All measurements are in agreement with approx. NNLO calculations 18

Higgs boson 19

H γγ arxiv:1407.0558 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

Combined σ BR / SM prediction CMS-PAS-HIG-14-009 Nature Phys. 10, 557 560 (2014) arxiv:1408.3316 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

H [GeV] 3 10 2 10 10 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 MeV @ m H = 125.6 GeV) LHC HIGGS XS WG 2010 PLB 736 (2014) 64 1-1 10-2 10 100 200 300 500 1000 M H [GeV] 22

Spin and parity Combination of HWW2l2ν and HZZ4l All tested hypotheses excluded at > 99.9% CL s CMS PAS HIG-14-014 23

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:1307.7135 (snowmass) CMS PAS HIG-13-007 no change in syst. uncert. syst. 1/ lumi, th x0.5 24

Physics Beyond the Standard Model 25

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 2 1 1 & 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 = 0.05 0.50 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 & 123 233 112 112 Summary of CMS SUSY Results* in SMS framework m(mother)-m(lsp)=200 GeV SUS 13-019 L=19.5 /fb SUS-14-011 SUS-13-019 L=19.3 19.5 /fb SUS-13-007 SUS-13-013 L=19.4 19.5 /fb SUS-13-008 SUS-13-013 L=19.5 /fb SUS-13-013 L=19.5 /fb SUS-13-008 SUS-13-013 L=19.5 /fb SUS-13-019 L=19.5 /fb SUS-14-011 L=19.5 /fb SUS-13-011 L=19.5 /fb SUS-13-014 L=19.5 /fb SUS-13-024 SUS-13-004 L=19.5 /fb SUS-13-024 SUS-13-004 L=19.5 /fb SUS-13-018 L=19.4 /fb SUS-13-008 SUS-13-013 L=19.5 /fb SUS-13-008 L=19.5 /fb SUS-13-006 L=19.5 /fb SUS-13-006 L=19.5 /fb SUS-14-002 L=19.5 /fb SUS-13-006 L=19.5 /fb SUS-14-002 L=19.5 /fb SUS-14-002 L=19.5 /fb SUS-13-006 L=19.5 /fb SUS-13-006 L=19.5 /fb SUS-13-006 L=19.5 /fb SUS-12-027 L=9.2 /fb SUS-12-027 L=9.2 /fb SUS-12-027 L=9.2 /fb SUS-12-027 L=9.2 /fb SUS-12-027 L=9.2 /fb EXO-12-049 L=19.5 /fb EXO-12-049 L=19.5 /fb SUS-13-013 L=19.5 /fb SUS-12-027 L=9.2 /fb SUS-12-027 L=9.2 /fb SUS-12-027 L=9.2 /fb SUS-12-027 L=9.2 /fb SUS-12-027 L=9.2 /fb SUS-12-027 L=9.2 /fb SUS-12-027 L=9.2 /fb SUS-13-003 L=19.5 9.2 /fb x = 0.50 x = 0.75 x = 0.05 x = 0.50 x = 0.95 SUS-12-027 L=9.2 /fb SUS-13-003 L=19.5 9.2 /fb SUS-13-003 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 0 200 400 600 800 1000 1200 1400 1600 1800 *Observed limits, theory uncertainties not included Mass scales [GeV] Only a selection of available mass limits Probe *up to* the quoted mass limit

Supersymmetry: perspectives Estimated 5σ discovery at 300, 3000 fb 1 CMS PAS FTR-13-014 27

Latest results on exotic searches EXO-12-041 1 st gen. scalar Lepto-Quark EXO-12-047 Dark Matter &Large Extra Dim in γ+me T EXO-12-020 Contact int. in ll destr. interf. 28

New physics with top quark Boosted topologies (t, W, Z, H, ) will be more and more important at 13-14 TeV B2G-12-009: W tb (boosted) 29

Summary! [pb] Production Cross Section, 5 10 4 10 3 10 2 10 10 1 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 -1 10 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

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

Backup 32