CMS Physics Analysis in China Guoming CHEN IHEP, CAS 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Outline Bc (IHEP) J/ψ (PKU) HVV (IHEP) Dimuon trigger at low luminosity (IHEP, PKU) D0 (IHEP) Plan 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Bc introduction ( c) ,Unique character: doubly heavy flavored. Suggested by Prof. C.H. Chang (ITP) The experimental study of Bc will help: 1) To study the heavy quark dynamics; 2) To test the spin symmetry derived in NRQCD and HQET; 3) To tag Bs in mixing 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN TEVATRON: CDF 20 J/ψ lυ events, mass : 6.40±0.13 GeV life time : ps 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN M(Bc): 6402.0±22.0 MeV Input:6400MeV cτ(Bc): 148.8±13.1 μm Input 150 μm 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Systematic Summary Bc mass (MeV) Bc cτ (μm) P scale 11 0.2 P smear 10 0.8 Vertex smear / 2.4 Cuts 0.1 Efficiency Theoretical 1.5 Total 14.9 3.0 CMS 1/fb: Mass: 22.0(fit) ±14.9(syst) MeV lifetime: 0.044(fit) ±0.010(syst) ps 4/10/2019 Sino-French LHC workshop Guoming CHEN

This analysis is finished http://agenda.cern.ch/fullAgenda.php?ida=a042390 http://indico.cern.ch/conferenceDisplay.py?confId=a054841 http://indico.cern.ch/conferenceDisplay.py?confId=a06926 http://indico.cern.ch/conferenceDisplay.py?confId=1726 http://indico.cern.ch/conferenceDisplay.py?confId=1647 2 notes： Analysis-Note 2006/079 CMS-Note 2006/118 Approved by the CMS physics meeting Included into the Physics TDR

Sino-French LHC workshop Guoming CHEN Prompt J/ψ (PKU) 1-2 order of magnitude discrepancy between CSM prediction and CDF Result Prompt charmonium production black dot: CDF experiment dashed line: color-singlet solid line : NRQCD fit 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Problem: Polarization of Heavy Quarkonia CDF RUN 1 results PRL, 85 (2000) 2886 a=+1: transversely polarized a=-1: longitudinally polarized CDF RUN 2 results 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Quarkonia Polarization @ CMS Higher luminosity:  better statistics in general  especially important for  which is expected to be described better by NRQCD Higher Collision Energy:  larger cross-section  higher PT region reached Better Muon Measurement  preferable for J/Y  m+m-,   m+m- CMS will measure the cross section and polarization More precisely 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Polarization extraction: The Loop Fitting Normalize to the MC templates Weighted efficiency Signal Pt distribution a=0 efficiency Weighted efficiency …… Solid Line is alpha input Data point is alpha fit value 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Polarization extraction: Neural Network Fit 4/10/2019 Sino-French LHC workshop Guoming CHEN

HVV coupling measurement To check: whether there exists a sub-TeV Higgs Boson. 2. to discriminate new physics model from that of the SM. 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Prof. Y.P. Kuang proposed a sensitive way to measure the HVVC via like-sign leptons final states It is d u v p + W + l + W --------- H + v W + + p u W l d 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Extraction of coupling constant fw through cross section Normalized to 300 fb-1 4/10/2019 Sino-French LHC workshop Guoming CHEN

Through two leptons’ invariant mass Normalized to 300 fb-1 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Backgrounds channels Sigma Events/300 (fb ) Obtained via Grid job or reconstructed by myself WZ 3l 4.4E-10 (mb) 32000 40000 ZZ 4l 1.6E-11 (mb) 4800 Z0 t t 4l + X 1.7 (fb) 510 1000 W+ t t 3l + X 3.0 (fb) 900 t t 4l + X 1.25E-9 (mb) 375000 121000 Zbb_4l+(njets) 2E-11 (mb) 6000 129000 Zbb_cc_4l+(njets) 8E-12 (mb) 2400 3000 ZWjets_leptonic 2.6E-9 (mb) 780000 50000 ZZjets_leptonic 1.5E-10 (mb) 45000 100000 -1 _ _ _ 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Dimuon trigger study With the first 1/fb data, it is intended to collect a large amount of: 1) prompt J/ψ to calibrate the detector and to study the polarization; 2) B hadrons contain J/ψ decay to check the performance of the detector; Bs→ J/ψ φ to study CP violation; And to collect enough Bc to measure it’s mass and life time They are all low pT stuff, low pT dimuon trigger is needed, but the HLT rates must be within the bandwidth allowed. 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Dimuon trigger study QCD μPt >3GeV μPt >4GeV μPt >5GeV μPt >6GeV μPt >7GeV 0_15 ( 21.511.0) (11.6 7.2) ( 2.42.1) (0.9 1.0) (0.3 0.5) 15_20 ( 18.03.0) ( 12.62.3) (5.4 1.2) (2.30.6) (1.0 0.3) 20_30 ( 25.71.9) (18.6 1.9) ( 11.61.3) ( 6.40.6) (3.1 0.4) 30_50 ( 23.41.6) (18.7 1.6) (12.3 0.9) ( 7.30.6) (4.5 0.5) 50_80 ( 13.90.4) (11.3 0.4) ( 8.60.2) (6.1 0.2) ( 4.00.2) 80_120 ( 5.60.3) (4.7 0.3) ( 3.80.3) (2.8 0.1) (2.1 0.1) 120_170 (1.9 0.0) (1.6 0.5) ( 1.30.0) (1.0 0.0) (0.8 0.0) 170_230 (0.7 0.0) (0.6 0.0) (0.4 0.0) (0.3 0.0) 230_300 ( 0.20.0) (0.2 0.0) (0.1 0.0) 300_380 380_470 (0.0 0.0) ( 0.00.0) Total (111 11.7) ( 80.18.0) (46.3 2.9) ( 27.51.5) ( 16.30.9) QCD rate at 1033 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN D0 reconstruction To monitor the calibration and alignment status through: momentum scale, resolution vertex resolution To calibrate the mu/h and e/h separation To calibrate the PDL resolution for Bc life time measurement 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN 1,100,000 events 0.0485 pb-1 QCD D0 QCD 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Our study show that: The number of D0’s collected one day at 5x1029 (900GeV collision) is about 1500 Enough to check the momentum scale and resolution 4/10/2019 Sino-French LHC workshop Guoming CHEN

Sino-French LHC workshop Guoming CHEN Plan Blind search through (IHEP) dimuon final states WZ final states (Z→μμ) Higgs search through H→ZZ, Z→μμ, Z→υυ (IHEP) Heavy Majorana neutrino search (IHEP) Higgs→DM (PKU) Top polarization &CP violation study (PKU) 4/10/2019 Sino-French LHC workshop Guoming CHEN