Latest CMS Results on ϕs

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Latest CMS Results on ϕs Prafulla Kumar Behera IIT Madras, India, On Behalf of CMS Collaboration 9th International Workshop on the CKM Unitarity Triangle (CKM2016) TIFR, Mumbai 29th November, 2016

Outline Motivation Analysis procedure Results Conclusions Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Motivation No direct evidence of physics beyond the SM has been found at LHC More Important to test the SM in various ways Study of the weak Bs decay phase (ϕs) the decay width difference (ΔΓs ) between the light and heavy Bs mass eigenstates The weak phase (ϕs) stems from the interference between direct Bs meson decays into a CP eigenstate and decays through mixing to the same J/ψφ final state Phys.Lett. B757 (2016) 97-120 Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Motivation The weak phase ϕs is related to the elements of the CKM matrix ϕs ≅ -2βs ( ) (Neglecting penguin contribution) (SM prediction global fit) Any deviation of measured value as a hint for physics beyond SM The theoretical prediction for ΔΓs =0.087 ±0.021 ps-1 (Assuming no new physics Bs mixing) Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Analysis strategy Bs  J/ψ (μ+μ-) φ(K+K-) Decay topology (θT,ψT,ϕT) The azimuthal angle of the μ+ in the rest frame of J/ψ helicity angle ψT is the angle of the K+ in the φ(1020) rest frame with respect to the negative J/ψmomentum direction The polar angle of the μ+ in the rest frame of J/ψ Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Signal Reconstruction 19.7 fb-1 , 8 TeV Data μPT > 4.0 GeV, PT (μμ) > 6.9 GeV, |η| < 2.1 Distance of closet approach of μ+μ- (3D) < 0.5 cm and have common vertex. The transverse decay length significance (Lxy/σLxy) > 3.0 Lxy is the distance between the primary and secondary vertices in the transverse plane and σxy is the uncertainty. The vertex fit probability > 10% |M(μ+μ− ) – MJ/ψ (PDG)| < 150 MeV. Cosine of angle between transverse momentum and Lxy >0.9 Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Signal Reconstruction 19.7 fb-1 , 8 TeV Data PT (Kaon) > 0.7 GeV |M(K+K− ) – Mφ (PDG)| < 10 MeV. 5.20 GeV < Mass (Bs) > 5.65 GeV Vertex probability greater than 2%. At least one primary vertex. In case of multiple vertices, the one which minimizes the angle between the flight direction and the momentum of the Bs is select. Non prompt J/ψ (Bc, Λb B0,B±) contribution is negligible. PYTHIA (V6.424)/EVTGEN for MC Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Reconstructed Bs Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Signal selection Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Flavor tagging The charge of lepton from other Bs decay gives the flavor of signal Bs at production time. The power of tagging Ptag = εtag ( 1 − 2 ω)2 , where εtag is the efficiency of tagging, ω is the mistag fraction. PT ( tag lepton)> 2.2 GeV. The distance (3D) from primary vertex of Bs < 0.1cm Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Mis – Tag Probability (ω) Tagging Efficiency: 8.3% (data) Combined mistag probability Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Maximum likelihood fit Fit is performed using, invariant mass Bs, proper decay time (ct), three decay angles, proper decay length uncertainty (σ ct) Total events in the fit 70,500 ( 5650 tagged event) Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Angular Distribution from Data Dr. Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Results Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Systematic Uncertainties Ralatively large statistical uncertainties Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Results Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR Insert a photo Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Conclusions ϕs measurement is consistent with SM fit prediction ΔΓs is measured to be non zero Uncertainties on ϕs and ΔΓs measurement are dominated by statistical uncertainties. Look forward to use 13 TeV data for improved measurement! Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR

Thank You Dr. Prafulla Kumar Behera, IIT Madras CKM2016 workshop@TIFR