Tellarini, G. (2015) Time-dependent measurement of the γ angle in the B0s → D±s K∓ decay at LHCb. Il nuovo cimento C, 38 (2). pp. 1-7. ISSN 1826-9885
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Abstract
This document describes the measurement of the weak phase γ in the B0s → D±s K∓ decay performed by the LHCb experiment. The γ angle is the worst measured among the CKM unitarity triangle angles. The B0s → D±s K∓ mode allows to measure γ in a very clean way since it decays through tree-level diagram avoiding the problem of the penguin pollution. The analysis is performed on the 2011 data sample collected by LHCb at the center of mass energy of 7TeV, which corresponds to an integrated luminosity of 1 fb −1. The relevant observables to be measured through the decay time dependence are the CP-violating coefficients Cf , Sf , S ¯ f , AΔΓ f , AΔΓ¯ f since they depend on the γ angle. We find the CP observables to be: Cf = 0.53±0.25±0.04, Sf = −1.09±0.33±0.08, S ¯ f = −0.36±0.34±0.08, AΔΓ f = 0.37 ± 0.42 ± 0.20, AΔΓ¯ f = 0.20 ± 0.41 ± 0.20, where the uncertainties are statistical and systematic, respectively. We use these observables to perform the first measurement of γ in the B0s → D±s K∓ decay mode, finding γ = (115+28−43)◦ modulo 180◦ at 68% CL where both the statistical and systematic uncertainties are included.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Storage rings and colliders ; Other topics in elementary-particle and nuclear physics experimental methods and instrumentation (restricted to new topics in section 29) |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 27 May 2020 15:33 |
| Last Modified: | 27 May 2020 15:33 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/19039 |
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