Flavor tagged time-dependent angular analysis of the B0s → J/ψϕ decay and extraction of ΔΓs and the weak phase ϕs in ATLAS

Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Salvatore, F, Santoyo Castillo, I, Suruliz, K, Sutton, M R, Vivarelli, I and The ATLAS Collaboration, (2014) Flavor tagged time-dependent angular analysis of the B0s → J/ψϕ decay and extraction of ΔΓs and the weak phase ϕs in ATLAS. Physical Review D, 90 (5). 052007. ISSN 2470-0010

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Abstract

A measurement of the B0s→J/ψϕ decay parameters, updated to include flavor tagging is reported using 4.9  fb−¹ of integrated luminosity collected by the ATLAS detector from √s=7  TeV pp collisions recorded in 2011 at the LHC. The values measured for the physical parameters are

ϕs=0.12±0.25(stat)±0.05(syst)  rad
ΔΓs=0.053±0.021(stat)±0.010(syst)  ps−¹
Γs=0.677±0.007(stat)±0.004(syst)  ps−¹
|A∥(0)|2=0.220±0.008(stat)±0.009(syst)
|A0(0)|2=0.529±0.006(stat)±0.012(syst)
δ⊥=3.89±0.47(stat)±0.11(syst)  rad

where the parameter ΔΓs is constrained to be positive. The S-wave contribution was measured and found to be compatible with zero. Results for ϕs and ΔΓs are also presented as 68% and 95% likelihood contours, which show agreement with the Standard Model expectations.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Billy Wichaidit
Date Deposited: 02 May 2017 12:56
Last Modified: 02 May 2017 16:07
URI: http://sro.sussex.ac.uk/id/eprint/67605

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Project NameSussex Project NumberFunderFunder Ref
ATLASG0275STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/I006048/1