Measurement of the CP-violating phase φs and the B⁰s meson decay width difference with B⁰s → J/ψφ decays in ATLAS

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurement of the CP-violating phase φs and the B⁰s meson decay width difference with B⁰s → J/ψφ decays in ATLAS. Journal of High Energy Physics, 2016(8) Springer 10.1007/JHEP08(2016)147

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A measurement of the B0s decay parameters in the B0s →J/ψϕ channel using an integrated luminosity of 14.3 fb⁻¹ collected by the ATLAS detector from 8 TeV pp collisions at the LHC is presented. The measured parameters include the CP -violating phase ϕs , the decay width Γ s and the width difference between the mass eigenstates ΔΓs. The values measured for the physical parameters are statistically combined with those from 4.9 fb⁻¹ of 7 TeV data, leading to the following: ϕ s = −0.090±0.078(stat.)±0.041(syst.)rad ΔΓs = 0.085±0.011(stat.)±0.007(syst.)ps⁻¹ Γ s = 0.675±0.003(stat.)±0.003(syst.)ps⁻¹. In the analysis the parameter ΔΓs is constrained to be positive. Results for ϕs and ΔΓs are also presented as 68% and 95% likelihood contours in the ϕs−ΔΓs plane. Also measured in this decay channel are the transversity amplitudes and corresponding strong phases. All measurements are in agreement with the Standard Model predictions.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Haug, Sigve; Weber, Michael and Beck, Hans Peter

Subjects:

500 Science > 530 Physics
500 Science > 510 Mathematics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

11 Aug 2017 15:12

Last Modified:

13 Aug 2017 02:16

Publisher DOI:

10.1007/JHEP08(2016)147

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.99984

URI:

https://boris.unibe.ch/id/eprint/99984

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