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Measurement of CP violation in $B_{s}^{0}→ϕϕ$ decays


LHCb Collaboration; Bernet, Roland; Müller, Katharina; Steinkamp, Olaf; Straumann, Ulrich; Serra, Nicola; Vollhardt, Achim; et al (2014). Measurement of CP violation in $B_{s}^{0}→ϕϕ$ decays. Physical Review D (Particles, Fields, Gravitation and Cosmology), 90:052011.

Abstract

A measurement of the decay time dependent $CP$-violating asymmetry in $B_{s}^{0} →ϕϕ$ decays is presented, along with measurements of the $T$-odd triple-product asymmetries. In this decay channel, the CP-violating weak phase arises from the interference between $B_{s}^{0}-\bar B_{s}^{0}$ mixing and the loop-induced decay amplitude. Using a sample of proton-proton collision data corresponding to an integrated luminosity of $3.0fb^{−1}$ collected with the LHCb detector, a signal yield of approximately 4000 $B_{s}^{0}→ϕϕ$ decays is obtained. The $CP$-violating phase is measured to be $ϕ_{s}=−0.17±0.15(stat)±0.03(syst) rad$. The triple-product asymmetries are measured to be $A_{U}=−0.003±0.017(stat)±0.006(syst)$ and $A_{V}=−0.017±0.017(stat)±0.006(syst)$. Results are consistent with the hypothesis of $CP$ conservation.

Abstract

A measurement of the decay time dependent $CP$-violating asymmetry in $B_{s}^{0} →ϕϕ$ decays is presented, along with measurements of the $T$-odd triple-product asymmetries. In this decay channel, the CP-violating weak phase arises from the interference between $B_{s}^{0}-\bar B_{s}^{0}$ mixing and the loop-induced decay amplitude. Using a sample of proton-proton collision data corresponding to an integrated luminosity of $3.0fb^{−1}$ collected with the LHCb detector, a signal yield of approximately 4000 $B_{s}^{0}→ϕϕ$ decays is obtained. The $CP$-violating phase is measured to be $ϕ_{s}=−0.17±0.15(stat)±0.03(syst) rad$. The triple-product asymmetries are measured to be $A_{U}=−0.003±0.017(stat)±0.006(syst)$ and $A_{V}=−0.017±0.017(stat)±0.006(syst)$. Results are consistent with the hypothesis of $CP$ conservation.

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Additional indexing

Other titles:Measurement of CP violation in B0s→ϕϕ decays
Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2014
Deposited On:24 Feb 2015 09:31
Last Modified:09 Nov 2022 15:14
Publisher:American Physical Society
ISSN:1550-2368
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/PhysRevD.90.052011
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 3.0 Unported (CC BY 3.0)
  • Content: Accepted Version