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Measurement of CP violation in B0s→ϕϕ decays
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Langenbruch, Christoph, Latham, Thomas, O'Hanlon, Daniel P., Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte and Whitehead, M. (Mark)). (2014) Measurement of CP violation in B0s→ϕϕ decays. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 90 (Number 5). Article number 052011 . doi:10.1103/PhysRevD.90.052011
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WRAP_PhysRevD.90.052011.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution. Download (711Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevD.90.052011
Abstract
A measurement of the decay time-dependent CP-violating asymmetry in B0s→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 B0s−B¯0s mixing and the loop-induced decay amplitude. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 3.0 fb−1 collected with the LHCb detector, a signal yield of approximately 4000 B0s→ϕϕ decays is obtained. The CP-violating phase is measured to be ϕs=−0.17±0.15(stat)±0.03(syst) rad. The triple-product asymmetries are measured to be AU=−0.003±0.017(stat)±0.006(syst) and AV=−0.017±0.017(stat)±0.006(syst). Results are consistent with the hypothesis of CP conservation.
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