2011/12/05 by Georg Krocker, Krocker, Georg
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.48550/arxiv.1112.0868
Proceedings for PIC 2011, Vancouver
arxiv created 2011/12/05 · openalex publication_date 2011/12/05 · arxiv updated 2011/12/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The determination of the CP-violating phase ϕs in B0s → J/ψϕ decays is one of the key goals of the LHCb experiment. Its value is predicted to be very small in the Standard Model but can be significantly enhanced in many models of new physics. An angular analysis of the decay \PBs→\PJpsi\Pphi using about 340\invpicobarn of data is presented resulting in a Standard Model compatible value of ϕs\PJpsi\Pphi=0.13±0.18(stat.)±0.07(syst.) rad. An additional extraction of ϕs from the decay \PBs→\PJpsi f0(980) is performed for the first time in LHCb. A combination results in ϕs=0.05±0.17(stat.)±0.07(syst.) rad. To resolve the fast mixing frequency is an essential prerequisite of this analysis. This is demonstrated by a precision measurement of Δms=17.725±0.041(stat.)±0.026(syst.)\ps-1.