Updated measurement of CP violation and polarisation in $$ {B}_s^0\to J/\psi {\overline{K}}^{\ast }{(892)}^0 $$ decays Article Swipe
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1007/jhep10(2025)173
A bstract A time-integrated angular analysis of the decay $$ {B}_s^0\to J/\psi {\overline{K}}^{\ast }{(892)}^0 $$ , with J / ψ → μ + μ − and $$ {\overline{K}}^{\ast }{(892)}^0\to {K}^{-}{\pi}^{+} $$ , is presented. The analysis employs a sample of proton-proton collision data collected by the LHCb experiment during 2015–2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb − 1 . A simultaneous maximum-likelihood fit is performed to the angular distributions in bins of the K − π + mass. This fit yields measurements of the CP -averaged polarisation fractions and CP asymmetries for the P-wave component of the K − π + system. The longitudinal and parallel polarisation fractions are determined to be f 0 = 0.534 ± 0.012 ± 0.009 and f || = 0.211 ± 0.014 ± 0.005, respectively, where the first uncertainty is statistical and the second is systematic. The CP asymmetries are measured with 3–7% precision and are found to be consistent with zero. These measurements, along with an updated determination of the branching fraction relative to the B 0 → J / ψK *0 decay, are combined with previous LHCb results, providing the most precise values for these observables to date.
Related Topics To Compare & Contrast
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1007/jhep10(2025)173
- OA Status
- diamond
- OpenAlex ID
- https://openalex.org/W4414855136