Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays B<SUP>+</SUP> → J/ψπ<SUP>+</SUP> and B<SUP>+</SUP> → J/ψK<SUP>+</SUP>



Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G
et al (show 762 more authors) (2017) Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays B<SUP>+</SUP> → J/ψπ<SUP>+</SUP> and B<SUP>+</SUP> → J/ψK<SUP>+</SUP>. JOURNAL OF HIGH ENERGY PHYSICS, 2017 (3). 36-.

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Abstract

The ratio of branching fractions and the difference in $CP$ asymmetries of the decays $B^+\to J/\psi \pi^+$ and $B^+\to J/\psi K^+$ are measured using a data sample of $pp$ collisions collected by the LHCb experiment, corresponding to an integrated luminosity of $3~{{\,\mbox{fb}^{-1}}}$ at centre-of-mass energies of 7 and $8~\mathrm{\,Te\kern -0.1em V}$. The results are \begin{equation*} {\mathcal{B}(B^+\to J/\psi \pi^+)\over\mathcal{B}(B^+\to J/\psi K^+)}=(3.83\pm0.03\pm0.03)\times10^{-2}\,, \end{equation*} \begin{equation*} \mathcal{A}^{CP}(B^+\to J/\psi \pi^+)-\mathcal{A}^{CP}(B^+\to J/\psi K^+)=(1.82\pm0.86\pm0.14)\times10^{-2}, \end{equation*} where the first uncertainties are statistical and the second are systematic. Combining this result with a recent LHCb measurement of $\mathcal{A}^{CP}(B^+\to J/\psi K^+)$ provides the most precise estimate to date of $CP$ violation in the decay $B^+\to J/\psi \pi^+$, \begin{equation*} \mathcal{A}^{CP}(B^+\to J/\psi \pi^+) =(1.91\pm0.89\pm0.16)\times10^{-2}. \end{equation*}

Item Type: Article
Additional Information: 16 pages, 10 figures. All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-051.html
Uncontrolled Keywords: B physics, Branching fraction, CP violation, Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 08 Jan 2019 14:43
Last Modified: 14 Mar 2024 23:44
DOI: 10.1007/JHEP03(2017)036
Open Access URL: https://doi.org/10.1007/JHEP03(2017)036
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3030993