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Measurement of the CP-violating phase ϕs from Bs0→J/ψπ+π decays in 13 TeV pp collisions

MPS-Authors
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Schmelling,  M.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Zavertiaev,  M.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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1903.05530.pdf
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Citation

LHCb Collaboration, Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C. A., et al. (2019). Measurement of the CP-violating phase ϕs from Bs0→J/ψπ+π decays in 13 TeV pp collisions. Physics Letters B, 797: 134789. doi:10.1016/j.physletb.2019.07.036.


Cite as: https://hdl.handle.net/21.11116/0000-0004-F910-1
Abstract
Decays of $B_{s}^{0}$ and $\overline{B}{}_{s}^{0}$ mesons into
$J/\psi\pi^+\pi^-$ final states are studied in a data sample corresponding to
1.9 fb$^{-1}$ of integrated luminosity collected with the LHCb detector in 13
TeV $pp$ collisions. A time-dependent amplitude analysis is used to determine
the final-state resonance contributions, the $CP$-violating phase
$\phi_s=-0.057\pm 0.060\pm 0.011$ rad, the decay-width difference between the
heavier mass $B_{s}^{0}$ eigenstate and the $B^{0}$ meson of $-0.050\pm
0.004\pm 0.004$ ps$^{-1}$, and the $CP$-violating parameter
$|\lambda|=1.01_{-0.06}^{+0.08}\pm0.03$, where the first uncertainty is
statistical and the second systematic. These results are combined with previous
LHCb measurements in the same decay channel using 7 TeV and 8 TeV $pp$
collisions obtaining $\phi_s =0.002\pm0.044\pm0.012$ rad, and $|\lambda|
=0.949\pm0.036\pm0.019$.