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Measurement of the CP-violating phase ϕs in →¯Bos → D+s D-s

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

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

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Fontana,  Marianna
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Popov,  Dmitry
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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

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Volyanskyy,  Dmytro
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Voss,  H.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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1409.4619.pdf
(Preprint), 516KB

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Citation

LHCb Collaboration, Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Affolder, A., et al. (2014). Measurement of the CP-violating phase ϕs in →¯Bos → D+s D-s. Physical Review Letters, 113(21): 211801. doi:10.1103/PhysRevLett.113.211801.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-6C92-A
Abstract
We present a measurement of the $CP$-violating weak mixing phase $\phi_s$
using the decay $\bar{B}^{0}_{s}\to D_{s}^{+}D_{s}^{-}$ in a data sample
corresponding to $3.0$ fb$^{-1}$ of integrated luminosity collected with the
LHCb detector in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. An
analysis of the time evolution of the system, which does not constrain
$|\lambda|=1$ to allow for the presence of $CP$ violation in decay, yields
$\phi_s = 0.02 \pm 0.17$ (stat) $\pm 0.02$ (syst) rad, $|\lambda| =
0.91^{+0.18}_{-0.15}$ (stat) $\pm0.02$ (syst). This result is consistent with
the Standard Model expectation.