COSMOVIA - Virtual Institute of Astroparticle Physics /IN THE NEWS /THE NEWEST RESULT: FIRST OBSERVATION OF CP VIOLATION IN THE DECAYS OF Bs MESONS.

Credits

LHCb COLLABORATION: R. Aaij, C. Abellan Beteta, B. Adeva, M.
Adinolfi,
    C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M.
Alexander,
    S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves Jr, S. Amato,
S. Amerio,
    Y. Amhis, L. Anderlini, J. Anderson, R. Andreassen, R.B. Appleby, O. Aquines
    Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma,
    S. Bachmann, J.J. Back, C. Baesso, V. Balagura, W. Baldini, R.J. Barlow, C.
    Barschel, S. Barsuk, W. Barter, Th. Bauer, A. Bay, J. Beddow, F.
Bedeschi, I.
    Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, G. Bencivenni, S.
    Benson, J. Benton, A. Berezhnoy, R. Bernet, M.-O. Bettler, M. van Beuzekom,
    A. Bien, S. Bifani, T. Bird, A. Bizzeti, P.M. Bj\ornstad, T. Blake,
F. Blanc,
    J. Blouw, S. Blusk, V. Bocci, A. Bondar, et al. (570 additional authors not
    shown)

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First observation of CP violation in the decays of Bs mesons.

April, 23, 2013

Using pp collision data, corresponding to an integrated luminosity of $1.0 \mathrm{fb}^{-1}$, collected by LHCb in 2011

Using pp collision data, corresponding to an integrated luminosity of $1.0 \mathrm{fb}^{-1}$, collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in $B^0_s \to K^-\pi^+$ decays, $A_{C/!P}(B^0_s \rightarrow K^- \pi^+)=0.27 \pm 0.04\,\mathrm{(stat)} \pm 0.01\,\mathrm{(syst)}$, with significance exceeding five standard deviations.

This is the first observation of CP violation in the decays of $B^0_s$ mesons. Furthermore, we provide an improved determination of direct CP violation in $B^0 \to K^+\pi^-$ decays, $A_{C/!P}(B^0\rightarrow K^+ \pi^-)=-0.080 \pm 0.007\,\mathrm{(stat)} \pm 0.003\,\mathrm{(syst)}$, which is the most precise measurement of this quantity to date. \\ ( http://arxiv.org/abs/1304.6173 , 912kb)