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Phys Rev Lett. 2013 May 31;110(22):221601. Epub 2013 May 30.

First observation of CP violation in the decays of B(s)0 mesons.

Aaij R, Abellan Beteta C, Adeva B, Adinolfi M, Adrover C, Affolder A, Ajaltouni Z, Albrecht J, Alessio F, Alexander M, Ali S, Alkhazov G, Alvarez Cartelle P, Alves AA Jr, Amato S, Amerio S, Amhis Y, Anderlini L, Anderson J, Andreassen R, Appleby RB, Aquines Gutierrez O, Archilli F, Artamonov A, Artuso M, Aslanides E, Auriemma G, Bachmann S, Back JJ, Baesso C, Balagura V, Baldini W, Barlow RJ, Barschel C, Barsuk S, Barter W, Bauer T, Bay A, Beddow J, Bedeschi F, Bediaga I, Belogurov S, Belous K, Belyaev I, Ben-Haim E, Bencivenni G, Benson S, Benton J, Berezhnoy A, Bernet R, Bettler MO, van Beuzekom M, Bien A, Bifani S, Bird T, Bizzeti A, Bjørnstad PM, Blake T, Blanc F, Blouw J, Blusk S, Bocci V, Bondar A, Bondar N, Bonivento W, Borghi S, Borgia A, Bowcock TJ, Bowen E, Bozzi C, Brambach T, van den Brand J, Bressieux J, Brett D, Britsch M, Britton T, Brook NH, Brown H, Burducea I, Bursche A, Busetto G, Buytaert J, Cadeddu S, Callot O, Calvi M, Calvo Gomez M, Camboni A, Campana P, Campora 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Abstract

Using pp collision data corresponding to an integrated luminosity of 1.0 fb(-1) and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in B(s)(0)→K(-)π(+) decays, A(CP)(B(s)(0)→K(-)π(+)=0.27±0.04 (stat)±0.01 (syst), with significance exceeding 5 standard deviations. This is the first observation of CP violation in the decays of B(s)(0) mesons. Furthermore, we provide an improved determination of direct CP violation in B(0)→K(+)π(-) decays, A(CP)(B(0)→K(+)π(-)=-0.080±0.007 (stat)±0.003 (syst), which is the most precise measurement of this quantity to date.

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