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

First observation of CP violation in the decays of B(s)0 mesons.
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DOI:
10.1103/physrevlett.110.221601
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发表时间:
2013-04
影响因子:
8.6
通讯作者:
R. Aaij;C. Abellán Beteta;B. Adeva;M. Adinolfi;C. Adrover;A. Affolder;Z. Ajaltouni;J. Albrecht-
R. Aaij;C. Abellán Beteta;B. Adeva;M. Adinolfi;C. Adrover;A. Affolder;Z. Ajaltouni;J. Albrecht-
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
R. Aaij;C. Abellán Beteta;B. Adeva;M. Adinolfi;C. Adrover;A. Affolder;Z. Ajaltouni;J. Albrecht-

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利用LHC B在2011年收集的质心能量为7 TeV、积分光度为1.0 fb(-1)的pp碰撞数据,我们测量了B(s)(0)→K(-)π(+)的直接CP破坏,A(CP)(B(s)(0)→ K(-)π(+)=0.27±0.04(stat)±0.01(syst),显著性超过5个标准差.这是在B(s)(0)介子衰变中首次观察到CP破坏。此外,我们还改进了B(0)→K(+)π(-)衰变中CP直接破坏的测定,A(CP)(B(0)→K(+)π(-))=-0.080 <$0.007(stat)±0.003(syst),这是迄今为止对这个量最精确的测量.
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.