First observation of the decays B(0) ? D(+)K(-)p(+)p(-) and B(-) ? D(0)K(-)p(+)p(-).

First observation of the decays B(0) ? D(+)K(-)p(+)p(-) and B(-) ? D(0)K(-)p(+)p(-).
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第一次观察到衰变 B(0) ?

DOI:
10.1103/physrevlett.108.161801
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发表时间:
2012
影响因子:
8.6
通讯作者:
Aaij R
Aaij R
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Aaij R

文献摘要

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利用LHCb探测器收集的数据,首次观测到了Cabibbo抑制的衰变。它们的分支分数相对于相应的Cabibbo青睐的衰变进行测量,从中我们得到<?format ?> B(B 0→D+K-π+π-)/B(B 0→D+π-π+π-)=(5.9±1.1±0.5)×10-2,<?format ?> B(B-→ D 0 K-π+π-)/B(B-→ D 0 π-π+π-)=(9.4±1.3±0.9)×10-2,其中不确定度分别为统计不确定度和系统不确定度。衰变是特别有趣的,因为它可以用类似的方式来测量Cabibbo-Kobayashi-Maskawa相位。
First observations of the Cabibbo-suppressed decaysandare reported usingof data collected with the LHCb detector. Their branching fractions are measured with respect to the corresponding Cabibbo-favored decays, from which we obtain <?format ?>B(B¯0→D+K-π+π-)/B(B¯0→D+π-π+π-)=(5.9±1.1±0.5)×10-2 and <?format ?>B(B-→D0K-π+π-)/B(B-→D0π-π+π-)=(9.4±1.3±0.9)×10-2, where the uncertainties are statistical and systematic, respectively. Thedecay is particularly interesting, as it can be used in a similar way toto measure the Cabibbo-Kobayashi-Maskawa phase.