Measurement of the CKM angle ? and $$ {B}_s^0\hbox{-} {\overline{B}}_s^0 $$ mixing frequency with $$ {B}_s^0\to {D}_s^{\mp }{h}^{\pm }{\pi}^{\pm }{\pi}^{\mp } $$ decays
Measurement of the CKM angle ? and $$ {B}_s^0\hbox{-} {\overline{B}}_s^0 $$ mixing frequency with $$ {B}_s^0\to {D}_s^{\mp }{h}^{\pm }{\pi}^{\pm }{\pi}^{\mp } $$ decays
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CKM 角的测量 ?
DOI：
10.1007/jhep03(2021)137
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发表时间：
2021
影响因子：
5.4
通讯作者：
Aaij R
中科院分区：
文献类型：
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作者：
Aaij R
CKM角γ首次从混合诱导的CP破坏和衰变之间测量到，这些衰变是在质子-质子碰撞数据中重建的，对应于用LHCb探测器记录的积分光度9FB−1。用含时振幅分析方法提取了破坏CP的弱相位γ−2βS，并以混频相位γS为外部输入，提取了β。测量得到γ=(44±12)模180，其中结合了统计和系统的不确定度。另一种与模型无关的测量，在衰变的五维相空间上积分，得到模数180。此外，从香料特有的控制通道测得振荡频率为∆m S=(17.757±0.007(统计)±0。008(系统))ps−1，与当前世界平均值一致，且比当前世界平均值更精确。
The CKM angle γ is measured for the first time from mixing-induced CP violation betweenanddecays reconstructed in proton-proton collision data corresponding to an integrated luminosity of 9 fb− 1 recorded with the LHCb detector. A time-dependent amplitude analysis is performed to extract the CP-violating weak phase γ− 2β s and, subsequently, γ by taking themixing phase β s as an external input. The measurement yields γ=(44±12) modulo 180, where statistical and systematic uncertainties are combined. An alternative model-independent measurement, integrating over the five-dimensional phase space of the decay, yieldsmodulo 180. Moreover, theoscillation frequency is measured from the flavour-specific control channelto be∆ m s=(17. 757±0. 007 (stat)±0. 008 (syst)) ps− 1, consistent with and more precise than the current world-average value.