论文标题
搜索直接$ cp $违反充电的无魅力$ b \ to pv $衰减
Search for direct $CP$ violation in charged charmless $B \to PV$ decays
论文作者
论文摘要
提出了$ cp $不对称的$ CP $不对称$ B \至PV $衰减，其中$ p $和$ v $分别表示伪cal和vector Meson。五个不同的$ b \ to pv $从四个最终状态中衰减，$ b^\ pm \ toπ^\pmπ^+π^ - $，$ b^\ pm \ to k^\pmπ^+π^+π^ - $，$ b^\ pm \ to k^+ pm k^+ k^+ k^+ k^ - $ k^ - $ and $ b^ - $ and $ b^ - $ k^$ k.测量结果基于不需要完整振幅分析的方法，并使用质子 - 蛋白质碰撞数据在2015年至2018年之间由LHCB收集的13 TEV的质子质子碰撞数据进行，对应于5.9 fb $^{ - 1} $的综合发光度。在$π^ +π^ - $ $ \ textit {p} $ - wave中，在由$ b^\ pm \ toρ（770）^0 k^\ pm $ decay主导的区域中第一个不确定性是统计，第二个是系统的。这是在此过程中首次观察$ cp $违规。对于其他四个衰减通道，在$ b^\ pm \ toρ（770）^0π^\ pm $，$ b^\ pm \ to \ to \ oftset {（ - ）} {k^*}（k^*}（892）^0π^\ pm $，$ b^\ pm pm \ to \ to）的区域中， k^\ pm $和$ b^\ pm \ to ϕ（1020）k^\ pm $衰减，$ cp $ symmetries在$ \ textit {p} $ - wave与零兼容。
Measurements of $CP$ asymmetry in charmless $B\to PV$ decays are presented, where $P$ and $V$ denote a pseudoscalar and a vector meson, respectively. Five different $B\to PV$ decays from four final states, $B^\pm \to π^\pm π^+ π^-$, $B^\pm \to K^\pm π^+ π^-$, $B^\pm \to K^\pm K^+ K^-$ and $B^\pm \to π^\pm K^+ K^-$ are analyzed. The measurements are based on a method that does not require full amplitude analyses, and are performed using proton-proton collision data at a center-of-mass energy of 13 TeV collected by LHCb between 2015 and 2018, corresponding to an integrated luminosity of 5.9 fb$^{-1}$. In the $π^+ π^-$ $\textit{P}$-wave, in the region dominated by the $B^\pm \to ρ(770)^0 K^\pm$ decay, a $CP$ asymmetry of $\mbox{$A_{CP}$ = +0.150 $\pm$ 0.019 $\pm$ 0.011}$ is measured, where the first uncertainty is statistical and the second is systematic. This is the first observation of $CP$ violation in this process. For the other four decay channels, in regions dominated by the $B^\pm \to ρ(770)^0 π^\pm$, $B^\pm \to \overset{(-)}{K^*}(892)^0 π^\pm$, $B^\pm \to \overset{(-)}{K^*}(892)^0 K^\pm$ and $B^\pm \to ϕ(1020) K^\pm$ decays, $CP$ asymmetries in the $\textit{P}$-wave compatible with zero are measured.
