使用风味未标记的$B^0_s\rightarrow \tilde{D}^{(*)0}ϕ$衰变研究CKM角PDMATHAAB灵敏度
Study of CKM angle $γ$ sensitivity using flavor untagged $B^0_s\rightarrow \tilde{D}^{(*)0}ϕ$ decays
摘要：
用$D$介子在准味特异性模$Kπ$、$K3π$、$Kππ^0$和\CP -本征模$KK$和$ππ$中重构，对从$B^0_s\rightarrow \tilde{D}^{(*)0}ϕ$衰变中测量CKM角$γ$的灵敏度进行了研究，其中$\tilde{D}^0$表示$D^0$或${\tilde{D}^0}$介子. LHCb实验作为一个用例。从2011年到2018年LHCb实验收集的$pp$碰撞数据可以实现大约$8-19^{\circ}$的统计不确定性。到2025年积累23个$pp$碰撞数据后，对$γ$的灵敏度应为$3-8^{\circ}$量级，而到2030年后半期，预计$^{-1}$将达到300~fb，灵敏度将进一步提高。精确度取决于强参数$r^{(*)}_{B}$和${δ^{(*)}_{B}}$，它们与$γ$一起描述了$B^0_s\rightarrow \tilde{D}^{(*)0}ϕ$衰变的前导振幅之间的干扰。
英文摘要：
A sensitivity study for the measurement of the CKM angle $γ$ from $B^0_s\rightarrow \tilde{D}^{(*)0}ϕ$ decays is performed using $D$ meson reconstructed in the quasi flavour-specific modes $Kπ$, $K3π$, $Kππ^0$, and \CP-eigenstate modes $KK$ and $ππ$, where the notation $\tilde{D}^0$ corresponds to a $D^0$ or a ${\tilde{D}^0}$ meson. The LHCb experiment is taken as a use case. A statistical uncertainty of about $8-19^{\circ}$ can be achieved with the $pp$ collision data collected by the LHCb experiment from year 2011 to 2018. The sensitivity to $γ$ should be of the order $3-8^{\circ}$ after accumulating 23\invfb of $pp$ collision data by 2025, while it is expected to further improve with 300~fb$^{-1}$ by the second half of the 2030 decade. The accuracy depends on the strong parameters $r^{(*)}_{B}$ and ${δ^{(*)}_{B}}$, describing, together with $γ$, the interference between the leading amplitudes of the $B^0_s\rightarrow \tilde{D}^{(*)0}ϕ$ decays.
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