论文标题
$ d_s^+ \toπ^-π^+π^+ $衰减的振幅分析
Amplitude analysis of the $D_s^+ \to π^- π^+ π^+$ decay
论文作者
论文摘要
提出了$ d_s^+ \至π^ - π^+π^+ $衰减的Dalitz图分析。该分析基于LHCB实验记录的Proton-Proton碰撞数据以$ 8 $ TEV的中心能量为中心，对应于$ 1.5 fb^{ - 1} $的集成光度。衰减的谐振结构是使用与准模型无关的部分波分析获得的，其中$π^+π^ - $ s波振幅被参数化为由数据拟合确定的通用复杂函数。发现S波分量占主导地位，其次是Spin-2共振的贡献，而Spin-1共振的贡献很小。后者包括$ d_s^+ \ toω（782）π^+ $通道的第一个观察结果，$ d_s^+ \toπ^ - π^+π^+ $衰减。比较了$ d_s^+ \至π^ - π^+π^+ $和$ d^+ \ toπ^ - π^+π^+ $衰减的共振结构，提供了有关这些衰变中黑子队形成机制的信息。
A Dalitz plot analysis of the $D_s^+ \to π^- π^+ π^+$ decay is presented. The analysis is based on proton-proton collision data recorded by the LHCb experiment at a centre-of-mass energy of $8$ TeV and corresponding to an integrated luminosity of $1.5 fb^{-1}$. The resonant structure of the decay is obtained using a quasi-model-independent partial-wave analysis, in which the $π^+π^-$ S-wave amplitude is parameterised as a generic complex function determined by a fit to the data. The S-wave component is found to be dominant, followed by the contribution from spin-2 resonances and a small contribution from spin-1 resonances. The latter includes the first observation of the $D_s^+ \to ω(782) π^+$ channel in the $D_s^+ \to π^- π^+ π^+$ decay. The resonant structures of the $D_s^+ \to π^- π^+ π^+$ and $D^+ \to π^- π^+ π^+$ decays are compared, providing information about the mechanisms for the hadron formation in these decays.
