Search for CP Violation in the Phase Space of $$ {d}^0\to {k}_s^0{k}^{\pm }{\pi}^{\mp } $$ Decays with the Energy Test

R. Aaij,Ahmed Sameh Wagih Abdelmotteleb， Quan Zou, F. Zetti

Journal of High Energy Physics（2024）SCI 2区SCI 1区

Cited 0|Views13

Abstract

A bstract A search for CP violation in

D^{0} \to K_{S}^{0} K^{+} π^{-}

D 0 → K S 0 K + π − and

D^{0} \to K_{S}^{0} K^{-} π^{+}

D 0 → K S 0 K − π + decays is reported. The search is performed using an unbinned model-independent method known as the energy test that probes local CP violation in the phase space of the decays. The data analysed correspond to an integrated luminosity of 5 . 4 fb − 1 collected in proton-proton collisions by the LHCb experiment at a centre-of-mass energy of

\sqrt{s}

s = 13 TeV, amounting to approximately 950 thousand and 620 thousand signal candidates for the

D^{0} \to K_{S}^{0} K^{-} π^{+}

D 0 → K S 0 K − π + and

D^{0} \to K_{S}^{0} K^{+} π^{-}

D 0 → K S 0 K + π − modes, respectively. The method is validated using D 0 → K − π + π − π + and

D^{0} \to K_{S}^{0} π^{+} π^{-}

D 0 → K S 0 π + π − decays, where CP -violating effects are expected to be negligible, and using background-enhanced regions of the signal decays. The results are consistent with CP symmetry in both the

D^{0} \to K_{S}^{0} K^{-} π^{+}

D 0 → K S 0 K − π + and the

D^{0} \to K_{S}^{0} K^{+} π^{-}

D 0 → K S 0 K + π − decays, with p -values for the hypothesis of no CP violation of 70% and 66%, respectively.

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【要点】：本研究通过能量测试方法在 $$ {D}^0\to {K}_S^0{K}^{\pm }{\pi}^{\mp } $$ 衰变相空间中寻找CP对称性破坏，实验结果未发现CP违反现象。
【方法】：采用未装箱的模型独立方法——能量测试，探索衰变相空间中的局部CP对称性破坏。
【实验】：使用LHCb实验在质子-质子对撞中收集的5.4 fb^-1积分亮度数据，对 $$ {D}^0\to {K}_S^0{K}^{-}{\pi}^{+} $$ 和 $$ {D}^0\to {K}_S^0{K}^{+}{\pi}^{-} $$ 衰变模式进行分析，实验结果与CP对称性一致，p值分别为70%和66%。

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