LHCb searches for the strong CP-violating decays η → ππ and η' → ππ

10th International Conference on Kaon Physics

Capriotti, L.^1

School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester

M13 9PL, United Kingdom^1

关键词: Branching fractions;    Confidence levels;    Data set;    Integrated luminosity;    Pp collisions;    Upper limits;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/800/1/012002/pdf
DOI  :  10.1088/1742-6596/800/1/012002

来源: IOP

【 摘 要 】

A search for the CP-violating strong decays η → π+π-and η′(958) → π+π-has been performed using approximately 2.5 × 107events of each of the decays D+→ π+π+π-and , recorded by the LHCb experiment. The data set corresponds to an integrated luminosity of 3.0 fb-1of pp collision data recorded during LHC Run 1 and 0.3 fb-1recorded in Run 2. No evidence is seen for with η(′)→ π+π-and upper limits at 90% confidence level are set on the branching fractions, and . The limit for the η decay is comparable with the existing one, while that for the η′ is a factor of three smaller than the previous limit.