A search for the CP-violating strong decays η → π+π- and η′(958) → π+π- has been performed using approximately 2.5 × 107 events 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-1 of pp collision data recorded during LHC Run 1 and 0.3 fb-1 recorded 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.
LHCb searches for the strong CP-violating decays η → ππ and η′ → ππ
Capriotti L
2017
Abstract
A search for the CP-violating strong decays η → π+π- and η′(958) → π+π- has been performed using approximately 2.5 × 107 events 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-1 of pp collision data recorded during LHC Run 1 and 0.3 fb-1 recorded 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.
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