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Search for the CP-violating strong decays η → π+π and η(958)→an style='font-style: italic'>π+π
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文摘
A search for the CP  -violating strong decays η&rarr;π+π−η&rarr;π+π− and η′(958)&rarr;π+π−η′(958)&rarr;π+π− has been performed using approximately 2.5×1072.5×107 events of each of the decays D+&rarr;π+π+π−D+&rarr;π+π+π− and Ds+&rarr;π+π+π−, 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 D(s)+&rarr;π+η(′) with η(′)&rarr;π+π−η(′)&rarr;π+π−, and upper limits at 90% confidence level are set on the branching fractions, B(η&rarr;π+π−)<1.6×10−5B(η&rarr;π+π−)<1.6×10−5 and B(η′&rarr;π+π−)<1.8×10−5B(η′&rarr;π+π−)<1.8×10−5. The limit for the η   decay is comparable with the existing one, while that for the η′η′ is a factor of three smaller than the previous limit.

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