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Search for the CP-violating strong decays η sp>→ sp>π<sup>+sup>π<sup>−sup> and η<sup>′sup>(958)→<span style='font-style: italic'>π<sup>+sup>π<sup>−sup>
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文摘
A search for the CP  -violating strong decays η→π+π&minus;η→π+π&minus; and η′(958)→π+π&minus;η′(958)→π+π&minus; has been performed using approximately 2.5&times;1072.5&times;107 events of each of the decays D+→π+π+π&minus;D+→π+π+π&minus; and Ds+→π+π+π&minus;, recorded by the LHCb experiment. The data set corresponds to an integrated luminosity of 3.0&thinsp;fb&minus;1 of pp collision data recorded during LHC Run 1 and 0.3&thinsp;fb&minus;1 recorded in Run 2. No evidence is seen for D(s)+→π+η(′) with η(′)→π+π&minus;η(′)→π+π&minus;, and upper limits at 90% confidence level are set on the branching fractions, B(η→π+π&minus;)<1.6&times;10&minus;5B(η→π+π&minus;)<1.6&times;10&minus;5 and B(η′→π+π&minus;)<1.8&times;10&minus;5B(η′→π+π&minus;)<1.8&times;10&minus;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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