Search for the CP-violating strong decays η→π+π− and η′(958)→π+π−

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 D+s→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)→π+η(′) with η(′)→π+π−, and upper limits at 90% confidence level are set on the branching fractions, B(η→π+π−)<1.6×10−5 and B(η′→π+π−)<1.8×10−5. 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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http://hal.in2p3.fr/in2p3-01381117
Contributor : Claudine Bombar <>
Submitted on : Friday, October 14, 2016 - 9:06:48 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Search for the CP-violating strong decays η→π+π− and η′(958)→π+π−. Physics Letters B, Elsevier, 2017, 764, pp.233-240. ⟨10.1016/j.physletb.2016.11.032⟩. ⟨in2p3-01381117⟩

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