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Search for the CP -violating strong decays η → π + π − and η ′ (958)→ π + π −
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1-s2.0-S0370269316306955-main.pdf
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894.73 KB
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Checksum (MD5)
9ee63d485df9553999c65493d4a4432e
Journal
Physics Letters B
Publisher
Elsevier BV
Citation
Aaij, R., B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, et al. “Search for the CP -Violating Strong Decays η → π + π − and η ′ (958)→ π + π −.” Physics Letters B 764 (January 2017): 233–240. doi:10.1016/j.physletb.2016.11.032.
Version
Final published version
Abstract
© 2016 The Author 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 Ds+→π+π+π−, 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 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−)<1.6×10−5and 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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Creative Commons Attribution 4.0 International License
Attribution 4.0 International
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DOI of Published Version
http://dx.doi.org/10.1016/J.PHYSLETB.2016.11.032
