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

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, G. Andreassi, M. AndreottiJ. E. Andrews, R. B. Appleby, F. Archilli, P. d'Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, I. Babuschkin, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, S. Baker, W. Baldini, S. Bifani, G. Chatzikonstantinidis, N. Farley, P. Griffith, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, L. Pescatore, A. Sergi, N. K. Watson, M. P. Williams, T. Williams, K. A. Zarebski

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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 Ds +→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.

Original languageEnglish
Pages (from-to)233-240
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume764
Early online date23 Nov 2016
DOIs
Publication statusPublished - 10 Jan 2017

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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