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.

Search for the CP-violating strong decays η → π+π−and η'(958)→π+π− / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 764:(2017), pp. 233-240. [10.1016/j.physletb.2016.11.032]

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

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
2017

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.
2017
B physics Charm physics Hadron-Hadron scattering (experiments) QCD Spectroscopy
01 Pubblicazione su rivista::01a Articolo in rivista
Search for the CP-violating strong decays η → π+π−and η'(958)→π+π− / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 764:(2017), pp. 233-240. [10.1016/j.physletb.2016.11.032]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1074537
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