The LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Crocombe, Andrew, Costa Sobral, Cayo, Gershon, T. J., Kreps, Michal, Latham, Thomas, Loh, David, Mathad, Abhijit , O'Hanlon, Daniel P., Poluektov, Anton, Wallace, Charlotte and Wicht, Jean). (2017) Search for the CP-violating strong decays η → π+π− and η′(958)→π+π−. Physics Letters B, 764 . pp. 233-240. doi:10.1016/j.physletb.2016.11.032 ISSN 0370-2693.

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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 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.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Physics Letters B
Publisher:	Elsevier Science BV
ISSN:	0370-2693
Official Date:	10 January 2017
Dates:	Date Event 10 January 2017 Published 23 November 2016 Available 17 November 2016 Accepted
Volume:	764
Page Range:	pp. 233-240
DOI:	10.1016/j.physletb.2016.11.032
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
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