LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Brossa Gonzalo, A., Costa Sobral, C. M., Crocombe, Andrew, Gershon, T. J., Kreps, Michal, Latham, Thomas, Loh, David, Lupton, Oliver, Mathad, A., Millard, E., Poluektov, Anton and Wicht, Jean). (2019) Observation of the doubly Cabibbo-suppressed decay Ξ+c → pφ. Journal of High Energy Physics, 2019 . 84. doi:10.1007/JHEP04(2019)084 ISSN 1029-8479.

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Abstract

The doubly Cabibbo-suppressed decay Ξ +c → pϕ with ϕ → K+K− is observed for the first time, with a statistical significance of more than fifteen standard deviations. The data sample used in this analysis corresponds to an integrated luminosity of 2 fb−1 recorded with the LHCb detector in pp collisions at a centre-of-mass energy of 8 TeV. The ratio of branching fractions between the decay Ξ +c → pϕ and the singly Cabibbo-suppressed decay Ξ +c → pK−π+ is measured to be

B(Ξ+c→pϕ)B(Ξ+c→pK−π+)=(19.8±0.7±0.9±0.2)×10−3,
where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the ϕ → K+K− branching fraction.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Journal of High Energy Physics
Publisher:	Springer
ISSN:	1029-8479
Official Date:	10 April 2019
Dates:	Date Event 10 April 2019 Published 7 April 2019 Accepted
Volume:	2019
Article Number:	84
DOI:	10.1007/JHEP04(2019)084
Institution:	University of Warwick
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Related URLs:	Publisher Other Repository
Open Access Version:	ArXiv
Contributors:	Contribution Name Contributor ID Research Group LHCb Collaboration, UNSPECIFIED

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