Determination of the Sign of the Decay Width Difference in the B0s System

doi:https://doi.org/10.1103/PhysRevLett.108.241801

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RECERCAT Home > Universitat Ramon Llull > La Salle > Articles publicats a revistes científiques > View document

Use this identifier to quote or link this document: http://hdl.handle.net/2072/375993

dc.contributor	Universitat Ramon Llull. La Salle
dc.contributor	CERN
dc.contributor.author	Calvo Gómez, Míriam
dc.contributor.author	Camboni, Alessandro
dc.contributor.author	Vilasís Cardona, Xavier
dc.contributor.author	LHCb Collaboration - CERN
dc.date.accessioned	2020-06-02T13:41:34Z
dc.date.available	2020-06-02T13:41:34Z
dc.date.created	2012
dc.date.issued	2012-06-11
dc.identifier.uri	http://hdl.handle.net/2072/375993
dc.format.extent	7 p.
dc.language.iso	eng
dc.publisher	American Physical Society
dc.relation.ispartof	Physical Review Letters, 2012, Vol. 108, No. 24 (Juny)
dc.rights	L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights	© CERN
dc.source	RECERCAT (Dipòsit de la Recerca de Catalunya)
dc.subject.other	Gran col·lisionador d'hadrons (França i Suïssa)
dc.subject.other	Partícules (Física nuclear)
dc.title	Determination of the Sign of the Decay Width Difference in the B0s System
dc.type	info:eu-repo/semantics/article
dc.type	info:eu-repo/semantics/publishedVersion
dc.subject.udc	53 - Física
dc.embargo.terms	cap
dc.identifier.doi	https://doi.org/10.1103/PhysRevLett.108.241801
dc.rights.accessLevel	info:eu-repo/semantics/openAccess
dc.description.abstract	The interference between the K+K− S-wave and P-wave amplitudes in B0s→J/ψK+K− decays with the K+K− pairs in the region around the ϕ(1020) resonance is used to determine the variation of the difference of the strong phase between these amplitudes as a function of K+K− invariant mass. Combined with the results from our CP asymmetry measurement in B0s→J/ψϕ decays, we conclude that the B0s mass eigenstate that is almost CP=+1 is lighter and decays faster than the mass eigenstate that is almost CP=−1. This determines the sign of the decay width difference ΔΓs≡ΓL−ΓH to be positive. Our result also resolves the ambiguity in the past measurements of the CP violating phase ϕs to be close to zero rather than π. These conclusions are in agreement with the standard model expectations.

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