dc.contributor |
Universitat Ramon Llull. La Salle |
dc.contributor |
CERN |
dc.contributor.author |
LHCb Collaboration - CERN |
dc.contributor.author |
Calvo Gómez, Míriam |
dc.contributor.author |
Golobardes, Elisabet |
dc.contributor.author |
Vilasís Cardona, Xavier |
dc.date.accessioned |
2021-07-26T12:49:41Z |
dc.date.available |
2021-07-26T12:49:41Z |
dc.date.issued |
2021-03 |
dc.identifier.uri |
http://hdl.handle.net/2072/450455 |
dc.format.extent |
43 p. |
dc.language.iso |
eng |
dc.publisher |
Springer |
dc.relation.ispartof |
Journal of High Energy Physics, 2021, No. 75 |
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/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 |
Interaccions d'hadrons |
dc.subject.other |
Protons |
dc.subject.other |
Partícules (Física nuclear) |
dc.title |
Observation of CP violation in two-body B0(s) -meson decays to charged pions and kaons |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/publishedVersion |
dc.subject.udc |
539 - Constitució física de la matèria |
dc.embargo.terms |
cap |
dc.rights.accessLevel |
info:eu-repo/semantics/openAccess |
dc.description.abstract |
The time-dependent CP asymmetries of B0 → π+π− and B0s → K+K− decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are:
ππ=−0.311±0.045±0.015
Sππ=−0.706±0.042±0.013
CKK=0.123±0.034±0.015
SKK=0.164±0.034±0.014
AΔΓKK=−0.83±0.05±0.09
where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B0 → K + π− and B0s → K−π+ decays and the results are:
B0CP=−0.0824±0.0033±0.0033
AB0sCP=0.236±0.013±0.011
All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in B0s decays. |