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Abstract: Pair production of Y(1S) mesons is observed at the LHC in proton-proton collisions at s=8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb?1. Both Y(1S) candidates are fully reconstructed via their decays to ?+??. The fiducial acceptance region is defined by an absolute Y(1S) rapidity smaller than 2.0. The fiducial cross section for the production of Y(1S) pairs, assuming that both mesons decay isotropically, is measured to be 68.8±12.7 (stat)±7.4 (syst)±2.8 (?) pb, where the third uncertainty comes from the uncertainty in the branching fraction of Y(1S) decays to ?+??. Assuming instead that the Y(1S) mesons are produced with different polarizations leads to variations in the measured cross section in the range from ?38% to +36%.
Fuente: Journal of High Energy Physics Vol. 2017, Iss. 05, Art. Num. 013
Publisher: Springer Verlag
Publication date: 01/05/2017
No. of pages: 34
Publication type: Article
DOI: 10.1007/JHEP05(2017)013
ISSN: 1126-6708,1029-8479
Publication Url: https://doi.org/10.1007/JHEP05(2017)013
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KHACHATRYAN, VLADIMIR
JOSE IBAN CABRILLO BARTOLOME
ALICIA CALDERON TAZON
JUAN RAMON CASTIÑEIRAS DE SAA
ESTEBAN CURRAS RIVERA
MARCOS FERNANDEZ GARCIA
JUAN GARCIA FERRERO
GERVASIO GOMEZ GRAMUGLIO
MARIA AMPARO LOPEZ VIRTO
JESUS MARCO DE LUCAS
CELSO MARTINEZ RIVERO
FRANCISCO MATORRAS WEINIG
JONATAN PIEDRA GOMEZ
MARIA TERESA RODRIGO ANORO
ALBERTO RUIZ JIMENO
LUCA SCODELLARO
NICOLO TREVISANI
IVAN VILA ALVAREZ
ROCIO VILAR CORTABITARTE
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