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Measurement of spin correlations in tt production using the matrix element method in the muon+jets final state in pp collisions at ?s=8 TeV

Abstract: The consistency of the spin correlation strength in top quark pair production with the standard model (SM) prediction is tested in the muon+jets final state. The events are selected from pp collisions, collected by the CMS detector, at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The data are compared with the expectation for the spin correlation predicted by the SM and with the expectation of no correlation. Using a template fit method, the fraction of events that show SM spin correlations is measured to be 0.72±0.08(stat)+0.15 -0.13(syst), representing the most precise measurement of this quantity in the muon+jets final state to date.

 Fuente: Physics Letters B, Vol.758, Pp. 321?346 (2016)

 Editorial: Elsevier

 Fecha de publicación: 01/07/2016

 Nº de páginas: 26

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2016.05.005

 ISSN: 0370-2693,1873-2445

 Url de la publicación: https://doi.org/10.1016/j.physletb.2016.05.005

Autoría

KHACHATRYAN, VLADIMIR

JUAN RAMON CASTIÑEIRAS DE SAA

PABLO DE CASTRO MANZANO

MARCOS FERNANDEZ GARCIA

JUAN GARCIA FERRERO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO