A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets data sample recorded by the CMS experiment at the LHC in pp collisions at âs=7 TeV corresponding to an integrated luminosity of 5.0 fb-1. No significant deviations from the standard model background are observed. Upper limits are presented for the production cross section times branching fraction of top quark-antiquark resonances for masses from 750 to 3000 GeV. In particular, the existence of a leptophobic topcolor particle Zâ² is excluded at the 95% confidence level for resonance masses MZ â²<1.3 TeV for ÎZâ²=0.012MZ â², and M<1.9 TeV for ÎZâ²=0.10MZ â². © 2013 CERN.
Search for Zâ² resonances decaying to ttÌ in dilepton+jets final states in pp collisions at âs=7 TeV
ALBERGO, Sebastiano Francesco;CAPPELLO, GIGI;CHIORBOLI, MASSIMILIANO;COSTA, Salvatore;POTENZA, Renato Carlo;TRICOMI, Alessia Rita;TUVE', Cristina Natalina;
2013-01-01
Abstract
A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets data sample recorded by the CMS experiment at the LHC in pp collisions at âs=7 TeV corresponding to an integrated luminosity of 5.0 fb-1. No significant deviations from the standard model background are observed. Upper limits are presented for the production cross section times branching fraction of top quark-antiquark resonances for masses from 750 to 3000 GeV. In particular, the existence of a leptophobic topcolor particle Zâ² is excluded at the 95% confidence level for resonance masses MZ â²<1.3 TeV for ÎZâ²=0.012MZ â², and M<1.9 TeV for ÎZâ²=0.10MZ â². © 2013 CERN.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.