A measurement is presented of the tt¯ production cross section (σtt¯) in proton-proton collisions at a centre-of-mass energy of 7 TeV, in the all-jet final state that contains at least six jets, two of which are tagged as originating from b quarks. The data correspond to an integrated luminosity of 3.54 fb−1, collected with the CMS detector at the LHC. The cross section is determined through an unbinned maximum likelihood fit of background and tt¯ signal to the reconstructed mass spectrum of tt¯ candidates in the data, in which events are subjected to a kinematic fit assuming a tt¯→W+bW−b¯¯¯→6 jets hypothesis. The measurement yields σtt¯=139±10(stat.)±26(syst.)±3(lum.)pb, a result consistent with those obtained in other tt¯ decay channels, as well as with predictions of the standard model.

Measurement of the t(t)over-bar production cross section in the all-jet final state in pp collisions at √s=7 TeV

L. Bianchini;MARTINI, LUCA;MESSINEO, ALBERTO MARIA;RIZZI, ANDREA;TONELLI, GUIDO EMILIO;A. C. Marini;
2013-01-01

Abstract

A measurement is presented of the tt¯ production cross section (σtt¯) in proton-proton collisions at a centre-of-mass energy of 7 TeV, in the all-jet final state that contains at least six jets, two of which are tagged as originating from b quarks. The data correspond to an integrated luminosity of 3.54 fb−1, collected with the CMS detector at the LHC. The cross section is determined through an unbinned maximum likelihood fit of background and tt¯ signal to the reconstructed mass spectrum of tt¯ candidates in the data, in which events are subjected to a kinematic fit assuming a tt¯→W+bW−b¯¯¯→6 jets hypothesis. The measurement yields σtt¯=139±10(stat.)±26(syst.)±3(lum.)pb, a result consistent with those obtained in other tt¯ decay channels, as well as with predictions of the standard model.
2013
Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Aguilo, E.; Bergauer, T.; Dragicevic, M.; Eroe, J.; Fabjan, C.; Friedl, M.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/581715
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