Measurement of the W -> lnu and Z/gamma* -> ll production cross sections in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector

Atlas, Collaboration; Petrucci, Fabrizio; Orestano, Domizia

doi:10.1007/JHEP12(2010)06

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La valutazione delle attività di ricerca che si svolgono nelle università ha assunto un'importanza rilevante sia per l'intero sistema universitario sia all'interno di ogni singolo ateneo. Roma Tre si è quindi dotata di idonei strumenti informativi in grado di supportare al meglio le azioni di monitoraggio e di valutazione delle attività di ricerca svolte nei propri dipartimentied ha realizzato una Anagrafe della Ricerca di Ateneo.

First measurements of the W->lnu and Z/gamma(*)->ll (l=e,mu ) production cross sections in proton-proton collisions at sqrt(s) = 7TeV are presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W->lnu and 179 Z/gamma(*)->ll candidate events selected from a data set corresponding to an integrated luminosity of approximately 320 nb-1. The measured total W and Z/gamma(*)-boson production cross sections times the respective leptonic branching ratios for the combined electron and muon channels are sigma^tot_W x BR(W->lnu) = 9.96+-0.23(stat)+-0.50(syst)+-1.10(lumi) nb and sigma^tot_Z/gamma(*) x BR(Z/gamma(*)->ll) = 0.82+-0.06 (stat)+-0.05 (syst)+-0.09 (lumi) nb (within the invariant mass window 66 < mll < 116 GeV). The W/Z cross-section ratio is measured to be 11.7+-0.9(stat)+-0.4(syst). In addition, measurements of the W+ and W- production cross sections and of the lepton charge asymmetry are reported. Theoretical predictions based on NNLO QCD calculations are found to agree with the measurements.

ATLAS Collaboration (G.Aad et al.), & Petrucci F (2010). Measurement of the W -> lnu and Z/gamma* -> ll production cross sections in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS(12).

Titolo:	Measurement of the W -> lnu and Z/gamma* -> ll production cross sections in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
Autori:	ATLAS Collaboration PETRUCCI, FABRIZIO ORESTANO, DOMIZIA mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2010
Rivista:	JOURNAL OF HIGH ENERGY PHYSICS
Citazione:	ATLAS Collaboration (G.Aad et al.), & Petrucci F (2010). Measurement of the W -> lnu and Z/gamma* -> ll production cross sections in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS(12).
Abstract:	First measurements of the W->lnu and Z/gamma()->ll (l=e,mu ) production cross sections in proton-proton collisions at sqrt(s) = 7TeV are presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W->lnu and 179 Z/gamma()->ll candidate events selected from a data set corresponding to an integrated luminosity of approximately 320 nb-1. The measured total W and Z/gamma()-boson production cross sections times the respective leptonic branching ratios for the combined electron and muon channels are sigma^tot_W x BR(W->lnu) = 9.96+-0.23(stat)+-0.50(syst)+-1.10(lumi) nb and sigma^tot_Z/gamma() x BR(Z/gamma(*)->ll) = 0.82+-0.06 (stat)+-0.05 (syst)+-0.09 (lumi) nb (within the invariant mass window 66 < mll < 116 GeV). The W/Z cross-section ratio is measured to be 11.7+-0.9(stat)+-0.4(syst). In addition, measurements of the W+ and W- production cross sections and of the lepton charge asymmetry are reported. Theoretical predictions based on NNLO QCD calculations are found to agree with the measurements.
Handle:	http://hdl.handle.net/11590/134260
Appare nelle tipologie:	1.1 Articolo in rivista

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