Benvenuti nell'Anagrafe della Ricerca d'Ateneo
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.
EnglishFirst 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.
| 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: | |
| Data di pubblicazione: | 2010 |
| Rivista: | |
| 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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