Measurement of the W-> lv and Z/gamma*-> ll production cross sections

G Aad, B Abbott,J Abdallah,AA Abdelalim,A Abdesselam,O Abdinov,B Abi, M Abolins, H Abramowicz, H Abreu,E Acerbi,BS Acharya, M Ackers,DL Adams, TN Addy,J Adelman,M Aderholz, S Adomeit,C Adorisio, P Adragna,T Adye, S Aefsky,JA Aguilar-Saavedra, M Aharrouche,SP Ahlen, F Ahles,A Ahmad,H Ahmed,M Ahsan, G Aielli,T Akdogan,TPA Akesson, G Akimoto,AV Akimov,A Aktas,MS Alam,MA Alam, S Albrand,M Aleksa, IN Aleksandrov, M Aleppo, F Alessandria,C Alexa, G Alexander,G Alexandre,T Alexopoulos,M Alhroob, M Aliev, G Alimonti, J Alison,M Aliyev,PP Allport, SE Allwood-Spiers,J Almond,A Aloisio, R Alon, A Alonso,J Alonso,MG Alviggi, K Amako, P Amaral,G Ambrosio,C Amelung,VV Ammosov,A Amorim, G Amoros, N Amram, C Anastopoulos, T Andeen, CF Anders,KJ Anderson,A Andreazza, V Andrei,ML Andrieux,XS Anduaga, A Angerami, F Anghinolfi, N Anjos,A Annovi, A Antonaki,M Antonelli, S Antonelli,J Antos,B Antunovic,F Anulli, S Aoun, R Apolle,G Arabidze, I Aracena,Y Arai, ATH Arce,JP Archambault, S Arfaoui,JF Arguin, T Argyropoulos,E Arik,M Arik, AJ Armbruster,KE Arms,SR Armstrong, O Arnaez, C Arnault,A Artamonov,D Arutinov,M Asai,S Asai,R Asfandiyarov, S Ask, B Asman, D Asner,L Asquith, K Assamagan, A Astbury, A Astvatsatourov, G Atoian,B Aubert, B Auerbach, E Auge, K Augsten, M Aurousseau,N Austin, G Avolio, R Avramidou, D Axen, C Ay, G Azuelos, Y Azuma,MA Baak,G Baccaglioni, C Bacci,AM Bach, H Bachacou, K Bachas, G Bachy,M Backes, E Badescu, P Bagnaia,Y Bai,DC Bailey, T Bain, JT Baines,OK Baker,MD Baker,S Baker, F Pedrosa, E Banas,P Banerjee,Sw Banerjee, D Banfi, A Bangert

user-5ebe3bbdd0b15254d6c50b2c（2013）

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摘要

First measurements of the W -> lv and Z/gamma* -> ll (l = e; mu) production cross sections in proton-proton collisions at root s = 7 TeV are presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W -> lv 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) center dot BR(W -> lv) = 9.96 +/- 0.23(stat) +/- 0.50(syst) +/- 1.10(lumi) nb and sigma(tot)(Z) center dot BR(Z/gamma* -> ll) = 0.82 +/- 0.06 (stat) +/- 0.05 (syst) +/- 0.09 (lumi) nb (within the invariant mass window 66 < m(ll) < 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 …

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