, 2011:80,
Open Access This content is freely available online to anyone, anywhere at any time.
Date: 19 Jan 2011

Measurements of inclusive W and Z cross sections in pp collisions at \( \sqrt {s} = 7 \) TeV

Abstract

Measurements of inclusive W and Z boson production cross sections in pp collisions at \( \sqrt {s} = 7 \) TeV are presented, based on 2.9 pb−1 of data recorded by the CMS detector at the LHC. The measurements, performed in the electron and muon decay channels, are combined to give \( \sigma \left( {{\text{pp}} \to {\text{W}}X} \right) \times \mathcal{B}\left( {{\text{W}} \to \ell \nu } \right) = 9.95\pm 0.07\left( {{\text{stat}}{.}} \right)\pm 0.28\left( {{\text{syst}}{.}} \right)\pm 1.09 \) (lumi.) nb and \( \sigma \left( {{\text{pp}} \to {\text{Z}}X} \right) \times \mathcal{B}\left( {Z \to {\ell^{+} }{\ell^{-} }} \right) = 0.931\pm 0.026\left( {{\text{stat}}{.}} \right)\pm 0.023\left( {{\text{syst}}{.}} \right)\pm 0.102 \) (lumi.) nb, where ℓ stands for either e or μ. Theoretical predictions, calculated at the next-to-next-to-leading order in QCD using recent parton distribution functions, are in agreement with the measured cross sections. Ratios of cross sections, which incur an experimental systematic uncertainty of less than 4%, are also reported.

ArXiv ePrint:1012.2466
1: Also at CERN, European Organization for Nuclear Research, Geneva, Switzerland
2: Also at Universidade Federal do ABC, Santo Andre, Brazil
3: Also at Laboratoire Leprince-Ringuet, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France
4: Also at Suez Canal University, Suez, Egypt
5: Also at Fayoum University, El-Fayoum, Egypt
6: Also at Soltan Institute for Nuclear Studies, Warsaw, Poland
7: Also at Massachusetts Institute of Technology, Cambridge, USA
8: Also at Université de Haute-Alsace, Mulhouse, France
9: Also at Brandenburg University of Technology, Cottbus, Germany
10: Also at Moscow State University, Moscow, Russia
11: Also at Institute of Nuclear Research ATOMKI, Debrecen, Hungary
12: Also at Eötvös Loránd University, Budapest, Hungary
13: Also at Tata Institute of Fundamental Research -HECR, Mumbai, India
14: Also at University of Visva-Bharati, Santiniketan, India
15: Also at Facolta’ Ingegneria Università di Roma “La Sapienza”, Roma, Italy
16: Also at Università della Basilicata, Potenza, Italy
17: Also at Laboratori Nazionali di Legnaro dell’ INFN, Legnaro, Italy
18: Also at California Institute of Technology, Pasadena, USA
19: Also at Faculty of Physics of University of Belgrade, Belgrade, Serbia
20: Also at University of California, Los Angeles, Los Angeles, USA
21: Also at University of Florida, Gainesville, USA
22: Also at Université de Genève, Geneva, Switzerland
23: Also at Scuola Normale e Sezione dell’ INFN, Pisa, Italy
24: Also at INFN Sezione di Roma; Università di Roma “La Sapienza”, Roma, Italy
25: Also at University of Athens, Athens, Greece
26: Also at The University of Kansas, Lawrence, USA
27: Also at Institute for Theoretical and Experimental Physics, Moscow, Russia
28: Also at Paul Scherrer Institut, Villigen, Switzerland
29: Also at University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences, Belgrade, Serbia
30: Also at Adiyaman University, Adiyaman, Turkey
31: Also at Mersin University, Mersin, Turkey
32: Also at Izmir Institute of Technology, Izmir, Turkey
33: Also at Kafkas University, Kars, Turkey
34: Also at Suleyman Demirel University, Isparta, Turkey
35: Also at Ege University, Izmir, Turkey
36: Also at Rutherford Appleton Laboratory, Didcot, United Kingdom
37: Also at INFN Sezione di Perugia; Università di Perugia, Perugia, Italy
38: Also at KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary
39: Also at Institute for Nuclear Research, Moscow, Russia
40: Also at Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), Bucharest, Romania
41: Also at Istanbul Technical University, Istanbul, Turkey