Measurements of inclusive W and Z cross sections in pp collisions at ps = 7 TeV

40 páginas, 8 figuras, 5 tablas.-- Open Access: This article is distributed under the terms of the Creative Commons\ud
Attribution Noncommercial License.-- CMS Collaboration: et al.Measurements of inclusive W and Z boson production cross sections in pp\ud
collisions at ps = 7 TeV are presented, based on 2:9 pb1 of data recorded by the CMS\ud
detector at the LHC. The measurements, performed in the electron and muon decay channels,\ud
are combined to give  (pp ! WX) B(W ! ` ) = 9:95 0:07 (stat.) 0:28 (syst.) \ud
1:09 (lumi.) nb and  (pp ! ZX)   B(Z ! `+`) = 0:931   0:026 (stat.)   0:023 (syst.)  \ud
0:102 (lumi.) nb, where ` stands for either e or  . Theoretical predictions, calculated at\ud
the next-to-next-to-leading order in QCD using recent parton distribution functions, are\ud
in agreement with the measured cross sections. Ratios of cross sections, which incur an\ud
experimental systematic uncertainty of less than 4%, are also reported.This work was supported by the Austrian Federal\ud
Ministry of Science and Research; the Belgium Fonds de la Recherche Scienti que, and\ud
Fonds voor Wetenschappelijk Onderzoek; the Brazilian Funding Agencies (CNPq, CAPES,\ud
FAPERJ, and FAPESP); the Bulgarian Ministry of Education and Science; CERN; the Chinese\ud
Academy of Sciences, Ministry of Science and Technology, and National Natural Science\ud
Foundation of China; the Colombian Funding Agency (COLCIENCIAS); the Croatian\ud
Ministry of Science, Education and Sport; the Research Promotion Foundation, Cyprus;\ud
the Estonian Academy of Sciences and NICPB; the Academy of Finland, Finnish Ministry\ud
of Education, and Helsinki Institute of Physics; the Institut National de Physique Nucléaire\ud
et de Physique des Particules / CNRS, and Commissariat a l'Énergie Atomique, France;\ud
the Bundesministerium für Bildung und Forschung, Deutsche Forschungsgemeinschaft, and\ud
Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germa-ny; the General Secretariat\ud
for Research and Technology, Greece; the National Scienti c Research Foundation, and\ud
National O ce for Research and Technology, Hungary; the Department of Atomic Energy,\ud
and Department of Science and Technology, India; the Institute for Studies in Theoretical\ud
Physics and Mathematics, Iran; the Science Foundation, Ireland; the Istituto Nazionale di\ud
Fisica Nucleare, Italy; the Korean Ministry of Education, Science and Technology and the\ud
World Class University program of NRF, Korea; the Lithuanian Academy of Sciences; the\ud
Mexican Funding Agencies (CINVESTAV, CONACYT, SEP, and UASLP-FAI); the Pakistan\ud
Atomic Energy Commission; the State Commission for Scienti c Research, Poland;\ud
the Fundaçâo para a Ciência e a Tecnologia, Portugal; JINR (Armenia, Belarus, Georgia,\ud
Ukraine, Uzbekistan); the Ministry of Science and Technologies of the Russian Federation,\ud
and Russian Ministry of Atomic Energy; the Ministry of Science and Technological\ud
Development of Serbia; the Ministerio de Ciencia e Innovación, and Programa Consolider-\ud
Ingenio 2010, Spain; the Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF,\ud
UniZH, Canton Zurich, and SER); the National Science Council, Taipei; the Scienti c and\ud
Technical Research Council of Turkey, and Turkish Atomic Energy Authority; the Science\ud
and Technology Facilities Council, U.K.; the US Department of Energy, and the US\ud
National Science Foundation.\ud
Individuals have received support from the Marie-Curie programme and the European\ud
Research Council (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Associazione per lo Sviluppo Scienti co e\ud
Tecnologico del Piemonte (Italy); the Belgian Federal Science Policy Office; the Fonds pour\ud
la Formation à la Recherche dans l'Industrie et dans l'Ágriculture (FRIA-Belgium); and\ud
the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium).Peer reviewe