Inclusive W and Z production in the forward region at $ \sqrt {s} = 7\,{\text{TeV}}

A bstract Measurements of inclusive W and Z boson production cross-sections in pp collisions at $ \sqrt {s} = 7\,{\text{TeV}} $ using final states containing muons are presented. The data sample corresponds to an integrated luminosity of 37 pb −1 collected with the LHCb detector. The W and Z bosons...

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Published in:The journal of high energy physics 2012-06, Vol.2012 (6), Article 58
Main Authors: Adrover, C., Ajaltouni, Z., Alessio, F., Anderson, J., Aquines Gutierrez, O., Barsuk, S., Barter, W., Bay, A., Bediaga, I., Benson, S., Benton, J., Bondar, A., Brook, N. H., Büchler-Germann, A., Cardini, A., Clemencic, M., Contu, A., Deckenhoff, M., Dickens, J., Egorychev, V., Elsasser, Ch, Elsby, D., Fernandez Albor, V., Francisco, O., Gallas Torreira, A., Garra Tico, J., Golubkov, D., Gomes, A., Graciani Diaz, R., Harnew, N., He, J., Hunt, P., Jansen, F., Jean-Marie, B., Kaballo, M., Khanji, B., Knecht, M., Korolev, M., Krocker, G., Kvaratskheliya, T., Lai, A., Lambert, R. W., Lanfranchi, G., Latham, T., Lefrançois, J., Leroy, O., Li, L., Gioi, L. Li, Lieng, M., Liu, G., Lopes, J. H., Lopez-March, N., Lu, H., Luisier, J., Milanes, D. A., Minard, M.-N., Mountain, R., Müller, K., Nikitin, N., Oldeman, R., Pal, B. K., Patel, G. D., Pepe Altarelli, M., Perego, D. L., Pérez-Calero Yzquierdo, A., Perrin-Terrin, M., Pietrzyk, B., Poluektov, A., Prisciandaro, J., Qian, W., Rademacker, J. H., Rangel, M. S., Robbe, P., Rodriguez Perez, P., Rogers, G. J., Rosello, M., Santacesaria, R., Santovetti, E., Satta, A., Schlupp, M., Sepp, I., Seyfert, P., Shekhtman, L., Smith, E., Sobczak, K., Storaci, B., Straumann, U., Szczypka, P., Thomas, C., Ubeda Garcia, M., Vazquez Gomez, R., Vollhardt, A., Voß, C., Waldi, R., Ward, D. R., Wilkinson, G., Williams, M. P., Wilson, F. F., Yushchenko, O., Zhong, L.
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Language:English
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Summary:A bstract Measurements of inclusive W and Z boson production cross-sections in pp collisions at $ \sqrt {s} = 7\,{\text{TeV}} $ using final states containing muons are presented. The data sample corresponds to an integrated luminosity of 37 pb −1 collected with the LHCb detector. The W and Z bosons are reconstructed from muons with a transverse momentum above 20 GeV/c and pseudorapidity between 2 . 0 and 4 . 5, and, in the case of the Z cross-section, a dimuon invariant mass between 60 and 120 GeV/c 2 . The cross-sections are measured to be 831 ± 9 ± 27 ± 29pb for W + , 656 ± 8 ± 19 ± 23 for W − and 76 . 7 ± 1 . 7 ± 3 . 3 ± 2 . 7pb for Z , where the first uncertainty is statistical, the second is systematic and the third is due to the luminosity. Differential cross-sections, W and Z cross-section ratios and the lepton charge asymmetry are also measured in the same kinematic region. The ratios are determined to be $ {\sigma_{{{W^{ + }} \to {\mu^{ + }}\nu }}}/{\sigma_{{{W^{ - }} \to {\mu^{ - }}\overline \nu }}} = 1.27\pm 0.02\pm 0.01 $ and $ \left( {{\sigma_{{{W^{ + }} \to {\mu^{ + }}\nu }}} + {\sigma_{{{W^{ - }} \to {\mu^{ - }}\overline \nu }}} \right)/{\sigma_{{Z \to \mu \mu }}} = 19.4\pm 0.5\pm 0.9 $ . The results are in general agreement with theoretical predictions, performed at next-to-next-to-leading order in QCD using recently calculated parton distribution functions.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP06(2012)058