@article{3160788,
    title = "Measurement of associated W plus charm production in pp collisions at
root s=7 TeV",
    author = "Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and and Adam, W. and Bergauer, T. and Dragicevic, M. and Eroe, J. and and Fabjan, C. and Friedl, M. and Fruehwirth, R. and Ghete, V. M. and and Hoermann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and and Knuenz, V. and Krammer, M. and Kraetschmer, I. and Liko, D. and Mikulec, and I. and Rabady, D. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and and Schoefbeck, R. and Strauss, J. and Taurok, A. and and Treberer-Treberspurg, W. and Waltenberger, W. and Wulz, C. -E. and and Mossolov, V. and Shumeiko, N. and Gonzalez, J. Suarez and Alderweireldt, and S. and Bansal, M. and Bansal, S. and Cornelis, T. and De Wolf, E. A. and and Janssen, X. and Knutsson, A. and Luyckx, S. and Mucibello, L. and and Ochesanu, S. and Roland, B. and Rougny, R. and Staykova, Z. and Van and Haevermaet, H. and Van Mechelen, P. and Van Remortel, N. and Van and Spilbeeck, A. and Blekman, F. and Blyweert, S. and D'Hondt, J. and and Kalogeropoulos, A. and Keaveney, J. and Maes, M. and Olbrechts, A. and and Tavernier, S. and Van Doninck, W. and Van Mulders, P. and Van Onsem, G. and P. and Villella, I. and Caillol, C. and Clerbaux, B. and De Lentdecker, and G. and Favart, L. and Gay, A. P. R. and Hreus, T. and Leonard, A. and and Marage, P. E. and Mohammadi, A. and Pernie, L. and Reis, T. and Seva, T. and and Thomas, L. and Vander Velde, C. and Vanlaer, P. and Wang, J. and and Adler, V. and Beernaert, K. and Benucci, L. and Cimmino, A. and and Costantini, S. and Dildick, S. and Garcia, G. and Klein, B. and and Lellouch, J. and Marinov, A. and Mccartin, J. and Rios, A. A. Ocampo and and Ryckbosch, D. and Sigamani, M. and Strobbe, N. and Thyssen, F. and and Tytgat, M. and Walsh, S. and Yazgan, E. and Zaganidis, N. and Basegmez, and S. and Beluffi, C. and Bruno, G. and Castello, R. and Caudron, A. and and Ceard, L. and Da Silveira, G. G. and Delaere, C. and du Pree, T. and and Favart, D. and Forthomme, L. and Giammanco, A. and Hollar, J. and Jez, and P. and Lemaitre, V. and Liao, J. and Militaru, O. and Nuttens, C. and and Pagano, D. and Pin, A. and Piotrzkowski, K. and Popov, A. and Selvaggi, and M. and Marono, M. Vidal and Garcia, J. M. Vizan and Beliy, N. and and Caebergs, T. and Daubie, E. and Hammad, G. H. and Alves, G. A. and and Correa Martins Junior, M. and Martins, T. and Pol, M. E. and Souza, M. and H. G. and Alda Junior, W. L. and Carvalho, W. and Chinellato, J. and and Custodio, A. and Da Costa, E. 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    journal = "Journal of High Energy Physics",
    year = "2014",
    number = "2",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP02(2014)013",
    keywords = "Hadron-Hadron Scattering",
    abstract = "Measurements are presented of the associated production of a W boson and
a charm-quark jet (W + c) in pp collisions at a center-of-mass energy of
7 TeV. The analysis is conducted with a data sample corresponding to a
total integrated luminosity of 5 fb(-1), collected by the CMS detector
at the LHC. W boson candidates are identified by their decay into a
charged lepton (muon or electron) and a neutrino. The W + c measurements
are performed for charm-quark jets in the kinematic region p(T)(jet) >
25 GeV, vertical bar eta(jet)vertical bar < 2.5, for two different
thresholds for the transverse momentum of the lepton from the W-boson
decay, and in the pseudorapidity range eta(l) < 2.1. Hadronic and
inclusive semileptonic decays of charm hadrons are used to measure the
following total cross sections: sigma(pp -> W + c + X) x B (W -> lv) =
107.7 +/- 3.3 (stat.) +/- 6.9 (syst.) pb (p(T)(l) > 25 GeV) and sigma
(pp -> W + c + X) x B (W -> lv) = 84.1 +/- 2.0 (stat.) +/- 4.9 (syst.)
pb (p(T)(l) > 35 GeV), and the cross section ratios sigma(pp -> W+ + (c)
over bar + X)/sigma(pp -> W- + c + X) = 0.954 +/- 0.025 (stat.) +/-
0.004 (syst.) (p(T)(l) > 25 GeV) and sigma(pp -> W+ + (c) over bar +
X)/sigma(pp -> W- + c + X) = 0.938 +/- 0.019 (stat.) +/- 0.006 (syst.)
(p(T)(l) > 35 GeV). Cross sections and cross section ratios are also
measured differentially with respect to the absolute value of the
pseudorapidity of the lepton from the W-boson decay. These are the first
measurements from the LHC directly sensitive to the strange quark and
antiquark content of the proton. Results are compared with theoretical
predictions and are consistent with the predictions based on global fits
of parton distribution functions."
}