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.

Autore Pugliese

• De Filippis Nicola , Iaselli Giuseppe , Maggi Giorgio Pietro , Pugliese Gabriella Maria Incoronata

Tutti gli autori

• Chatrchyan S , Khachatryan V , Sirunyan AM , Tumasyan A , Adam W , Bergauer T , Dragicevic M , Ero J , Fabjan C , Friedl M , Fruhwirth R , Ghete VM , Hormann N , Hrubec J , Jeitler M , Kiesenhofer W , Knunz V , Krammer M , Kratschmer I , Liko D , Mikulec I , Rabady D , Rahbaran B , Rohringer C , Rohringer H , Schofbeck R , Strauss J , Taurok A , Treberer-Treberspurg W , Waltenberger W , Wulz CE , Mossolov V , Shumeiko N , Gonzalez JS , Alderweireldt S , Bansal M , Bansal S , Cornelis T , De Wolf EA , Janssen X , Knutsson A , Luyckx S , Mucibello L , Ochesanu S , Roland B , Rougny R , Staykova Z , Van Haevermaet H , Van Mechelen P , Van Remortel N , Van Spilbeeck A , Blekman F , Blyweert S , D'Hondt J , Kalogeropoulos A , Keaveney J , Maes M , Olbrechts A , Tavernier S , Van Doninck W , Van Mulders P , Van Onsem GP , Villella I , Caillol C , Clerbaux B , De Lentdecker G , Favart L , Gay APR , Hreus T , Leonard A , Marage PE , Mohammadi A , Pernie L , Reis T , Seva T , Thomas L , Vander Velde C , Vanlaer P , Wang J , Adler V , Beernaert K , Benucci L , Cimmino A , Costantini S , Dildick S , Garcia G , Klein B , Lellouch J , Marinov A , Mccartin J , Rios AAO , Ryckbosch D , Sigamani M , Strobbe N , Thyssen F , Tytgat M , Walsh S , Yazgan E , Zaganidis N , Basegmez S , Beluffi C , Bruno G , Castello R , Caudron A , Ceard L , Da Silveira GG , Delaere C , du Pree T , Favart D , Forthomme L , Giammanco A , Hollar J , Jez P , Lemaitre V , Liao J , Militaru O , Nuttens C , Pagano D , Pin A , Piotrzkowski K , Popov A , Selvaggi M , Marono MV , Garcia JMV , Beliy N , Caebergs T , Daubie E , Hammad GH , Alves GA , Martins MC , Martins T , Pol ME , Souza MHG , Alda WL , Carvalho W , Chinellato J , Custodio A , Da Costa EM , Damiao DD , Martins CD , De Souza SF , Malbouisson H , Malek M , Figueiredo DM , Mundim L , Nogima H , Da Silva WLP , Santoro A , Sznajder A , Manganote EJT , Pereira AV , Bernardes CA , Dias FA , Tomei TRFP , Gregores EM , Lagana C , Mercadante PG , Novaes SF , Padula SS , Genchev V , Iaydjiev P , Piperov S , Rodozov M , Sultanov G , Vutova M , Dimitrov A , Hadjiiska R , Kozhuharov V , Litov L , Pavlov B , Petkov P , Bian JG , Chen GM , Chen HS , Jiang CH , Liang D , Liang S , Meng X , Tao J , Wang X , Wang Z , Asawatangtrakuldee C , Ban Y , Guo Y , Li Q , Li W , Liu S , Mao Y , Qian SJ , Wang D , Zhang L , Zou W , Avila C , Montoya CAC , Sierra LFC , Gomez JP , Moreno BG , Sanabria JC , Godinovic N , Lelas D , Plestina R , Polic D , Puljak I , Antunovic Z , Kovac M , Brigljevic V , Kadija K , Luetic J , Mekterovic D , Morovic S , Tikvica L , Attikis A , Mavromanolakis G , Mousa J , Nicolaou C , Ptochos F , Razis PA , Finger M , Finger M , Abdelalim AA , Assran Y , Elgammal S , Kamel AE , Mahmoud MA , Radi A , Kadastik M , Muntel M , Murumaa M , Raidal M , Rebane L , Tiko A , Eerola P , Fedi G , Voutilainen M , Harkonen J , Karimaki V , Kinnunen R , Kortelainen MJ , Lampen T , Lassila-Perini K , Lehti S , Linden T , Luukka P , Maenpaa T , Peltola T , Tuominen E , Tuominiemi J , Tuovinen E , Wendland L , Tuuva T , Besancon M , Couderc F , Dejardin M , Denegri D , Fabbro B , Faure JL , Ferri F , Ganjour S , Givernaud A , Gras P , de Monchenault GH , Jarry P , Locci E , Malcles J , Millischer L , Nayak A , Rander J , Rosowsky A , Titov M , Baffioni S , Beaudette F , Benhabib L , Bluj M , Busson P , Charlot C , Daci N , Dahms T , Dalchenko M , Dobrzynski L , Florent A , de Cassagnac RG , Haguenauer M , Mine P , Mironov C , Naranjo IN , Nguyen M , Ochando C , Paganini P , Sabes D , Salerno R , Sirois Y , Veelken C , Zabi A , Agram JL , Andrea J , Bloch D , Brom JM , Chabert EC , Collard C , Conte E , Drouhin F , Fontaine JC , Gele D , Goerlach U , Goetzmann C , Juillot P , Le Bihan AC , Van Hove P , Gadrat S , Beauceron S , Beaupere N , Boudoul G , Brochet S , Chasserat J , Chierici R , Contardo D , Depasse P , El Mamouni H , Fan J , Fay J , Gascon S , Gouzevitch M , Ille B , Kurca T , Lethuillier M , Mirabito L , Perries S , Sgandurra L , Sordini V , Vander Donckt M , Verdier P , Viret S , Xiao H , Tsamalaidze Z , Autermann C , Beranek S , Bontenackels M , Calpas B , Edelhoff M , Feld L , Heracleous N , Hindrichs O , Klein K , Ostapchuk A , Perieanu A , Raupach F , Sammet J , Schael S , Sprenger D , Weber H , Wittmer B , Zhukov V , Ata M , Caudron J , Dietz-Laursonn E ,

Titolo volume/Rivista

JOURNAL OF HIGH ENERGY PHYSICS

Anno di pubblicazione

2014

ISSN

1029-8479

ISBN

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