Measurement of the muon charge asymmetry in inclusivepp→W+Xproduction ats=7  TeVand an improved determination of light parton distribution functions

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Hall-Wilton,E Butz,S Semenov,S Sharma,I Mikulec,L Forthomme,S Reucroft,R Hughes,A Tricomi,A Sznajder,A Vartak,W Dominik,J Sturdy,D Marlow,R Stone,B Kim,J Hays,A Bonato,A Campbell,S Braibant-Giacomelli,E Laird,S De Visscher,D Ryckbosch,E Schlieckau,P Lamichhane,R Gomez-Reino Garrido,C Hill,M Niegel,S Ochesanu,A Dierlamm,C Tully,G De Lentdecker,P Silva,S Mukherjee,R Castello,M Schröder,A Pin,F Ricci-Tam,R Kroeger,G Tonelli,E Stiliaris,G Codispoti,N Mccoll,L Kreczko,D Rathjens,A Saha,Y Gao,C Palmer,P Verdier,J Pazzini,M Wang,M Paganoni,A Korytov,K Maeshima,M Sharma,G Bianchi,K Ozdemir,P Lenzi,S Linn,C Collard,H El Mamouni,C Hartl,J Fulcher,M Sigamani,S Lowette,T Danielson,V Maroussov,E Yazgan,J Dolen,R Chierici,J Han,T Frueboes,C Baus,B Parida,M Zanetti,W Busza,F Odorici,V Bunichev,C Paus,M Fisher,A Marinov,S Mrenna,S Oliveros,R Carlin,S Harper,G Auzinger,B Francis,M Kasemann,E Navarro De Martino,J Hrubec,F Ptochos,M Bluj,S Lehti,G Abbiendi,Y Tu,M Kenzie,D Lopes Pegna,A Potenza,M Edelhoff,T Bergauer,J Hirschauer,O Novgorodova,E De La Cruz-Burelo,D Puigh,S Hewamanage,D Pagano,M Choi,I Bucinskaite,R Granier De Cassagnac,W Xie,V O’Dell,A Florent,B Pavlov,P Papacz,S Ghosh,S Salur,E Friis,S Choi,C Nuttens,L Barone,J Caudron,G Ryu,S Dasu,C Florez,J Velkovska,J Haas,J Sekaric,M Nguyen,W Wu,V Palichik,J Marco,R Arcidiacono,A Guneratne Bryer,A Zanetti,J Goh,A Psallidas,B Diamond,P Lecoq,Y Kim,M Pieri,M Swartz,J Yoo,M Simon,J Bendavid,M Lebourgeois,G Flügge,K Petridis,A Khukhunaishvili,K Deiters,M Murray,P Zotto,P Ronchese,A Godshalk,M Merola,E Karavakis,G Dissertori,M Velasco,M Kress,J Puerta Pelayo,H Snoek,Q Li,R Rahmat,W Adam,H Jung,T Lomtadze,P Klabbers,A Solano,K Matchev,S Beranek,G Petrillo,D Lange,A Bean,S Chauhan,R Frazier,A Skuja,Y.-J Lee,R Bainbridge,Sh Jain,K Stenson,L Scodellaro,V Sola,G Nicolas Kaufman,V Halyo,J Kolb,M Djordjevic,D Pitzl,A Kubik,R Kogler,J Bernardini,L Bianchini,M Feindt,M Górski,A Ferapontov,W Treberer-Treberspurg,L Antonelli,B Bilin,S Tkaczyk,J D’Hondt,A Belyaev,P Siegrist,A Gude,D Stuart,A Bocci,M Malberti,K Kovitanggoon,A Mott,C Seitz,W Andrews,G Flucke,J Rodrigues Antunes,M Azarkin,R Sever,H Mermerkaya,M Della Negra,I Vorobiev,T Dorland,G Quast,V Chiochia,S Qazi,A Attikis,C Campagnari,G Anagnostou,A Kropivnitskaya,M Spiropulu,A Toropin,L Lusito,C Civinini,U Grundler,S Vanini,R Frühwirth,D Roy,L Winstrom,S Dutta,L Sulak,S Troshin,S Luyckx,V Khotilovich,A Singovsky,M Maity,K Hatakeyama,R Kelley,A Lopez Virto,S Ahuja,N Ratnikova,V Savrin,J Pela,G Petrucciani,M Müntel,F Couderc,J Karancsi,A Martelli,S Taroni,S Sumowidagdo,D Duchardt,M Musich,S Nuzzo,C Heidemann,A Mohammadi,C Battilana,I Suarez,T Bose,K Lannon,A Poll,P Chang,K Sumorok,V Ciulli,K Androsov,F Beaudette,R Gonzalez Suarez,T Aziz,S Malhotra,B Boimska,M Biasini,T Yetkin,R Khurana,K Rose,L Tourtchanovitch,S Casasso,A Meyer,D Sunar Cerci,S Bansal,J Sammet,I Yu,A Giammanco,Y Yang,S Piperov,C West,R Redjimi,L Gray,P Symonds,D Montanino,N Tosi,A Shrinivas,U 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Zabel,R Harr,L Perniè,M Murumaa,L Apanasevich,P Thomassen,M Donegà,A Gilbert,N Lychkovskaya,A Rose,P Paolucci,P Dauncey,C Grandi,L Barbone,A Popov,O Hindrichs,L Mucibello,S Jindariani,V Karimäki,Z Demiragli,P Sorokin,A Taurok,X Janssen,D Piparo,H Saka,S Schael,A Penzo,R Carroll,A Gurtu,J Butt,M Shoaib,N Pastika,S Spanier,D Loukas,D Lelas,A Sharma,R Lucas,T Boccali,F Lacroix,B Klein,F Drouhin,T Lapsien,G Flouris,D Nash,S Arora,V Murzin,A Jafari,P Van Mulders,S Rogerson,P Shukla,R.-S Lu,P Everaerts,V Bhatnagar,S Gninenko,S Gennai,H Sakulin,P Raics,J.-L Agram,V Innocente,S Morovic,C Markou,C Maguire,Th Müller,A Barker,H Kalakhety,A Lanev,M Seidel,A Custódio,E Gülmez,L Xu,A Kamenev,K Yi,C Jarvis,M Meschini,M Kaya,R Ryutin,D Carlsmith,S Bianco,S Thomas,U Heintz,M Casarsa,E Paradas,G Rolandi,O Gutsche,J Keaveney,G Vesztergombi,S König,J Olsen,M Szleper,D Lincoln,P Goldenzweig,L Benucci,M Luk,L Sonnenschein,S Viret,A Savin,T Orimoto,J Gilmore,D Piccolo,P Van Hove,M Rodenburg,A Grebenyuk,Y Erdogan,S Costa,J Conway,M Jeitler,G Ortona,C Willmott,A Hervé,M D’Alfonso,L Sgandurra,A Pompili,H Van Haevermaet,A Woodard,N Nishu,T Virdee,F Costanza,A Moeller,K Beernaert,N Redaelli,P Moisenz,F.-P Schilling,I Dremin,L Dudko,P Meridiani,D Gelé,A Tiko,C Beluffi,V Kumar,A Levin,T Dahms,C Jorda,T Hauth,U Goerlach,J Alexander,L Di Matteo,T Speer,B Ille,B De La Cruz,W Ferguson,M Mohammadi Najafabadi,Y Assran,G Kozlov,D Fehling,C Lucas,P Miné,G Eckerlin,P Sphicas,D Krofcheck,S Walsh,G Christopher,S Sekmen,L Spiegel,A Castro,M Krämer,Y Eshaq,P Sheldon,M Cuffiani,P Bunin,D Stickland,D Eckstein,A Santoro,M Baber,G Karapostoli,S Bose,J Flix,S Boutle,M Aldaya Martin,L Mirabito,R Cousins,J Bunn,G Masetti,B Roland,Q Ingram,M Selvaggi,E Longo,W Luo,A Van Spilbeeck,Y Maravin,D Bortoletto,M Jones,S Park,S Gascon,T Ma,E Brownson,O Bouhali,A Panagiotou,T Cheng,E Meschi,W Behrenhoff,I Golutvin,R Gerosa,J Härkönen,T Rodrigo,A Bornheim,A Khan,F Romeo,O Militaru,B Fabbro,Z Tsamalaidze,R Patel,D Teyssier,I 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Lipton,M Bansal,F Margaroli,G Benelli,R Travaglini,R Sacchi,Y Guo,B Gomez Moreno,G Daskalakis,C Ferro,R Walsh,A Uzunian,G Schott,J Wood,F Wang,A Lath,M Titov,A Dominguez,G Barbagli,B Bylsma,L Masetti,R D’Alessandro,D Hidas,K Bloom,D Noonan,J Rohlf,Z Meng,J Suarez Gonzalez,N Colino,N Bartosik,B Kilminster,Ashok Kumar,B Marzocchi,M Giffels,S Mersi,U Husemann,J Rander,C Sander,N Krasnikov,N Dhingra,L Silvestris,J Berger,J Chasserat,T Sinthuprasith,M Dalchenko,D Horton,I Fisk,V Krutelyov,S Erhan,M Ata,F Bachmair,H Seo,M Olschewski,O Pooth,E Boos,B Wittmer,R Radogna,K Nawrocki,U Joshi,J Duarte,H Kim,L Thomas,R Gupta,T Cornelis,D Martschei,E Perez,M Goncharov,M Weinberg,W Carvalho,I Marchesini,A Anastassov,U Akgun,S Kailas,D Trocino,M Abbrescia,S Won,M Schmitt,M Kirakosyan,D Mason,B Gomber,Y Choi,A Harel,I Puljak,A Calamba,S Alderweireldt,A Savoy-Navarro,D Duggan,P Avery,S Sarkar,T Peiffer,R Potenza,D Rabady,F Ferro,M Rossini,S Tavernier,D Evans,B Millan Mejias,T Khurshid,C Mesropian,I Evangelou,D Bonacorsi,A Geiser,R Hadjiiska,W Clarida,K Kadija,S Ozturk,M Krammer,J Eugster,M Pierini,N Mohr,E Calvo,D Gyun,M Rovere,R Paramatti,S Baffioni,E Gallo,G Safronov,D Domínguez Vázquez,A Chatterjee,D Winn,D Wright,R Schmidt,F Duru,V Konoplyanikov,K Flowers,L Zhang,P Musella,T Aliev,M Hohlmann,B Mathias,C Bernet,P Mcbride,N Tyurin,S Khalatyan,A Lanaro,L Levchuk,M Guchait,S Bolognesi,M Görner,S Marcellini,B Tali,Sa Jain,M Arneodo,Arun Kumar,R Du,R Gray,Y Musienko,S Wilbur,E Petrakou,S Somalwar,E Migliore,J Mans,A Modak,M Dünser,E Dietz-Laursonn,W De Boer,M Bontenackels,B Rahbaran,F Ferri,N Pietsch,R Clare,R Rossin,M Zeinali,A Stahl,W Funk,A Rizzi,P Checchia,X Wang,D Burton,P Sharp,M Lethuillier,L Foà,H Held,A Radi,S Wayand,E Kuznetsova,S Kesisoglou,M Stoye,R Dell’Orso,Z Wang,G Kukartsev,D Del Re,J Lee,J Letts,M Park,J Zablocki,A De Roeck,M Zakaria,N Mirman,Y Fu,G Gomez Ceballos,C Justus,A Romero,A Nikitenko,L Perchalla,J Incandela,A Zhokin,R Ulrich,L Favart,V Matveev,B Pollack,J 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Cortabitarte,C Brew,E Casimiro Linares,A Juodagalvis,M Marone,A Caudron,P Iaydjiev,J Jones,A Svyatkovskiy,G Landsberg,L Taylor,R Nandi,K Pedro,R Horisberger,M Verzetti,D Silvers,R Vidal,M Girone,A Baden,I J Cabrillo ,M Besançon ,A O M Iorio ,P Adžić ,M I Josa ,J A Brochero Cifuentes ,J W Gary ,Yu‐Wei Chang ,D A Belknap ,T Maënpaä ,W L Aldá Júnior ,F Özok ,Seth Conrad Zenz ,F R Cavallo ,F Pauß ,P D Luckey ,P Jež ,Karl Matthew Ecklund ,T Y Kim ,W T Ford ,O González López ,L Felď ,G R Snow ,B A Barnett ,K Cankoçak ,W L Prado Da Silva ,R Plačakytė ,M Correa Martins ,S Swain ,C Hajdú ,Ashish Kumar ,A V Gritsan ,M P Geisler ,M J Kortelainen ,J W Smith ,R K Shivpuri ,B C Choudhary ,I P J Shipsey ,A J Zsigmond ,C Tuvé ,J Ilić ,D Kçira ,H S Chen ,Gustavo Gil Da Silveira ,G Mäggi ,H A Weber ,Sergio F Novaes ,C Oʼbrien ,Humberto Antonio Salazar Ibarguen ,C S Moon ,B R Drell ,L Dobrzyński ,Masashi Takahashi ,А Калинин ,S R Wagner ,A Rossi ,L Muñiz ,А Спиридонов ,P Garcı́a-Abia ,X T Meng ,D H 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doi:10.1103/physrevd.90.032004

Abstract

Measurements of the muon charge asymmetry in inclusive pp to WX production at sqrt(s) = 7 TeV are presented. The data sample corresponds to an integrated luminosity of 4.7 inverse femtobarns recorded with the CMS detector at the LHC. With a sample of more than twenty million W to mu nu events, the statistical precision is greatly improved in comparison to previous measurements. These new results provide additional constraints on the parton distribution functions of the proton in the range of the Bjorken scaling variable x from 10E-3 to 10E-1. These measurements and the recent CMS measurement of associated W + charm production are used together with the cross sections for inclusive deep inelastic ep scattering at HERA in a next-to-leading-order QCD analysis. The determination of the valence quark distributions is improved, and the strange-quark distribution is probed directly through the leading-order process g + s to W + c in proton-proton collisions at the LHC.

Highlights

In the standard model (SM), the dominant processes for inclusive W-boson production in pp collisions are annihilation processes: ud → Wþ and du → W− involving a valence quark from one proton and a sea antiquark from the other
We report a measurement of the muon charge asymmetry using a data sample corresponding to an integrated luminosity of 4.7 fb−1 collected with the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC) in 2011
Both statistical and systematic uncertainties are included in the error bars. These asymmetries are compared to predictions based on several parton distribution functions (PDFs) sets

Summary

Introduction

In the standard model (SM), the dominant processes for inclusive W-boson production in pp collisions are annihilation processes: ud → Wþ and du → W− involving a valence quark from one proton and a sea antiquark from the other. The Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) has investigated this production asymmetry in inclusive W-boson production and measured the inclusive ratio of ptotffiffial cross sections for Wþ and W− boson production at s 1⁄4 7 TeV to be 1.421 Æ 0.006ðstatÞ Æ 0.032ðsystÞ [1]. This result is in agreement with SM predictions based on various parton distribution functions (PDFs) such as the MSTW2008 and CT10 PDF sets [2,3].

Methods

Results

Conclusion