Study of W boson production in pPb collisions at [formula omitted

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,C La Licata ,A Rinkevičius ,J Roe ,M De Mattia ,A Ostapchuk ,F Santanastasio ,K Doroba ,K Yi ,A Knutsson ,S Gninenko ,C A Carrillo Montoya ,M Fisher ,I Kravchenko ,D Puigh ,S M Spanier ,G.m Chen ,H Behnamian ,Lloyd Stanley Durkin ,P Salvini ,G Landsberg ,S Ochesanu ,K Sung ,N Cavallo ,F Bachmair ,G Hall ,S Kaplan ,V Gori ,D Kotliński ,M W Arenton ,A Rizzi ,R Sacchi ,J F Benitez ,C E Gerber ,M Goncharov ,N Béni ,C A Bernardes ,N Eggert ,K Nawrocki ,T Weiler ,R Clare ,M Ata ,A Rosowsky ,Sh Jain ,A Dishaw ,M Musich ,D Konstantinov ,K Chatterjee ,B Diamond ,P Katsas ,M Naimuddin ,P.h Chen ,M Margoni ,M Grünewald ,G L Pinna Angioni ,K Beernaert ,I Svintradze ,A Nikitenko ,S Ghosh ,H Wolfe ,D Polic ,A Khukhunaishvili ,S Lehti ,N Daci ,V Savrin ,C Diez Pardos ,Y Gershtein ,W D Zeuner ,C Welke ,R Yohay ,A Beretvas ,F Nessi‐Tedaldi ,K Lassila-Perini ,P Azzurri ,A Kropivnitskaya ,A Shrinivas ,S Choudhury ,N Mirman ,E Focardi ,E Paradas ,J Königsberg ,M Misiura ,J Veverka ,E Tuominen ,A Santocchia ,M Merola ,J Keller ,D Stickland ,P Mcbride ,S Malhotra ,A Delgado Peris ,L Pape ,D Ryckbosch ,P Garcı́a-Abia ,L Rebane ,D Petyt ,G P Heath ,K Klein ,Z Szillási ,Y Musienko ,J F Schulte ,J Mnich ,K Kovitanggoon ,J Erfle ,Y Ban ,M Kaya ,B Gomber ,I Vorobiev ,B Mangano ,I Dremin ,E A De Wolf ,L Spiegel ,M Azarkin ,C Barth ,A Modak ,P Bortignon ,J Dolen ,M Schröder ,L Orsini ,C Paus ,C Clarke ,M Jo ,E M Gregores ,R Hall-Wilton ,G Boudoul ,N Pastika ,J M Hernández ,J Chinellato ,C Lucas ,J Sekaric ,M Lipiński ,F Moortgat ,J Swanson ,S Beauceron ,J K Behr ,A Pozdnyakov ,A Elwood ,N Heracleous ,L Uplegger ,C Henderson ,S Jabeen ,M Murumaa ,S Rahatlou ,J Hollar ,G Broccolo ,I Suarez ,T Tuuva ,F Rebassoo ,A Marinov ,M Peruzzi ,A Rácz ,M Johnson ,J Andreä ,P Markowitz ,O Charaf ,R Castaldi ,V Re ,K Lannon ,R Ryutin ,J Tuominiemi ,K Klapoetke ,G Abbiendi ,C Delaere ,G B Mohanty ,T Sarangi ,A Adair ,S Gonzi ,A Melo ,I Pozdnyakov ,M Erdmann ,G Bruno ,G Petrucciani ,W Johns ,L Kreczko ,P Harris ,J Damgov ,S Bhowmik ,W Clarida ,K Skovpen ,C Heidemann ,A Kalinowski ,D Ralph ,S Bitioukov ,T Ferguson ,H Méndez ,S S Yu ,C Hajdú ,L Taylor ,Y Kuessel ,M Khakzad ,L Ceard ,A Drozdetskiy ,A Olbrechts ,T Y Ling ,S Luyckx ,S.k Park ,I Volobouev ,B Parida ,I Azhgirey ,C Jessop ,A Tapper ,W L Aldá Júnior ,I A Cali ,P Van Mulders ,W Li ,J Haller ,Andrey Demiyanov ,I Puljak ,C Botta ,S Dittmer ,B Dahmes ,N Parashar ,M Szleper ,G Cappello ,R Rahmat ,B Klima ,H Flächer ,R Hadjiiska ,M Meschini ,T Bose ,M Mannelli ,S Tosi ,J.-C Fontaine ,G Benelli ,A C Marini ,M Kirakosyan ,N Woods

doi:10.1016/j.physletb.2015.09.057

Abstract

The first study of W boson production in pPb collisions is presented, for bosons decaying to a muon or electron, and a neutrino. The measurements are based on a data sample corresponding to an integrated luminosity of 34.6 nb−1 at a nucleon–nucleon centre-of-mass energy of sNN=5.02 TeV, collected by the CMS experiment. The W boson differential cross sections, lepton charge asymmetry, and forward–backward asymmetries are measured for leptons of transverse momentum exceeding 25 GeV/c, and as a function of the lepton pseudorapidity in the |ηlab|<2.4 range. Deviations from the expectations based on currently available parton distribution functions are observed, showing the need for including W boson data in nuclear parton distribution global fits.

Highlights

Electroweak boson production in proton–nucleus and nucleus– nucleus collisions at the CERN LHC offers a unique opportunity to probe nuclear parton distribution functions [1,2,3,4]
Precise measurements of W boson production in heavy ion collisions might lead to an improved determination of the nuclear parton distribution functions (nPDFs)
The differential cross sections as a function of the lepton pseudorapidity agree with theoretical predictions assuming both unmodified (CT10) and modified (CT10+EPS09) nPDFs, except in the most backward region (Pb ion beam direction), where a hint of an enhancement is seen for the W− bosons

Summary

Introduction

Electroweak boson production in proton–nucleus and nucleus– nucleus collisions at the CERN LHC offers a unique opportunity to probe nuclear parton distribution functions (nPDFs) [1,2,3,4]. Leptonic decays of electroweak bosons are of particular interest since leptons do not interact strongly with the medium produced in these collisions [5,6]. As compared to those in a proton, the nPDFs are expected to be depleted (shadowing) for partons carrying small momentum fractions x 10−2, and enhanced (anti-shadowing) in the 5 × 10−2 x 10−1 range [7]. Precise measurements of W boson production in heavy ion collisions might lead to an improved determination of the nPDFs. asymmetries in the individual yields of W+ and W− should permit the flavour decomposition of u and d quark distributions in nuclei

Methods

Results

Conclusion