Measurement of W- and Z-boson production in p—Pb collisions at √sNN = 5.02 TeV with ALICE at the LHC

摘要

Inhadroniccollisions,electroweakbosons(WandZ)areproducedininitialhardscatteringprocessesandtheyarenotaffectedbythestronginteraction.Inproton-protoncollisions,theyhavebeensuggestedasstandardcandlesforluminositymonitoringandtheirmeasurementcanimprovetheevaluationofdetectorperformances.Innucleus-nucleusandproton-nucleuscollisions,electroweakbosonsprovideacheckatfirstorderofthevalidityofbinarycollisionscaling,whilesmalldeviationsallowstudyingthenuclearmodificationsofpartondistributionfunctions.InALICE,theproductionofWandZbosonsismeasuredviathecontributionofW-bosondecaystotheinclusivepT-differentialmuonyieldandtheinvariantmassofunlike-signmuonpairsfromZ-bosondecays,respectively,atlargerapidities.ThispaperreportsontheproductioncrosssectionsofmuonsfromWmuonicdecayandofZbosoninp-Pbcollisionsat√sNN=5.02TeV,whicharecomparedtothetheoreticalcalculations,andontheW-bosonyieldsnormalizedtotheaveragenumberofbinarynucleon-nucleoncollisionsasafunctionoftheeventactivity...