Measurement of the electron charge asymmetry in inclusive W production in pp collisions at √s=7TeV


Chatrchyan S., Khachatryan V., Sirunyan A., Tumasyan A., Adam W., Bergauer T., ...More

Physical Review Letters, vol.109, no.11, 2012 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 109 Issue: 11
  • Publication Date: 2012
  • Doi Number: 10.1103/physrevlett.109.111806
  • Journal Name: Physical Review Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Yıldız Technical University Affiliated: No

Abstract

A measurement of the electron charge asymmetry in inclusive pp→W+X→eν+X production at √s=7TeV is presented based on data recorded by the CMS detector at the LHC and corresponding to an integrated luminosity of 840pb -1. The electron charge asymmetry reflects the unequal production of W + and W - bosons in pp collisions. The electron charge asymmetry is measured in bins of the absolute value of electron pseudorapidity in the range of |η|<2.4. The asymmetry rises from about 0.1 to 0.2 as a function of the pseudorapidity and is measured with a relative precision better than 7%. This measurement provides new stringent constraints for parton distribution functions.