Measurement of the production of a W boson in association with a charmed hadron in pp collisions at √s=13  TeV with the ATLAS detector

ATLAS Publications, T.M. Carter, R.Y. Gonzalez Andana, A. Hasib, V.A. Parrish, E.A. Pender, T. Qiu, E.P. Takeva, N. Themistokleous, E.M. Villhauer, Z. Xu, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The production of a W boson in association with a single charm quark is studied using 140  fb−1 of √s=13  TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The charm quark is tagged by the presence of a charmed hadron reconstructed with a secondary-vertex fit. The W boson is reconstructed from the decay to either an electron or a muon and the missing transverse momentum present in the event. The charmed mesons reconstructed are D+→K−π+π+ and D*+→D0π+→(K−π+)π+ and the charge conjugate decays in the fiducial regions where pT(e,μ)>30  GeV, |η(e,μ)|<2.5, pT(D(*))>8  GeV, and |η(D(*))|<2.2. The integrated and normalized differential cross sections as a function of the pseudorapidity of the lepton from the W boson decay, and of the transverse momentum of the charmed hadron, are extracted from the data using a profile likelihood fit. The measured total fiducial cross sections are σOS–SSfid(W−+D+)=50.2±0.2(stat)+2.4−2.3(syst)  pb, σOS–SSfid(W++D−)=48.5±0.2(stat)+2.3−2.2(syst)  pb, σOS–SSfid(W−+D*+)=51.1±0.4(stat)+1.9−1.8(syst)  pb, and σOS–SSfid(W++D*−)=50.0±0.4(stat)+1.9−1.8(syst)  pb. Results are compared with the predictions of next-to-leading-order quantum chromodynamics calculations performed using state-of-the-art parton distribution functions. Additionally, the ratio of charm to anticharm production cross sections is studied to probe the s−¯s quark asymmetry. The ratio is found to be R±c=0.971±0.006(stat)±0.011(syst). The ratio and cross-section measurements are consistent with the predictions obtained with parton distribution function sets that have a symmetric s−¯s sea, indicating that any s−¯s asymmetry in the Bjorken-x region relevant for this measurement is small.
Original languageEnglish
Article number032012
Pages (from-to)1-54
Number of pages54
JournalPhysical Review D
Issue number3
Publication statusPublished - 14 Aug 2023

Keywords / Materials (for Non-textual outputs)

  • Pair Production
  • Plus Plus
  • Quark


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