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Title: Measurement of the production of a $$W$$ boson in association with a charmed hadron in $pp$ collisions at $$\sqrt{s}$$ = $$\mathrm{13 TeV}$$ with the ATLAS detector

Journal Article · · Physical Review. D.
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  1. Centre National de la Recherche Scientifique (CNRS) (France); Aix-Marseille Univ., Marseille (France); ATLAS Collaboration. et al.
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The production of a $$W$$ boson in association with a single charm quark is studied using 140 fb–1 of $$\sqrt{s}$$ = $13$ $$\mathrm{TeV}$$ 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*+ → D0 π+ → (K– π+) π+ and the charge conjugate decays in the fiducial regions where $$p$$T($e,μ$) > 30 GeV, |$η(e,μ)$| < 2.5, $$p$$T (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 $${σ}_{fid}^{OS – SS}$$ (W– + D+) = 50.2 ± 0.2 $${(stat)}_{–2.3}^{+2.4}$$(syst) pb, $${σ}_{fid}^{OS – SS}$$ (W+ + D–) = 48.5 ± 0.2 $${(stat)}_{–2.2}^{+2.3}$$(syst) pb, $${σ}_{fid}^{OS – SS}$$ (W– + D*+) = 51.1 ± 0.4 $${(stat)}_{–1.8}^{+1.9}$$(syst) pb, $${σ}_{fid}^{OS – SS}$$ (W+ + D*–) = 50.0 ± 0.4 $${(stat)}_{–1.8}^{+1.9}$$(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 $$s$$-$$\bar{s}$$ 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 $$s$$-$$\bar{s}$$ sea, indicating that any $$s$$-$$\bar{s}$$ asymmetry in the Bjorken-x region relevant for this measurement is small.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
ATLAS Collaboration
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2281848
Journal Information:
Physical Review. D., Vol. 108, Issue 3; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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