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Adorni, S; Afik, Y; Agaras, MN; Ahmad, A; Ahuja, S; Ai, X; Alderweireldt, S; Ali, S; Aliev, M; Alpigiani, C; Ambler, A; Ames, CG; Dos Santos, SP Amor; Annovi, A; Anulli, F; Aoki, M; Aparo, MA; Bella, L Aperio; Ferraz, V Araujo; Arling, J-H; Assahsah, J; Atmani, H; Azuelos, G; Backman, F; Ballabene, E; Banas, E; Baron, P; Barone, G; Barreiro, F; Barsov, S; Bartels, F; Bartoldus, R; Barton, AE; Basso, MJ; Batool, B; Bee, CP; Beirer, JF; Belfkir, M; Benhammou, Y; Benoit, M; Bentvelsen, S; Bergmann, B; Bernius, C; Berthold, A; Bethke, S; Bhamjee, M; Bhattacharya, DS; Bianchi, RM; Bielski, R; Bitadze, A; Blocker, C; Blumenthal, J; Bogdanchikov, AG; Bohm, C; Boisvert, V; Bokan, P; Booth, CD; Bordulev, IS; Borgna, LS; Bouhova-Thacker, EV; Boyd, J; Boye, D; Boyko, IR; Britton, D; Bruncko, D; Budagov, IA; Bugge, MK; Bullard, BA; Burdin, S; Burton, CD; Buttinger, W; Buzykaev, AR; Cairo, VMM; Calvet, S; Calvetti, M; Cameron, D; Cantero, J; Cardarelli, R; Carminati, L; Carrá, S; Cavalli, N; Centonze, MS; Cerny, K; Cerutti, F; Chan, WY; Chekulaev, SV; Chelkov, GA; Chen, H; Chen, J; Cheong, S; Cheplakov, A; Cherepanova, E; Cheu, E; Chiedde, N; Christopher, LD; Cieri, D; Ciubotaru, DA; Ciungu, BM; Clark, PJ; Columbie, JM Clavijo
Physical review. D, 08/2023, Letnik: 108, Številka: 3Journal Article
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.
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