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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

Articolo
Data di Pubblicazione:
2023
Abstract:
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 * + → D 0 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 , and 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 - 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.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Particle physics, High energy physics
Elenco autori:
Aad, G.; Abbott, B.; Abeling, K.; Abidi, S.  H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Abusleme Hoffman, A.  C.; Acharya, B.  S.; Adam Bourdarios, C.; Adamczyk, L.; Adamek, L.; Addepalli, S.  V.; Adelman, J.; Adiguzel, A.; Adorni, S.; Adye, T.; Affolder, A.  A.; Afik, Y.; Agaras, M.  N.; Agarwala, J.; Aggarwal, A.; Agheorghiesei, C.; Aguilar-Saavedra, J.  A.; Ahmad, A.; Ahmadov, F.; Ahmed, W.  S.; Ahuja, S.; Ai, X.; Aielli, G.; Ait Tamlihat, M.; Aitbenchikh, B.; Aizenberg, I.; Akbiyik, M.; Åkesson, T.  P.  A.; Akimov, A.  V.; Akiyama, D.; Akolkar, N.  N.; Al Khoury, K.; Alberghi, G.  L.; Albert, J.; Albicocco, P.; Alderweireldt, S.; Aleksa, M.; Aleksandrov, I.  N.; Alexa, C.; Alexopoulos, T.; Alfonsi, A.; Alfonsi, F.; Alhroob, M.; Ali, B.; Ali, S.; Aliev, M.; Alimonti, G.; Alkakhi, W.; Allaire, C.; Allbrooke, B.  M.  M.; Allendes Flores, C.  A.; Allport, P.  P.; Aloisio, A.; Alonso, F.; Alpigiani, C.; Alvarez Estevez, M.; Alvarez Fernandez, A.; Alviggi, M.  G.; Aly, M.; Amaral Coutinho, Y.; Ambler, A.; Amelung, C.; Amerl, M.; Ames, C.  G.; Amidei, D.; Amor Dos Santos, S.  P.; Amos, K.  R.; Ananiev, V.; Anastopoulos, C.; Andeen, T.; Anders, J.  K.; Andrean, S.  Y.; Andreazza, A.; Angelidakis, S.; Angerami, A.; Anisenkov, A.  V.; Annovi, A.; Antel, C.; Anthony, M.  T.; Antipov, E.; Antonelli, M.; Antrim, D.  J.  A.; Anulli, F.; Aoki, M.; Aoki, T.; Aparisi Pozo, J.  A.; Aparo, M.  A.; Aperio Bella, L.; Appelt, C.; Aranzabal, N.; Araujo Ferraz, V.; Arcangeletti, C.; Arce, A.  T.  H.; Arena, E.; Arguin, J-F.; Argyropoulos, S.; Arling, J. -H.; Armbruster, A.  J.; Arnaez, O.; Arnold, H.; Arrubarrena Tame, Z.  P.; Artoni, G.; Asada, H.; Asai, K.; Asai, S.; Asbah, N.  A.; Assahsah, J.; Assamagan, K.; Astalos, R.; Atkin, R.  J.; Atkinson, M.; Atlay, N.  B.; Atmani, H.; Atmasiddha, P.  A.; Augsten, K.; Auricchio, S.; Auriol, A.  D.; Austrup, V.  A.; Avner, G.; Avolio, G.; Axiotis, K.; Azuelos, G.; Babal, D.; Bachacou, H.; Bachas, K.; Bachiu, A.; Backman, F.; Badea, A.; Bagnaia, P.; Bahmani, M.; Bailey, A.  J.; Bailey, V.  R.; Baines, J.  T.; Bakalis, C.; Baker, O.  K.; Bakos, E.; Bakshi Gupta, D.; Balasubramanian, R.; Baldin, E.  M.; Balek, P.; Ballabene, E.; Balli, F.; Baltes, L.  M.; Balunas, W.  K.; Balz, J.; Banas, E.; Bandieramonte, M.; Bandyopadhyay, A.; Bansal, S.; Barak, L.; Barberio, E.  L.; Barberis, D.; Barbero, M.; Barbour, G.; Barends, K.  N.; Barillari, T.; Barisits, M-S.; Barklow, T.; Baron, P.; Baron Moreno, D.  A.; Baroncelli, A.; Barone, G.; Barr, A.  J.; Barranco Navarro, L.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Barron, U.; Barros Teixeira, M.  G.; Barsov, S.; Bartels, F.; Bartoldus, R.; Barton, A.  E.; Bartos, P.; Basan, A.; Baselga, M.; Bassalat, A.; Basso, M.  J.; Basson, C.  R.; Bates, R.  L.; Batlamous, S.; Batley, J.  R.; Batool, B.; Battaglia, M.; Battulga, D.; Bauce, M.; Bauer, M.; Bauer, P.; Beacham, J.  B.; Beau, T.; Beauchemin, P.  H.; Becherer, F.; Bechtle, P.; Beck, H.  P.; Becker, K.; Beddall, A.  J.; Bednyakov, V.  A.; Bee, C.  P.; Beemster, L.  J.; Beermann, T.  A.; Begalli, M.; Begel, M.; Behera, A.; Behr, J.  K.; Beirer, J.  F.; Beisiegel, F.; Belfkir, M.; Bella, G.; Bellagamba, L.; Bellerive, A.; Bellos, P.; Beloborodov, K.; Belyaev, N.  L.; Benchekroun, D.; Bendebba, F.; Benhammou, Y.; Benoit, M.; Bensinger, J.  R.; Bentvelsen, S.; Beresford, L.; Beretta, M.; Bergeaas Kuutmann, E.; Berger, N.; Bergmann, B.; Beringer, J.; Berlendis, S.; Bernardi, G.; Bernius, C.; Bernlochner, F.  U.; Berry, T.; Berta, P.; Berthold, A.; Bertram, I.  A.; Bethke, S.; Betti, A.; Bevan, A.  J.; Bhamjee, M.; Bhatta, S.; Bhattacharya, D.  S.; Bhattarai, P.; Bhopatkar, V.  S.; Bi, R.; Bianchi, R.  M.; Bianco, G.; Biebel, O.; Bielski, R.; Biglietti, M.; Billoud, T.  R.  V.; Bindi, M.; Bingul, A.; Bini
Autori di Ateneo:
GAUDIO GABRIELLA
INTROZZI GIANLUCA
NEGRI ANDREA
REBUZZI DANIELA MARCELLA
ROMANO EMANUELE
Link alla scheda completa:
https://iris.unipv.it/handle/11571/1515776
Pubblicato in:
PHYSICAL REVIEW D
Journal
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