First Measurement Of Charm Production In Its Fixed-Target Configuration At The Lhc
R. Aaij, B. Adeva,M. Adinolfi,C. A. Aidala,Z. Ajaltouni,S. Akar,P. Albicocco,J. Albrecht,F. Alessio,M. Alexander, A. Alfonso Albero,S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves Jr,S. Amato, S. Amerio, Y. Amhis,L. An, L. Anderlini,G. Andreassi,M. Andreotti,J. E. Andrews,R. B. Appleby,F. Archilli, P. D'Argent,J. Arnau Romeu,A. Artamonov, M. Artuso, K. Arzymatov,E. Aslanides,M. Atzeni, B. Audurier,S. Bachmann, J. J. Back,S. Baker, V Balagura,W. Baldini,A. Baranov,R. J. Barlow,S. Barsuk,W. Barter, F. Baryshnikov, V Batozskaya,B. Batsukh,V Battista, A. Bay, J. Beddow, F. Bedeschi, I Bediaga, A. Beiter,L. J. Bel, S. Belin,N. Beliy, V Bellee, N. Belloli,K. Belous, I Belyaev, E. Ben-Haim, G. Bencivenni,S. Benson,S. Beranek, A. Berezhnoy, R. Bernet,D. Berninghoff, E. Bertholet, A. Bertolin, C. Betancourt, F. Betti,M. O. Bettler, M. Van Beuzekom,Ia Bezshyiko, S. Bhasin,J. Bhom,S. Bifani,P. Billoir, A. Birnkraut, A. Bizzeti,M. Bjorn,M. P. Blago,T. Blake,F. Blanc,S. Blusk, D. Bobulska,V Bocci, O. Boente Garcia, T. Boettcher, A. Bondar, N. Bondar,S. Borghi,M. Borisyak,M. Borsato, F. Bossu,M. Boubdir,T. J. Bowcock,C. Bozzi,S. Braun, M. Brodski,J. Brodzicka, A. Brossa Gonzalo,D. Brundu, E. Buchanan,A. Buonaura,C. Burr, A. Bursche, J. Buytaert,W. Byczynski, S. Cadeddu,H. Cai,R. Calabrese, R. Calladine,M. Calvi, M. Calvo Gomez,A. Camboni,P. Campana,D. H. Campora Perez, L. Capriotti,A. Carbone, G. Carboni,R. Cardinale, A. Cardini,P. Carniti,L. Carson, K. Carvalho Akiba,G. Casse,L. Cassina,M. Cattaneo, G. Cavallero, R. Cenci, D. Chamont,M. G. Chapman,M. Charles,Ph Charpentier, G. Chatzikonstantinidis,M. Chefdeville,V Chekalina,C. Chen,S. Chen, S-G Chitic,V Chobanova, M. Chrzaszcz, A. Chubykin, P. Ciambrone, X. Cid Vidal,G. Ciezarek,P. E. L. Clarke, M. Clemencic, H. Cliff,J. Closier, V Coco, J. A. B. Coelho,J. Cogan,E. Cogneras,L. Cojocariu,P. Collins, T. Colombo, A. Comerma-Montells,A. Contu,G. Coombs, S. Coquereau,G. Corti,M. Corvo, C. M. Costa Sobral, B. 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arXiv: High Energy Physics - Experiment（2019）
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摘要
The first measurement of heavy-flavor production by the LHCb experiment in its fixed-target mode is presented. The production of J/psi and D-0 mesons is studied with beams of protons of different energies colliding with gaseous targets of helium and argon with nucleon-nucleon center-of-mass energies of root s(NN) = 86.6 and 110.4 GeV, respectively. The J/psi and D-0 production cross sections in pHe collisions in the rapidity range [2, 4.6] are found to be sigma(J/psi) = 652 +/- 33(stat) +/- 42(syst) nb/nucleon and sigma(D0) = 80.8 +/- 2.4(syst) +/- 6.3(syst) mu b/nucleon, where the first uncertainty is statistical and the second is systematic. No evidence for a substantial intrinsic charm content of the nucleon is observed in the large Bjorken-x region.
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关键词
charm production,lhc,fixed-target
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