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Λ+c production in pp collisions at √s=7 TeV and in p-Pb collisions at √sNN=5.02 TeV (CROSBI ID 255255)

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(ALICE Collaboration) Acharya, S. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... et al. Λ+c production in pp collisions at √s=7 TeV and in p-Pb collisions at √sNN=5.02 TeV // The Journal of high energy physics, 2018 (2018), 108, 40. doi: 10.1007/JHEP04(2018)108

Podaci o odgovornosti

Acharya, S. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Simatović, Goran ; ... ; Utrobičić, Antonija ; ... ; Vicković, Linda ; ... ; Zou, S.

ALICE Collaboration

engleski

Λ+c production in pp collisions at √s=7 TeV and in p-Pb collisions at √sNN=5.02 TeV

The pT-differential production cross section of prompt Λ+c charmed baryons was measured with the ALICE detector at the Large Hadron Collider (LHC) in pp collisions at √s=7 TeV and in p-Pb collisions at √sNN=5.02 TeV at midrapidity. The Λ+c and Λ¯−c were reconstructed in the hadronic decay modes Λ+c→pK−π+, Λ+c→pK0S and in the semileptonic channel Λ+c→e+νeΛ (and charge conjugates). The measured values of the Λ+c/D0 ratio, which is sensitive to the c-quark hadronisation mechanism, and in particular to the production of baryons, are presented and are larger than those measured previously in different colliding systems, centre-of-mass energies, rapidity and pT intervals, where the Λ+c production process may differ. The results are compared with the expectations obtained from perturbative Quantum Chromodynamics calculations and Monte Carlo event generators. Neither perturbative QCD calculations nor Monte Carlo models reproduce the data, indicating that the fragmentation of heavy-flavour baryons is not well understood. The first measurement at the LHC of the Λ+c nuclear modification factor, RpPb, is also presented. The RpPb is found to be consistent with unity and with that of D mesons within the uncertainties, and consistent with a theoretical calculation that includes cold nuclear matter effects and a calculation that includes charm quark interactions with a deconfined medium.

Lambda ; Production ; pp ; pPb ; 5.02 TeV ; 7 TeV

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Podaci o izdanju

2018

2018.

108

40

objavljeno

1126-6708

1029-8479

10.1007/JHEP04(2018)108

Povezanost rada

Fizika

Poveznice
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