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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

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

Author

  • S Acharya
  • F. T. Acosta
  • D. Adamova
  • Jonatan Adolfsson
  • M.M Aggarwal
  • G Aglieri Rinella
  • Peter Christiansen
  • Martin Ljunggren
  • Anders Oskarsson
  • Tuva Richert
  • David Silvermyr
  • Evert Stenlund
  • Vytautas Vislavicius
Show all

Summary, in English

The pT-differential production cross section of prompt Λc + 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 Λc + and Λ¯ c ¯ were reconstructed in the hadronic decay modes Λc + → pK−π+, Λc + → pKS 0 and in the semileptonic channel Λc + → e+νeΛ (and charge conjugates). The measured values of the Λc +/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 Λc + 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 Λc + 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.[Figure not available: see fulltext.] © 2018, The Author(s).

Department/s

  • Particle and nuclear physics
  • eSSENCE: The e-Science Collaboration
  • Department of Physics

Publishing year

2018-04-01

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2018

Issue

4

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • Heavy Ion Experiments
  • Quark gluon plasma

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479