Advanced

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

, ; Acharya, S; Acosta, F. T.; Adamova, D.; Adolfsson, Jonatan LU ; Aggarwal, M.M; Aglieri Rinella, G; Christiansen, Peter LU ; Ljunggren, Martin LU and Oskarsson, Anders LU , et al. (2018) In Journal of High Energy Physics 2018(4).
Abstract
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... (More)
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). (Less)
Please use this url to cite or link to this publication:
author
, et al. (More)
(Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Heavy Ion Experiments, Quark gluon plasma
in
Journal of High Energy Physics
volume
2018
issue
4
publisher
Springer
external identifiers
  • scopus:85048630586
ISSN
1126-6708
DOI
10.1007/JHEP04(2018)108
language
English
LU publication?
yes
id
ea181354-6e68-47b4-b4df-d971714307d0
alternative location
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85048630586&doi=10.1007%2fJHEP04%282018%29108&partnerID=40&md5=8af7564cb67b57f4aa70804f4db96962
date added to LUP
2018-07-02 10:29:30
date last changed
2018-10-03 09:32:48
@article{ea181354-6e68-47b4-b4df-d971714307d0,
  abstract     = {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).},
  articleno    = {2018:108},
  author       = {,  and Acharya, S and Acosta, F. T. and Adamova, D. and Adolfsson, Jonatan and Aggarwal, M.M and Aglieri Rinella, G and Christiansen, Peter and Ljunggren, Martin and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas},
  issn         = {1126-6708},
  keyword      = {Heavy Ion Experiments,Quark gluon plasma},
  language     = {eng},
  month        = {04},
  number       = {4},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Λ c + production in pp collisions at √s=7 TeV and in p-Pb collisions at √sNN=5.02 TeV},
  url          = {http://dx.doi.org/10.1007/JHEP04(2018)108},
  volume       = {2018},
  year         = {2018},
}