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

The ALICE collaboration

Research output: Contribution to journalArticle

10 Citations (Scopus)

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 + → pKπ+, 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.]

Original languageEnglish (US)
Article number108
JournalJournal of High Energy Physics
Volume2018
Issue number4
DOIs
StatePublished - Apr 1 2018

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baryons
collisions
quantum chromodynamics
quarks
center of mass
unity
fragmentation
generators
mesons
intervals
detectors
cross sections
decay
interactions
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Λ c + production in pp collisions at √s=7 TeV and in p-Pb collisions at √sNN=5.02 TeV. / The ALICE collaboration.

In: Journal of High Energy Physics, Vol. 2018, No. 4, 108, 01.04.2018.

Research output: Contribution to journalArticle

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title = "Λ c + production in pp collisions at √s=7 TeV and in p-Pb collisions at √sNN=5.02 TeV",
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.]",
author = "{The ALICE collaboration} and S. Acharya and Acosta, {F. T.} and D. Adamov{\'a} and J. Adolfsson and Aggarwal, {M. M.} and {Aglieri Rinella}, G. and M. Agnello and N. Agrawal and Z. Ahammed and Ahn, {S. U.} and S. Aiola and A. Akindinov and M. Al-Turany and Alam, {S. N.} and Albuquerque, {D. S.D.} and D. Aleksandrov and B. Alessandro and {Alfaro Molina}, R. and Y. Ali and A. Alici and A. Alkin and J. Alme and T. Alt and L. Altenkamper and I. Altsybeev and C. Andrei and D. Andreou and Andrews, {H. A.} and A. Andronic and M. Angeletti and V. Anguelov and C. Anson and T. Antičić and F. Antinori and P. Antonioli and N. Apadula and L. Aphecetche and H. Appelsh{\"a}user and S. Arcelli and R. Arnaldi and Arnold, {O. W.} and Arsene, {I. C.} and M. Arslandok and B. Audurier and A. Augustinus and R. Averbeck and Azmi, {M. D.} and A. Badal{\`a} and Baek, {Y. W.} and Seger, {Janet E.}",
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T1 - Λ c + production in pp collisions at √s=7 TeV and in p-Pb collisions at √sNN=5.02 TeV

AU - The ALICE collaboration

AU - Acharya, S.

AU - Acosta, F. T.

AU - Adamová, D.

AU - Adolfsson, J.

AU - Aggarwal, M. M.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S. U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, S. N.

AU - Albuquerque, D. S.D.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfaro Molina, R.

AU - Ali, Y.

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Altenkamper, L.

AU - Altsybeev, I.

AU - Andrei, C.

AU - Andreou, D.

AU - Andrews, H. A.

AU - Andronic, A.

AU - Angeletti, M.

AU - Anguelov, V.

AU - Anson, C.

AU - Antičić, T.

AU - Antinori, F.

AU - Antonioli, P.

AU - Apadula, N.

AU - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arcelli, S.

AU - Arnaldi, R.

AU - Arnold, O. W.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Audurier, B.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Azmi, M. D.

AU - Badalà, A.

AU - Baek, Y. W.

AU - Seger, Janet E.

PY - 2018/4/1

Y1 - 2018/4/1

N2 - 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.]

AB - 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.]

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U2 - 10.1007/JHEP04(2018)108

DO - 10.1007/JHEP04(2018)108

M3 - Article

VL - 2018

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1126-6708

IS - 4

M1 - 108

ER -