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Production of Λc baryons at the LHC within the kT-factorization approach and independent parton fragmentation picture

Rafał Maciuła and Antoni Szczurek
Phys. Rev. D 98, 014016 – Published 12 July 2018

Abstract

We calculate the cross section for the production of D mesons and Λc baryons in proton-proton collisions at the LHC. The cross section for production of cc¯ pairs is calculated within the kT-factorization approach with the Kimber-Martin-Ryskin unintegrated gluon distributions obtained on the basis of modern collinear gluon distribution functions. We show that our approach well describes the D0, D+, and Ds experimental data. We try to understand recent ALICE and LHCb data for Λc production with the cΛc independent parton fragmentation approach. The Peterson fragmentation functions are used. The fcΛc fragmentation fraction and ϵcΛ parameter for cΛc are varied. As a control plot we show the transverse momentum distributions of different species of D mesons assuming standard values of the fcD fragmentation fractions known from the literature. Although one can agree with the ALICE data using the standard estimation of model uncertainties, one cannot describe simultaneously the ALICE and the LHCb data with the same set of parameters. The fraction fcΛc necessary to describe the ALICE data is much larger than the average value obtained from e+e or ep experiments. No drastic modification of the shape of the fragmentation function is allowed by the new ALICE and LHCb data for Λc production. We also discuss a possible dependence of the Λc/D0 baryon-to-meson ratio on rapidity and transverse momentum as recent observations by the ALICE and LHCb collaborations seem to suggest. Three different effects are considered: the value of the ϵcΛ parameter in the Peterson fragmentation function for cΛc, a kinematical effect related to the hadronization prescription, and a possible feed-down from higher charmed-baryon excitations. It seems very difficult, if not impossible, to understand the ALICE data within the considered independent parton fragmentation scheme.

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  • Received 5 April 2018

DOI:https://doi.org/10.1103/PhysRevD.98.014016

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Rafał Maciuła* and Antoni Szczurek

  • Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, PL-31-342 Kraków, Poland

  • *rafal.maciula@ifj.edu.pl
  • Also at University of Rzeszów, PL-35-959 Rzeszów, Poland; antoni.szczurek@ifj.edu.pl

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Vol. 98, Iss. 1 — 1 July 2018

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