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NRQCD Confronts LHCb Data on Quarkonium Production within Jets.

Publication ,  Journal Article
Bain, R; Makris, Y; Mehen, T; Dai, L; Leibovich, AK
Published in: Physical review letters
July 2017

We analyze the recent LHCb measurement of the distribution of the fraction of the transverse momentum, z(J/ψ), carried by the J/ψ within a jet. LHCb data are compared with analytic calculations using the fragmenting jet function (FJF) formalism for studying J/ψ in jets. Logarithms in the FJFs are resummed using Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution. We also convolve hard QCD partonic cross sections, showered with pythia, with leading order nonrelativistic quantum chromodynamics (NRQCD) fragmentation functions and obtain consistent results. Both approaches use madgraph to calculate the hard process that creates the jet initiating parton. These calculations give reasonable agreement with the z(J/ψ) distribution that was shown to be poorly described by default pythia simulations in the LHCb paper. We compare our predictions for the J/ψ distribution using various extractions of nonperturbative NRQCD long-distance matrix elements (LDMEs) in the literature. NRQCD calculations agree with LHCb data better than default pythia regardless of which fit to the LDMEs is used. LDMEs from fits that focus exclusively on high transverse momentum data from colliders are in good agreement with the LHCb measurement.

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Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

July 2017

Volume

119

Issue

3

Start / End Page

032002

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

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Bain, R., Makris, Y., Mehen, T., Dai, L., & Leibovich, A. K. (2017). NRQCD Confronts LHCb Data on Quarkonium Production within Jets. Physical Review Letters, 119(3), 032002. https://doi.org/10.1103/physrevlett.119.032002
Bain, Reggie, Yiannis Makris, Thomas Mehen, Lin Dai, and Adam K. Leibovich. “NRQCD Confronts LHCb Data on Quarkonium Production within Jets.Physical Review Letters 119, no. 3 (July 2017): 032002. https://doi.org/10.1103/physrevlett.119.032002.
Bain R, Makris Y, Mehen T, Dai L, Leibovich AK. NRQCD Confronts LHCb Data on Quarkonium Production within Jets. Physical review letters. 2017 Jul;119(3):032002.
Bain, Reggie, et al. “NRQCD Confronts LHCb Data on Quarkonium Production within Jets.Physical Review Letters, vol. 119, no. 3, July 2017, p. 032002. Epmc, doi:10.1103/physrevlett.119.032002.
Bain R, Makris Y, Mehen T, Dai L, Leibovich AK. NRQCD Confronts LHCb Data on Quarkonium Production within Jets. Physical review letters. 2017 Jul;119(3):032002.

Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

July 2017

Volume

119

Issue

3

Start / End Page

032002

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences