Pinning down the linearly-polarised gluons inside unpolarised protons using quarkonium-pair production at the LHC

Jean-Philippe Lansberg*, Cristian Pisano, Florent Scarpa, Marc Schlegel

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We show that the production of J/psi or Upsilon pairs in unpolarised pp collisions is currently the best process to measure the momentum distribution of linearly-polarised gluons inside unpolarised protons through the study of azimuthal asymmetries. Not only the short-distance coefficients for such reactions induce the largest possible cos4 phi modulations, but analysed data are already available. Among the various final states previously studied in unpolarised pp collisions within the TMD approach, di-J/psi production exhibits by far the largest asymmetries, in the region studied by the ATLAS and CMS experiments. In addition, we use the very recent LHCb data at 13 TeV to perform the first fit of the unpolarised transverse-momentum-dependent gluon distribution. (c) 2018 The Author(s). Published by Elsevier B.V.

Original languageEnglish
Pages (from-to)217-222
Number of pages6
JournalPhysics Letters B
Volume784
DOIs
Publication statusPublished - 10-Sep-2018

Keywords

  • DOUBLE PARTON SCATTERING
  • PSI-PSI-PRODUCTION
  • PP COLLISIONS
  • SINGLE-SPIN
  • HADRONIC PRODUCTION
  • MESON PRODUCTION
  • DRELL-YAN
  • J/PSI
  • ASYMMETRIES
  • COLLIDER

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