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

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

We show that the production of J/ψ or ϒ 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 reaction...

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Main Authors: Jean-Philippe Lansberg, Cristian Pisano, Florent Scarpa, Marc Schlegel
Format: Article
Language:English
Published: Elsevier 2018-09-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269318306075
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spelling doaj-8f3976c2a20a4f0bb425ac0286ccfba62020-11-24T21:42:10ZengElsevierPhysics Letters B0370-26932018-09-01784217222Pinning down the linearly-polarised gluons inside unpolarised protons using quarkonium-pair production at the LHCJean-Philippe Lansberg0Cristian Pisano1Florent Scarpa2Marc Schlegel3IPNO, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France; Corresponding author.Dipartimento di Fisica, Università di Pavia, and INFN, Sezione di Pavia Via Bassi 6, I-27100 Pavia, Italy; Dipartimento di Fisica, Università di Cagliari, and INFN, Sezione di Cagliari Cittadella Universitaria, I-09042 Monserrato (CA), ItalyIPNO, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France; Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the NetherlandsInstitute for Theoretical Physics, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany; Department of Physics, New Mexico State University, Las Cruces, NM 88003, USAWe show that the production of J/ψ or ϒ 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 cos⁡4ϕ modulations, but analysed data are already available. Among the various final states previously studied in unpolarised pp collisions within the TMD approach, di-J/ψ 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.http://www.sciencedirect.com/science/article/pii/S0370269318306075
collection DOAJ
language English
format Article
sources DOAJ
author Jean-Philippe Lansberg
Cristian Pisano
Florent Scarpa
Marc Schlegel
spellingShingle Jean-Philippe Lansberg
Cristian Pisano
Florent Scarpa
Marc Schlegel
Pinning down the linearly-polarised gluons inside unpolarised protons using quarkonium-pair production at the LHC
Physics Letters B
author_facet Jean-Philippe Lansberg
Cristian Pisano
Florent Scarpa
Marc Schlegel
author_sort Jean-Philippe Lansberg
title Pinning down the linearly-polarised gluons inside unpolarised protons using quarkonium-pair production at the LHC
title_short Pinning down the linearly-polarised gluons inside unpolarised protons using quarkonium-pair production at the LHC
title_full Pinning down the linearly-polarised gluons inside unpolarised protons using quarkonium-pair production at the LHC
title_fullStr Pinning down the linearly-polarised gluons inside unpolarised protons using quarkonium-pair production at the LHC
title_full_unstemmed Pinning down the linearly-polarised gluons inside unpolarised protons using quarkonium-pair production at the LHC
title_sort pinning down the linearly-polarised gluons inside unpolarised protons using quarkonium-pair production at the lhc
publisher Elsevier
series Physics Letters B
issn 0370-2693
publishDate 2018-09-01
description We show that the production of J/ψ or ϒ 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 cos⁡4ϕ modulations, but analysed data are already available. Among the various final states previously studied in unpolarised pp collisions within the TMD approach, di-J/ψ 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.
url http://www.sciencedirect.com/science/article/pii/S0370269318306075
work_keys_str_mv AT jeanphilippelansberg pinningdownthelinearlypolarisedgluonsinsideunpolarisedprotonsusingquarkoniumpairproductionatthelhc
AT cristianpisano pinningdownthelinearlypolarisedgluonsinsideunpolarisedprotonsusingquarkoniumpairproductionatthelhc
AT florentscarpa pinningdownthelinearlypolarisedgluonsinsideunpolarisedprotonsusingquarkoniumpairproductionatthelhc
AT marcschlegel pinningdownthelinearlypolarisedgluonsinsideunpolarisedprotonsusingquarkoniumpairproductionatthelhc
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