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High Energy Physics - Phenomenology

arXiv:1610.09373 (hep-ph)
[Submitted on 28 Oct 2016 (v1), last revised 23 Jun 2017 (this version, v2)]

Title:Precision determination of the small-$x$ gluon from charm production at LHCb

Authors:Rhorry Gauld, Juan Rojo
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Abstract:The small-$x$ gluon in global fits of parton distributions is affected by large uncertainties from the lack of direct experimental constraints. In this work we provide a precision determination of the small-$x$ gluon from the exploitation of forward charm production data provided by LHCb for three different centre-of-mass (CoM) energies: 5~TeV, 7~TeV and 13~TeV. The LHCb measurements are included in the PDF fit by means of normalized distributions and cross-section ratios between data taken at different CoM values, $R_{13/7}$ and $R_{13/5}$. We demonstrate that forward charm production leads to a reduction of the PDF uncertainties of the gluon down to $x\simeq 10^{-6}$ by up to an order of magnitude, with implications for high-energy colliders, cosmic ray physics and neutrino astronomy.
Comments: 4 pages, 5 figures. Analysis updated to account for erratum in LHCb data - results qualitatively unchanged
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Report number: NIKHEF 2016-050
Cite as: arXiv:1610.09373 [hep-ph]
  (or arXiv:1610.09373v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1610.09373
Journal reference: Phys. Rev. Lett. 118, 072001 (2017)
Related DOI: https://doi.org/10.1103/PhysRevLett.118.072001

Submission history

From: Rhorry Gauld [view email]
[v1] Fri, 28 Oct 2016 20:00:00 UTC (41 KB)
[v2] Fri, 23 Jun 2017 10:45:20 UTC (41 KB)
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