Precision Determination of the Small-
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 Gluon from Charm Production at LHCb

Gauld, R.; Rojo, Juan

doi:10.1103/physrevlett.118.072001

Cited by 98 publications

(123 citation statements)

References 56 publications

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“…However, some progress has recently been made in this direction. For example, the cross-section ratios of open-heavy-flavour production data from LHCb have been used to constrain the small-x gluon density in proton PDFs [31].…”

Section: Introductionmentioning

confidence: 99%

Towards an automated tool to evaluate the impact of the nuclear modification of the gluon density on quarkonium, D and B meson production in proton–nucleus collisions

2016

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We propose a simple and model-independent procedure to account for the impact of the nuclear modification of the gluon density as encoded in nuclear collinear PDF sets on two-to-two partonic hard processes in protonnucleus collisions. This applies to a good approximation to quarkonium, D and B meson production, generically referred to H. Our procedure consists in parametrising the square of the parton scattering amplitude, A gg→HX and constraining it from the proton-proton data. Doing so, we have been able to compute the corresponding nuclear modification factors for J/ψ, ϒ and D 0 as a function of y and P T at √ s NN = 5 and 8 TeV in the kinematics of the various LHC experiments in a model independent way. It is of course justified since the most important ingredient in such evaluations is the probability of each kinematical configuration. Our computations for D mesons can also be extended to B meson production. To further illustrate the potentiality of the tool, we provide -for the first time -predictions for the nuclear modification factor for η c production in pPb collisions at the LHC.

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Section: Introductionmentioning

confidence: 99%

Towards an automated tool to evaluate the impact of the nuclear modification of the gluon density on quarkonium, D and B meson production in proton–nucleus collisions

2016

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“…As demonstrated in [14], the combination of LHCb charm production data at √ s = 5, 7 and 13 TeV leads to a…”

Section: Pos(dis2017)198mentioning

confidence: 86%

Improving quark flavor separation with forward W and Z production at LHCb

Rojo¹

2017

Proceedings of XXV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2017)

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We quantify the constraints on the flavour separation between the quarks and antiquarks in the proton provided by the recent forward weak gauge boson production data from the LHCb experiment at √ s = 7 and 8 TeV. Performed in the framework of the NNPDF3.1 global analysis, this study highlights the key role that the LHCb W and Z data have in achieving a robust quark flavor separation in the large-x region, including the strange and charm quarks. We demonstrate how the LHCb measurements lead to improved determinations of the the up and down quark PDFs in the region x ∼ > 0.1, with an uncertainty reduction that can be as large as a factor 2. We also show how the LHCb forward measurements severely restrict the size of the fitted charm PDF at large x, imposing stringent constraints on non-perturbative models for the charm content of the nucleon.

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“…In Figure 5 (right panel) we display our fit alongside a gluon obtained by reweighting a global fit to include the forward charm data [23]. The forward charm data fit appears to prefer a significantly reduced and flatter gluon at small x.…”

Section: Pos(dis2017)032mentioning

confidence: 99%

Probing the Low x Gluon with Exclusive $J/\psi$ Production

Jones

Martin

Ryskin³

et al. 2017

Proceedings of XXV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2017)

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We present an updated and improved extraction of the low-x gluon distribution from the HERA and LHCb exclusive J/ψ production data in the context of k T factorisation. Critically, we use a more precise expression for the photon flux and updated rapidity gap survival factors. In collinear factorisation, exclusive J/ψ photoproduction receives large perturbative corrections at next-to-leading order which depend sensitively on the factorisation scale. This prevents the use of the available data to extract a gluon PDF within this framework. Attempts to understand and overcome the problems caused by the large perturbative corrections are discussed.

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Precision Determination of the Small- x Gluon from Charm Production at LHCb

Cited by 98 publications

References 56 publications

Towards an automated tool to evaluate the impact of the nuclear modification of the gluon density on quarkonium, D and B meson production in proton–nucleus collisions

Towards an automated tool to evaluate the impact of the nuclear modification of the gluon density on quarkonium, D and B meson production in proton–nucleus collisions

Improving quark flavor separation with forward W and Z production at LHCb

Probing the Low x Gluon with Exclusive $J/\psi$ Production

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