Improved constraints on parton distributions using LHCb, ALICE and HERA heavy-flavour measurements and implications for the predictions for prompt atmospheric-neutrino fluxes

Zenaiev, O.; Garzelli, Maria Vittoria; Lipka, K.; Moch, S.; Cooper‐Sarkar, A. M.; Olness, Fred; Geiser, A.; Sigl, Günter

doi:10.1007/jhep04(2020)118

Cited by 48 publications

(92 citation statements)

References 94 publications

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“…Our findings at NLO support the use of masses renormalized in the MS scheme for further fits of this kind (see e.g. [55,56]). We also show for the first time how LHC charm production data extrapolated to the full phase-space can be used to constrain NNLO PDF fits, suggesting a reduction of the uncertainties in the gluon distributions of various widely used global PDF fits [57][58][59].…”

Section: Introductionsupporting

confidence: 83%

Heavy-flavor hadro-production with heavy-quark masses renormalized in the $$ \overline{\mathrm{MS}} $$, MSR and on-shell schemes

Garzelli¹,

Kemmler²,

Moch³

et al. 2021

J. High Energ. Phys.

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We present predictions for heavy-quark production at the Large Hadron Collider making use of the $$ \overline{\mathrm{MS}} $$ MS ¯ and MSR renormalization schemes for the heavy-quark mass as alternatives to the widely used on-shell renormalization scheme. We compute single and double differential distributions including QCD corrections at next-to-leading order and investigate the renormalization and factorization scale dependence as well as the perturbative convergence in these mass renormalization schemes. The implementation is based on publicly available programs, MCFM and xFitter, extending their capabilities. Our results are applied to extract the top-quark mass using measurements of the total and differential $$ t\overline{t} $$ t t ¯ production cross-sections and to investigate constraints on parton distribution functions, especially on the gluon distribution at low x values, from available LHC data on heavy-flavor hadro-production.

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Section: Introductionsupporting

confidence: 83%

Heavy-flavor hadro-production with heavy-quark masses renormalized in the $$ \overline{\mathrm{MS}} $$, MSR and on-shell schemes

Garzelli¹,

Kemmler²,

Moch³

et al. 2021

J. High Energ. Phys.

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“…We expect that the large scale uncertainties here dominate the uncertainties at even higher rapidity. PDF uncertainties are typically smaller than the scale uncertainties for forward charm production at these energies [50]. Results for the p T and y distributions, in similar agreement with the LHCb data, are obtained for D ± and D 0 ,D 0 production, used below as sources of ν µ +ν µ and ν e +ν e .…”

Section: Jhep06(2020)032supporting

confidence: 73%

“…[92,93]). In another arena, predictions of the prompt atmospheric neutrino flux [49,50,61,[94][95][96] will also be constrained by measurements of the tau neutrino energy spectrum in the far-forward region at the LHC.…”

Section: Discussionmentioning

confidence: 99%

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Far-forward neutrinos at the Large Hadron Collider

Bai

Diwan

Garzelli

et al. 2020

J. High Energ. Phys.

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We present a new calculation of the energy distribution of high-energy neutrinos from the decay of charm and bottom hadrons produced at the Large Hadron Collider (LHC). In the kinematical region of very forward rapidities, heavy-flavor production and decay is a source of tau neutrinos that leads to thousands of charged-current tau neutrino events in a 1 m long, 1 m radius lead neutrino detector at a distance of 480 m from the interaction region. In our computation, next-to-leading order QCD radiative corrections are accounted for in the production cross-sections. Non-perturbative intrinsic-k T effects are approximated by a simple phenomenological model introducing a Gaussian k T-smearing of the parton distribution functions, which might also mimic perturbative effects due to multiple initial-state soft-gluon emissions. The transition from partonic to hadronic states is described by phenomenological fragmentation functions. To study the effect of various input parameters, theoretical predictions for D ± s production are compared with LHCb data on double-differential cross-sections in transverse momentum and rapidity. The uncertainties related to the choice of the input parameter values, ultimately affecting the predictions of the tau neutrino event distributions, are discussed. We consider a 3+1 neutrino mixing scenario to illustrate the potential for a neutrino experiment to constrain the 3+1 parameter space using tau neutrinos and antineutrinos. We find large theoretical uncertainties in the predictions of the neutrino fluxes in the far-forward region. Untangling the effects of tau neutrino oscillations into sterile neutrinos and distinguishing a 3+1 scenario from the standard scenario with three active neutrino flavours, will be challenging due to the large theoretical uncertainties from QCD.

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“…If an improved description of the p T distributions will be obtained, then absolute differential cross-sections in p T , besides rapidity distributions for each fixed p T bin, could be used for fitting the PDF parameters. If predictions with a reduced scale uncertainty band become available, then PDF fits using absolute data (instead of ratios) can be performed with reduced uncertainty and improved constraints on the heavy-quark masses too, whose values can also be fitted together with the PDF parameters [27].…”

Section: Implications For Pdf Fitsmentioning

confidence: 99%