Heavy meson hadroproduction:open issues

Garzelli, Maria Vittoria; Alekhin, S.; Benzke, Michael; Kniehl, Bernd A.; Moch, S.; Zenaiev, O.

doi:10.22323/1.375.0048

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…[17][18][19][20][21][22]). The transition from quarks to hadrons is described either by fragmentation functions (FFs) [23][24][25], or by matching NLO matrix elements to parton shower and hadronization approaches [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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.

View full text Add to dashboard Cite

show abstract

“…[16][17][18][19][20][21]). The transition from quarks to hadrons is described either by fragmentation functions (FFs) [22][23][24], or by matching NLO matrix elements to parton shower and hadronization approaches [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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

Garzelli,

Kemmler,

Moch

et al. 2020

Preprint

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We present predictions for heavy-quark production at the Large Hadron Collider making use of the 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 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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“…The inclusive open heavy flavour meson production at the LHC was studied differentially both in collinear [16][17][18][19][20] and k T -factorization approaches [21][22][23][24][25][26][27] as well as in the dipole model [19,28]. The inclusive distributions describe the experimental ones within theoretical uncertainties (choice of the heavy quark mass, choice of renormalization and factorization scales and choice of parton distributions).…”

Section: Introductionmentioning

confidence: 99%

Production of forward heavy-flavour dijets at the LHCb within $k_{T}$-factorization approach

Maciula,

Pasechnik,

Szczurek

2022

Preprint

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We calculate differential cross sections for c cand b b-dijet production in pp-scattering at √ s =13 TeV in the k T -factorization and hybrid approaches with different unintegrated parton distribution functions (uPDFs). We present distributions in transverse momentum and pseudorapidity of the leading jet, rapidity difference between the jets and the dijet invariant mass. Our results are compared to recent LHCb data on forward production of heavy flavour dijets, measured recently for the first time individually for both, charm and bottom flavours. We found that an agreement between the predictions and the data within the full k T -factorization is strongly related to the modelling of the large-x behaviour of the gluon uPDFs which is usually not well constrained. The problem may be avoided following the hybrid factorization approach. Then a good description of the measured distributions is obtained with the Parton-Branching, the Kimber-Martin-Ryskin, the Kutak-Sapeta and the Jung setA0 CCFM gluon uPDFs. We calculate also differential distributions for the ratio of c c and b b cross sections. In all cases we obtain the ratio close to 1 which is caused by the condition on minimal jet transverse momentum (p jet T > 20 GeV) introduced in the experiment, that makes the role of heavy quark mass almost negligible. The LHCb experimental ratio seems a bit larger. We discuss potentially important for the ratio effect of c-or b-quark gluon radiative corrections related to emission outside of the jet cone. The found effect seems rather small. More refine calculation requires full simulation of c-and b-jets which goes beyond of the scope of the present paper.

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Heavy meson hadroproduction:open issues

Cited by 3 publications

References 29 publications

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

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

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

Production of forward heavy-flavour dijets at the LHCb within $k_{T}$-factorization approach

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