Higgs production in bottom-quark fusion: Matching beyond leading order

Forte, Stefano; Napoletano, Davide; Ubiali, Maria

doi:10.1016/j.physletb.2016.10.040

Cited by 67 publications

(99 citation statements)

References 37 publications

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“…of phenomenological applications [33][34][35][36][37][38][39] and in studies on the rationale behind the choice of either scheme [42][43][44][45].…”

Section: Jhep04(2018)046mentioning

confidence: 99%

Heavy-flavor parton distributions without heavy-flavor matching prescriptions

Bertone

Glazov

Mitov

et al. 2018

J. High Energ. Phys.

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Abstract:We show that the well-known obstacle for working with the zero-mass variable flavor number scheme, namely, the omission of O(1) mass power corrections close to the conventional heavy flavor matching point (HFMP) µ b = m, can be easily overcome. For this it is sufficient to take advantage of the freedom in choosing the position of the HFMP. We demonstrate that by choosing a sufficiently large HFMP, which could be as large as 10 times the mass of the heavy quark, one can achieve the following improvements: 1) above the HFMP the size of missing power corrections O(m) is restricted by the value of µ b and, therefore, the error associated with their omission can be made negligible; 2) additional prescriptions for the definition of cross-sections are not required; 3) the resummation accuracy is maintained and 4) contrary to the common lore we find that the discontinuity of α s and pdfs across thresholds leads to improved continuity in predictions for observables. We have considered a large set of proton-proton and electron-proton collider processes, many through NNLO QCD, that demonstrate the broad applicability of our proposal.

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“…of phenomenological applications [33][34][35][36][37][38][39] and in studies on the rationale behind the choice of either scheme [42][43][44][45].…”

Section: Jhep04(2018)046mentioning

confidence: 99%

Heavy-flavor parton distributions without heavy-flavor matching prescriptions

Bertone

Glazov

Mitov

et al. 2018

J. High Energ. Phys.

Self Cite

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“…This has been done at NLO+NNLL accuracy using the FONLL [2,3,7,8] method and a method based on EFT [9,10], and both methods have been found to agree. Results obtained in the FONLL approach are shown in Fig.…”

Section: Resummation Vs Mass Effectsmentioning

confidence: 97%

“…In this study we reconsider these differences. Firstly we examine the origin of the difference at the inclusive level in the case of Higgs production in bottom-quark fusion [2,3]. Secondly we set-up the two schemes in such a way that they can be compared likes with likes in differential distributions [1].…”

Section: F or 5f Scheme?mentioning

confidence: 99%

“…The diagrams circled with a dashed line become massive in FONLL-A, while those circled with a solid pink line are those that must be additionally subtracted in the FONLL-B scheme. For details on the definition of the two schemes see [2,3] jet flavour, a jet cut of Q cut = 10 GeV is used in the Z case while Q cut = 20 GeV is employed in H-boson production.…”

Section: Pos(dis2017)172mentioning

confidence: 99%

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Bottom-quark mass effects in associated production with Z and H bosons

Napoletano¹,

Krauss²,

Schumann³

2017

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

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In this study, predictions obtained in the four and in the five flavour schemes are compared for two important processes involving heavy flavours at the LHC: the production of a Z or a Higgs boson in association with b quarks. In particular we obtain predictions with SHERPA's MC@NLO implementation for the four-flavour scheme, treating the b's as massive, and with multijet merging at leading and next-to leading order for the five-flavour scheme. While differences between the two schemes, at the inclusive level, are well understood from resummation of possibly large logs into the b-PDFs, differences in shape present a major problem for experimental measurements. We make use of data for Z +b(b) production at the 7 TeV LHC to exhibit strengths and weaknesses of the different approaches and we use these results to validate predictions for b-associated Higgs-boson production at the 13 TeV Run II.

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“…The FONLL scheme, first proposed for the transverse momentum spectrum of bottom quarks produced in hadronic collisions [35], has the advantage of being universally applicable and of allowing one to combine 4FS and 5FS calculations performed at any perturbative order. The formulation of the FONLL scheme has been extended to deep-inelastic scattering (DIS) [36] and adapted to the computation of the total cross section for Higgs and Z production in bottom-quark fusion [37][38][39]. Various recent attempts to consistently include both the resummation of initial-state collinear logarithms and mass effects also for differential and parton-shower matched observables have been recently put forward, see for example the five-flavour-massive scheme proposed in [16,40] or a similar approach based on multi-jet merging [41].…”

Section: Introductionmentioning

confidence: 99%

A fragmentation-based study of heavy quark production

Ridolfi

Ubiali

Zaro

2020

J. High Energ. Phys.

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Processes involving heavy quarks are a crucial component of the LHC physics program, both by themselves and as backgrounds for Higgs physics and new physics searches. In this work, we critically reconsider the validity of the widely-adopted approximation in which heavy quarks are generated at the matrix-element level, with special emphasis on the impact of the collinear logarithms associated with final-state heavy quark and gluon splittings. Our study, based on a perturbative fragmentation-function approach, explicitly shows that neglecting the resummation of collinear logarithms may yield inaccurate predictions, in particular when observables exclusive in the heavy quark degrees of freedom are considered. Our findings motivate the use of schemes which encompass the resummation of final-state collinear logarithms.

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Higgs production in bottom-quark fusion: Matching beyond leading order

Cited by 67 publications

References 37 publications

Heavy-flavor parton distributions without heavy-flavor matching prescriptions

Heavy-flavor parton distributions without heavy-flavor matching prescriptions

Bottom-quark mass effects in associated production with Z and H bosons

A fragmentation-based study of heavy quark production

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