Resummation ambiguities in the Higgs transverse-momentum spectrum in the Standard Model and beyond
Articolo
Data di Pubblicazione:
2016
Citazione:
Resummation ambiguities in the Higgs transverse-momentum spectrum in the Standard Model and beyond / E. Bagnaschi, R.V. Harlander, H. Mantler, A. Vicini, M. Wiesemann. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2016:1(2016 Jan), pp. 60.1-60.41.
Abstract:
We study the prediction for the Higgs transverse momentum distribution in gluon fusion and focus on the problem of matching fixed- and all-order perturbative results. The main sources of matching ambiguities on this distribution are investigated by means of a twofold comparison. On the one hand, we present a detailed qualitative and quantitative comparison of two recently introduced algorithms for determining the matching scale [1, 2]. On the other hand, we apply the results of both methods to three widely used approaches for the resummation of logarithmically enhanced contributions at small transverse momenta: the MC@NLO and POWHEG Monte Carlo approaches, and analytic resummation. While the three sets of results are largely compatible in the low-p⊥ region, they exhibit sizable differ- ences at large p⊥. We show that these differences can be significantly reduced by suitable modifications of formally subleading terms in the Monte Carlo implementations. We ap- ply our study to the Standard Model Higgs boson and to the neutral Higgs bosons of the Two-Higgs-Doublet Model for representative scenarios of the parameter space, where the top- and bottom-quark diagrams enter the cross section at different strengths.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Higgs Physics; Beyond Standard Model; Resummation; QCD
Elenco autori:
E. Bagnaschi, R.V. Harlander, H. Mantler, A. Vicini, M. Wiesemann
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