TY  - EJOUR
AU  - Bagnaschi, Emanuele
AU  - Harlander, Robert V.
AU  - Mantler, Hendrik
AU  - Vicini, Alessandro
AU  - Wiesemann, Marius
TI  - Resummation ambiguities in the Higgs transverse-momentum spectrum in the Standard Model and beyond
IS  - CERN-PH-TH-2015-242
M1  - PUBDB-2015-04815
M1  - CERN-PH-TH-2015-242
M1  - KA-TP-20-2015
M1  - MCNET-15-21
M1  - DESY-15-155
M1  - --TIF-UNIMI-2015-7
M1  - WUB-15-06
M1  - ZU-TH-31-15
M1  - arXiv:1510.08850
PY  - 2015
AB  - 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. 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-pT region, they exhibit sizable differences at large pT. We show that these differences can be significantly reduced by suitable modifications of formally subleading terms in the Monte Carlo implementations. We apply 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 strength.
KW  - standard model (INSPIRE)
KW  - new physics (INSPIRE)
KW  - gluon: fusion (INSPIRE)
KW  - Higgs particle: production (INSPIRE)
KW  - Higgs particle: doublet: 2 (INSPIRE)
KW  - Higgs particle: transverse momentum (INSPIRE)
KW  - transverse momentum: momentum spectrum: calculated (INSPIRE)
KW  - numerical calculations: Monte Carlo (INSPIRE)
LB  - PUB:(DE-HGF)25 ; PUB:(DE-HGF)29
UR  - https://bib-pubdb1.desy.de/record/288103
ER  -