Abstract
We consider the transverse-momentum distribution of a Higgs boson produced through gluon fusion in hadron collisions. At small transverse momenta, the large logarithmic terms are resummed up to next-to-leading-logarithmic (NLL) accuracy. The resummed computation is consistently matched to the next-to-leading-order (NLO) result valid at large transverse momenta. The ensuing Standard Model prediction is supplemented by possible new-physics effects parametrised through three dimension-six operators related to the modification of the top and bottom Yukawa couplings, and to the inclusion of a point-like Higgs-gluon coupling, respectively. We present resummed transverse-momentum spectra including the effect of these operators at NLL+NLO accuracy and study their impact on the shape of the distribution. We find that such modifications, while affecting the total rate within the current uncertainties, can lead to significant distortions of the spectrum. The proper parametrization of such effects becomes increasingly important for experimental analyses in Run II of the LHC.
Highlights
In the low-pT region, the convergence of the perturbative expansion is spoiled by the presence of large logarithmic terms of the form αSn lnm(m2H /p2T )
The ensuing Standard Model prediction is supplemented by possible new-physics effects parametrised through three dimension-six operators related to the modification of the top and bottom Yukawa couplings, and to the inclusion of a point-like Higgs-gluon coupling, respectively
Standard Model Effective Field Theory (SMEFT) offers a formalism for the parametrization of high-scale beyond the SM (BSM) effects, which can be used for this purpose
Summary
Where the SM is supplemented by the inclusion of a set of dimension-six operators describing new physics effects at a scale Λ well above the electroweak scale. These operators, in the case of single Higgs production, may be expanded as: c1 Λ2. The operator O1 corresponds to a contact interaction between the Higgs boson and gluons with the same structure as in the heavy-top limit of the SM. The coefficient ctg, instead, is constrained by top pair production [115]. We consider the contribution of the effective operators in eqs. The contribution of the chromomagnetic operator to the function F (τ ) has been addressed in the literature with contradicting results [116, 117] Focusing on the impact of ct and cg, we note that the total cross section alone does not allow us to disentangle the coefficients cg and ct:. As already noted in the literature [99], the transverse momentum spectrum allows us to break this degeneracy
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
