Soft double-diffractive Higgs boson production at hadron colliders

Abstract

We evaluate the non-perturbative contribution to the double-diffractive production of the Higgs boson, which arises due to the QCD scale anomaly if the mass of the Higgs M H is smaller than the mass of the top quark M T , M H < M T . The cross section appears to be larger than expected from perturbative calculations; we find σ H = 0.019 ÷ 0.14 pbarn at the Tevatron energy, and σ H = 0.01 ÷ 0.27 pbarn at the energy of the LHC. *

Elliptic flow from minijet production in heavy ion collisions

“…These gluon distributions are characterized by the saturation scale Q s ≫ Λ QCD which insures applicability of small coupling approaches down to rather small transverse momenta of the produced particles. Our model of course does not yield us the exact two-particle production cross section, but gives a realistic approximation similar to the one used in [12,13] to describe the multiplicity distributions at RHIC. An exact calculation of double inclusive minijet production in the quasi-classical framework appears to be rather complicated and is left for further research: even the single inclusive cross section has not been yet unambiguously theoretically determined, despite the extensive efforts [7,8].…”

“…While being coherent over large longitudinal distances these quasi-classical fields have a rather short coherence length in the transverse direction, of the order of the inverse saturation scale 1/Q s . Saturation-inspired models have been quite successful in describing the emerging RHIC data on rapidity and centrality dependence of the total charged multiplicity of the produced particles [12,13].…”

Unintegrated parton distributions and pion production in pp collisions at RHIC energies

“…In the k t -factorization approach usually the gg → g fusion mechanism is included only [14]. In Ref.…”

“…[14] it was assumed, based on the concept of local parton-hadron duality, that the rapidity distribution of particles is identical to the rapidity distribution of gluons. In the present approach we follow a different approach which makes use of phenomenological fragmentation functions (FF's).…”

“…The k t -factorization approach was used recently to study both the rapidity and transverse momentum distributions of particles produced at RHIC energies [14,15] with only gluon degrees of freedom taken into account. Recently we have supplemented the mechanisms including the gluon degrees of freedom with mechanisms including the quark degrees of freedom [13].…”