Abstract
We investigate the inclusive Higgs boson production in proton–proton collisions at high energies in the framework of kT-factorization QCD approach. The attention is focused on the dominant off-shell gluon–gluon fusion subprocess g⁎g⁎→H→γγ, where the transverse momentum of incoming gluons are taken into account. The transverse momentum dependent (or unintegrated) gluon densities of the proton are determined using the CCFM evolution equation as well as the Kimber–Martin–Ryskin prescription. We study the theoretical uncertainties of our calculations and perform the comparison with the results of traditional pQCD evaluations. Our predictions agree well with the first experimental data taken by the ATLAS Collaboration at the LHC. We argue that further studies of the Higgs boson production are capable of constraining the unintegrated gluon densities of the proton.
Highlights
In 2012, during the search for the SM Higgs boson at the LHC, the CMS and ATLAS collaborations observed a new particle [1, 2], undiscovered before
The distributions on the diphoton transverse momentum pγTγ, rapidity |yγγ| and helicity angle | cos θ∗| have been presented1. These observables describe the fundamental kinematic properties of the discovered Higgs particle, probe its spin and test the corresponding theoretical calculations within the QCD, which are performed for basic gluon-gluon fusion subprocess gg → H [5,6,7,8,9,10] at next-to-next-to-leading order (NNLO) [10,11,12,13,14,15] and matched with soft-gluon resummation carried out up to next-to-next-to-leading logarithmic accuracy (NNLL) [16, 17]
In the present note we analyse recent ATLAS data using the kT -factorization QCD approach [18,19]. This approach is based on the Balitsky-Fadin-Kuraev-Lipatov (BFKL) [20] or Ciafaloni-Catani-Fiorani-Marchesini (CCFM) [21] gluon evolution equations and provides solid theoretical grounds for the effects of initial gluon radiation and intrinsic gluon transverse momentum
Summary
In 2012, during the search for the SM Higgs boson at the LHC, the CMS and ATLAS collaborations observed a new particle [1, 2], undiscovered before. The kT -factorization formalism has been applied [23,24,25,26] to calculate transverse momentum distribution of the inclusive Higgs boson production. The effective Lagrangian [27, 28] for the Higgs boson coupling to gluons (valid in the large top quark mass limit) has been used to calculate the amplitude of basic gluon-gluon fusion subprocess.
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