Towards the global fit of the TMD gluon density in the proton from the LHC data

A. V. Lipatov; G. I. Lykasov; M. A. Malyshev

doi:10.1103/PhysRevD.107.014022

paper

Towards the global fit of the TMD gluon density in the proton from the LHC data

arXiv:2211.03727 · doi:10.1103/PhysRevD.107.014022

Abstract

We propose a new analytical expression for the Transverse Momentum Dependent (TMD, or unintegrated) gluon density in the proton. Essential phenomenological parameters are extracted from the LHC data on inclusive hadron production in $pp$ collisions at low transverse momenta, $p_{T} \sim 1$ ~GeV. The latter are described in the framework of modified soft quark-gluon string model, where gluonic state and non-zero transverse momentum of partons inside the proton are taken into account. To determine the parameters important at moderate and large $x$ we used measurements of inclusive $b$ -jet and Higgs boson production at the LHC as well as latest HERA data on proton structure functions $F_{2}^{c} (x, Q^{2})$ and $F_{2}^{b} (x, Q^{2})$ and reduced cross sections $σ_{red}^{c} (x, Q^{2})$ and $σ_{red}^{b} (x, Q^{2})$ . The Catani-Ciafaloni-Fiorani-Marchesini evolution equation is applied to extend the initial gluon distribution into the whole kinematical region. We have achieved simultaneous description of all considered processes with $χ^{2} / d . o . f . = 2.2$ , thus moving forward to the global fit of TMD gluon density from collider data. The obtained TMD gluon distribution in a proton is available for public usage and implemented into the TMDlib package and Monte-Carlo event generator PEGASUS.

arXiv comment26 pages, 11 figures

Towards the global fit of the TMD gluon density in the proton from the LHC data

Abstract

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