Diffractive production of heavy mesons at the LHC within $k_t$ - factorization approach

TL;DR

This paper presents a novel calculation of diffractive heavy meson production at the LHC using the $k_t$-factorization approach, incorporating higher-order corrections and analyzing correlation observables.

Contribution

It introduces the first differential cross section calculations for diffractive $c\bar c$ production in the $k_t$-factorization framework, including correlation observables and absorption effects.

Findings

Differential cross sections for diffractive $c\bar c$ production are computed in the $k_t$-factorization approach.

Correlation observables like azimuthal angle and pair transverse momentum are analyzed for the first time.

The approach effectively includes higher-order corrections and accounts for absorption effects.

Abstract

We discuss diffractive production of heavy mesons at the LHC. The differential cross sections for single- and central-diffractive mechanisms for $c\bar c$ pair production are calculated in the framework of the Ingelman-Schlein model corrected for absorption effects. Here, leading-order gluon-gluon fusion and quark-antiquark anihilation partonic subprocesses are taken into consideration. Both pomeron flux factors as well as parton distributions in the pomeron are taken from the H1 Collaboration analysis of diffractive structure function and diffractive dijets at HERA. The extra corrections from subleading reggeon exchanges are also taken into consideration. In addition to standard collinear approach, for the first time the differential cross sections for the diffractive $c\bar c$ pair production are calculated in the framework of the $k_t$-factorization approach, i.e. effectively including higher-order corrections. The unintegrated (transverse momentum dependent) diffractive parton distributions in proton are calculated with the help of the Kimber-Martin-Ryskin prescription where collinear diffractive PDFs are used as input. Some correlation observables, like azimuthal angle correlation between $c$ and $\bar c$, and $c \bar c$ pair transverse momentum were obtained for the first time. The hadronization of charm quarks is taken into account by means of fragmentation function technique.