Heavy Flavour Production at Tevatron and Parton Shower Effects

TL;DR

This paper presents predictions for heavy flavor production at the Tevatron using the $k_T$-factorization approach, emphasizing the importance of parton shower effects in matching experimental angular correlation data.

Contribution

It introduces a detailed analysis of charm and beauty production at Tevatron within the $k_T$-factorization framework, highlighting the role of parton showers in describing angular correlations.

Findings

Parton showers significantly affect angular correlations.

Including the $gg^* ightarrow gg$ process improves decorrelation predictions.

Predictions agree with D0 and CDF experimental data.

Abstract

We present hadron-level predictions from the Monte Carlo generator Cascade and numerical calculations of charm and beauty production at the Fermilab Tevatron within the framework of the $k_T$-factorization QCD approach. Our consideration is based on the CCFM-evolved unintegrated gluon densities in a proton. The performed analysis covers the total and differential cross sections of open charm and beauty quarks, $B$ and $D$ mesons (or rather muons from their semileptonic decays) and the total and differential cross sections of $b \bar b$ di-jet hadroproduction. We study the theoretical uncertainties of our calculations and investigate the effects coming from parton showers in initial and final states. Our predictions are compared with the recent experimental data taken by the D0 and CDF collaborations. Special attention is put on the specific angular correlations between the final-state particles. We demonstrate that the final state parton shower plays a crucial role in the description of such observables. The decorrelated part of angular separations can be fully described, if the process $gg^*\rightarrow gg$ is included.