$B{\bar B}$ angular correlations at the LHC in parton Reggeization approach merged with higher-order matrix elements

TL;DR

This paper presents a calculation of $B\bar{B}$ angular correlations in proton-proton collisions at the LHC using a merged parton Reggeization approach with higher-order corrections, achieving good agreement with CMS data at 7 TeV and providing predictions for 13 TeV.

Contribution

It introduces a novel combined approach merging parton Reggeization with NLO corrections for $B\bar{B}$ correlations, validated against experimental data.

Findings

Good agreement with CMS data at 7 TeV for $B\bar{B}$ angular correlations.

Provides predictions for $B\bar{B}$ correlations at 13 TeV.

Demonstrates the effectiveness of the merged approach in high-energy QCD calculations.

Abstract

We calculate the angular distribution spectra between beauty ($B$) and anti-beauty ($\bar B$) mesons in proton-proton collisions in the leading order approximation of the parton Reggeization approach consistently merged with the next-to-leading order corrections from the emission of additional hard gluon. To describe b-quark hadronization we use the universal scale-depended parton-to-meson fragmentation functions extracted from the world $e^+e^-$ annihilation data. We have obtained good agreement between our predictions and data from the CMS Collaboration at the energy $\sqrt{S}=7$ TeV for $B \bar B$ angular correlations within uncertainties and without free parameters. Predictions for analogous correlation observables at $\sqrt{S}=13$ TeV are provided.