Abstract
We calculate angular correlation spectra between beauty ( B ) and anti-beauty 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 (NLO * approximation). To describe b-quark hadronization we use the universal scale-depended parton-to-meson fragmentation functions extracted from the combined e + e - annihilation data. The Kimber-Martin-Ryskin model for the unintegrated parton distribution functions in a proton is implied. We have obtained good agreement between our predictions and data from the CMS Collaboration at the energy S=7 TeV for B B angular correlations within uncertainties and without free parameters.
Highlights
Reggeization approach consistently merged with the next-to-leading order corrections from the emission of additional hard gluon (NLO approximation)
The Parton Reggeization Approach (PRA) is gauge-invariant scheme of high-energy Quantum Chromodynamics (QCD) calculations which extends the Collinear Parton Model (CPM) for description of hard multi-scale processes at the high-energy regime, when we d√eal with the processes in the multi-Regge kinematics (MRK)
The main ingredient of the PRA are the high-energy or kT −factorization of unintegrated parton distribution functions and gauge-invariant partonic cross sections with off-shell partons in the initial state, where these off-shell partons are considered as Reggeized gluons (R) and Reggeized quarks (Q)
Summary
From the emission of hard partons with large transverse momentum. The aim of our paper is to describe BBangular correlation spectra in the Parton Reggeization Approach (PRA) of QCD, as it has been done early for dijets [4], bb−jets [5, 6], prompt photon pairs [7], DDand DD pairs [8, 9]. The novelty of our present results is the merging of Leading-Order (LO) PRA contribution and real NLO*. Correction from the emission of additional hard gluon
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