Correlation observables in ${\rm Y}D$ pair production at the LHC within the parton Reggeization approach

Abstract

We study angular correlations in associated hadroproduction of ${\rm Y}(1S)$ with the $D^{\pm }$ and $D^0$-mesons at the LHC in the Leading Order of the parton Reggeization approach. Hadronization of $b\bar{b}$-pair to ${\rm Y}(1S)$ is described within the NRQCD-factorization framework. Production of $D-$mesons is described in the fragmentation model with scale-dependent fragmentaion functions. We have found good agreement with LHCb data for various differential distributions, except for the case of spectra on azimuthal angle differences at the small $△\phi$ values. The total cross-section in our Single Parton Scattering model, calculated under conservative assumptions, accounts for almost one half of observed cross-section, thus dramatically shrinking the room for Double Parton Scattering mechanism.

Comments: 6 pages, 2 figures, talk at the HSQCD-2018