arXiv subjects

Alexey Chernyshev

Publications and source records attributed to Alexey Chernyshev.

6 recordsLinked to original sources

arXiv2024

Single isolated photon production in the NLO${}^\star$ approximation of the Parton Reggeization Approach

The hadroproduction of single isolated photon at high energies is studied within the framework of the NLO${}^\star$ approximation of the Parton Reggeization Approach based on the modified Multi-Regge limit of the hard scattering QCD amplitudes. The contribution from the LO subprocess $Q \bar Q \to γ$ and the NLO tree-level corrections $Q R \to γq$ and $Q \bar Q \to γg$ are considered. To avoid specific double counting in rapidity between tree-level corrections to the hard scattering coefficient and unintegrated PDFs, a corresponding subtraction scheme is proposed. We demonstrated self-consistency of the Parton Reggeization Approach using the subtraction scheme. The results of calculations are compared with data from various Collaborations in the wide energy range $\sqrt{S} = 24 \ {\rm GeV} - 13 \ {\rm TeV}$. We obtained a quite satisfactory agreement with data up to $p_T^γ/ \sqrt{S} \simeq 0.2 - 0.3$. Predictions for the future SPD NICA experiment were discussed.

hep-ph↗

arXiv2024

Charmonium pair production at the LHCb in the ICEM using the $k_T$-factorization: DPS versus SPS

In the article, we study pair production of $ψ[1S]$ and $ψ[2S]$ charmonium states in the forward rapidity region of the LHCb experiment at the $\sqrt{s} = 13$ TeV using the improved color evaporation model and the parton Reggeization approach, which is a gauge invariant version of the $k_T$-factorization approach. Taking into account single and double parton scattering mechanisms and using the set of model parameters which have been fixed early, we compare our theoretical predictions with the recent LHCb experimental data as well as with another theoretical predictions. The numerical calculations are performed using the parton--level Monte-Carlo event generator KaTie and modified KMRW model for unintegrated parton distribution functions. We have found absolutely dominant role of the double parton scattering mechanism in the charmonium pair production at the LHCb.

hep-ph↗

arXiv2024

Production of single isolated photons in the Parton Reggeization Approach

In the article, we study the processes of single isolated photon production at the LHC energies in the framework of the Parton Reggeization Approach taking into account LO and NLO* contributions, the last one includes only tree-level corrections. Reggeized amplitudes are constructed according to the effective field theory formalism for multi-Regge kinematics processes suggested by L.N. Lipatov. To avoid the double counting between tree-level corrections and unintegrated parton distribution functions, a subtraction scheme is introduced. The results of calculations are compared with experimental data.

hep-ph↗

arXiv2023

Associated production of heavy quarkonium and $D-$meson in the improved color evaporation model with KaTie

In the article, we study associated production of prompt $J/ψ(Υ)$ and $D-$mesons in the improved color evaporation model using the high-energy factorization approach as it is realized in the Monte-Carlo event generator KaTie. The modified Kimber-Martin-Ryskin-Watt model for unintegrated parton distribution functions is used. We predict cross sections for associated $J/ψ(Υ)$ and $D-$meson hadroproduction via the single and double parton scattering mechanisms using the set of model parameters which has been fixed early for description of prompt single and pair heavy quarkonium production at the LHC energies. We found the results of calculations agree with the LHCb Collaboration data at the energies $\sqrt{s} = 7,8$ TeV and we present theoretical predictions for the energy $\sqrt{s} = 13$ TeV .

hep-ph↗

arXiv2023

Associated production of $J/ψ$ plus $Z(W)$ in the improved color evaporation model using the parton Reggeization approach

In the article, we study the associated production of prompt $J/ψ$ mesons and $Z(W)$ bosons in the improved color evaporation model using the high-energy factorization as it is formulated in the parton Reggeization approach. The last one is based on the modified Kimber-Martin-Ryskin-Watt model for unintegrated parton distribution functions and the effective field theory of Reggezied gluons and quarks, suggested by L.N.~Lipatov. We predict cross section for associated $J/ψ$ and $Z ( W)$ hadroproduction via the single and double parton scattering mechanisms using the set of model parameters that have been obtained early for the description of single and double prompt $J/ψ$ production at the LHC energies. The numerical calculations are realized using the Monte-Carlo event generator KaTie. The calculation results are compared with the data at the energies $\sqrt{s} = 7 \mbox{ and } 8$ TeV and we make predictions for the energy $\sqrt{s} = 13$ TeV for $J/ψ$ plus $Z(W)$ and $Υ$ plus $Z/W$ at the $\sqrt{s} = 8 \mbox{ and } 13$ TeV associated productions.

hep-ph↗

arXiv2023

Pair production of heavy quarkonia in the color evaporation model

In the article, we study pair production of heavy quarkonia $(J/ψJ/ψ, ΥΥ, ΥJ/ψ)$ in the improved color evaporation model via the parton Reggeization approach. The last one is based on high-energy factorization of hard processes in multi-Regge kinematics, the Kimber-Martin-Ryskin-Watt model for unintegrated parton distribution functions, and the Lipatov effective field theory of Reggezied gluons and quarks. We compare contributions from the single and double parton scattering mechanisms in the pair production of heavy quarkonia. The numerical calculations are performed with the Monte-Carlo event generator KaTie.

hep-ph↗