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\textbf{LXXIV International conference Nucleus-2024: Fundamental problems and applications}
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\noindent Abstract ID:
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\textbf{PROMPT PHOTON PRODUCTION IN SUB-PROCESSES $qg\to q\gamma $ AND
$q\gamma \to q\gamma $ OF COMPTON SCATTERING IN COLLISION OF
LONGITUDINALLY POLARIZED PROTONS AT NICA ENERGIES}
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\noindent \textbf{Content}
\noindent \textbf{Author:} M.R.Alizada (Baku State University, Baku, Azerbaijan)
\noindent \textbf{Abstract:} Photons are of particular importance in the study of hadronic and
nuclear interactions at high energies. The process of prompt photon production plays
an important role in determining the distribution of gluons in the proton and testing
some aspects of perturbative quantum chromodynamics.
The dependence of the differential cross-section of the production of prompt photons
with sub-processes of mixed chromo-electrodynamic $qg\to q\gamma $ and pure
electrodynamic $q\gamma \to q\gamma $ Compton scattering in collision of
longitudinal polarized protons on the sum of the energies of colliding protons
$\sqrt{s} $, the transverse momentum $p_T$ of photons, the cosine of
the scattering angle $Cos(\theta)$ and the rapidity of photons \textit{y} and
$x_T$ was investigated.
Investigation of differential cross-section on on the sum of the energies of colliding protons
$\sqrt{s} $, the transverse momentum $p_T$ of photons showed that influence
of polarization of the initial particles can increase or decrease the differential cross- section
depending on the helicity. With different signs of the helicity of the initial particles,
the total cross-section decreases, and with the same signs of the helicity, the total
cross-section increases compared to the non-polarized case. The polarization
of the initial particles strongly influence the subprocess $qg\to q\gamma $
which contribution dominate the contribution of the subprocess
$q\gamma \to q\gamma $.
The dependence of the differential cross-section on the cosine of the prompt
photon scattering angle for subprocesses $qg\to q\gamma $ and
$q\gamma \to q\gamma $ shows that polarization has not changed
the character of the dependence. The maximum value of the differential cross-section
is achieved at departure angles close to 16 and 164 degrees. This indicates
that the probability that the photon will be scattered along the collision axis is highest.
As the scattering angle increases, the differential cross-section decreases.
The value of the differential cross-section has a maximum value at $y=\pm 1.95$ and
decreases with changes in the value of y. The differential cross-section has
a minimum value at $y=0$.
The investigation of double-spin asymmetry of the processes showed that the helicity
of the initial particles affects the double-spin asymmetry of the sub-process
$qg\to q\gamma $ and $q\gamma \to q\gamma $ in different ways.
Thus, we can conclude that it is necessary to take into account the influence of the
subprocess $q\gamma \to q\gamma $ when modeling and analyzing experimental
data of proton-proton collisions at NICA energies. \
\textbf{Section}
Nuclear structure: theory and experiment
\textbf{Primary author: }Mohsun R. Alizada (Department of Theoretical Physics, Baku State University,\
\quad \quad \quad \quad \quad \quad Baku, Azerbaijan)
\textbf{Presenter: }Mohsun R. Alizada
\textbf{Contribution type: } Plenary
Submitted by Alizada Mohsun, 16 April 2024
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| Section | Nuclear structure: theory and experiment |
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