XXV International Baldin Seminar on High Energy Physics Problems "Relativistic Nuclear Physics and Quantum Chromodynamics"

Gluon distribution in nucleon and its applicaton to analysis of pp and AA collisions at high energes and mid-rapidity

21 Sept 2023, 15:50

20m

Conference Hall (BLTP JINR)

Parallel: Structure functions of hadrons and nuclei

Speaker

Lykasov, Gennady (JINR)

Description

The review of the transverse momentum dependent (TMD) gluon density and its application to analysis of $pp$ and $AA$ collisions in the wide region of initial energies at mid-rapidity is presented. It is shown that the non-colliniar QCD evolution is sensitive to the TMD gluon distributions at initial scale ${\mu }_0$. The new TMD gluon density in a proton at ${\mu }_0$ is suggested using its saturation at low scales observed in DIS at HERA. Corresponding phenomenological parameters important at low $x$ are found from the best description of charged hadron $p_T$-spectra in $pp$ collisions at low hadron transverse momenta $p_T$ in the mid-rapidity at the LHC energies. Other parameters important at moderate and large $x$ are found from the satisfactory description of many data on hard $pp$ processes at LHC energies. The Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation is applied to extend the initial gluon distribution into the whole kinematical region.

The TMD gluon suggested in [1-4] is used to analyze the pion and kaon inclusive production in $pp$ and $BeBe$ collisions [5,6]. The satisfactory description of NA61/SHINE data on inclusive spectra versus their transverse momenta $p_T$ less than 1 GeV are presented in [5,6]. The data on ratio of cross sections $R_{K/\pi }={\sigma }_{K^{\pm }}/{\sigma }_{{\pi }^{\pm }}$ at the zero rapidity $y$ are also described satisfactorily and predictions for high energies are presented.

Using the suggested TMD gluon distribution we obtain the self-consistent description of soft hadron production in $pp$ collisions at moderate and high energies at mid-rapidity. Extension of proposed initial gluon distribution into the whole kinematical region using the CCFM evolution equation allows us to describe satisfactorily many data on hard $pp$ processes at LHC energies.

REFERENCES
[1] V.A. Bednyakov, A.A. Grinyuk, G.I. Lykasov, M. Poghosyan, Int.J.Mod.Phys., A $\mathbf{27}$, 125042 (2012).
[2] A.A. Grinyuk, A.V. Lipatov, G.I. Lykasov, N.P. Zotov, Phys.Rev. D $\mathbf{87}$, 074017 (2013).
[3] A.V. Lipatov, G.I. Lykasov, M.A. Malyshev, Phys.Rev. D $\mathbf{107}$, 014022 (2023).
[4] A.V. Lipatov, G.I. Lykasov, M.A. Malyshev, Phys.Lett.B $\mathbf{839}$, 137780 (2023).
[5] G.I. Lykasov, A.I. Malakhov, A.A. Zaitsev, Eur. Phys. J. A $\mathbf{57}$, 91 (2021).
[6] G.I. Lykasov, A.I. Malakhov, A.A. Zaitsev, Eur. Phys. J. A $\mathbf{58}$, 112 (2022)

Presentation materials

Lykasov_XXVBaldin _sem_2023_corr.pdf

Peer reviewing

Paper

Accepted on 12 Feb 2024 by Baldin ISHEPP Seminar

LLMMZ_proc_XXVIS_corr_13.01.24.pdf

• LLMMZ_proc_XXVIS_corr_13.01.24.tex