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