Speakers
Prof.
Gennady Lykasov
(JINR. Dubna, Russia)Dr
Nikolay Zotov
(Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991, Moscow, Russia)
Description
We study the connection between the inclusive spectra of hadrons produced in
$pp$ collision at LHC energies at low transverse momenta and the unintegrated
gluon distribution (u.g.d.) at small $x$ at the starting scale $Q_0^2$.
This gluon distribution [1] is obtained from the best description
of the LHC data in the soft kinematical region and it does not contradict to the
asymptotic behaviour of the solution of the BFKL equation at large transverse
momenta of gluons. To extend the u.g.d. to higher $Q^2$ we use the
Catani-Ciafoloni-Fiorani-Marchesini (CCFM) evolution equation.
It is shown that the evoluted u.g.d. is very sensitive to the starting u.g.d. especially
at low transverse momenta $\mid k_T\mid<$ 1 GeV$/$c.
The inclusion of the CCFM evolution results in a large increase of the u.g.d. magnitude
at low $x$ and large $\mid k_T\mid$ above a few GeV$/$c. The application of the obtained
u.g.d to the analysis of the $ep$ deep inelastic scattering allows us
to get the results, which describe reasonably well the H1 and ZEUS data
on the longitudinal proton structure function $F_L(x,Q^2)$ [2]. So, the connection
between the soft processes at LHC and small $x$ physics at HERA has been confirmed
and extended to a wide kinematical region. The self-consistent satisfactory description of
both the LHC and HERA data allows us to correct the value of saturation scale for
the gluon density.
References
[1]
A.A.Grinyuk, A.V.Lipatov, G.I.Lykasov, N.P.Zotov,
Phys.Rev. D87 (2013) 074017.
[2]
A.V.Lipatov, G.I.Lykasov, N.P.Zotov,
Phys.Rev. D89 (2014) 014001.
Primary author
Prof.
Gennady Lykasov
(JINR. Dubna, Russia)
Co-authors
Mr
Andrey Grinyuk
(JINR. Dubna, Russia)
Dr
Artem Lipatov
(Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991, Moscow, Russia)
Dr
Nikolay Zotov
(Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991, Moscow, Russia)