Beams of relativistic heavy ions are accompanied by a large flux of equivalent photons, and photon-induced reactions are the dominant interaction mechanism in heavy-ion collisions when the colliding nuclei have transverse separation larger that the nuclear diameter. In these ultra-peripheral collisions (UPC) the photon can provide a clean probe of the partonic structure of the nucleus...
Using the framework that interpolates between the leading power limit of the Color Glass Condensate and the High Energy (or kT) factorization we calculate the direct component of the forward dijet production in ultra-peripheral Pb-Pb collisions at CM energy 5.1TeV per nucleon pair. The formalism is applicable when the average transverse momentum of the dijet system PT is much bigger than the...
We use high energy factorisation (HEF) framework, implemented in Monte Carlo generator KaTie, to study forward-central dijets in heavy ion collisions. We argue, that the dijets in HEF allow to study the rapidity dependence of the structure of the fireball formed in the collision.
We shall present theoretical predictions for production of
$J/\Psi$ meson, $\gamma\gamma$, one and two pairs of leptons
and $p \bar{p}$ in ultrarelativistic UPC.
Analyses are done in the impact parameter space equivalent photon approximation.
We use so-called realistic form factor which is a Fourier transform
of the charge distribution in nuclei.
We consider both ultraperipheral and for the...
In Ultra-Peripheral Collisions (UPC), two nuclei pass close to each other
at an impact parameter greater than the sum of their radii; in such
collisions hadronic processes are strongly suppressed, while γ interactions
are enhanced with respect to minimum-bias collisions.
Photoproduction of vector mesons in UPC is a powerful tool to probe the
nuclear gluon distribution in the nucleus, for which...
The large equivalent-photon fluxes accompanying Pb ion beams at the LHC initiate photon- photon and photo-nuclear interactions which dominate when the colliding nuclei have large impact parameter (ultra-peripheral collisions). These electromagnetically-induced processes are sensitive to the nuclear wave-function and in particular the nuclear modifications of the nucleon parton distribution...
The exclusive vector meson production cross section is one of the most promising observables to probe the high energy regime of the QCD dynamics. In particular, the squared momentum transfer (t) distributions are an important source of information about the spatial distribution of the gluons in the hadron and about fluctuations of the color fields. In this contribution we present our recent...