Speaker
Antoni Szczurek
(Institute of Nuclear Physics, Krakow and Rzeszow University, Rzeszow)
Description
We shall discuss two reactions:
$A A \to A A \gamma \gamma$ and $A A \to A A e^+ e^- e^+ e^-$.
In the first case we shall discuss connections with elastic
$\gamma \gamma$ scattering. Several mechanisms are included:
lepton and quark boxes, vector-dominance mechanism and two-gluon exchange mechanism.
The calculations are done in the equivalent photon approximation
in the impact parameter space (EPA-b). Several differential distributions
are calculated.
Feasibility studies will be presented. Measurable counting
rates are obtained. A special attention is devoted to
searches for hints of the VDM-Regge mechanism as well as two-gluon exchange one.
The studies show that first identification/measurement of elastic $\gamma \gamma$
scattering is accessible with present experimental infrastructure.
The expected number of events will be given.
In the second case of four-lepton production we consider only double scattering
$\gamma \gamma \to e^+ e^-$ mechanism. As in the first case
the calculation are done in the EPA-b. We present several differential
distributions imposing experimental cuts on rapidities and transverse momenta
relevant for different experiments at the LHC. Corresponding number of counts
will be given. Our study show that corresponding measurements
should be possible soon and would allow a first identification
of the double scattering mechanism.
Primary author
Antoni Szczurek
(Institute of Nuclear Physics, Krakow and Rzeszow University, Rzeszow)
