Mariola Klusek-Gawenda

Exclusive muon-pair production in ultrarelativistic heavy-ion collisions: Realistic nucleus charge form factor and differential distributions

The cross sections for exclusive muon-pair production in nucleus-nucleus collisions are calculated and several differential distributions are shown. Realistic (Fourier transform of charge density) charge form factors of nuclei are used and the corresponding results are compared with the cross sections calculated with monopole form factor often used in the literature and discussed recently in the context of higher-order QED corrections. Absorption effects are discussed and quantified. The cross sections obtained with realistic form factors are significantly smaller than those obtained with the monopole form factor. The effect is bigger for large muon rapidities and/or large muon transverse momenta. The predictions for the STAR and PHENIX collaboration measurements at RHIC as well as the ALICE and CMS collaborations at LHC are presented.

Light-by-light scattering in ultraperipheral Pb-Pb collisions at energies available at the CERN Large Hadron Collider

We calculate cross sections for diphoton production in (semi)exclusive

Photoproduction of

PbPb

J/\psi

collisions, relevant for the LHC. The calculation is based on equivalent photon approximation in the impact parameter space. The cross sections for elementary

mesons in peripheral and semicentral heavy ion collisions

\gamma \gamma \to \gamma \gamma

The γγ → J/ψJ/ψ reaction and the J/ψJ/ψ pair production in exclusive ultraperipheral ultrarelativistic heavy ion collisions

subprocess are calculated including two different mechanisms. We take into account box diagrams with leptons and quarks in the loops. In addition, we consider a vector-meson dominance (VDM-Regge) contribution with virtual intermediate hadronic (vector-like) excitations of the photons. We get much higher cross sections in

Two-gluon exchange contribution to elastic γγ → γγ scattering and production of two-photons in ultraperipheral ultrarelativistic heavy ion and proton–proton collisions

PbPb

Double-scattering mechanism in the exclusiveAA→AAρ0ρ0reaction in ultrarelativistic collisions

collisions than in earlier calculation from the literature. This opens a possibility to study the

Exclusive production of large invariant mass pion pairs in ultraperipheral ultrarelativistic heavy ion collisions

\gamma \gamma \to \gamma \gamma

APS : From the

(quasi)elastic scattering at the LHC. We present many interesting differential distributions which could be measured by the ALICE, CMS or ATLAS Collaborations at the LHC. We study whether a separation or identification of different components (boxes, VDM-Regge) is possible. We find that the cross section for elastic