May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

Study of Ultraperipheral processes in sqrt(s_NN)=2.76 Pb+Pb collisions with the ATLAS detector at the LHC

Not scheduled
Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Parallel Heavy flavor and quarkonia production


Dr Toni Baroncelli (Physics Department University of ROMA TRE - Rome -Italy)


Besides the study of strongly-coupled matter, heavy ion collisions at the LHC provide opportunities to study photon-nucleus and two-photon reactions in a hitherto unexplored energy regimse. Photoproduction of vector mesons off of the strong electromagnetic fields generated by the highly Lorentz-contracted nuclei provides a tool to study the interactions of quark-antiquark dipoles with strong gluon fields. This talk presents a first study of these large impact parameter “ultraperipheral” collisions (UPC), with a data set corresponding to up to 9 µb-1 of lead-lead collisions at a nucleon-nucleon center-of-mass energy of 2.76 GeV, recorded by the ATLAS Detector at the LHC. Two-prong events are selected with essentially no other activity registered in the rest of the detector, except for forward neutrons measured by the ATLAS zero degree calorimeters. Results on di-muon decays into J/psi and other channels will be presented.

Primary author

Dr Toni Baroncelli (Physics Department University of ROMA TRE - Rome -Italy)

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