17-24 July 2013
KTH and Stockholm University Campus
Europe/Stockholm timezone

Vector meson photoproduction at the LHC studied by the ALICE experiment

19 Jul 2013, 09:36
D3 (KTH Campus)


KTH Campus

Talk presentation Ultrarelativistic Heavy Ions Ultrarelativistic Heavy Ions


Joakim Nystrand (University of Bergen (NO))


The strong electromagnetic fields surrounding the Pb-ions accelerated at the CERN Large Hadron Collider (LHC) allow two-photon and photonuclear interactions to be studied in a new kinematic regime. These interactions can be studied in ultra-peripheral collisions, where the impact parameters are larger than the sum of the nuclear radii and hadronic interactions are suppressed. During the heavy-ion runs at the LHC in 2010 and 2011, and during the proton- lead run in 2013, the ALICE experiment implemented dedicated triggers to select ultra-peripheral collisions. These triggers were based on the Muon spectrometer, the Time-of-Flight detector, the Silicon Pixel detector, and the VZERO scintillator array. Information from other detectors was also used in the analysis. The cross section for photoproduction of J/Psi meson at mid and forward rapidities in Pb-Pb collisions will be presented. The results will be compared to model calculations and their implications for nuclear gluon shadowing will be discussed. First results on J/Psi photoproduction in p-Pb collisions will also be discussed.

Primary author

Joakim Nystrand (University of Bergen (NO))

Presentation Materials