Marisilvia Donadelli, University of Sao Paulo, Brazil
Candidate for Postdoctoral Appointment with P-25  

QUARKONIA PRODUCTION AT THE ATLAS EXPERIMENT IN THE LARGE HADRON COLLIDER

ATLAS (A Toroidal LHC ApparatuS) is a general purpose experiment operating at the Large Hadron Collider at CERN. Its research program is mainly focused on the investigation of processes beyond the Standard Model, but it also  includes a wide set of studies on the production of heavy quarkonium states. The large amount of data collected during the successful LHC Run 1 at unprecedent center-of-mass collision energies for p+p, Pb+Pb and p+Pb species, have provided valuable samples to benchmark detector performance based on the reconstruction of known particles with c and b quark content and serve as an important testing ground for QCD calculations.  

During my talk I will present an overview of quarkonia production measured in ATLAS via the di-muon decay channel.  The number of quarkonia candidates are extracted from observed di-muon pairs, applying event weights to unfold the response of the detector, reconstruction and trigger efficiency. The quarkonia yields are determined in regions of the di-muon transverse momentum, rapidity, and centrality, which is event activity that classifies the collision geometry in p+A and A+A collisions, often taken to be the transverse energy at large rapidities. The most recent ATLAS measurements on quarkonia production cross sections will be presented.