Production of Neutral Pions and Eta-mesons in pp Collisions Measured with ALICE

Understand

Invariant cross sections for neutral pions and eta mesons in pp collisions at sqrt(s) = 0.9, 2.76, and 7 TeV were measured by the ALICE detector at the Large Hadron Collider.

• Next-to-leading order (NLO) perturbative QCD calculations describe the pi0 and eta spectra at 0.9 TeV, but overestimate the measured cross sections at 2.76 TeV and 7 TeV.
• The measured eta/pi0 ratio is consistent with mT scaling at 2.76 TeV.
• At 7 TeV indications for a violation of mT scaling were found.