Neutral Pions Measured in the ALICE Electromagnetic Calorimeter in pp and p-Pb Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

20 May 2014, 16:30
spectrum (darmstadtium)



Board: E-12
Poster Jets Poster session


Jason Adrian Kamin (Johann-Wolfgang-Goethe Univ. (DE))


Light neutral mesons are among the most plentiful particles produced at the LHC and therefore serve as an ideal testing ground for pQCD in both pp and A-A collisions. Additionally, they provide a critical foundation upon which other analyses (direct photon, dilepton, etc) base their background determination. The nuclear modification factor $R_{\mathrm{AA}}$ shows a dramatic suppression in heavy ion collisions with respect to the pp baseline expectation presumably due to the formation of quark-gluon plasma (QGP). However, in order to disentangle how much of this phenomenon is simply a result of effects from "cold" nuclear matter in the initial state, p-A collisions are a necessary and useful control measurement. The ALICE electromagnetic calorimeter (EMCal) encompasses a large geometric acceptance of 100 degrees in azimuth and $|\eta|<0.7$ in pseudorapidity leading to a high statistics dataset. $\pi^{0}$ production is measured via the diphoton decay channel in pp collisions at $\sqrt{s} = 2.76~$TeV and in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02~$TeV. The status of the analysis of the differential invariant cross section for neutral pions as well as $R_{\rm pPb}$ will be presented for various centralities measured in the EMCal.
On behalf of collaboration: ALICE

Primary author

Jason Adrian Kamin (Johann-Wolfgang-Goethe Univ. (DE))

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