Abstract
In ultra-relativistic Heavy-Ion Collisions (HIC), the properties of the quark gluon plasma (QGP) can be explored, in particular, via measurements of neutral pions. The π 0 is an important probe for both proton and heavy ion physics. In the former case, π 0 production provides an important mean of testing pQCD as well as useful data to constrain current and future theoretical models. In the latter case, π 0 measurements will serve as a baseline for exploring the nature of the HIC hard scattering. In the ALICE experiment, π 0 mesons are identified as they decay into two photons (π 0→γ γ) using the high-resolution photon spectrometer (PHOS). PHOS will measure π 0 transverse momentum over a wide range, from hundreds of MeV/c to several tens of GeV/c. An estimation of π 0 production cross-section in proton–proton collisions is calculated in a next-to-leading order (NLO) approximation and first presented. The π 0 geometrical acceptance and the identification efficiency along with the analysis on the invariant mass are the two important correction factors for obtaining a realistic π 0 spectrum discussed in this paper.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License ( https://creativecommons.org/licenses/by-nc/2.0 ), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Benhabib, L. ALICE-PHOS: acceptance and efficiency correction factors p−p→π 0+X at 10 TeV. Eur. Phys. J. C 62, 197–201 (2009). https://doi.org/10.1140/epjc/s10052-009-1034-y
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DOI: https://doi.org/10.1140/epjc/s10052-009-1034-y