Neutral Meson and Direct Photon Measurements with the ALICE Experiment


  • O. Kovalenko National Centre for Nuclear Research



high-energy physics, neutral meson spectra, direct photons


The ALICE experiment is designed to study the properties of the matter created in proton-proton and heavy-ion collisions at the LHC. Neutral mesons can be reconstructed in ALICE in a wide range of transverse momenta via two-photon decays. Neutral meson measurements in pp collisions give an opportunity to validate the NLO or NNLO pQCD calculations and to constrain the parton distribution functions and the parton fragmentation functions. Neutral meson spectra measured in pA and AA collisions allow us to test a modification of the parton distribution functions in nuclei and the parton energy loss in the hot matter created in AA collisions. The recent results from ALICE on direct photon measurements in the Pb–Pb, neutral pion and n meson productions in pp, p-Pb, and Pb–Pb collisions are presented.


ALICE Collaboration. The ALICE experiment at the CERN LHC. J. Instrum. 3, S08002 (2008).

ALICE Collaboration. ALICE electromagnetic calorimeter: addendum to the ALICE technical proposal. CERN-LHCC-2006-014, CERN-LHCC-96-32-ADD-3 (2006).

ALICE Collaboration. Technical Design Report of the Photon Spectrometer (PHOS). CERN-LHCC-99-04 (1999).

J. Alme et al. The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events. Nucl. Instrum. Meth. A 622, 316 (2010).

ALICE Collaboration. Neutral pion and n meson production in proton-proton collisions at vs = 0.9 TeV and vs = 7 TeV. Phys. Lett. B 717, 162 (2012).

ALICE Collaboration. Neutral pion production at midrapidity in pp and PbPb collisions at vSNN = 2.76 TeV. Eur. Phys. J. C 74, 3108 (2014).

ALICE Collaboration. Production of п0 and n mesons up to high transverse momentum in pp collisions at 2.76 TeV. Eur. Phys. J. C 77, 339 (2017).

ALICE Collaboration. Neutral pion and n meson production at mid-rapidity in Pb-Pb collisions at vSNN = 2.76 TeV. Phys. Rev. C 98, 044901 (2018).

ALICE Collaboration. п0 and n meson production in proton-proton collisions at vs = 8 TeV. Eur. Phys. J. C 78, 263 (2018).

P. Skands, S. Carrazza, J. Rojo. Tuning PYTHIA 8.1: the Monash 2013 tune. Eur. Phys. J. C74, 3024 (2014).

D. de Florian, R. Sassot, M. Epele, R.J. Hern?andez-Pinto, M. Stratmann. Parton-to-pion fragmentation reloaded. Phys. Rev. D 91, 014035 (2015).

W. Tung, H. Lai, A. Belyaev, J. Pumplin, D. Stump, C.-P. Yuan. Heavy quark mass effects in deep inelastic scattering and global QCD analysis. JHEP 02, 053 (2007).

C.A. Aidala, F. Ellinghaus, R. Sassot, J.P. Seele, M. Stratmann. Global analysis of fragmentation functions for eta mesons. Phys. Rev. D 83, 034002 (2011).

A. Bylinkin, N.S. Chernyavskaya, A.A. Rostovtsev. Predictions on the transverse momentum spectra for charged particle production at LHC-energies from a two component model. Eur. Phys. J. C 75, 166 (2015).

ALICE Collaboration. Neutral pion and n meson production in p-Pb collisions at vSNN = 5.02 TeV. Eur. Phys. J. C 78, 624 (2018).

C. Tsallis. Possible generalization of Boltzmann-Gibbs statistics. J. Statist. Phys. 52 479 (1988).

B. J?ager, A. Sch?afer, M. Stratmann, W. Vogelsang. Next-to-leading order QCD corrections to high-pT pion production in longitudinally polarized pp collisions. Phys. Rev. D 67, 054005 (2003).

K. Werner, B. Guiot, Iu. Karpenko, T. Pierog. Analyzing radial flow features in p-Pb and pp collisions at several TeV by studying identified-particle production with the event generator EPOS3. Phys. Rev. C 89, 064903 (2014).

S. Roesler, R. Engel, J. Ranft. The Monte Carlo Event Generator DPMJET-III. arXiv:0012252 [hep-ph](2010).

Chun Shen, Jean-Fran?cois Paquet, Gabriel S. Denicol, Sangyong Jeon, Charles Gale. Collectivity and electromagnetic radiation in small systems. Phys. Rev. C 95, 014906 (2017).

M. Gyulassy, X.N. Wang. HIJING 1.0: A Monte Carlo program for parton and particle production in high energy hadronic and nuclear collisions. Comput. Phys. Commun. 83, 307 (1994).

T. Lappi, H. M?antysaari. Single inclusive particle production at high energy from HERA data to proton-nucleus collisions. Phys. Rev. D 88, 114020 (2013).

V. Begun, W. Florkowski, M. Rybczynski. Explanation of hadron transverse-momentum spectra in heavy-ion collisions at vSNN = 2.76 TeV within a chemical nonequilibrium statistical hadronization model. Phys. Rev. C 90, 014906 (2014).

ALICE Collaboration. Direct photon production in Pb-Pb collisions at vSNN = 2.76 TeV. Phys. Lett. B 235-248s, 754 (2019).

S. Catani, M. Fontannaz, J.P. Guillet, E. Pilon. Cross section of isolated prompt photons in hadron-hadron collisions. JHEP 0205, 028 (2002).

P. Aurenche, M. Fontannaz, J.P. Guillet, E. Pilon, M.Werlen. Recent critical study of photon production in hadronic collisions. Phys. Rev. D 73, 094007 (2006).




How to Cite

Kovalenko, O. (2019). Neutral Meson and Direct Photon Measurements with the ALICE Experiment. Ukrainian Journal of Physics, 64(7), 602.



Special Issue