Neutral Meson and Direct Photon Measurements with the ALICE Experiment
DOI:
https://doi.org/10.15407/ujpe64.7.602Keywords:
high-energy physics, neutral meson spectra, direct photonsAbstract
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.
References
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). https://doi.org/10.1140/epjc/s10052-014-3024-y
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). https://doi.org/10.1103/PhysRevD.91.014035
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). https://doi.org/10.1088/1126-6708/2007/02/053
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). https://doi.org/10.1103/PhysRevD.83.034002
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). https://doi.org/10.1140/epjc/s10052-015-3392-y
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). https://doi.org/10.1007/BF01016429
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). https://doi.org/10.1103/PhysRevD.67.054005
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). https://doi.org/10.1103/PhysRevC.89.064903
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). https://doi.org/10.1103/PhysRevC.95.014906
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). https://doi.org/10.1016/0010-4655(94)90057-4
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). https://doi.org/10.1103/PhysRevD.88.114020
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). https://doi.org/10.1103/PhysRevC.90.014906
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). https://doi.org/10.1088/1126-6708/2002/05/028
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). https://doi.org/10.1103/PhysRevD.73.094007
Downloads
Published
How to Cite
Issue
Section
License
Copyright Agreement
License to Publish the Paper
Kyiv, Ukraine
The corresponding author and the co-authors (hereon referred to as the Author(s)) of the paper being submitted to the Ukrainian Journal of Physics (hereon referred to as the Paper) from one side and the Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, represented by its Director (hereon referred to as the Publisher) from the other side have come to the following Agreement:
1. Subject of the Agreement.
The Author(s) grant(s) the Publisher the free non-exclusive right to use the Paper (of scientific, technical, or any other content) according to the terms and conditions defined by this Agreement.
2. The ways of using the Paper.
2.1. The Author(s) grant(s) the Publisher the right to use the Paper as follows.
2.1.1. To publish the Paper in the Ukrainian Journal of Physics (hereon referred to as the Journal) in original language and translated into English (the copy of the Paper approved by the Author(s) and the Publisher and accepted for publication is a constitutive part of this License Agreement).
2.1.2. To edit, adapt, and correct the Paper by approval of the Author(s).
2.1.3. To translate the Paper in the case when the Paper is written in a language different from that adopted in the Journal.
2.2. If the Author(s) has(ve) an intent to use the Paper in any other way, e.g., to publish the translated version of the Paper (except for the case defined by Section 2.1.3 of this Agreement), to post the full Paper or any its part on the web, to publish the Paper in any other editions, to include the Paper or any its part in other collections, anthologies, encyclopaedias, etc., the Author(s) should get a written permission from the Publisher.
3. License territory.
The Author(s) grant(s) the Publisher the right to use the Paper as regulated by sections 2.1.1–2.1.3 of this Agreement on the territory of Ukraine and to distribute the Paper as indispensable part of the Journal on the territory of Ukraine and other countries by means of subscription, sales, and free transfer to a third party.
4. Duration.
4.1. This Agreement is valid starting from the date of signature and acts for the entire period of the existence of the Journal.
5. Loyalty.
5.1. The Author(s) warrant(s) the Publisher that:
– he/she is the true author (co-author) of the Paper;
– copyright on the Paper was not transferred to any other party;
– the Paper has never been published before and will not be published in any other media before it is published by the Publisher (see also section 2.2);
– the Author(s) do(es) not violate any intellectual property right of other parties. If the Paper includes some materials of other parties, except for citations whose length is regulated by the scientific, informational, or critical character of the Paper, the use of such materials is in compliance with the regulations of the international law and the law of Ukraine.
6. Requisites and signatures of the Parties.
Publisher: Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine.
Address: Ukraine, Kyiv, Metrolohichna Str. 14-b.
Author: Electronic signature on behalf and with endorsement of all co-authors.
.png){kind=small}
