Quarkonium Production Measurements with the ALICE Detector at the LHC
Keywords:QGP, quarkonium, relativistic heavy-ion collisions, cold nuclear matter effects
In (ultra-)relativistic heavy-ion collisions, the strongly interacting
matter is predicted to undergo a phase transition into a plasma of deconfined
quarks and gluons (QGP) and quarkonia probe different aspects of this medium.
However, the medium modification of quarkonium production includes also the contribution of cold nuclear matter effects (CNM), such as shadowing or nuclear break-up in addition to QGP effects. Proton--nucleus collisions, where no QGP is expected, are used to measure cold nuclear matter effects on quarkonium production. Vacuum production of quarkonia is modelled in proton--proton (pp) collisions, which are used as reference for both heavy-ion and proton--nucleus collisions. Besides serving as reference, results in pp collisions represent a benchmark test of QCD based models in both perturbative and non-perturbative regimes. The ALICE detector has unique capabilities at the LHC for measuring quarkonia down to zero transverse momentum. Measurements are carried out at both central and forward rapidity, in the dielectron and dimuon decay channel, respectively. In this contribution
the latest quarkonium measurements for various energies and colliding systems, performed by the ALICE Collaboration during the LHC Run-2 period, will be discussed.
N. Cabibbo, G. Parisi. Exponential hadronic spectrum and quark liberation. Phys. Lett. B 59, 67 (1975). https://doi.org/10.1016/0370-2693(75)90158-6
T. Matsui, H. Satz. J/ф suppression by quark-gluon plasma formation. Phys. Lett. B 178, 416 (1986). https://doi.org/10.1016/0370-2693(86)91404-8
P. Braun-Munzinger, J. Stachel. (Non)thermal aspects of charmonium production and a new look at J/ф suppression. Phys. Lett. B 490, 196 (2000). https://doi.org/10.1016/S0370-2693(00)00991-6
R.L. Thews, M. Schroedter, J. Rafelski. Enhanced J/ф production in deconfined quark matter. Phys. Rev. C 63, 054905 (2001). https://doi.org/10.1103/PhysRevC.63.054905
B. Abelev et al., ALICE Coll. J/ф Suppression at Forward Rapidity in Pb-Pb Collisions at vSNN = 2.76 TeV. Phys. Rev. Lett. 109, 072301 (2012).
B. Abelev et al., ALICE Coll. Jф production and nuclear effects in p-Pb collisions at vSNN = 5.02 TeV. JHEP 02, 73 (2014).
J. Adam et al., ALICE Coll. Centrality dependence of inclusive Jф production in p-Pb collisions at vSNN = 5.02 TeV. JHEP 11, 127 (2015).
B. Abelev et al., ALICE Coll. Production of inclusive ?(1S) and ?(2S) in p-Pb collisions at vSNN = 5.02 TeV. Phys. Lett. B 740, 105 (2015).
K. Aamodt et al., ALICE Coll. The ALICE experiment at the CERN LHC. JINST 3, S08002 (2008).
S. Acharya et al., ALICE Coll. Inclusive J/ф production at mid-rapidity in pp collisions at vs = 5.02 TeV. arXiv:1905.07211 [nucl-ex] (2019).
S. Acharya et al., ALICE Coll. Energy dependence of forward-rapidity J/ф and ф(2S) production in pp collisions at the LHC. Eur. Phys. J. C 77, 392 (2017).
S. Acharya et al., ALICE Coll. Measurement of the inclusive J/ф polarization at forward rapidity in pp collisions at vs = 8 TeV. Eur. Phys. J. C 78, 562 (2018).
S. Acharya et al., ALICE Coll. Inclusive J/ф production at forward and backward rapidity in p-Pb collisions at vSNN = 8.16 TeV. JHEP 07, 160 (2018).
X. Du, R. Rapp. In-medium charmonium production in proton-nucleus collisions. JHEP 03, 15 (2019). https://doi.org/10.1007/JHEP03(2019)015
S. Acharya et al., ALICE Coll. Search for collectivity with azimuthal J/ф-hadron correlations in high multiplicity p-Pb collisions at and vsNN = 5.02 and 8.16 TeV. Phys. Lett. B 780, 7 (2018).
V. Khachatryan et al., CMS Coll. Observation of long-range near-side angular correlations in proton-lead collisions at the LHC. Phys. Lett. B 718, 795 (2013).
S. Acharya et al., ALICE Coll. J/ф elliptic flow in Pb-Pb collisions at vsNN = 5.02 TeV. Phys. Rev. Lett. 119, 242301 (2017).
J. Adam et al., ALICE Coll. J/ф suppression at forward rapidity in Pb-Pb collisions at vsNN = 5.02 TeV. Phys. Lett. B 766, 212 (2017).
J. Adam et al., ALICE Coll. Measurement of an excess in the yield of J/ф at very low pT in Pb-Pb Collisions at vSNN = 2.76 TeV. Phys. Rev. Lett. 116, 222301 (2016).
S. Acharya et al., ALICE Coll. ?(1S) suppression at forward rapidity in Pb-Pb collisions at vsNN = 5.02 TeV. Phys. Lett. B 790, 89 (2019).
S. Acharya et al., ALICE Coll. Measurement of ?(1S) elliptic flow at forward rapidity in Pb-Pb collisions at vsNN = 5.02 TeV. arXiv:1907.03169 [nucl-ex] (2019).
Z. Citron et al. Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams. arXiv:1812.06772 [hep-ph] (2018).
How to Cite
License to Publish the Paper
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.
4.1. This Agreement is valid starting from the date of signature and acts for the entire period of the existence of the Journal.
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.