scholarly journals Quarkonium Production Measurements with the ALICE Detector at the LHC

2019 ◽  
Vol 64 (7) ◽  
pp. 566
Author(s):  
F. Fionda
Keyword(s):  
Nuclear Matter ◽  
Decay Channel ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Pp Collisions ◽  
Cold Nuclear Matter ◽  
Proton Proton ◽  
Matter Effects ◽  
Ion Collisions ◽  
Quarkonium Production

In (ultra-)relativistic heavy-ion collisions, the strongly interactingmatter is predicted to undergo a phase transition into a plasma of deconfinedquarks 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.

scholarly journals Small collision systems: Theory overview on cold nuclear matter effects

2018 ◽  
Vol 171 ◽  
pp. 11001
Author(s):  
Néstor Armesto
Keyword(s):  
Nuclear Matter ◽  
Particle Production ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Smooth Transition ◽  
Relativistic Heavy Ion Collider ◽  
Cold Nuclear Matter ◽  
Proton Proton ◽  
Small Systems ◽  
Matter Effects

Many observables measured at the Relativistic Heavy Ion Collider and the Large Hadron Collider show a smooth transition between proton-proton and protonnucleus collisions (small systems), and nucleus-nucleus collisions (large systems), when represented versus some variable like the multiplicity in the event. In this contribution I review some of the physics mechanisms, named cold nuclear matter effects, that may lead to a collective-like behaviour in small systems beyond the macroscopic description provided by relativistic hydrodynamics. I focus on the nuclear modification of parton densities, single inclusive particle production and correlations.

scholarly journals Nuclear modification of prompt and non-prompt J/Ψ production in p-Pb collisions at √SNN = 5.02 TeV with ALICE

2018 ◽  
Vol 192 ◽  
pp. 00018
Author(s):  
Giuseppe Trombetta
Keyword(s):  
Nuclear Matter ◽  
Decay Channel ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Energy Scale ◽  
Cold Nuclear Matter ◽  
Nuclear Modification ◽  
Ion Collisions ◽  
Central Rapidity ◽  
Theoretical Predictions

Various Cold Nuclear Matter (CNM) effects, such as nuclear shadowing or partonic energy loss, can modify the production of J/Ψ in heavy-ion collisions with respect to what is measured in elementary colliding systems. The study of p-Pb collisions at the Large Hadron Collider (LHC) energy scale represents a crucial tool to assess the influence of Cold Nuclear Matter on J/Ψ production in order to achieve a more correct interpretation of Pb-Pb collision results. The ALICE detector at the LHC is capable of reconstructing J/Ψ mesons at central rapidity through their e+e- decay channel down to zero transverse momentum (pT), and has measured the fraction of J/Ψ produced from the decay of beauty-flavoured hadrons (non-prompt J/Ψ) in p-Pb collisions down to pT = 1:3 GeV/c. In this paper, the results obtained by ALICE from the measurement of the prompt and non-prompt J/Ψ yields at mid-rapidity in p-Pb collisions at √SNN = 5.02 TeV will be discussed in comparison to different theoretical predictions including CNM effects.

Quarkonia in high energy nuclear collisions

2015 ◽  
Vol 24 (11) ◽  
pp. 1530015 ◽  
Author(s):  
Yunpeng Liu ◽  
Kai Zhou ◽  
Pengfei Zhuang
Keyword(s):  
Experimental Data ◽  
Nuclear Matter ◽  
Heavy Ion ◽  
High Energy ◽  
Nuclear Collisions ◽  
Matter Effects ◽  
Ion Collisions ◽  
Quarkonium Production ◽  
High Energy Collisions ◽  
Transport Approach

We first review the cold and hot nuclear matter effects on quarkonium production in high energy collisions, then discuss three kinds of models to describe the quarkonium suppression and regeneration: the sequential dissociation, the statistical production and the transport approach, and finally make comparisons between the models and the experimental data from heavy ion collisions at SPS, RHIC and LHC energies.

scholarly journals Quarkonium measurements in heavy-ion collisions with the STAR experiment

2018 ◽  
Vol 171 ◽  
pp. 18015
Author(s):  
Xinjie Huang
Keyword(s):  
Transverse Momentum ◽  
Nuclear Matter ◽  
Heavy Ion Collisions ◽  
Theoretical Calculations ◽  
Heavy Ion ◽  
Matter Effects ◽  
Nuclear Modification ◽  
Ion Collisions ◽  
Star Experiment ◽  
Nuclear Modification Factors

In these proceedings, we present the latest measurements of J/ψ and ϒ by the STAR experiment. The J/ψ and ϒ production measured in p+p collisions provide new baselines for similar measurements in Au+Au collisions, while the measurements in p+Au collisions can help quantify the cold nuclear matter effects. The J/ψ υ2 is measured in both U+U and Au+Au collisions to place constraints on the amount of J/ψ arising from recombination of deconfined charm and anti-charm pairs. Furthermore, the nuclear modification factors for ground and excited ϒ states as a function of transverse momentum and centrality are presented, and compared to those measured at the LHC as well as to theoretical calculations.

RAPIDITY AND AZIMUTHAL CORRELATION PATTERNS IN NUCLEON-NUCLEON AND RELATIVISTIC HEAVY ION COLLISIONS AT $\sqrt{s} = 200\, {\rm GeV}$

2007 ◽  
Vol 16 (10) ◽  
pp. 3379-3385 ◽  
Author(s):  
MEIJUAN WANG ◽  
YUANFANG WU
Keyword(s):  
Heavy Ion Collisions ◽  
System Size ◽  
Heavy Ion ◽  
Nucleon Nucleon ◽  
Relativistic Heavy Ion Collisions ◽  
Production Mechanism ◽  
Azimuthal Correlation ◽  
Pp Collisions ◽  
Ion Collisions

Rapidity and azimuthal correlation patterns for nucleon and relativistic heavy ion collisions are systematically studied by using PYTHIA for pp collisions, RQMD and AMPT for Au − Au collisions at [Formula: see text], respectively. The results show that the measures are sensitive to the collision particles, system size and production mechanism of the system.

Sign in / Sign up

Export Citation Format

Share Document