scholarly journals Direct comparison of phase-space distributions of K- and K+ mesons in heavy-ion collisions at SIS energies -- evidence for in-medium modifications of kaons?

2000 ◽  
Vol 9 (4) ◽  
pp. 515-519 ◽  
Author(s):  
K. Wiśniewski ◽  
◽  
P. Crochet ◽  
N. Herrmann ◽  
A. Andronic ◽  
...  
Keyword(s):  
Phase Space ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Medium Modifications ◽  
K Mesons

scholarly journals Di-electron production from vector mesons with medium modifications in heavy ion collisions

2012 ◽  
Vol 85 (2) ◽  
Author(s):  
Hao-jie Xu ◽  
Hong-fang Chen ◽  
Xin Dong ◽  
Qun Wang ◽  
Yi-fei Zhang
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Vector Mesons ◽  
Ion Collisions ◽  
Electron Production ◽  
Medium Modifications

scholarly journals Phase-space density in heavy-ion collisions revisited

2003 ◽  
Vol 30 (4) ◽  
pp. 517-523 ◽  
Author(s):  
Q. H. Zhang ◽  
J. Barrette ◽  
C. Gale
Keyword(s):  
Phase Space ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Phase Space Density ◽  
Space Density ◽  
Ion Collisions

scholarly journals The global geometrical property of jet events in high-energy nuclear collisions

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Shi-Yong Chen ◽  
Wei Dai ◽  
Shan-Liang Zhang ◽  
Qing Zhang ◽  
Ben-Wei Zhang
Keyword(s):  
Energy Loss ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
High Energy ◽  
Jet Quenching ◽  
Relativistic Heavy Ion Collisions ◽  
Parton Energy Loss ◽  
Boltzmann Transport ◽  
Ion Collisions ◽  
Medium Modifications

AbstractWe present the first theoretical study of medium modifications of the global geometrical pattern, i.e., transverse sphericity ($$S_{\perp }$$ S ⊥ ) distribution of jet events with parton energy loss in relativistic heavy-ion collisions. In our investigation, POWHEG + PYTHIA is employed to make an accurate description of transverse sphericity in the p + p baseline, which combines the next-to-leading order (NLO) pQCD calculations with the matched parton shower (PS). The Linear Boltzmann Transport (LBT) model of the parton energy loss is implemented to simulate the in-medium evolution of jets. We calculate the event normalized transverse sphericity distribution in central Pb + Pb collisions at the LHC, and give its medium modifications. An enhancement of transverse sphericity distribution at small $$S_{\perp }$$ S ⊥ region but a suppression at large $$S_{\perp }$$ S ⊥ region are observed in A + A collisions as compared to their p + p references, which indicates that in overall the geometry of jet events in Pb + Pb becomes more pencil-like. We demonstrate that for events with 2 jets in the final-state of heavy-ion collisions, the jet quenching makes the geometry more sphere-like with medium-induced gluon radiation. However, for events with $$\ge 3$$ ≥ 3 jets, parton energy loss in the QCD medium leads to the events more pencil-like due to jet number reduction, where less energetic jets may lose their energies and then fall off the jet selection kinematic cut. These two effects offset each other and in the end result in more jetty events in heavy-ion collisions relative to that in p + p.

POPULATION OF MULTI-QUARK STATES IN EXOTIC MULTIPLETS AND THERMALIZATION IN ULTRA-RELATIVISTIC HEAVY ION COLLISIONS

2008 ◽  
Vol 17 (06) ◽  
pp. 965-1014 ◽  
Author(s):  
STEFAN SCHERER ◽  
MARCUS BLEICHER ◽  
STEPHANE HAUSSLER ◽  
HORST STÖCKER
Keyword(s):  
Phase Space ◽  
Thermal Model ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Recent Discussion ◽  
Ion Collisions ◽  
Model Predictions ◽  
Exotic Hadrons ◽  
Equal Population

The recent discussion about experimental evidence for pentaquark states has revitalized the interest in exotic hadrons. If such states really exist, it is natural to assume that they will be formed at the late hadronization stage of ultra-relativistic heavy ion collisions, given the success of quark recombination models in the description of hadronization. Here, we apply the qMD model to study the formation of color neutral exotic multi-quark clusters at hadronization. We search for color neutral clusters made up of up to six color charges, respectively. We thus obtain estimates for the numbers and phase space distributions of exotic hadronic states produced by clustering in heavy ion collisions, including the members of the pentaquark multiplets. We obtain particle abundances that are smaller than thermal model predictions. Moreover, the results obtained in recombination from ultra-relativistic heavy ion collisions can be compared to the estimates based on equal population of the corresponding multiplets, and to results from fully thermalized systems. We find that the distribution of exotic hadrons from recombination over large multiplets provides a sensitive signal for thermalization and decorrelation of the initial, non-equilibrium state of the collision.

Semi-classical approaches to the phase space evolutions in intermediate energy heavy ion collisions

1986 ◽  
Vol 447 ◽  
pp. 555-567 ◽  
Author(s):  
B. Remaud ◽  
F. Sebille ◽  
C. Gregoire ◽  
L. Vinet ◽  
Y. Raffray
Keyword(s):  
Phase Space ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Intermediate Energy ◽  
Ion Collisions

Phase space model of hard-photon production in heavy-ion collisions

1990 ◽  
Vol 103 (2) ◽  
pp. 309-316 ◽  
Author(s):  
A. Bonasera ◽  
G. F. Burgio ◽  
F. Gulminelli ◽  
H. H. Wolter
Keyword(s):  
Phase Space ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Photon Production ◽  
Hard Photon ◽  
Space Model ◽  
Ion Collisions ◽  
Phase Space Model
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