Monte Carlo model for nuclear collisions from SPS to LHC energies

Amelin, N.S.; Armesto, N.; Pajares, C.; Sousa, D.

doi:10.1007/s100520100761

Cited by 83 publications

(101 citation statements)

References 41 publications

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“…The number of strings, < N s >, can be obtained from the SFM code [24], a Monte Carlo code based on the quark gluon string model, similar to the Dual Parton Model [25] or EPOS [26]. Moreover, the value of N s can also be calculated analytically [27]…”

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confidence: 99%

High multiplicityppevents andJ/ψproduction at energies available at the CERN Large Hadron Collider

Ferreiro

Pajares

2012

Phys. Rev. C

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We discuss the dependence of J/ψ production on the charged particle multiplicity in proton-proton collisions at LHC energies. We show that, in the framework of parton saturation or string interaction models, the hard J/ψ production exhibits a significant growth with the multiplicity, which is stronger than linear in the high density domain. This departure from linearity, that should affect any hard observable, applies for high multiplicity proton-proton collisions in the central rapidity region and is a consequence of the parton saturation or the strong interaction among colour ropes that take place at LHC energies. Our assumption, the existence of coherence effects present in proton-proton collisions at high energy, can also be checked by studying the particular shape of the probability distribution associated to the J/ψ production.RHIC [1,2,3,4] and LHC [5,6,7] data on heavy-ion collisions have shown several important features which indicate the formation of a high density partonic medium with characteristic properties as the low shear viscosity and high opacity. Since the energy density achieved in high multiplicity events produced in pp collisions at LHC is comparable to the reached density in CuCu central collisions or AuAu peripheral collisions at √ s N N = 200 GeV, it is pertinent to wonder about the possibility to obtain a similar high density medium which would be reflected in experimental observables, similar to heavy-ion collisions. An illustration of this would be the predicted ridge structure [8,9] observed by CMS collaboration [10] in pp collisions. Also, the eventuality that other observables, as long range rapidity correlations [11,12,13], energy loss [14], or the elliptic flow [15,16], are measurable in pp collisions, has been reckoned with in different frameworks.We address here to the J/ψ production in high multiplicity pp collisions. We will show that the rise of J/ψ production in the highest multiplicity events observed by the ALICE collaboration [17] can be naturally explained as a consequence of string interaction or parton saturation. This feature is particularly important, since, due to the absence of nuclear effects in this case, it can be use as a baseline in order to disentangle different mechanism that are expected in heavy-ion collisions, as the J/ψ suppression due to sequential dissociation [18] or the J/ψ enhancement due to the recombination of uncorrelated c andc quarks [19].

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confidence: 99%

High multiplicityppevents andJ/ψproduction at energies available at the CERN Large Hadron Collider

Ferreiro

Pajares

2012

Phys. Rev. C

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“…Nevertheless, these effects are mainly noticeable at central rapidities, the very forward and very backward regions being only slightly affected [18]. Results of the program PSM for cross sections, multiplicities, longitudinal and transverse momentum spectra and production of different hadron species can be found in [10], together with an extensive comparison to accelerator data. In Fig.…”

Section: Hadronic Modelsmentioning

confidence: 96%

Collective behavior in nuclear interactions and shower development

Canoa

Armesto

Pajares

et al. 2005

Astroparticle Physics

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The mechanism of hadronic interactions at very high energies is still unclear. Available accelerator data constrain weakly the forward rapidity region which determines the development of atmospheric showers. This ignorance is one of the main sources of uncertainty in the determination of the energy and composition of the primary in hadron-induced atmospheric showers. In this paper we examine the effect on the shower development of two kinds of collective effects in high-energy hadronic interactions which modify the production of secondary particles. The first mechanism, modeled as string fusion, affects strongly the central rapidity region but only slightly the forward region and is shown to have very little effect on the shower development. The second mechanism implies a very strong stopping; it affects modestly the profile of shower maximum but broadens considerably the number distribution of muons at ground. For the latter mechanism, the development of air showers is faster mimicking a heavier projectile. On the other hand, the number of muons at ground is lowered, resembling a shower generated by a lighter primary.

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“…For diquark we consider m qq =450 MeV [53]. Taking for constituent quark masses of light non-strange quark M u,d = 230 MeV, strange quark M s =350 MeV [54], and diquark mass M qq =550 ± 50 MeV as in Ref. [53], it is obvious that the masses of (di)quark and strange quark will be substantially reduced at the chiral phase transition.…”

Section: A Junction Anti-junction Loopsmentioning

confidence: 99%

Transient field fluctuations effects ind+Auand Au+Au collisions atsNN=200
Pop
¹
,
Gyulassy
²
,
Barrette
³

et al. 2007
Phys. Rev. C
21
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0
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The effect of fluctuations of strong color electric fields (SCF) on the baryon production in d+Au and Au+Au collisions at 200A GeV is studied in the framework of the HIJING/BB v2.0 model. It is shown that the dynamics of the production process deviates considerably from calculations based on Schwinger-like estimates for homogeneous and constant color fields. An increase of the string tension from κ0 = 1 GeV/fm, to in medium mean values of 1.5 to 2.0 GeV/fm and 2.0 to 3.0 GeV/fm for d+Au and Au+Au, respectively, results in a consistent description of the observed nuclear modification factors R dAu and RAuAu (that relates (d)Au+Au and p+p collisions), and point to the relevance of fluctuations of transient color fields. The differences between nuclear modification factors RAuAu and RCP (that relates central and peripheral collisions) are also discussed. The measurement of multi-strange (anti)hyperons (Ξ, Ω) yields would provide a crucial test of the importance of SCF fluctuations at RHIC energies.

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Monte Carlo model for nuclear collisions from SPS to LHC energies

Cited by 83 publications

References 41 publications

High multiplicityppevents andJ/ψproduction at energies available at the CERN Large Hadron Collider

High multiplicityppevents andJ/ψproduction at energies available at the CERN Large Hadron Collider

Collective behavior in nuclear interactions and shower development

Transient field fluctuations effects ind+Auand Au+Au collisions atsNN=200
Pop
¹
,
Gyulassy
²
,
Barrette
³

et al. 2007
Phys. Rev. C
21
0
9
0
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Monte Carlo model for nuclear collisions from SPS to LHC energies

Cited by 83 publications

References 41 publications

High multiplicityppevents andJ/ψproduction at energies available at the CERN Large Hadron Collider

High multiplicityppevents andJ/ψproduction at energies available at the CERN Large Hadron Collider

Collective behavior in nuclear interactions and shower development

Transient field fluctuations effects ind+Auand Au+Au collisions atsNN=200Pop1, Gyulassy2, Barrette3 et al. 2007Phys. Rev. C21090View full textAdd to dashboardCite

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Transient field fluctuations effects ind+Auand Au+Au collisions atsNN=200
Pop
¹
,
Gyulassy
²
,
Barrette
³

et al. 2007
Phys. Rev. C
21
0
9
0
View full text Add to dashboard Cite