Charged Particle Multiplicities at BRAHMS

Bearden, I.G.; Beavis, D.; Beşliu, C.; Blyakhman, Y.; Brzychczyk, J.; Budick, B.; Bøggild, H.; Chasman, C.; Christensen, C. H.; Christiansen, P.; Cibor, J.; Debbe, R.; Gaardhøje, J. J.; Grotowski, K.; Hagel, K.; Hansén, O.; Holm, Anders; Holme, A.K.; Ito, H.; Jakobsen, Emil; Jipa, Al.; Jørdre, J. I.; Jundt, F.; Jørgensen, C. E.; Keutgen, T.; Kim, E. J.; Kozik, T.; Larsen, T. M.; Lee, J. H.; Lee, Y. K.; Løvhøiden, G.; Majka, Z.; Makeev, A.; McBreen, B.; Murray, M.; Natowitz, J. B.; Nielsen, B.S.; Olchanski, K.; Olness, J.W.; Ouerdane, D.; Płaneta, R.; Rami, F.; Röhrich, D.; Samset, B. H.; Sanders, S.; Sheetz, R. A.; Sosin, Z.; Staszel, P.; Thorsteinsen, T.F.; Tveter, T. S.; Videbæk, F.; Wada, Ryoichi; Wieloch, A.; Zgura, I. S.

doi:10.1556/aph.15.2002.3-4.14

Cited by 56 publications

(110 citation statements)

References 11 publications

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“…First, higher energies entail larger charged particle multiplicities per unit rapidity, dN ch /dy. In central Au+Au collisions at full RHIC energy ( √ s = 200 AGeV) experiments have found [60,61] about a factor of 2 increase as compared to maximum SPS energy ( √ s = 17.3 AGeV). Extrapolations into the LHC regime ( √ s = 5500 AGeV) suggest another factor of up to ∼4 enhancement over the RHIC results.…”

Section: Rhic and Lhcmentioning

confidence: 99%

Hadronic production of thermal photons

2004

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We study the thermal emission of photons from hot and dense strongly interacting hadronic matter at temperatures close to the expected phase transition to the Quark-Gluon Plasma (QGP). Earlier calculations of photon radiation from ensembles of interacting mesons are re-examined with additional constraints, including new production channels as well as an assessment of hadronic form factor effects. Whereas strangeness-induced photon yields turn out to be moderate, the hitherto not considered t-channel exchange of ω-mesons is found to contribute appreciably for photon energies above ∼ 1.5 GeV. The role of baryonic effects is assessed using existing many-body calculations of lepton pair production. We argue that our combined results constitute a rather realistic emission rate, appropriate for applications in relativistic heavy-ion collisions. Supplemented with recent evaluations of QGP emission, and an estimate for primordial (hard) production, we compute photon spectra at SPS, RHIC and LHC energies.

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Section: Rhic and Lhcmentioning

confidence: 99%

Hadronic production of thermal photons

2004

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“…As the collision energy has increased with the advent of new relativistic heavy-ion accelerators, from AGS energies ( √ s NN ≤ 4.9 GeV) to those achieved with the SPS ( √ s NN ≤ from one that is baryon rich to one dominated by mesons [1,2,3,4]. This change is evident in the increase of central rapidity densities of emitted pions and kaons accompanied by the simultaneous shift of the net-baryon peak one or two units of rapidity down from beam rapidity.…”

Section: Introductionmentioning

confidence: 99%

“…This change is evident in the increase of central rapidity densities of emitted pions and kaons accompanied by the simultaneous shift of the net-baryon peak one or two units of rapidity down from beam rapidity. Due to this shift, the net-baryon peak gradually moves from mid-rapidity (AGS and SPS) [5,6] towards high rapidity (RHIC) [7], leaving a relatively net-baryon poor region at mid-rapidity at the highest RHIC energy. At AGS energies, the observed ratio of strange particles to pions in A+A collisions is larger than that measured in either p+p or p+A collisions and this ratio increases significantly with beam energy [2,8,9].…”

Section: Introductionmentioning

confidence: 99%

Kaon and pion production in central Au + Au collisions at sNN=62.4 GeV

et al. 2010

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Invariant p T spectra and rapidity densities covering a large rapidity range (−0.1 < y < 3.5) are presented for π ± and K ± mesons from central Au+Au collisions at √ s NN = 62.4 GeV. The mid-rapidity yields of meson particles relative to their anti-particles are found to be close to unity (π85) while the anti-proton to proton ratio isp/p ∼ 0.49. The rapidity dependence of the π − /π + ratio is consistent with a small increase towards forward rapidities while the K − /K + andp/p ratios show a steep decrease to ∼ 0.3 for kaons and 0.022 for protons at y ∼ 3. It is observed that the kaon production relative to its own anti-particle as well as to pion production in wide rapidity and energy ranges shows an apparent universal behavior consistent with the baryo-chemical potential, as deduced from thep/p ratio, being the driving parameter.

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“…Experimental data on hadron yields and ratios in the midrapidity range in central gold-gold collisions at √ s = 130 AGeV became available recently [38,39,40,41,42,43,44,45]. These data are listed in Table V together with the predictions of the SM and TSM.…”

Section: Hadron Production At Rhicmentioning

confidence: 99%

Analysis of particle production in ultrarelativistic heavy-ion collisions within a two-source statistical model

et al. 2002

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The experimental data on hadron yields and ratios in central lead-lead and gold-gold collisions at 158 AGeV/c (SPS) and √ s = 130 AGeV (RHIC), respectively, are analysed within a two-source statistical model of an ideal hadron gas. A comparison with the standard thermal model is given. The two sources, which can reach the chemical and thermal equilibrium separately and may have different temperatures, particle and strangeness densities, and other thermodynamic characteristics, represent the expanding system of colliding heavy ions, where the hot central fireball is embedded in a larger but cooler fireball. The volume of the central source increases with rising bombarding energy. Results of the two-source model fit to RHIC experimental data at midrapidity coincide with the results of the one-source thermal model fit, indicating the formation of an extended fireball, which is three times larger than the corresponding core at SPS.

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Charged Particle Multiplicities at BRAHMS

Cited by 56 publications

References 11 publications

Hadronic production of thermal photons

Hadronic production of thermal photons

Kaon and pion production in central Au + Au collisions at sNN=62.4 GeV

Analysis of particle production in ultrarelativistic heavy-ion collisions within a two-source statistical model

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