Energy dependence of phi meson production in central Pb+Pb collisions at sqrt(s_nn) = 6 to 17 GeV

Alt, C.; Anticic, T.; Baatar, B.; Barna, D.; Bartke, J.; Betev, L.; Bialkowska, H.; Blume, C.; Boimska, B.; Botje, M.; Bracinik, J.; Bramm, R.; Buncic, P.; Cerny, V.; Christakoglou, P.; Chung, P.; Chvala, O.; Cramer, J. G.; Csato, P.; Dinkelaker, P.; Eckardt, V.; Flierl, D.; Fodor, Z.; Foka, P.; Friese, V.; Gal, J.; Gazdzicki, M.; Genchev, V.; Georgopoulos, G.; Galadysz, E.; Grebieszkow, K.; Hegyi, S.; Hoehne, C.; Kadija, K.; Karev, A.; Kikola, D.; Kliemant, M.; Kniege, S.; Kolesnikov, V. I.; Kollegger, T.; Kornas, E.; Korus, R.; Kowalski, M.; Kraus, I.; Kreps, M.; Kresan, D.; Laszlo, A.; Lacey, R.; van Leeuwen, M.; Levai, P.; Litov, L.; Lungwitz, B.; Makariev, M.; Malakhov, A. I.; Mateev, M.; Melkumov, G. L.; Mischke, A.; Mitrovski, M.; Molnar, J.; Mrowczynski, St.; Nicolic, V.; Palla, G.; Panagiotou, A. D.; Panayotov, D.; Petridis, A.; Peryt, W.; Pikna, M.; Pluta, J.; Prindle, D.; Puehlhofer, F.; Renfordt, R.; Roland, C.; Roland, G.; Rybczynski, M.; Rybicki, A.; Sandoval, A.; Schmitz, N.; Schuster, T.; Seyboth, P.; Sikler, F.; Sitar, B.; Skrzypczak, E.; Slodkowski, M.; Stefanek, G.; Stock, R.; Strabel, C.; Stroebele, H.; Susa, T.; Szentpetery, I.; Sziklai, J.; Szuba, M.; Szymanski, P.; Trubnikov, V.; Varga, D.; Vassiliou, M.; Veres, G. I.; Vesztergombi, G.; Vranic, D.; Wetzler, A.; Walodarczyk, Z.; Yoo, I. K.; Zimanyi, J.

doi:10.48550/arxiv.0806.1937

Cited by 9 publications

(17 citation statements)

References 17 publications

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“…As noted in [12], several unique features of φ mesons (e.g. hidden strange particle, both hadronic and leptonic decay, not affected by resonance decays, mass and width are not modified in a medium [13] etc.) make it an ideal probe to investigate medium properties in heavy ion collisions.…”

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confidence: 81%

Nearly perfect fluid in Au + Au collisions at RHIC

Chaudhuri

2009

Physics Letters B

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In the Israel-Stewart's theory of dissipative hydrodynamics, we have analysed the STAR data on $\phi$ meson production in Au+Au collisions at $\sqrt{s}$=200 GeV. From a simultaneous fit to $\phi$ mesons multiplicity, mean $p_T$ and integrated $v_2$, we obtain a phenomenological estimate of QGP viscosity, $\eta/s =0.07 \pm 0.03 \pm 0.14$, the first error is due to the experimental uncertainty in STAR measurements, the second reflects the uncertainties in initial and final conditions of the fluid.Comment: 5 pages, 6 figures. Version accepted for publication in Phys. Lett.

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confidence: 81%

Nearly perfect fluid in Au + Au collisions at RHIC

Chaudhuri

2009

Physics Letters B

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“…This program implements the PDG [14] confirmed (4-star) set of particles and resonances, and we use [18] the recent determination of σmeson mass [19] (m σ = 484, Γ σ /2 = 255 MeV). The data set we use in table 1 is the latest NA49-2008 results [20], together with, as reference, AGS data set at their highest energy, see [21,18]. A star at λ s indicates that we fixed the value by strangeness conservation, which we do at AGS considering a small data set.…”

Section: Hadron Yields: Data and Fitsmentioning

confidence: 99%

Particle Production and Deconfinement Threshold

Rafelski

Letessier²

2012

Proceedings of VIIIth Conference Quark Confinement and the Hadron Spectrum — PoS(ConfinementVIII)

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We present a detailed analysis of the NA49 experimental particle yield results, and discuss the physical properties of the particle source. We explain in depth how our analysis differs from the work of other groups, what advance this implies in terms of our understanding, and what new physics about the deconfined particle source this allows us to recognize. We answer several frequently asked questions, presenting a transcript of a discussion regarding our data analysis. We show that the final NA49 data at 40, 80, 158 AGeV lead to a remarkably constant extensive thermal chemical-freeze-out properties of the fireball. We discuss briefly the importance of thermal hadronization pressure. 8th Conference Quark Confinement and the Hadron Spectrum

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“…Also they * E-mail:akc@veccal. are not affected by resonance decay, have both hadronic and leptonic decay channels, mass and width are not modified in a medium [17], etc. Let us note the most distinguishing feature between a confined and a deconfined state.…”

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confidence: 99%

“…NA49 and STAR collaboration have tabulated φ multiplicity and mean p T in Pb+Pb and Au+Au/Cu+Cu collisions in the energy range √ s= 6.3-200 GeV [17][18][19][20]. In Fig.…”

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confidence: 99%

“…To conclude, we have argued that the ratio of φ mesons multiplicity over cube of the mean p T corresponds to the degeneracy of the medium produced in relativistic heavy ion collisions and can signal the confinementdeconfinement phase transition. The ratio constructed from the existing data [17][18][19][20] in the energy range √ s=6.3-200 GeV, even though have large error bars, do show rapid rise from low SPS energy to high RHIC energy. Using a result of hydrodynamical analysis of φ mesons p T spectra [25], that the average initial temperature depend logarithmically on the collision energy, the collision energy dependence of the ratio is converted in to temperature dependence.…”

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Energy scan by ϕ mesons and threshold energy for the confinement–deconfinement phase transition

Chaudhuri

2010

Physics Letters B

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We argue that the ratio of φ mesons multiplicity over cube of the mean pT is proportional to the degeneracy of the medium produced in ultra-relativistic heavy ion collisions. The ratio extracted from the existing φ meson data in the energy range √ s=6.3-200 GeV, indicate that beyond a threshold energy √ s th = 15.74 ± 8.10 GeV, the medium crosses over from a confined phase to a deconfined phase.PACS numbers: 25.75.Nq, 25.75.Ag Lattice QCD predicts [1,2] that in ultra-relativistic heavy ion collisions, a confinement-deconfinement phase transition can occur, producing a new state of matter, Quark-Gluon Plasma (QGP). QGP is a collective state where color degrees of freedom become manifest over nuclear rather than hadronic volume. Recent experiments [3-6] have produced convincing evidences for a confinement-deconfinement phase transition in √ s=200 GeV Au+Au collisions at RHIC. One naturally wonders, whether or not there is a threshold energy for the transition. One of the aims of the STAR's energy scan programme at RHIC is to determine the threshold energy for the confinement-deconfinement transition [7,8]. STAR proposes to study nuclear collisions at √ s=5, 7.7, 11.5, 17.3, 27 and 39 GeV. With the existing data at √ s=62,130 and 200 GeV, STAR will scan a large energy range, √ s=5-200 GeV. For long, strangeness enhancement is considered as a signature of QGP formation [9]. In QGP environment, gg → ss is abundant. If not annihilated before hadronisation, early produced strange and anti-strange quarks will coalesce in to form strange hadrons and compared to elementary pp collisions, strange particle production will be enhanced. However, strangeness enhancement could also be obtained in a purely hadronic scenario, mainly due to the 'volume effect' [10][11][12][13]. Strangeness production in small volume elementary pp collisions can be 'canonically' suppressed due to 'strict' strangeness conservation [10][11][12][13]. In bigger volume AA collisions, locally, strangeness conservation condition can be relaxed to produce strange particles. In the language of statistical mechanics, while canonical ensemble is applicable in pp collisions, grand canonical ensemble is more appropriate in heavy ion collisions. Additionally, strange particle phase space appears to be under-saturated in elementary pp or peripheral heavy ion collisions [14,15].As noted in [16], several unique features of φ mesons make it an ideal probe to investigate medium properties in heavy ion collisions. They are hidden strange particle and are not affected by canonical suppression. Also they *

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Energy dependence of phi meson production in central Pb+Pb collisions at sqrt(s_nn) = 6 to 17 GeV

Cited by 9 publications

References 17 publications

Nearly perfect fluid in Au + Au collisions at RHIC

Nearly perfect fluid in Au + Au collisions at RHIC

Particle Production and Deconfinement Threshold

Energy scan by ϕ mesons and threshold energy for the confinement–deconfinement phase transition

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