Catalytic φ meson production in heavy-ion collisions

Kolomeitsev, E. É.; Tomášik, Boris

doi:10.1088/0954-3899/36/9/095104

Cited by 14 publications

(26 citation statements)

References 61 publications

(156 reference statements)

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“…This is very surprising since the Ξ − yields observed above threshold at RHIC [33], at SPS [34] and even at AGS [35] are consistent with statistical model fits. In fact the same secondary pion-hyperon process π + Y → φ + Y , which was invoked by Kolomeitsev and Tomasik [36] to explain the enhanced φ yield, can here be the origin of the high Ξ production via the reaction π + Y → Ξ + K. To get a better understanding, we may have to move away from the SHM. One may calculate the probability for the production of two ss pairs in one collision.…”

Section: Comparison With Statistical Hadronizationmentioning

confidence: 83%

Hyperon production in Ar + KCl collisions at 1.76A GeV

Agakishiev¹,

Bałanda²,

Bannier³

et al. 2011

Eur. Phys. J. A

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Abstract. We present transverse momentum spectra, rapidity distribution and multiplicity of Λ-hyperons measured with the HADES spectrometer in the reaction Ar(1.76A GeV) + KCl. The yield of Ξ − is calculated from our previously reported Ξ − /(Λ+Σ 0 ) ratio and compared to other strange particle multiplicities. Employing a strangeness balance equation the multiplicities of the yet unmeasured Σ ± -hyperons can be estimated. Finally a statistical hadronization model is used to fit the yields of πThe resulting chemical freeze-out temperature of T = (76 ± 2) MeV is compared to the measured slope parameters obtained from fits to the transverse mass distributions of the different particles.

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Section: Comparison With Statistical Hadronizationmentioning

confidence: 83%

Hyperon production in Ar + KCl collisions at 1.76A GeV

Agakishiev¹,

Bałanda²,

Bannier³

et al. 2011

Eur. Phys. J. A

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“…One should furthermore keep in mind that mostly low-momentum pions are produced in 1A-2A GeV heavy-ion reactions while the φ production threshold is at p π = 1.56 GeV/c; in N + N collisions the production threshold is at 2.60 GeV. Consequently, the φ meson is produced subthreshold here ( < 0) and more complex, multistep processes involving short-lived resonances [46] and/or hyperons [47] might contribute. However, the ratio could also be influenced by final-state effects of the vector mesons in the nuclear medium (see, e.g., Ref.…”

Section: High-mass Pairs From ω Decaysmentioning

confidence: 99%

Dielectron production in Ar + KCl collisions at 1.76AGeV

Agakishiev¹,

Bałanda²,

Belver³

et al. 2011

Phys. Rev. C

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We present results on dielectron production in 40 Ar + KCl collisions at 1.76A GeV. For the first time ω mesons could be reconstructed in a heavy-ion reaction at a bombarding energy which is well below the production threshold in free nucleon-nucleon collisions. The ω multiplicity has been extracted and compared to the yields of other particles, in particular of the φ meson. At intermediate e + e − invariant masses, we find a strong enhancement of the pair yield over a reference spectrum from elementary nucleon-nucleon reactions, suggesting the onset of nontrivial effects of the nuclear medium. Transverse-mass spectra and angular distributions have been reconstructed in three invariant mass bins. In the former unexpectedly large slopes are found for high-mass pairs. The latter, in particular the helicity-angle distributions, are largely consistent with expectations for a pair cocktail dominated at intermediate masses by Dalitz decays.

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“…This is very surprising since the Ξ − yields observed above threshold at RHIC [30], at SPS [31] and even at AGS [32] are consistent with statistical model fits. In fact the same secondary pion-hyperon process π + Y → φ + Y , which was invoked by Kolomeitsev and Tomasik [33] to explain the enhanced φ yield, can here be the origin of the high Ξ production via the reaction π + Y → Ξ + K . These catalytic processes are not suppressed by the OZI rule due to the presence of a strange quark in the initial state of the reaction.…”

Section: The ξ − Hyperon and Catalytic Strangeness Productionmentioning

confidence: 61%

Investigating the microscopic properties of strongly interacting matter with HADES

Galatyuk¹,

Lorenz

2012

Open Physics

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Abstract:In the energy domain of 1-2 G V kinetic energy per nucleon, HADES has measured rare and penetrating probes in elementary and heavy ion collisions. Our results demonstrate that electron pair emission in C+C collisions can essentially be explained as a superposition of independent N+N collisions. HADES results on + − production in Ar+KCl collisions, however, show a strong enhancement of the dilepton yield relative to a reference spectrum obtained from elementary nucleon-nucleon reactions, signal the onset of medium effects beyond the superposition of individual N+N collisions. Intriguing results where also obtained from the reconstruction of hadrons with open and hidden strangeness. Analyses of the experimentally obtained hadronic yields measured in Ar+KCl allows to extract the chemical freeze-out conditions in the T -µ B phase diagram of strongly interacting matter. While the measured abundance of all reconstructed particles are well described assuming thermalization, the also reconstructed double strange baryon Ξ − appears about ten times more abundant than expected. This result will be discussed in the context of the exploration of the nuclear matter phase diagram in the region of finite density. Further investigations to search for significant medium effects, will be followed over the coming years with an upgraded HADES detector. PACS

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Catalytic φ meson production in heavy-ion collisions

Cited by 14 publications

References 61 publications

Hyperon production in Ar + KCl collisions at 1.76A GeV

Hyperon production in Ar + KCl collisions at 1.76A GeV

Dielectron production in Ar + KCl collisions at 1.76AGeV

Investigating the microscopic properties of strongly interacting matter with HADES

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