Darstellungsformen von Medizingeschichte im Fernsehen

Bleicher, Joan Kristin

doi:10.5771/1615-634x-2003--366

Cited by 8 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both of these scenarios would generally result in a suppression, rather than an enhancement, of directly detectable resonances. Transport model studies done on resonances generally confirm this [28,29] The observation of an enhanced µ + µ − continuum around the ρ peak [30] has been pointed to as evidence of ρ broadening, which in turn would signify a long hadronic re-interaction phase [30]. The absence of a broadening in the nominal peak itself, prevents us from considering this as the unique interpretation of experimental data.…”

Section: Statistical Model Descriptions Of Particle Yieldsmentioning

confidence: 82%

Resonances and fluctuations of strange particles in 200 GeV Au–Au collisions

Torrieri¹

2006

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

Abstract. We perform an analysis of preliminary data on strange particles yields and fluctuations within the Statistical hadronization model. We begin by describing the theoretical disagreements between different statistical models currently on the market. We then show how the simultaneous analysis of yields and fluctuations can be used to differentiate between the different models, and determine if one of them can be connected to underlying physics. We perform a study on a RHIC 200 GeV data sample that includes stable particles, resonances, and the event-by-event fluctuation of the K/π ratio. We show that the equilibrium statistical model can not describe the fluctuation, unless an unrealistically small volume is assumed. Such small volume then makes it impossible to describe the total particle multiplicity. The non-equilibrium model,on the other hand, describes both the K/π fluctuation and yields acceptably due to the extra boost to the π fluctuation provided by the high pion chemical potential. Λ(1520) and K * abundance is described within error bars, but the Σ * is under-predicted to ∼ 1.5 standard deviations. We suggest further measurements that have the potential to test the non-equilibrium model, as well as gauge the effect of re-interactions between hadronization and freeze-out PACS numbers: 24.10.Pa

show abstract

Section: Statistical Model Descriptions Of Particle Yieldsmentioning

confidence: 82%

Resonances and fluctuations of strange particles in 200 GeV Au–Au collisions

Torrieri¹

2006

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

show abstract

“…the direct reconstruction of the invariant mass spectra of the resonances from 2-and 3-particle pion correlations. Over the last years the exploration of resonance yields and spectra from hadron correlation has attracted a great amount of experimental [1,2,3,4,5,6,7,8] and theoretical attention [9,10,11,12,13,14,15,16,17,18].…”

mentioning

confidence: 99%

Reconstructingρ0and ω mesons from nonleptonic decays in C+C collisions at 2 GeV/nucleon in transport model calculations

Vogel

Bleicher

2006

Phys. Rev. C

View full text Add to dashboard Cite

We predict transverse and longitudinal momentum spectra and yields of ρ 0 and ω mesons reconstructed from hadron correlations in C+C reactions at 2 AGeV. The rapidity and p T distributions for reconstructable ρ 0 mesons differs strongly from the primary distribution, while the ω's distributions are only weakly modified. We discuss the temporal and spatial distributions of the particles emitted in the hadron channel. Finally, we report on the mass shift of the ρ 0 due to its coupling to the N * (1520), which is observable in both the di-lepton and ππ channel. Our calculations can be tested with the Hades experiment at GSI, Darmstadt.The Hades spectrometer at GSI opens the possibility to measure di-lepton yields and spectra at moderate energies with unprecedented accuracy. However, in addition it allows also to get complimentary information on the most interesting di-lepton sources (the ρ 0 and ω mesons) directly from the reconstruction of their hadronic decay products. I.e. the direct reconstruction of the invariant mass spectra of the resonances from 2-and 3-particle pion correlations. Over the last years the exploration of resonance yields and spectra from hadron correlation has attracted a great amount of experimental [1,2,3,4,5,6,7,8] and theoretical attention [9,10,11,12,13,14,15,16,17,18].Detailed experimental studies of hadron resonances at the full SPS and highest RHIC energy [1,2,3,4,5,6,7,8] have recently been performed. Theoretically there are still unsolved problems concerning the absorption and regeneration of resonances after chemical decoupling of the system. It is expected that the inclusion of pseudoelastic interactions between chemical and kinetic freezeout might solve some discrepancies of statistical models for resonance yields at high energies [19,20,21]. At low energies, the first experimental investigations of resonances are eagerly awaited to explore in-medium effects on vector mesons near nuclear groundstate densities in the 1-2 AGeV beam energy range.Especially resonances that have electromagnetic and hadronic decay channels allow deeper insights into the dynamics and lifetimes of the hot and dense hadronic matter stage created in light and heavy ion reactions. That is because the leptonic decay channel carries information from the early stages of the reaction, since the leptons can leave the dense regions undisturbed, while the hadronic decay channel triggers on the late stages (near kinetic decoupling) of the evolution.For our studies we apply the UrQMD model. It is a non-equilibrium transport approach based on the covariant propagation of hadrons and strings. All cross sections are calculated by the principle of detailed balance

show abstract

“…This permits to explore the emission patterns of resonances in detail and to gain insight into their origins and decay channels. For previous studies of resonances within this model see [14][15][16][17][18][19][20][21][22][23] the UrQMD model the reader is referred to [26,27]. Recent development concerning the inclusion of a hydrodynamic phase are described in [28].…”

Section: Model Descriptionmentioning

confidence: 99%

“…[5,6]) and the transition from a possibly decon ned phase to a hadronic phase is quite poorly understood. Resonances provide an unique approach to learn about the hot and dense phase which is produced in heavy ion collisions [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Since most hadronic resonances decay on time scales of several fm/c, plenty of short-lived resonances will decay within the created medium and will carry the information from that stage of the collision.…”

Section: Introductionmentioning

confidence: 99%