24 research outputs found
Hostages, rents and contractual specificity
Paper presented at 1. Meeting of UK Economics of Law Study Group held Nottingham (GB), 28 Jan 1997SIGLEAvailable from British Library Document Supply Centre-DSC:6224.938(97/4) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Low- direct-photon production in AuAu collisions at and 62.4 GeV
The measurement of direct photons from AuAu collisions at and 62.4 GeV in the transverse-momentum range Gev/ is presented by the PHENIX collaboration at the Relativistic Heavy Ion Collider. A significant direct-photon yield is observed in both collision systems. A universal scaling is observed when the direct-photon spectra for different center-of-mass energies and for different centrality selections at GeV is scaled with for . This scaling also holds true for direct-photon spectra from AuAu collisions at GeV measured earlier by PHENIX, as well as the spectra from PbPb at GeV published by ALICE. The scaling power seems to be independent of , center of mass energy, and collision centrality. The spectra from different collision energies have a similar shape up to of 2 GeV/. The spectra have a local inverse slope increasing with of GeV/ in the range GeV/ and increasing to GeV/ for GeV/. The observed similarity of low- direct-photon production from to 2760 GeV suggests a common source of direct photons for the different collision energies and event centrality selections, and suggests a comparable space-time evolution of direct-photon emission
Low- direct-photon production in AuAu collisions at and 62.4 GeV
The measurement of direct photons from AuAu collisions at and 62.4 GeV in the transverse-momentum range Gev/ is presented by the PHENIX collaboration at the Relativistic Heavy Ion Collider. A significant direct-photon yield is observed in both collision systems. A universal scaling is observed when the direct-photon spectra for different center-of-mass energies and for different centrality selections at GeV is scaled with for . This scaling also holds true for direct-photon spectra from AuAu collisions at GeV measured earlier by PHENIX, as well as the spectra from PbPb at GeV published by ALICE. The scaling power seems to be independent of , center of mass energy, and collision centrality. The spectra from different collision energies have a similar shape up to of 2 GeV/. The spectra have a local inverse slope increasing with of GeV/ in the range GeV/ and increasing to GeV/ for GeV/. The observed similarity of low- direct-photon production from to 2760 GeV suggests a common source of direct photons for the different collision energies and event centrality selections, and suggests a comparable space-time evolution of direct-photon emission
Low- direct-photon production in AuAu collisions at and 62.4 GeV
The measurement of direct photons from AuAu collisions at and 62.4 GeV in the transverse-momentum range Gev/ is presented by the PHENIX collaboration at the Relativistic Heavy Ion Collider. A significant direct-photon yield is observed in both collision systems. A universal scaling is observed when the direct-photon spectra for different center-of-mass energies and for different centrality selections at GeV is scaled with for . This scaling also holds true for direct-photon spectra from AuAu collisions at GeV measured earlier by PHENIX, as well as the spectra from PbPb at GeV published by ALICE. The scaling power seems to be independent of , center of mass energy, and collision centrality. The spectra from different collision energies have a similar shape up to of 2 GeV/. The spectra have a local inverse slope increasing with of GeV/ in the range GeV/ and increasing to GeV/ for GeV/. The observed similarity of low- direct-photon production from to 2760 GeV suggests a common source of direct photons for the different collision energies and event centrality selections, and suggests a comparable space-time evolution of direct-photon emission
Low- direct-photon production in AuAu collisions at and 62.4 GeV
The measurement of direct photons from AuAu collisions at and 62.4 GeV in the transverse-momentum range Gev/ is presented by the PHENIX collaboration at the Relativistic Heavy Ion Collider. A significant direct-photon yield is observed in both collision systems. A universal scaling is observed when the direct-photon spectra for different center-of-mass energies and for different centrality selections at GeV is scaled with for . This scaling also holds true for direct-photon spectra from AuAu collisions at GeV measured earlier by PHENIX, as well as the spectra from PbPb at GeV published by ALICE. The scaling power seems to be independent of , center of mass energy, and collision centrality. The spectra from different collision energies have a similar shape up to of 2 GeV/. The spectra have a local inverse slope increasing with of GeV/ in the range GeV/ and increasing to GeV/ for GeV/. The observed similarity of low- direct-photon production from to 2760 GeV suggests a common source of direct photons for the different collision energies and event centrality selections, and suggests a comparable space-time evolution of direct-photon emission
Low- direct-photon production in AuAu collisions at and 62.4 GeV
The measurement of direct photons from AuAu collisions at and 62.4 GeV in the transverse-momentum range Gev/ is presented by the PHENIX collaboration at the Relativistic Heavy Ion Collider. A significant direct-photon yield is observed in both collision systems. A universal scaling is observed when the direct-photon spectra for different center-of-mass energies and for different centrality selections at GeV is scaled with for . This scaling also holds true for direct-photon spectra from AuAu collisions at GeV measured earlier by PHENIX, as well as the spectra from PbPb at GeV published by ALICE. The scaling power seems to be independent of , center of mass energy, and collision centrality. The spectra from different collision energies have a similar shape up to of 2 GeV/. The spectra have a local inverse slope increasing with of GeV/ in the range GeV/ and increasing to GeV/ for GeV/. The observed similarity of low- direct-photon production from to 2760 GeV suggests a common source of direct photons for the different collision energies and event centrality selections, and suggests a comparable space-time evolution of direct-photon emission
Dielectron production in AuAu collisions at =200 GeV
International audienceWe present measurements of e+e− production at midrapidity in Au+Au collisions at sNN=200 GeV. The invariant yield is studied within the PHENIX detector acceptance over a wide range of mass (mee<5 GeV/c2) and pair transverse momentum (pT<5 GeV/c) for minimum bias and for five centrality classes. The e+e− yield is compared to the expectations from known sources. In the low-mass region (mee=0.30–0.76 GeV/c2) there is an enhancement that increases with centrality and is distributed over the entire pair pT range measured. It is significantly smaller than previously reported by the PHENIX experiment and amounts to 2.3±0.4(stat)±0.4(syst)±0.2(model) or to 1.7±0.3(stat)±0.3(syst)±0.2(model) for minimum bias collisions when the open heavy-flavor contribution is calculated with pythia or mc@nlo, respectively. The inclusive mass and pT distributions, as well as the centrality dependence, are well reproduced by model calculations where the enhancement mainly originates from the melting of the ρ meson resonance as the system approaches chiral symmetry restoration. In the intermediate-mass region (mee=1.2–2.8 GeV/c2), the data hint at a significant contribution in addition to the yield from the semileptonic decays of heavy-flavor mesons