| 1. |
- Averbeck, R., et al.
(författare)
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The viscosity to entropy ratio from PHENIX data on single electron production
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35
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Tidskriftsartikel (refereegranskat)abstract
- The PHENIX experiment has measured electrons from the decay of hadrons carrying heavy flavor (charm or bottom quarks) in p + p and Au + Au collisions at at the Relativistic Heavy Ion Collider (RHIC). The strong damping of heavy-flavor motion through the medium is reflected in a substantial suppression at high pT and a large azimuthal anisotropy v2 of such electrons in Au + Au collisions at RHIC. By requiring a simultaneous description of the nuclear modification factor RAA(pT) and the azimuthal anisotropy v2(pT) in transport models, the viscosity to entropy density ratio of the medium can be estimated as η/s (1.3–2)(1/4π), which is close to the conjectured lower quantum bound and, therefore, near a perfect fluid.
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| 2. |
- Awes, T., et al.
(författare)
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Highlights from PHENIX II
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35
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Tidskriftsartikel (refereegranskat)abstract
- This contribution highlights recent results from the PHENIX Collaboration at RHIC with emphasis on those obtained through lepton and photon measurements in PHENIX.
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| 3. |
- Baumann, C., et al.
(författare)
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Search for direct photons in p+Pb and p+C collisions at sqrt(snn) = 17.4 GeV
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35
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Tidskriftsartikel (refereegranskat)abstract
- Upper limits on direct photon production were determined as a function of the transverse momentum for 0.7 < pT ≤ 3.2 GeV/c with the WA98 experiment in p + C and p + Pb collisions at . The results are compared to direct photon measurements in Pb + Pb collisions at by WA98. Implications for a possible thermal direct photon contribution are discussed.
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| 4. |
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| 5. |
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| 6. |
- Espagnon, B., et al.
(författare)
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The ALICE muon spetrometer and related physics
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35
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Tidskriftsartikel (refereegranskat)abstract
- ALICE is the LHC experiment dedicated to the study of heavy-ion collisions at extreme energy density where formation of the quark–gluon plasma is expected. Among the different observables, open heavy flavors and heavy quarkonia states are especially relevant. Indeed they will be copiously produced and they will provide sensitive information on the collision. In this paper, the ALICE muon spectrometer will be described as well as the installation status. A few selected topics concerning the muon physics will be addressed and the related expected performances of the ALICE muon spectrometer will be given.
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| 7. |
- Franz, A., et al.
(författare)
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Highlights from PHENIX I
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35
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Tidskriftsartikel (refereegranskat)abstract
- This contribution highlights recent results from the PHENIX Collaboration at RHIC. It covers global variables, flow and 2-particle correlations. A second contribution in this issue, by T C Awes (2008 J. Phys. G: Nucl. Part. Phys. 35 104007), covers PHENIX results on heavy quarks, leptons and photons.
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| 8. |
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| 9. |
- Hamamoto-Kuroda, Ikuko, et al.
(författare)
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Weakly bound neutrons and quadrupole response function in the many-body pair correlation of neutron drip line nuclei
- 2006
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 32:8, s. 1105-1119
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Tidskriftsartikel (refereegranskat)abstract
- A simplified model of the Hartree-Fock Bogoliubov (HFB) equation with surface-type or volume-type pairing is solved in coordinate space with the correct asymptotic boundary conditions. By using the resulting HFB wavefunctions, the low-energy quadrupole (L = 2) response function is studied for the system with weakly bound s and d neutrons. As the binding energy of the neutrons becomes small or approaches zero, the discrete solutions of the HFB equation disappear. Then, without any further correlation ( for example, random phase approximation ( RPA) correlation), the threshold quadrupole response becomes broader and moves toward very low excitation energies, while the total strength increases very rapidly. The important role of the continuum character of the upper component u(lj) (r) of the HFB s(1/2) wavefunction in the increasing strength is pointed out. The large and broad quadrupole response with a very low peak energy is expected for neutron drip line nuclei with N approximate to 56 and Z approximate to 28, of which both the neutron 2d(5/2) and 3s(1/2) orbits may be weakly bound in the Hartree-Fock (HF) potential.
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| 10. |
- Homma, K., et al.
(författare)
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Systematic studies of global observables in PHENIX
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35
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Tidskriftsartikel (refereegranskat)abstract
- Systematic studies of global observables in different collision systems are indispensable for mapping the QCD phase diagram. Fluctuations in these quantities can provide fundamental information relevant for the phase transitions. The following global observables relevant to critical behavior are studied: the longitudinal density correlation, K to π and p to π fluctuations, and the constituent quark number scaling for elliptic flows.
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