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91.
Based on general arguments, the in-medium quark propagator in a quark-gluon plasma leads to a quark dispersion relation consisting
of two branches, of which one exhibits a minimum at some finite momentum. This results in a vanishing group velocity for collective
quark modes. Important quantities such as the production rate of low mass lepton pairs and mesonic correlators depend inversely
on this group velocity. Therefore these quantities, which follow from self energy diagrams containing a quark loop, are strongly
affected by van Hove singularities (peaks and gaps). If these sharp structures could be observed in relativistic heavy-ion
collisions it would reveal the physical picture of the quark-gluon plasma (QGP) as a gas of quasiparticles. 相似文献
92.
93.
E. Klempt A. V. Anisovich V. A. Nikonov A. V. Sarantsev U. Thoma 《The European Physical Journal A - Hadrons and Nuclei》2006,29(3):307-313
A novel technique to probe the resonant structure of a partial-wave amplitude is proposed and applied to data on photoproduction
of baryon resonances. 相似文献
94.
Dimitris Gatzouras Giannopoulos Apostolos Nikolaos Markoulakis 《Discrete and Computational Geometry》2005,34(2):331-349
Let $f_{n-1}(P)$ denote the number of facets of a
polytope $P$ in ${\Bbb R}^n$. We show that there exist 0/1
polytopes $P$ with $$f_{n-1}(P)\geq\left (\frac{cn}{\log^2
n}\right )^{n/2},$$ where $c>0$ is an absolute constant. This
improves earlier work of Barany and Por on a question
of Fukuda and Ziegler. 相似文献
95.
A. V. Anisovich V. Kleber E. Klempt V. A. Nikonov A. V. Sarantsev U. Thoma 《The European Physical Journal A - Hadrons and Nuclei》2007,34(3):243-254
A partial-wave analysis of data on photoproduction of hyperons including single and double polarization observables is presented.
The large spin transfer probability reported by the CLAS Collaboration can be successfully described within an isobar partial-wave
analysis. 相似文献
96.
Kostas Kleidis Apostolos Kuiroukidis Demetrios Papadopoulos Loukas Vlahos 《International Journal of Theoretical Physics》2007,46(9):2283-2298
We study the linear magnetohydrodynamic (MHD) equations, both in the Newtonian and the general-relativistic limit, as regards
a viscous magnetized fluid of finite conductivity and discuss instability criteria. In addition, we explore the excitation
of cosmological perturbations in anisotropic spacetimes, in the presence of an ambient magnetic field. Acoustic, electromagnetic
(e/m) and fast-magnetosonic modes, propagating normal to the magnetic field, can be excited, resulting in several implications
of cosmological significance. 相似文献
97.
Thoma SG Sanchez A Provencio PP Abrams BL Wilcoxon JP 《Journal of the American Chemical Society》2005,127(20):7611-7614
Blue-emitting, cubic phase CdSe nanorods with an approximate diameter of 2.5 nm and lengths up to 12 nm have been synthesized at low temperature (100 degrees C) in a single surfactant using a single-source molecular precursor. Transmission electron microscopy and dynamic light scattering measurements indicate that the nanorods are formed from self-assembly of isotropic nanoclusters. Anisotropic growth in a single surfactant appears to be favored when growth occurs below the thermal decomposition temperature of the single-source precursor. 相似文献
98.
A.?V.?Anisovich E.?KlemptEmail author A.?V.?Sarantsev U.?Thoma 《The European Physical Journal A - Hadrons and Nuclei》2005,24(1):111-128
Partial-wave amplitudes for production and decay of baryon resonances are constructed in the framework of the operator expansion method. The approach is fully relativistically invariant and allows us to perform combined analyses of different reactions imposing directly analyticity and unitarity constraints. All formulas are given explicitly in the form used by the Crystal Barrel Collaboration in the (partly forthcoming) analyses of the electro-, photo- and pion-induced meson production data. 相似文献
99.
A.?V.?Anisovich A.?Sarantsev O.?Bartholomy E.?KlemptEmail author V.?A.?Nikonov U.?Thoma 《The European Physical Journal A - Hadrons and Nuclei》2005,25(3):427-439
A combined analysis of photoproduction data on γp↦ πN, ηN was performed including the data on KΛ and KΣ. The data are interpreted in an isobar model with s-channel baryon resonances and π, ρ (ω), K, and K
* exchange in the t-channel. Three baryon resonances have a substantial coupling to ηN, the well-known N(1535)S
11, N(1720)P
13, and N(2070)D
15. The inclusion of data with open strangeness reveals evidence for further new resonances, N(1840)P
11, N(1875)D
13 and, with weaker evidence, for N(2170)D
13. 相似文献
100.
Under very general assumptions we show that the quark dispersion relation in the quark-gluon plasma is given by two collective branches, of which one has a minimum at a nonvanishing momentum. This general feature of the quark dispersion relation leads to structures (van Hove singularities, gaps) in the low mass dilepton production rate, which might provide a unique signature for the quark-gluon plasma formation in relativistic heavy ion collisions. 相似文献