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排序方式: 共有80条查询结果,搜索用时 15 毫秒
11.
12.
M. A. Braun 《Theoretical and Mathematical Physics》2006,148(1):923-927
We show that subdominant terms obtained using the reggeized gluon diagram technique, which should be added to Pomeron fan
diagrams with the triple-Pomeron interaction, can be taken into account exactly if the initial condition for the evolution
is chosen in the Glauber form. This demonstrates the complete equivalence of the dipole picture and the reggeized gluon technique
in the high-energy limit not only in the leading order but also in the next order.
__________
Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 148, No. 1, pp. 57–63, July, 2006. 相似文献
13.
We consider a chiral one-loop hedgehog soliton of the bosonized SU(2)f Nambu & Jona-Lasinio model which is embedded in a hot medium of constituent quarks. Energy and radius of the soliton are
determined in self-consistent mean-field approximation. Quasi-classical corrections to the soliton energy are derived by means
of the pushing and cranking approaches. The corresponding inertial parameters are evaluated. It is shown that the inertial
mass is equivalent to the total internal energy of the soliton. Corrected nucleon and δ isobar masses are calculated in dependence
on temperature and density of the medium. As a result of the self-consistently determined internal structure of the soliton
the scaling between constituent quark mass, soliton mass and radius is noticeably disturbed.
Received: 26 September 1997 相似文献
14.
J. Hüfner Y.B. He B.Z. Kopeliovich 《The European Physical Journal A - Hadrons and Nuclei》2000,7(2):239-244
Prompt gluons are an additional source for charmonium suppression in nuclear collisions, in particular for nucleus-nucleus
collisions. These gluons are radiated as bremsstrahlung in N-N collisions and interact inelastically with the charmonium states
while the nuclei still overlap. The spectra and mean number <n
g> of the prompt gluons are calculated perturbatively and the inelastic cross section σabs
Ψg is estimated. The integrated cross sections σ(A B →J/ψX) for p-A and A-B collisions and the dependence on transverse energy for S-U and Pb-Pb can be described quantitatively with
some adjustment of one parameter <n
g>σabs
Ψg.
Received: 20 August 1999 相似文献
15.
16.
Bikash Sinha 《Pramana》1989,32(4):523-539
The general characteristics of the transition from hadronic matter of nucleons, three quark bags, mesons of quark antiquark
pairs to quark gluon plasma is discussed. The phenomenological approach essentially guided by the MIT bag model and general
thermodynamic criteria of first-order phase transition is elaborated. The more realistic calculations using the QCD lattice
renormalization quark are touched upon. Possible signals of quark-gluon plasma are discussed. The central issue of deciphering
plasma signals from the signals of hot hadronic matter is discussed in detail.
The signals of the quark-gluon plasma, a subject of considerable interest in contemporary literature are focussed only on
(i) dileptons (ii) photon photon pairs and (iii)J/Ψ suppression (with special emphasis on CERN experiments). The lingering shadow of “EMC” effect is also mentioned.
Relics of the very early universe microseconds after the big bang in today’s universe (∼ 15 billion years later) are discussed.
Finally, the outlook of this very exciting field is presented, a purely personal viewpoint, generalized eventually to poetic
signals of the creation of the universe. 相似文献
17.
建立了夸克胶子等离子体中胶子的经典输运方程, 并讨论了它与胶子的量子输运方程以及它与夸克的经典输运方程之间的关系. 相似文献
18.
M. V. Kossov 《The European Physical Journal A - Hadrons and Nuclei》2007,34(3):283-291
The Geant4 quark level CHIPS (CHiral Invariant Phase Space) model simulates nuclear reactions assuming asymptotic freedom
of massless quarks uniformly distributed over invariant phase space. Electro-nuclear reactions are simulated generating low-Q2 equivalent photons. In this paper generalisation of the model for high Q2 is made to describe neutrino-nuclear reactions, where the low-Q2 contribution is suppressed by the W -boson mass. The proposed non-perturbative approximation of structure functions fits high-energy lepto-nucleon reactions
with high-Q2 and neutrino-nucleon reactions starting from the threshold. 相似文献
19.
P.V. Degtyarenko M.V. Kossov H.-P. Wellisch 《The European Physical Journal A - Hadrons and Nuclei》2000,9(3):411-420
An event generator based on the CHIPS model is implemented in the GEANT4 simulation toolkit. Nuclear fragment production in
the process of pion capture on nuclei is used to tune the parameters of the CHIPS model describing clusterization of nucleons
in nuclei. The spectra of nucleons and nuclear fragments in pion capture and in photonuclear reactions at 60 MeV are compared
with experimental data.
Received: 30 May 2000 / Accepted: 2 November 2000 相似文献
20.
J. Hüfner Yu.P. Ivanov B.Z. Kopeliovich J. Raufeisen 《The European Physical Journal A - Hadrons and Nuclei》2000,7(3):391-396
The mass spectrum is calculated for those dileptons which are produced in the early phase of a heavy ion collisions via the
direct production NN → l+l−X and via the Compton process GN → l+l−X with prompt gluons radiated in preceding NN interactions. Both mechanisms produce a mass spectrum which decreases steeply
with invariant mass of the l+l− pair and which is below the CERES data for Pb-Au collisions by about one order of magnitude.
Received: 1 December 1999 / Revised version: 18 February 2000 相似文献