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991.
A.?WereszczyńskiEmail author M.??lusarczyk 《The European Physical Journal C - Particles and Fields》2005,39(2):185-193
Lattice motivated triplet color scalar field theory is analyzed. We consider non-minimal as well as covariant derivative coupling with SU(2) gauge fields. Field configurations generated by external electric sources are presented. Moreover non-Abelian magnetic monopoles are found. Dependence on the spatial coordinates in the obtained solutions is identical as in the usual Abelian case. We show also that after a decomposition of the fields a modified Faddeev-Niemi action can be obtained. It contains explicit O(3) symmetry breaking term parameterized by the condensate of an isoscalar field. Due to that Goldstone bosons observed in the original Faddeev-Niemi model are removed.Received: 23 January 2004, Revised: 29 July 2004, Published online: 11 January 2005 相似文献
992.
I.?P.?LokhtinEmail author A.?K.?Managadze L.?I.?Sarycheva A.?M.?Snigirev 《The European Physical Journal C - Particles and Fields》2005,44(1):51-57
The hypothesis of the relation between the observed alignment of spots in x-ray films in cosmic ray emulsion experiments and the features of events in which jets prevail at super-high energies is tested. Due to the strong dynamical correlation between jet axis directions and that between the momenta of jet particles (almost collinearity), the evaluated degree of alignment is considerably larger than that for randomly selected chaotically located spots in the x-ray film. It appears to be comparable with the experimental data provided that the height of the primary interaction, the collision energy and the total energy of the selected clusters meet certain conditions. The Monte Carlo generator PYTHIA, which basically well describes jet events in hadron-hadron interactions, was used for the analysis.Received: 25 February 2005, Revised: 18 April 2005, Published online: 2 August 2005 相似文献
993.
T.?Sj?strandEmail author P.?Z.?Skands 《The European Physical Journal C - Particles and Fields》2005,39(2):129-154
We propose a sophisticated framework for high-energy hadronic collisions, wherein different QCD physics processes are interleaved in a common sequence of falling transverse-momentum values. Thereby phase-space competition is introduced between multiple parton-parton interactions and initial-state radiation. As a first step we develop new transverse-momentum-ordered showers for initial- and final-state radiation, which should be of use also beyond the scope of the current article. These showers are then applied in the context of multiple interactions, and a few tests of the new model are presented. The article concludes with an outlook on further aspects, such as the possibility of a shower branching giving partons participating in two different interactions.Received: 26 August 2004, Revised: 14 October 2004, Published online: 11 January 2005 相似文献
994.
A.?V.?KisselevEmail author 《The European Physical Journal C - Particles and Fields》2005,42(2):217-225
We consider the scattering of brane fields due to t-channel massive graviton exchanges in the Randall-Sundrum model. The eikonal amplitude is analytically calculated and both differential and total neutrino-nucleon cross sections are estimated. The event rate of quasi-horizontal air showers induced by cosmic neutrinos, which can be detected at the Pierre Auger Observatory, is presented for two different fluxes of cosmogenic neutrinos.Received: 27 December 2004, Published online: 8 June 2005 相似文献
995.
D.?Bazeia F.?A.?BritoEmail author W.?Freire R.?F.?Ribeiro 《The European Physical Journal C - Particles and Fields》2005,40(4):531-537
We investigate confinement from new global defect structures in three spatial dimensions. The global defects arise in models described by a single real scalar field, governed by special scalar potentials. They appear as electrically, magnetically or dyonically charged structures. We show that they induce confinement, when they are solutions of effective QCD-like field theories in which the vacua are regarded as color dielectric media with an antiscreening property. As expected, in three spatial dimensions the monopole-like global defects generate the Coulomb potential as part of several confining potentials.Received: 25 August 2004, Published online: 16 March 2005PACS:
11.27. + d, 12.39.-x 相似文献
996.
P.?C.?BrunsEmail author U.-G.?Mei?ner 《The European Physical Journal C - Particles and Fields》2005,40(1):97-119
We extend the method of infrared regularization to spin-1 fields. As applications, we discuss the chiral extrapolation of the rho meson mass from lattice QCD data and the pion-rho sigma term.Received: 18 November 2004, Published online: 4 February 2005PACS:
12.39.Fe, 12.38.GcWork supported in part by Deutsche Forschungsgemeinschaft through grants provided for the SFB/TR 16 Subnuclear Structure of Matter. 相似文献
997.
G.?Kl?mkeEmail author K.?M?nig 《The European Physical Journal C - Particles and Fields》2005,42(3):261-270
A Monte-Carlo analysis on production and decay of supersymmetric charginos at a future photon-collider is presented. A photon collider offers the possibility of a direct branching-ratio measurement. In this study, the process
has been considered for a specific mSUGRA scenario. Various backgrounds and a parameterised detector simulation have been included. Depending on the centre-of-mass energy, a statistical error for the directly measurable branching ratio BR(
) of up to 3.5% can be reached.Received: 14 March 2005, Revised: 31 May 2005, Published online: 28 June 2005G. Klämke: Now at: Institut für Theoretische Physik, Universität Karlsruhe, Wolfgang-Gaede-Str. 1, 76131 Karlsruhe, Germany 相似文献
998.
We define a constituent quark within QCD. It is shown that the spin of such a quark and hence also the spin of the nucleon is a complex phenomenon. We discuss it in view of the experimental data.Received: 31 March 2005, Revised: 13 May 2005, Published online: 28 July 2005 相似文献
999.
Z.?Lehtihet L.?ChetouaniEmail author 《The European Physical Journal C - Particles and Fields》2005,42(2):243-251
An exact and analytic Green function for a spinless particle in interaction with an electromagnetic plane wave field, expressed in the coordinate gauge is given by Parisi-Wu stochastic quantization method. We separate the classical calculations from those related to the quantum fluctuation term. We have used a perturbative treatment relying on phase and configuration spaces formulation.Received: 27 January 2005, Revised: 3 April 2005, Published online: 8 June 2005PACS:
03.65.Ca, 03.65.Pm, 05.10.Gg 相似文献
1000.
L.?V.?MitsynaEmail author V.?G.?Nikolenko S.?S.?Parzhitski A.?B.?Popov G.?S.?Samosvat 《The European Physical Journal C - Particles and Fields》2005,40(4):473-477
A novel method to extract the neutron-electron scattering length b
ne
from the precise neutron scattering data measured for a noble gas at several different densities n is proposed. The main point of this method is dividing the experimental data into two parts: the first, nearly proportional to n, corresponding to diffraction on neighboring atoms and the second one, a small contribution of n, e scattering independent on n. The proposed technique is demonstrated using the structure factor S(q) for gaseous krypton.Received: 12 October 2004, Revised: 1 December 2004, Published online: 7 March 2005PACS:
28.20.-v, 61.12.-q, 14.20.Dh, 13.40.-f 相似文献