共查询到20条相似文献,搜索用时 46 毫秒
1.
S. Kagiyama S. Kumamoto A. Minaka A. Nakamura K. Ohkura S. Yamaguchi 《The European Physical Journal C - Particles and Fields》2002,25(3):453-458
The phase structure of hadrons and the quark-gluon plasma is investigated by two types of equation of state of the hadrons,
namely the ideal hadron gas model and the compressible bag model. It is pointed out that, while the ideal gas model produces
an unrealistic extra hadron phase, the compressible bag model gives the expected and reasonable phase diagram even if the
rich hadron spectrum is taken into account.
Received: 22 February 2002 / Revised version: 28 June 2002 / Published online: 20 September 2002
RID="a"
ID="a" e-mail: kagiyama@sci.kagoshima-u.ac.jp
RID="b"
ID="b" e-mail: kumamoto@cosmos01.cla.kagoshima-u.ac.jp
RID="c"
ID="c" e-mail: minaka@edu.kagoshima-u.ac.jp
RID="d"
ID="d" e-mail: nakamura@sci.kagoshima-u.ac.jp
RID="e"
ID="e" e-mail: ohkura@cosmos01.cla.kagoshima-u.ac.jp
RID="f"
ID="f" e-mail: yamaguchi@cosmos01.cla.kagoshima-u.ac.jp 相似文献
2.
C. Dams R. Kleiss P. Draggiotis E.N. Argyres A. van Hameren C.G. Papadopoulos 《The European Physical Journal C - Particles and Fields》2003,28(4):561-571
We introduce a class of self-interacting scalar theories in which the various coupling constants obey a recursive relation.
These imply a particularly simple form for the generating function of the Feynman amplitudes with vanishing external momenta,
as well as for the effective potential. In addition we discuss an interesting duality inherent in these models. Specializing
to the case of zero spacetime dimensions we find intriguing nullification properties for the amplitudes.
Received: 19 December 2001 / Published online: 5 May 2003
RID="a"
ID="a" e-mail: chrisd@sci.kun.nl
RID="b"
ID="b" e-mail: kleiss@sci.kun.nl
RID="c"
ID="c" e-mail: petros@sci.kun.nl
RID="d"
ID="d" e-mail: andrevh@sci.kun.nl
RID="e"
ID="e" e-mail: papadopo@alice.nuclear.demokritos.gr 相似文献
3.
F. Deppisch H. Päs A. Redelbach R. Rückl Y. Shimizu 《The European Physical Journal C - Particles and Fields》2003,28(3):365-374
We discuss the perspectives of testing the right-handed Majorana mass scale MR of the SUSY see-saw model in the mSUGRA framework. Lepton-flavor violating low energy processes are analyzed in recently
proposed post-LEP benchmark scenarios, taking into account present uncertainties and future developments in the neutrino sector.
Non-observation of in the next-generation PSI experiment will provide upper bounds on MR of the order of GeV, while on the other hand, a positive signal for at SUPERKEKB or the LHC may determine MR for a given mSUGRA scenario with an accuracy of a factor of 2.
Received: 14 June 2002 / Revised version: 7 January 2003 / Published online: 14 April 2003
RID="a"
ID="a" e-mail: deppisch@physik.uni-wuerzburg.de
RID="b"
ID="b" e-mail: paes@physik.uni-wuerzburg.de
RID="c"
ID="c" e-mail: asredelb@physik.uni-wuerzburg.de
RID="d"
ID="d" e-mail: rueckl@physik.uni-wuerzburg.de
RID="e"
ID="e" e-mail: shimizu@eken.phys.nagoya-u.ac.jp 相似文献
4.
G. Degrassi S. Heinemeyer W. Hollik P. Slavich G. Weiglein 《The European Physical Journal C - Particles and Fields》2003,28(1):133-143
The status of the evaluation of the MSSM Higgs sector is reviewed. The phenomenological impact of recently obtained corrections
is discussed. In particular it is shown that the upper bound on mh within the MSSM is shifted upwards. Consequently, lower limits on obtained by confronting the upper bound as function of with the lower bound on mh from Higgs searches are significantly weakened. Furthermore, th
e region in the MA--plane where the coupling of the lightest Higgs boson to down-type fermions is suppressed is modified. The presently not calculated
higher-order corrections to the Higgs-boson mass matrix are estimated to shift the mass of the lightest Higgs boson by up
to 3 GeV.
Received: 12 December 2002 / Published online: 3 March 2003
RID="a"
ID="a" e-mail: giuseppe.degrassi@roma3.infn.it
RID="b"
ID="b" e-mail: Sven.Heinemeyer@physik.uni-muenchen.de
RID="c"
ID="c" e-mail: hollik@mppmu.mpg.de
RID="d"
ID="d" e-mail: slavich@mppmu.mpg.de
RID="e"
ID="e" e-mail: Georg.Weiglein@durham.ac.uk 相似文献
5.
R. Fiore A. Flachi L.L. Jenkovszky A.I. Lengyel V.K. Magas 《The European Physical Journal A - Hadrons and Nuclei》2002,15(4):505-515
An explicit model realizing parton-hadron duality and fitting the data is suggested. Complex nonlinear Regge trajectories
are important ingredients of the model. The inclusion of Δ and N* trajectories should account for all resonances in the direct channel. The exotic trajectory is responsible for the smooth
background.
Received: 7 June 2002 / Accepted: 3 July 2002 / Published online: 10 December 2002
RID="a"
ID="a"e-mail: fiore@cs.infn.it
RID="b"
ID="b"e-mail: flachi@ifae.es
RID="c"
ID="c"e-mail: jenk@gluk.org
RID="d"
ID="d"e-mail: sasha@len.uzhgorod.ua
RID="e"
ID="e"e-mail: vladimir@cfif.ist.utl.pt
Communicated by V.V. Anisovich 相似文献
6.
N. Kan K. Sakamoto K. Shiraishi 《The European Physical Journal C - Particles and Fields》2003,28(3):425-430
We calculate the effective potential for the WLPNGB in a world with a circular latticized extra dimension. The mass of the
Wilson line pseudo-Nambu-Goldstone boson (WLPNGB) is calculated from the one-loop quantum effect of scalar fields at zero
and finite temperature. We show that a series expansion by the modified Bessel functions is useful to calculate the one-loop
effective potentials.
Received: 24 January 2003 / Published online: 14 April 2003
RID="a"
ID="a" e-mail: b1834@sty.cc.yamaguchi-u.ac.jp
RID="b"
ID="b" e-mail: b1795@sty.cc.yamaguchi-u.ac.jp
RID="c"
ID="c" e-mail: shiraish@po.cc.yamaguchi-u.ac.jp 相似文献
7.
J. Bordes Chan Hong-Mo Tsou Sheung Tsun 《The European Physical Journal C - Particles and Fields》2003,27(2):189-200
It is shown that existing data on the mixing between up and down fermion states and on the hierarchical mass ratios between
fermion generations, as far as can be so analyzed at present, are all consistent with the two phenomena being both consequences
of a mass matrix rotating in generation space with changing energy scale. As a result, the rotating mass matrix can be traced
over some 14 orders of magnitude in energy from the mass scale of the t quark at 175 GeV to below that of the atmospheric neutrino at 0.05 eV.
Received: 27 August 2002 / Published online: 24 January 2003
RID="a"
ID="a" e-mail: jose.m.bordes@uv.es
RID="b"
ID="b" e-mail: h.m.chan@rl.ac.uk
RID="c"
ID="c" e-mail: tsou@maths.ox.ac.uk 相似文献
8.
R.P. Duperray K.V. Protasov A.Yu. Voronin 《The European Physical Journal A - Hadrons and Nuclei》2003,16(1):27-34
The experimental data of the antideuteron production in proton-proton and proton-nucleus collisions are analyzed within a
simple model based on the diagrammatic approach to the coalescence model. This model is shown to be able to reproduce most
of the existing data without any additional parameter.
Received: 18 April 2002 / Accepted: 30 August 2002 / Published online: 17 January 2003
RID="a"
ID="a"e-mail: duperray@isn.in2p3.fr
RID="b"
ID="b"e-mail: protasov@isn.in2p3.fr
RID="c"
ID="c"e-mail: avoronin@aha.ru
Communicated by A. Molinari 相似文献
9.
K. Ikematsu K. Fujii Z. Hioki Y. Sumino T. Takahashi 《The European Physical Journal C - Particles and Fields》2003,29(1):1-10
We developed a new method for the full kinematical reconstruction of the system near its threshold at future linear e
+
e
-
colliders. In the core of the method lies likelihood fitting which is designed to improve measurement accuracies of the kinematical
variables that specify the final states resulting from decays. The improvement is demonstrated by applying this method to a Monte Carlo sample generated with various experimental effects including beamstrahlung, finite acceptance and resolution of the detector
system, etc. In most cases the fit takes a broad non-Gaussian distribution of a given kinematical variable to a nearly Gaussian
shape, thereby justifying phenomenological analyses based on simple Gaussian smearing of the parton-level momenta. The standard
deviations of the resultant distributions of various kinematical variables are given in order to facilitate such phenomenological
analyses. A possible application of the kinematical fitting method and its expected impact are also discussed.
Received: 4 March 2003 / Published online: 23 May 2003
RID="a"
ID="a" e-mail: ikematsu@post.kek.jp
RID="b"
ID="b" e-mail: fujiik@jlcuxf.kek.jp
RID="c"
ID="c" e-mail: hioki@ias.tokushima-u.ac.jp
RID="d"
ID="d" e-mail: sumino@tuhep.phys.tohoku.ac.jp
RID="e"
ID="e" e-mail: tohrut@hiroshima-u.ac.jp 相似文献
10.
11.
We investigate the scope of all relevant production modes of charged Higgs bosons in the MSSM, with mass larger than the
one of the top quark, at future Linear Colliders operating in mode at the TeV energy scale. Final states with one or two bosons are considered, as produced by both tree- and loop-level interactions.
Received: 8 November 2002 / Revised version: 12 February 2003 / Published online: 13 May 2003
RID="a"
ID="a" e-mail: stefano.moretti@cern.ch
RID="b"
ID="b" e-mail: kanemu@post.kek.jp 相似文献
12.
T.M. Aliev A. Özpineci M. Savci 《The European Physical Journal C - Particles and Fields》2003,29(2):265-270
We study the effects of sequential fourth quark generation in rare decays induced by the transition and in B
s
0- mixing. Using the experimental values on the branching ratios of the and decays, the allowed regions for and are determined as a function of the t
'
quark mass.
Received: 3 April 2003 / Published online: 2 June 2003
RID="a"
ID="a" e-mail: taliev@metu.edu.tr
RID="b"
ID="b" e-mail: ozpineci@ictp.trieste.it
RID="c"
ID="c" e-mail: savci@metu.edu.tr 相似文献
13.
H. Czyz A. Grzelinska J.H. Kühn G. Rodrigo 《The European Physical Journal C - Particles and Fields》2003,27(4):563-575
The radiative return offers the unique possibility for a measurement of the cross section of electron-positron annihilation
into hadrons over a wide range of energies. The large luminosity of present - and B-factories easily compensates for the additional factor of due to the emission of a hard photon. Final states with photons at large angles can be easily identified. The rate for events
with collinear photons, however, is enhanced by a large logarithm and allows, in particular at lower energies, for a complementary
measurement. The Monte Carlo generator PHOKHARA, which includes next-to-leading order corrections from virtual and real photon
emission, has been extended from large photon angles into the collinear region, using recent results for the virtual corrections.
In addition, the present version includes final state radiation for muon and pion pair production and final states with four
pions. Implications for the experimental analysis at three typical energies, 1.02, 4 and 10.6 GeV, are presented: the magnitude
of these new corrections is studied, possibilities for the separation of initial and final state radiation are proposed, and
the differences with respect to the previous treatment based on structure functions are investigated.
Received: 16 December 2002 / Published online: 26 February 2003
RID="a"
ID="a" e-mail: czyz@us.edu.pl
RID="b"
ID="b" e-mail: grzel@joy.phys.us.edu.pl, Supported in part by "Marie Curie Training Site" at Karlsruhe University
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ID="c" e-mail: jk@particle.uni-karlsruhe.de
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ID="d" e-mail: german.rodrigo@cern.ch, Supported in part by E.U. TMR grant HPMF-CT-2000-00989 相似文献
14.
We address the problem that the cross section for the collisions of unstable particles diverges, if calculated by standard
methods. This problem is considered for beams much smaller than the decay length of the unstable particle, much larger than
the decay length and finally also for pancake- shaped beams. We find that in all cases this problem can be solved by taking
into account the production/propagation of the unstable particle and/or the width of the incoming wave packets in momentum
space.
Received: 4 March 2003 / Revised version: 8 April 2003 / Published online: 23 May 2003
RID="a"
ID="a" e-mail: chrisd@sci.kun.nl
RID="b"
ID="b" e-mail: kleiss@sci.kun.nl 相似文献
15.
16.
I. Lubashevsky P. Wagner R. Mahnke 《The European Physical Journal B - Condensed Matter and Complex Systems》2003,32(2):243-247
This paper introduces a car following model where the driving scheme takes into account the deficiencies of human decision
making in a general way. Additionally, it improves certain shortcomings of most of the models currently in use: it is stochastic
but has a continuous acceleration. This is achieved at the cost of formulating the model in terms of the time derivative of
the acceleration, making it non-Newtonian. However, the recipe for construction of bounded rational driver models proposed
in this paper seems to be very general and can be applied to most, if not all of the traditional car-following models.
Received 18 November 2002 / Received in final form 6 February 2003 Published online 1st April 2003
RID="a"
ID="a"e-mail: ialub@fpl.gpi.ru
RID="b"
ID="b"e-mail: peter.wagner@dlr.de
RID="c"
ID="c"e-mail: reinhard.mahnke@physik.uni-rostock.de 相似文献
17.
G.H. Arakelyan A. Capella A.B. Kaidalov Yu.M. Shabelski 《The European Physical Journal C - Particles and Fields》2002,26(1):81-90
The process of baryon number transfer due to string junction propagation in rapidity space is analyzed. It has a significant
effect on the net baryon production in pp collisions at mid-rapidities and an even larger effect in the forward hemisphere in the cases of and interactions. The results of numerical calculations in the framework of the quark-gluon string model are in reasonable agreement
with the data.
Received: 14 December 2001 / Revised version: 24 April 2002 Published online: 16 October 2002
RID="a"
ID="a" Permanent address: Yerewan Physics Institute, Armenia and JINR, Dubna, Russia e-mail: argev@jerewan1.yerphi.am
RID="b"
ID="b" e-mail: Alphonse.Capella@th.u-psud.fr
RID="c"
RID="d" 相似文献
18.
V.A. Petrov E. Predazzi A. Prokudin 《The European Physical Journal C - Particles and Fields》2003,28(4):525-533
An analysis of the Coulombic amplitude and its interference with the nuclear amplitude which is driven by the three-component
pomeron is presented. It is shown that different approaches towards the evaluation of the Coulomb phase give approximately
uniform results at all energies and the differences are negligible at RHIC and LHC energies. We show that the use of the amplitude
which was fitted to accommodate the nucleon data only (in the region (GeV2)), combined with the Coulomb amplitude, reproduces the existing data in the Coulomb interference domain quite accurately
without any adjustment of the parameters. As a consequence, we predict the differential cross section in the region of the
Coulomb nucleon interference for both RHIC and LHC energies.
Received: 3 June 2002 / Revised version: 27 February 2003 / Published online: 5 May 2003
RID="a"
ID="a" e-mail: petrov@mx.ihep.su
RID="b"
ID="b" e-mail: predazzi@to.infn.it
RID="c"
ID="c" e-mail: prokudin@to.infn.it 相似文献
19.
We study the lateral and transverse diffusion of amphiphiles in two-component bilayer membranes, using a coarse-grained model
for amphiphilic molecules and combined Monte Carlo-Molecular Dynamics simulations. Membrane structural properties, such as
the mean thickness, are also measured. The dependence of such properties on membrane composition, inter-molecular interactions,
and amphiphile stiffness is determined. In particular, we show that addition of shorter amphiphiles drives the model membrane
towards a more fluid state, with increased amphiphile lateral diffusion rates. These results can be understood in the framework
of a simple free-volume model. Furthermore, we observe an increase in the trans-membrane diffusion when the interaction energy
of amphiphiles with their neighboring molecules is decreased.
Received: 6 December 2002 / Accepted: 17 April 2003 / Published online: 27 May 2003
RID="a"
ID="a"e-mail: imparato@mpikg-golm.mpg.de
RID="b"
ID="b"e-mail: shillcock@mpikg-golm.mpg.de
RID="c"
ID="c"e-mail: lipowsky@mpikg-golm.mpg.de 相似文献
20.
Karanikas A.I. Ktorides C.N. Stefanis N.G. 《The European Physical Journal C - Particles and Fields》2003,26(3):445-455
We employ the Polyakov world-line path-integral version of QCD to identify and resum at leading perturbative order enhanced
radiative gluon contributions to the Drell-Yan type ( pair annihilation) cross-sections. We emphasize that this is the first time that world-line techniques are applied to cross-section
calculations.
Received: 10 June 2002 / Published online: 31 October 2002
RID="a"
ID="a" e-mail: akaranik@cc.uoa.gr
RID="b"
ID="b" e-mail: cktorid@cc.uoa.gr
RID="c"
ID="c" e-mail: stefanis@tp2.ruhr-uni-bochum.de 相似文献