共查询到20条相似文献,搜索用时 31 毫秒
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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
3.
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
4.
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
5.
Yu.A. Sitenko K.Yu. Rulik 《The European Physical Journal C - Particles and Fields》2003,28(3):405-414
We consider quantum electrodynamics with additional coupling of spinor fields to the space-time independent axial vector
violating both Lorentz and CPT-symmetries. The Fock-Schwinger proper-time method is used to calculate the one-loop effective action up to the second order
in the axial vector and to all orders in the space-time independent electromagnetic field strength. We find that the Chern-Simons
term is not radiatively induced and that the effective action is CPT-invariant in the given approximation.
Received: 29 January 2003 / Published online: 24 March 2003
RID="a"
ID="a" e-mail: sitenko@itp.unibe.ch
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ID="b" e-mail: rulik@to.infn.it 相似文献
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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
9.
We revisit the decoupling phenomenon of massless modes in non-commutative open string (NCOS) theories. We check the decoupling
by explicit computation in (2+1) or higher dimensional NCOS theories and recapitulate the validity of the decoupling to all
orders in perturbation theory.
Received: 23 April 2002 / Published online: 25 October 2002
RID="a"
ID="a" e-mail: hyun@phya.yonsei.ac.kr
RID="b"
ID="b" e-mail: sangmin@newton.skku.ac.kr
RID="c"
ID="c" e-mail: hshin@kias.re.kr 相似文献
10.
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
11.
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
12.
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
13.
N. Singhal V. Prasad M. Mohan 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,21(3):293-298
The molecular dynamics of polar diatomic molecule, interacting with linearly and circularly polarised laser field is studied.
Non-perturbative quasi-energy technique is used to determine the rotational field surfaces. Degeneracy in different M-levels
is found to be removed in the presence of circularly polarised electromagnetic radiation. In this paper, we present the calculations
exhibiting the dynamics of rotational excitation of a linear molecule and characteristic features of spectra which become
observable in considered fields.
Received 22 March 2002 / Received in final form 15 July 2002 Published online 6 November 2002
RID="a"
ID="a"e-mail: nsinghal@physics.du.ac.in
RID="b"
ID="b"e-mail: vnautiyal@himalaya.du.ac.in
RID="c"
ID="c"e-mail: manmohan@physics.du.ac.in 相似文献
14.
We use the transverse-momentum dependence of the cross section for the diffractive dissociation of high energy pions to two
jets to study some non-perturbative light-cone wave functions of the pion. We compare the predictions for this distribution
by Gaussian and Coulomb wave functions as well as the wave function derived from a solution of the light-cone Hamiltonian
in the singlet model. We conclude that this experimentally measured information provides a powerful tool for these studies.
Received: 15 January 2003 / Published online: 14 April 2003
RID="a"
ID="a" e-mail: ashery@tauphy.tau.ac.il
RID="b"
ID="b" e-mail: pauli@mpi-hd.mpg.de 相似文献
15.
Courty S Dollet B Kassner K Renault A Graner F 《The European physical journal. E, Soft matter》2003,11(1):53-59
We investigate the mechanical properties of a two-dimensional amorphous solid. It is formed spontaneously by the adsorption
of a protein (the β-lactoglobulin) at the surface of water. We measure its mechanical response in both elastic and plastic
regimes by applying a point-like force (using a glass fiber). We compare our results with previous measurements of shear moduli
using a floating torsion device.
Received: 10 February 2003 / Accepted: 23 April 2003 / Published online: 27 May 2003
RID="a"
ID="a"Present address: Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, UK; e-mail: sc374@phy.cam.ac.uk
RID="b"
ID="b"e-mail: graner@ujf-grenoble.fr 相似文献
16.
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
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ID="b"e-mail: protasov@isn.in2p3.fr
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ID="c"e-mail: avoronin@aha.ru
Communicated by A. Molinari 相似文献
17.
We calculate the , (P is the light pseudoscalar meson, V the light vector meson) form factors in the large-recoil limit in the perturbative QCD approach, including both the vector
(axial vector) and tensor operators. In general there are two leading components and for the B meson wave functions. We consider both contributions of them. Sudakov effects ( and threshold resummation) are included to regulate the soft end-point singularity. By choosing the hard scale as the maximum
virtualities of the internal particles in the hard b quark decay amplitudes, Sudakov factors can effectively suppress the long-distance soft contribution. The hard contribution
can be dominant in these approaches.
Received: 27 December 2002 / Published online: 5 May 2003
RID="a"
ID="a" e-mail: lucd@mail.ihep.ac.cn
RID="b"
ID="b" e-mail: yangmz@mail.ihep.ac.cn 相似文献
18.
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
19.
D. Klabucar K. Kumericki D. Mekterovic B. Podobnik 《The European Physical Journal C - Particles and Fields》2003,29(1):71-78
If instantons are introduced into the MIT bag model in such a way that the bag radii are allowed to vary, the MIT bag interior
can accommodate an instanton density which is by an order of magnitude larger than in the case when the radii are fixed (although
it is still significantly smaller than in the non-perturbative QCD vacuum). The instanton contribution to the baryon mass
shifts is also correspondingly larger. The instanton-induced part of the scalar strangeness of the nucleon MIT bag is an order
of magnitude larger than found previously, within the linearized approximation. The decrease of the model radii (which is
associated with the increase of the instanton density) is very favorable from the standpoint of nuclear physics.
Received: 7 February 2003 / Revised version: 1 April 2003 / Published online: 23 May 2003
RID="a"
ID="a" e-mail: klabucar@phy.hr
RID="b"
ID="b" e-mail: kkumer@phy.hr
RID="c"
ID="c" e-mail: dmekter@rudjer.irb.hr
RID="d"
ID="d" e-mail: bp@phy.hr. Present address: Faculty of Civil Engineering, University of Rijeka, HR-51000 Rijeka, Croatia 相似文献
20.
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