共查询到20条相似文献,搜索用时 29 毫秒
1.
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
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ID="c" e-mail: shiraish@po.cc.yamaguchi-u.ac.jp 相似文献
2.
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
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ID="a" e-mail: ikematsu@post.kek.jp
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ID="b" e-mail: fujiik@jlcuxf.kek.jp
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ID="c" e-mail: hioki@ias.tokushima-u.ac.jp
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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.
5.
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
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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
6.
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
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ID="b"e-mail: flachi@ifae.es
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ID="c"e-mail: jenk@gluk.org
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ID="d"e-mail: sasha@len.uzhgorod.ua
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ID="e"e-mail: vladimir@cfif.ist.utl.pt
Communicated by V.V. Anisovich 相似文献
7.
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
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ID="b" e-mail: sangmin@newton.skku.ac.kr
RID="c"
ID="c" e-mail: hshin@kias.re.kr 相似文献
8.
9.
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
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ID="b"e-mail: vnautiyal@himalaya.du.ac.in
RID="c"
ID="c"e-mail: manmohan@physics.du.ac.in 相似文献
10.
R.-D. Herzberg N. Amzal J.E. Bastin F. Becker P.M.T. Brew P.A. Butler A.J.C. Chewter J.F.C. Cocks O. Dorvaux K. Eskola J. Gerl P.T. Greenlees N.J. Hammond K. Hauschild K. Helariutta F. Heßberger M. Houry A. Hürstel R.D. Humphreys G.D. Jones P.M. Jones R. Julin S. Juutinen H. Kankaanpää H. Kettunen T.L. Khoo W. Korten P. Kuusiniemi Y. Le Coz M. Leino A.P. Leppänen C.J. Lister R. Lucas M. Muikku P. Nieminen R.D. Page T. Page P. Rahkila P. Reiter Ch. Schlegel C. Scholey G. Sletten O. Stezowski Ch. Theisen W.H. Trzaska J. Uusitalo H.J. Wollersheim 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):205-208
In-beam conversion electron spectroscopy experiments have been performed on the transfermium nuclei 253, 254No using the conversion electron spectrometer SACRED in nearly collinear geometry in conjunction with the gas-filled separator
RITU at the University of Jyv?skyl?. The experimental setup is discussed and the spectra are compared to Monte Carlo simulations.
The implications for the ground-state configuration of 253No are discussed.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
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ID="a"e-mail: rdh@ns.ph.liv.ac.uk
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ID="b"Present address: GANIL, F-14021 Caen, France.
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ID="c"Permanent address: IReS Strasbourg, IN2P3-CNRS, F-67037-Strasbourg, France.
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ID="d"Present address: CEA/DIF DCRE/SDE/LDN F-91680 Bruyeres-le-Chatel.
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ID="e"Present address: Daresbury Laboratory, Daresbury WA4 4AD, UK.
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ID="f"Permanent address: IPN Lyon, IN2P3-CNRS, F-69037 Lyon, France. 相似文献
11.
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
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ID="c" e-mail: hollik@mppmu.mpg.de
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ID="d" e-mail: slavich@mppmu.mpg.de
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ID="e" e-mail: Georg.Weiglein@durham.ac.uk 相似文献
12.
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
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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
13.
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
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ID="b" e-mail: kkumer@phy.hr
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ID="c" e-mail: dmekter@rudjer.irb.hr
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ID="d" e-mail: bp@phy.hr. Present address: Faculty of Civil Engineering, University of Rijeka, HR-51000 Rijeka, Croatia 相似文献
14.
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
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ID="a" e-mail: jose.m.bordes@uv.es
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ID="b" e-mail: h.m.chan@rl.ac.uk
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ID="c" e-mail: tsou@maths.ox.ac.uk 相似文献
15.
E. Martynov E. Predazzi A. Prokudin 《The European Physical Journal C - Particles and Fields》2002,26(2):271-284
A model based on a dipole pomeron framework for exclusive vector meson photoproduction by real and virtual photons shows
very good agreement with the experimental data. This model does not violate unitarity constraints and describes in a universal
manner all the available data for , , , and vector meson photoproduction in the region of energies and photon virtualities .
Received: 18 December 2001 / Published online: 25 October 2002
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ID="a" e-mail: martynov@bitp.kiev.ua
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ID="b" e-mail: predazzi@to.infn.it
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ID="c" e-mail: prokudin@to.infn.it 相似文献
16.
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
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ID="b" e-mail: kanemu@post.kek.jp 相似文献
17.
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
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ID="a" e-mail: akaranik@cc.uoa.gr
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ID="b" e-mail: cktorid@cc.uoa.gr
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ID="c" e-mail: stefanis@tp2.ruhr-uni-bochum.de 相似文献
18.
A. Borah S. Ghosh S. Nandy 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,29(2):221-225
The novel inelastic collision properties of two-soliton interaction for an n-component coupled higher order nonlinear Schr?dinger equation are studied. Some interesting features of three soliton interactions,
related to the integrability of the n-component coupled higher order nonlinear Schr?dinger equation are also discussed.
Received 17 April 2002 Published online 2 October 2002
RID="a"
ID="a"e-mail: abhijit@iitg.ernet.in
RID="b"
ID="b"e-mail: sasanka@iitg.ernet.in
RID="c"
ID="c"e-mail: sudipta@iitg.ernet.in 相似文献
19.
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
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ID="a" e-mail: czyz@us.edu.pl
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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
20.
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
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ID="d" e-mail: andrevh@sci.kun.nl
RID="e"
ID="e" e-mail: papadopo@alice.nuclear.demokritos.gr 相似文献