共查询到20条相似文献,搜索用时 859 毫秒
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本文指出(3/2)~+与(1/2)~+重子相对权重的改变对末态长寿命重子产额没有影响,而对(3/2)~+重子产额改变显著.分析e~+e~-实验资料发现对(3/2)~+重子很强的抑制参数为0.3,由此得到的末态重子产额及产额比才能与实验符合. 相似文献
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高能反应中,自旋3+/2重子的产生与1+/2重子相比,受到反常的极强抑制.本文证明这是夸克味道守恒的结果:多重产生中奇异夸克抑制.λ=/<1,决定了十重态重子只能以确定比例β与八重态重子一起产生,而且β=1+λ/3+2λ 相似文献
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运用相对论性的流体力学模型,研究了夸克-胶子火球的双轻子产生,发现随着初始温度的增加零重子的夸克-胶子火球的双轻子总产额在一个平台后单调地上升,而随着初始重子密度的增加富重子的夸克-胶子火球的双轻子总产额呈现一个样.夸克-胶子物质在碰撞中形成的特征可在将来的CERN和Brookhaven实验中得到检验. 相似文献
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本文在层子模型的基础上,用[2]中给出的基态介子、重子波函数的一般形式,在一些假定下,构造了不具有 SU6对称性的介子、重子波函数;用这些波函数去解释介子、重子的电磁、弱作用性质,得到许多与实验相符合的结果.这种不具有 SU6对称性的((1+)/2)重子波函数可以给出质子的反常磁矩,而不需要在层子的等效电磁作用哈密顿量中引入层子反常磁矩项,也可以较好地解释中子的磁矩. 相似文献
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Mir Faizal 《理论物理通讯》2014,62(5):697-700
In this paper we will analyze the third quantization of gravity in path integral formalism. We will use the time-dependent version of Wheeler-DeWitt equation to analyze the multiverse in this formalism. We will propose a mechanism for baryogenesis to occur in the multiverse, without violating the baryon number conservation. 相似文献
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THE COMPOSITE SOLITON SOLUTION WITH BARYON NUMBER B=0 BUT HOPF INDEX H=1 IN THE SKYRME MODEL 下载免费PDF全文
In the SU(2)×SU(2) Skyrme model,one can treat the topological soliton-Skyrmion having baryon number B=1 as baryon.In this paper,we have used Skyrmion and anti-Skyrmion to construct a kind of composite soliton solution having baryon number B=0 but Hopf index H=1 and have found its mass depends on a dimensionless parameter p(0<p≤1).In addition,we have also discussed the quantization of the soliton and the probability of treating the quantized soliton as baryonium. 相似文献
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The Atiyah-Manton (AM) construction based on instantons is used to construct skyrmions. For baryon number one, an analytic form for the skyrmion is obtained that compares well with the exact solution. For baryon number two, we study skyrmion interactions and distortion as a function of relative distance and orientation. From this we project out a nucleon-nucleon interaction. We find the principal features of the nuclear force but still no intermediate-range attraction. We compare the AM construction with the product ansatz. 相似文献
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B. Andersson G. Gustafson G. Ingelman T. Sjöstrand 《Zeitschrift fur Physik C Particles and Fields》1982,13(4):361-367
We study baryon production in deep inelastic scattering using an extended version of the Lund jet model. There are two contributing sources. The first is baryon production in the target fragmentation. In a scheme related to our earlier work on lowp hu baryon fragmentation we present some details of the fragmentation of a diquark into baryons and mesons. A non-negligible baryon-antibaryon production is observed ine + e ? annihilation. In a previous paper we developed a model for this production, and the same mechanism should also give fast baryons in leptoproduction. In this paper we discuss those features of baryon production which can be more easily studied in a leptoproduction experiment. 相似文献
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Gianpiero Gervino Andrea Lavagno Daniele Pigato 《Central European Journal of Physics》2012,10(3):594-601
We investigate the relativistic equation of state of hadronic matter and quark-gluon plasma at finite temperature and baryon
density in the framework of the non-extensive statistical mechanics, characterized by power-law quantum distributions. We
impose the Gibbs conditions on the global conservation of baryon number, electric charge and strangeness number. For the hadronic
phase, we study an extended relativistic mean-field theoretical model with the inclusion of strange particles (hyperons and
mesons). For the quark sector, we employ an extended MIT-Bag model. In this context we focus on the relevance of non-extensive
effects in the presence of strange matter. 相似文献
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Soma Sanyal 《Pramana》2003,61(5):1033-1037
Baryon number inhomogeneities may be generated during the epoch when the baryon asymmetry of the universe is produced, e.g.
at the electroweak phase transition. These lumps will have a lower temperature than the background. Also the value ofT
c
will be different in these regions. Since a first-order quark-hadron (Q–H) transition is susceptible to small changes in
temperature, we investigate the effect of the presence of such baryonic lumps on the dynamics of the Q–H transition. We find
that the phase transition is delayed in these lumps for significant overdensities. Consequently, we argue that baryon concentration
in these regions grows by the end of the transition. We mention some models which may give rise to such high baryon overdensities
before the Q–H transition. 相似文献
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In this study, we investigate the possibilities of generating baryon number asymmetry under thermal equilibrium within the frameworks of teleparallel and symmetric teleparallel gravities. Through the derivative couplings of the torsion scalar and the non-metricity scalar to baryons, baryon number asymmetry is produced in the radiation dominated epoch. For gravitational baryogenesis mechanisms in these two frameworks, the produced baryon-to-entropy ratio is too small to be consistent with observations. However, the gravitational leptogenesis models within both frameworks have the potential to explain the observed baryon-antibaryon asymmetry. 相似文献
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I.I. Bigi 《The European Physical Journal C - Particles and Fields》2002,24(2):271-274
The B factories are expected to provide huge samples of single B decay events with little background by reconstructing one of the B mesons produced in decays. This represents a new experimental paradigm: such samples will allow to make measurements of a quality previously
thought unrealistic. As example we discuss how absolute branching ratios for exclusive as well as inclusive charm baryon decays
can be extracted. One starts out by observing decays like as a signature for etc. and then exploits various correlations of the flavour of the B meson with the baryon number of the (anti)proton and other observables like the charge of a lepton, baryon number of another
baryon etc. An integrated luminosity of about 500 fb-1 as could be available by 2005 should be sufficient for the task.
Received: 21 December 2001 / Published online: 8 May 2002 相似文献
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Thomas Schäfer 《Pramana》2003,60(4):697-709
We review recent work on the phase structure of QCD at very high baryon density. We introduce the phenomenon of color superconductivity
and discuss the use of weak coupling methods. We study the phase structure as a function of the number of flavors and their
masses. We also introduce effective theories that describe low energy excitations at high baryon density. Finally, we comment
on the possibility of kaon condensation at very large baryon density. 相似文献