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81.
82.
基于SU(3)对称性研究了Xc0的遍举多体衰变xc0→BB^-MM(B:重子,M:介子),通过同位旋耦合常数构造了xc0→BB^-→BB^-MM衰变的跃迁振幅.基于这些跃迁振幅,发现N^*共振态对xc0→BB^-ππ的贡献相对较大,这个衰变道可以在实验上用来研究N^*共振态. 相似文献
83.
C. Hanhart 《The European Physical Journal A - Hadrons and Nuclei》2008,35(3):271-274
A method to identify hadronic molecules in the particle spectrum is reviewed and the conditions for its applicability discussed.
Special emphasis is put on the discussion of molecule candidates in the baryon spectrum. 相似文献
84.
B. Metsch 《The European Physical Journal A - Hadrons and Nuclei》2008,35(3):275-280
The scope of a relativistically covariant constituent quark model of baryons based on the Bethe-Salpeter equation in instantaneous
approximation is illustrated by a discussion of various baryon resonance observables such as static electromagnetic moments
--including a novel calculational procedure-- form factors and helicity amplitudes, semileptonic decays as well as the systematics
of two-body strong decay widths. 相似文献
85.
J/ψ and decays to mesons are a good place to look for glueballs, hybrids and for extracting strange and non-strange components in
mesons. Abundant J/ψ and events have been collected at the Beijing Electron Positron Collider (BEPC). More data will be collected at upgraded BEPC
and CLEO-C. Here we provide explicit PWA formulae for many interesting channels in the covariant tensor formalism.
Received: 29 November 2002 / Accepted: 20 December 2002 / Published online: 25 March 2003
RID="a"
ID="a"e-mail: zoubs@mail.ihep.ac.cn
Communicated by V.V. Anisovich 相似文献
86.
H.?Walliser H.?WeigelEmail author 《The European Physical Journal A - Hadrons and Nuclei》2005,26(3):361-382
We thoroughly compare the bound-state and rigid-rotator approaches to three-flavored chiral solitons. We establish that these
two approaches yield identical results for the baryon spectrum and kaon-nucleon S-matrix in the limit that the number of colors (NC) tends to infinity. After proper subtraction of the background phase shift the bound-state approach indeed exhibits a clear
resonance behavior in the strangeness S = + 1 channel. We present a first dynamical calculation of the widths of the Θ+ and Θ* pentaquarks for finite NC in a chiral soliton model. 相似文献
87.
B. Golob 《中国物理C(英文版)》2008,32(6)
We present a preliminary measurement of the B(Ds→μvμ) with the Belle experiment at the KEKB collider. We select Ds→μvμ decays with a method that provides a high-purity of the selected sample and an absolute measurement of the branching fraction. The results are based on a data sample of 550 fb-1 and are compared to similar measurements by other experiments as well as to the predictions of LQCD. We conclude with short prospects for improvements in the accuracy of the measurement. 相似文献
88.
D S Narayan 《Pramana》1979,12(4):391-395
The production of prompt neutrinos in the beam dump experiment is explained in a cluster model, by postulating the emission
of strange clusters in hadron collisions, besides the usual non-strange clusters. The low mass strange clusters can decay
only by the weak interaction. The leptonic and semi-leptonic decay modes of these clusters give rise to prompt neutrinos.
A prediction of the model is that the ratios <v
e>/π
+ at PS energies would be the same as SPS energies. 相似文献
89.
The parity violating non-leptonic decays of hyperons and of charmed baryons are discussed in the framework of SU (8) symmetry.
Several relations in addition to the ones obtained earlier by using SU (4) symmetry and20″-dominance, are obtained. The assumption of20″-dominance at the SU (4) level is no longer required for explaining the non-leptonic decays of 1/2+ baryons. 相似文献
90.
We consider the τ leptonic decay $\tau\rightarrow
l\bar{\nu}_{l}\nu_{\tau}$ in the framework of the littlest
Higgs (LH) model and calculate the corrections of new particles to
this decay. We find that the contributions of the charged scalars
can be safely ignored and the LH model is in perfect agreement
with the universality of the couplings of the SU gauge bosons
to the leptonic charged currents. The corrections of the LH model
to the τ leptonic decay $\tau\rightarrow
l\bar{\nu}_{l}\nu_{\tau}$ are not sensitive to the parameter
c, but depend strongly on the parameters f and x. The
precision measured data about the τ leptonic decay demand
that the parameter f approximately equal 3.5 TeV and x>0.1, while agree with the general expectation based on other
phenomenological
explorations. 相似文献