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41.
Truly by looking through the analytical model of constituent quarks and further theimportance of the effects of relativity on quark dynamics in studying the interior structure of mesons,in this research we have strived to have a much more precise modeling for quark interior structure.Certainly by observing the constituent model of quarks, at first we consider the mesons as two-body system,then we place the considered calculated Potential, which is a function of location and spin,in Schrödinger's equation. Next we will solve the mentioned equation in analytical method. Moving on this solution,we will import the spin and isospin interactions as perturbation in our problem,and finally by using these solutions we can obtain both binding energy and wave function for bound state and excited states of meson.Eventually, by applying these calculations in the next and last step we will compare our data about meson'sbinding energy and masses with others results. 相似文献
42.
Based on the nuclear effects considered in the Glauber-Gribov approach, charmed meson production in high energy deep inelastic e+A scattering is investigated in the color dipole formalism. Using the Peterson fragmentation function and the KLR-AdS/CFT color dipole model, which reasonably well describes the HERA data for the inclusive structure functions at small Bjorken-x, we present the predictive results for the D-meson transverse spectra at EIC and LHeC energies. The theoretical results indicate that the $x$-independence phenomena at very small-x predicted by the KLR-AdS/CFT model are not seen in our calculation. 相似文献
43.
To explain the anomalously large decay rate of Σ+→p+μ+μ-, it was proposed that a new mechanism where a light CP-odd pseudoscalar boson of mA10=214.3 MeV makes a crucial contribution. Later, some authors have studied the transition π0→ e+e- and r → γA10 in terms of the same mechanism and their result indicates that with the suggested mass one cannot fit the data. This discrepancy might be caused by experimental error of Σ+→ p+μ+μ- because there were only a few events. Whether the mechanism is a reasonable one motivates us to investigate the transitions π0→ e+e-;η(η')→ μ+μ-; ηc→ μ+μ-; ηb→τ+τ- within the same framework. It is noted that for π0→ e+e-, the standard model (SM) prediction is smaller than the data, whereas the experimental central value of η→μ+μ- is also above the SM prediction. It means that there should be extra contributions from other mechanisms and the contribution of A10 may be a possible one. Theoretically calculating the branching ratios of the concerned modes, we would check if we can obtain a universal mass for A10 which reconcile the theoretical predictions and data for all the modes. Unfortunately, we find that it is impossible to have such a mass with the same coupling |gl|. Therefore we conclude that the phenomenology does not favor such a light A10, even though a small window is still open. 相似文献
44.
45.
R.A.Briere 《中国物理C(英文版)》2010,34(6):765-773
Several recent CLEO-c results on hadronic decays of charm mesons are reviewed.Topics include measurements of precision branching fractions for exclusive modes,investigations of inclusive rates,and analyses of Dalitz plots.In addition,the quantum correlations of the D pairs produced at the ψ(3770) are exploited to measure phase information that is of current interest for both D and B physics. 相似文献
46.
H. Müller 《The European Physical Journal A - Hadrons and Nuclei》2001,11(1):113-119
We investigate the reaction pp↦da
0
+ at COSY and SIS energies together with accompanying background reactions and inclusive particle yields. The a
0
+ is considered as a usual u
quark model state with two decay channels a
0
+↦K
+
and a
0
+↦π+η. Calculated cross-sections for a
0
+ production as well as for the corresponding non-resonant channels pp↦dK
+
and pp↦dπ+η are compared. Especially, in case of the final channel dπ+η, high statistics measurements are necessary to extract the a
0
+ signal from the high non-resonant background.
Received: 20 December 2000 / Accepted: 7 May 2001 相似文献
47.
48.
GAO Chong-Shou ZHU Shi-Lin 《理论物理通讯》2004,42(12)
We comment on the quantum numbers and decay channels of the proton-antiproton enhancement observed by BES Collaboration. Based on the general symmetry consideration and available experimental information, we suggest that the quantum number of this possible signal is very likely to be JPC = 0- , IG = O , which cannot decay into final states π π-, 2π0, KK, 3π. Besides its dissociation into pp, the other important mesonic decay modes could be ηππ, η‘ππ, ηηη, 4π, KKπ, ηKK, KKππ, 6π. Experimental search of this signal in these meson final states is strongly called for. 相似文献
49.
Mass regularities forS- andP-wave mesons and relations between their masses are discussed. A detailed analysis is given forS-wave mesons which extends the investigations onP-wave mesons reported earlier. Masses for theS- andP-states of all interesting
-systems (including toponium states) are predicted. Partial understanding of the mass formulae is obtained within a general
potential model approach. Scaling arguments are presented which support the empirical scaling behaviour found for the expectation
values determining the spin-splittings in the potential picture. 相似文献
50.
The decays η,
→ π+π-
l
+
l
- (with l = e,μ are investigated within a chiral unitary approach which combines the chiral effective Lagrangian with a coupled-channels
Bethe-Salpeter equation. Predictions for the decay widths and spectra are given. 相似文献