118671709
The newly observed open-charm states in quark model
Comparing the measured properties of the newly observed open-charm states D(2550), D(2600), D(2750), D(2760), Ds1(2710), DsJ(2860), and DsJ(3040) with our predicted spectroscopy and strong decays in a constituent quark model, we find that (1) the D(2 1S0) assignment to D(2550) remains open for its too broad width determined by experiment; (2) the D(2600) and Ds1(2710) can be identified as the 2 3S1–1 3D1 mixtures; (3) if the D(2760) and D(2750) are indeed the same resonance, they would be the D(1 3D3); otherwise, they could be assigned as the D(1 3D3) and $D^{\prime}_{2}(1D)$, respectively; (4) the DsJ(2860) could be either the Ds1(2710)’s partner or the Ds(1 3D3); and (5) both the Ds1(2P) and $D^{\prime}_{s1}(2P)$ interpretations for the DsJ(3040) seem likely. The E1 and M1 radiative decays of these sates are also studied. Further experimental efforts are needed to test the present quarkonium assignments for these new open-charm states.
117481192
Glueball-quarkonia content of the f(0)(1370), f(0)(1500) and f(0)(1710)
Based on a 3 x 3 mass matrix describing the mixing of the scalar states f(o)(1370), f(o)(1500) and f(o)(1710), the hadronic decays of the three states are investigated. Taking into account the two possible assumptions concerning the mass level order of the bare states \N] = \ + ]/root2, \S] = \) and \G] = \gg] in the scalar sector, M-G > M-S > M-N and M-G > M-N > M-S, the gIueball-quarkonia content of the three states is obtained by solving the nonlinear equations. Some predictions about the hadronic and two-photon decays of the three states in two cases are presented. It is pointed out that the predictions about the two-photon decay width ratios for the three states can provide a stringent consistency check of the two assumptions.
119692657
Regarding the scalar mesons
Based on the main assumption that the D{sub sJ}(2860) belongs to the 2{sup 3}P{sub 0} qq multiplet, the masses of the scalar meson nonet are estimated in the framework of the relativistic independent quark model, Regge phenomenology, and meson-meson mixing. We suggest that the a{sub 0}(1005), K{sub 0}*(1062), f{sub 0}(1103), and f{sub 0}(564) constitute the ground scalar meson nonet; it is supposed that these states would likely correspond to the observed states a{sub 0}(980), {kappa}(900), f{sub 0}(980), and f{sub 0}(600)/{sigma}, respectively. Also a{sub 0}(1516), K{sub 0}*(1669), f{sub 0}(1788), and f{sub 0}(1284) constitute the first radial scalar meson nonet, it is supposed that these states would likely correspond to the observed states a{sub 0}(1450), K{sub 0}*(1430), f{sub 0}(1710), and f{sub 0}(1370), respectively. The scalar state f{sub 0}(1500) may be a good candidate for the ground scalar glueball. The agreement between the present findings and those given by other different approaches is satisfactory.
119331385
Strange axial-vector mesons mixing angle
Abstract.The masses of K1(3P1) and K1(1P1) are considered in a nonrelativistic constituent quark model, and the absolute value of the K1(3P1)- K1(1P1) mixing angle is determined to be about 59.29°. The comparison of the theoretical predictions on the strong decay widths of K1(1270) and K1(1400) in the 3P0 decay model as well as the production ratio of these two states in the τ decay between the available experimental data strongly favors that the K1(3P1)- K1(1P1) mixing angle is about +59.29°.
15052615
On the nature of the pi(2)(1880)
The strong decays of the $\pi_2(1880)$ as the $2 ^1D_2$ quark-antiquark state are investigated in the $^3P_0$ model and the flux-tube model, respectively. The results are similar in the two models. It is found that the decay patterns of the conventional $2 ^1D_2$ meson and the $2^{-+}$ light hybrid are very different, and the experimental evidence for the $\pi_2(1880)$ is consistent with it being the conventional $2 ^1D_2$ meson rather than the $2^{-+}$ light hybrid. The possibility of the $\pi_2(1880)$ being a mixture of the conventional $q\bar{q}$ and the hybrid is discussed.
18661102
eta(2225) observed by BES Collaboration
In the framework of the P0 meson decay model, the strong decays of the 3 S0 and 4 S0 ss̄ states are investigated. It is found that in the presence of the initial state mass being 2.24 GeV, the total widths of the 3 S0 and 4 S0 ss̄ states are about 438 MeV and 125 MeV, respectively. Also, when the initial state mass varies from 2220 to 2400 MeV, the total width of the 4 S0 ss̄ state changes from about 100 MeV to 132 MeV, while the total width of the 3 S0 ss̄ changes from about 400 MeV to 594 MeV. A comparison of the predicted widths and the experimental result of (0.19 ± 0.03 −0.06) GeV, the width of the η(2225) with a mass of (2.24 −0.02−0.02) GeV recently observed by BES Collaboration in the radiative decay J/ψ → γφφ → γKKK S K L , suggests that it would be very difficult to identify the η(2225) as the 3 S0 ss̄, and the η(2225) seams a good candidate for the 4 S0 ss̄ state.
53143827
OPE methods for the holomorphic Higgs portal
A bstractWe develop a systematic and general approach to study the effective Higgs Lagrangian in a supersymmetric framework in which the Higgs fields in the visible sector couple weakly to another sector. The extra sector may be strongly coupled in general. It is assumed to be superconformal in the ultraviolet, but develop a mass-gap with supersymmetry breaking in the infrared. The main technique used in our approach is that of the operator product expansion (OPE). By using OPE methods we are able to compute the parameters in the Higgs Lagrangian to quadratic order and make general statements that are applicable to many classes of models. Not only does this approach allow us to understand the traditional problems plaguing simple models from a different perspective, it also reveals new possibilities for solutions of these problems. The methods and results of our work should be useful in constructing a viable and natural model of physics beyond the Standard Model.
118565688
Superembedding Formalism and Supertwistors
We establish a correspondence between superembedding and supertwistor methods for constructing 4D N = 1 SCFT correlation functions by deriving a simple relation between tensors used in the two methods. Our discussion applies equally to 4D CFTs by simply reducing all formulas to the N = 0 case.