119408784
Meson spectrum in Regge phenomenology
Abstract.Under the assumption that both light and heavy quarkonia populate approximately linear Regge trajectories with the requirements of additivity of intercepts and inverse slopes, the masses of different meson multiplets are estimated. The predictions derived from the quasi-linear Regge trajectories are in reasonable agreement with those given by many other references.
119422623
Regarding the axial-vector mesons
Abstract.The implications of the f1(1285)-f1(1420) mixing for the K1(3P1)- K1(1P1) mixing angle are investigated. Based on the f1(1285)-f1(1420) mixing angle ∼ 50° suggested from the analysis for a substantial body of data concerning the f1(1420) and f1(1285), the masses of the K1(3P1) and K1(1P1) are determined to be ∼ 1307.35±0.63 MeV and 1370.03±9.69 MeV, respectively, which therefore suggests that the K1(3P1)- K1(1P1) mixing angle is about ±(59.55±2.81)°. Also, it is found that the mass of the h′1(1P1) (mostly of s¯) state is about 1495.18±8.82 MeV. Comparison of the predicted results and the available experimental information of the h1(1380) shows that without further confirmation on the h1(1380), the assignment of the h1(1380) as the s¯ member of the 1P1 meson nonet may be premature.
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°.
120300371
MESON MIXING AND THE MASS OF THE ISODOUBLET OF 2 1S0 NONET
Based on the mass relation derived under the assumption that for the almost ideally mixing meson nonets, the corrections deduced by the flavor-dependent quarkonia transition can be ignored, the mass of the isodoublet of the 2 1S0 nonet is predicted to be 1391.8±67.7 MeV. The quarkonia content of isoscalar states of the 2 1S0 nonet, i.e. η(1295) and η(1475), is given, and some predictions on the decays of the two isoscalar state are presented. These predictions can be tested in Beijing Electron Positron Collider Bejing Spectrometers (BEPC/BES) with 58 million J/ψ events in the near future.
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.
122880432
The mass relation between the pure and physical ground pseudoscalar glueballs
The experimental information indicates that for the ground pseudoscalar states, the omission of the transition amplitudes between quarkonia can result in the unreasonable result. It is believed that the mass of the pure glueball employed in the general form of the mass matrix is different from the mass predicted by lattice QCD in quenched approximation for the ground pseudoscalar glueball. The mass relation between the pure and physical ground pseudoscalar glueballs is determined from the experimental data.
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.
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.
118791578
Superembedding Methods for Current Superfields
We extend the superembedding formalism for 4D N=1 superconformal field theory (SCFT) to the case of fields in arbitrary representations of the superconformal group SU(2,2|1). As applications we obtain manifestly superconformally covariant expressions for two- and three-point functions involving conserved currents, e.g. the supercurrent multiplet or global symmetry current superfields. The embedding space results are presented in a compact form by employing an index-free formalism. Our expressions are consistent with the literature, but the manifestly covariant forms of correlators presented here are new.
118698107
Electroweak corrections from triplet scalars
We compute the electroweak S and T parameters induced by SU(2)_L triplet scalars up to one-loop order. We consider the most general renormalizable potential for a triplet and the Standard Model Higgs doublet. Our calculation is performed by integrating out the triplet at the one-loop level and also includes the one-loop renormalization group running. Effective field theory framework allows us to work in the phase with unbroken SU(2)_L x U(1)_Y symmetry. Both S and T parameters exhibit decoupling when all dimensionful parameters are large while keeping dimensionless ratios fixed. We use bounds on S and T to constrain the triplet mass and couplings.