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.
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°.
118923911
Gravitomagnetic monopole derivable from Dirac theory
Based on the mathematical similarity between the linearized theory of gravitation and electrodynamics, we investigate a new scenario for Einstein equations. It shows that making the equations more symmetric allows us to introduce the concept of gravitomagnetic monopoles and express them in Dirac form. Accordingly, a generalized Dirac condition is presented, which can be treated as a weak limitation on massive charges.
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.