119168012
Nucleon pole contribution in the $pp\to ppK^+K^-$ reaction below the $\phi$ meson threshold
Nucleon pole contribution in the $pp\to ppK^+K^-$ reaction below the threshold of the production of the $\phi$ meson is studied within the effective Lagrangian approach. It is assumed that the $K^- p$ final state originates from the decay of the hyperons $\Lambda(1115)$ and $\Lambda(1405)$. In addition to the $pp$ final state interaction (FSI) parametrized using the Jost function, we have also considered the $K^+K^-$ FSI with the techniques of the chiral unitary approach, where the scalar mesons $f_0(980)$ and $a_0(980)$ were dynamically generated. Hence, the contributions from scalar mesons $f_0(980)$ and $a_0(980)$ occur through the $K^+ K^-$ FSI. It is shown that the available experimental data are well reproduced, especially the total cross sections and the invariant mass distributions of $pp$ and $K^+K^-$. Furthermore, different forms of the couplings (pseudoscalar and pseudovector) for the $\pi NN$ interaction and different strengths for the proton-proton FSI are also investigated. It is found that the contributions from hyperon $\Lambda(1115)$ and $\Lambda(1405)$ are different between these two kinds of couplings. On the other hand, the effects of the proton-proton FSI can be adjusted by the cut off parameters used in the form factors.
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.
16933705
ON THE MIXING OF THE SCALAR MESONS f0(1370), f0(1500) AND f0(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 into two pseudoscalar mesons are investigated. Under the possible assumption concerning the mass level order of the bare states \N] = \u (u) over bar + d (d) over bar]/root2, \S] = \s (s) over bar) and \G) = \gg] in the scalar sector, M-G > M-N > M-S, the implications of some of the observed branching ratios for the glueball-quarkonia content of the three states are studied. Some predictions about the decays of the three states are presented, which can provide stringent consistency checks for our assumption.
119828482
ON THE PROBLEM OF THE ISODOUBLET OF THE 2 3S1 MESON NONET
Employing three different and complementary approaches, chiral equal-splitting laws, Regge phenomenology and meson–meson mixing, we show that the mass of the isodoublet of the 2 3S1 meson nonet is in the range in 1530–1580 MeV.
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°.
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.
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.
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.
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.