Amplitudes for the analysis of the decayJ/ψ→K+K−π0

Abstract

We construct an analytical model for two-channel, two-body scattering amplitudes, and then apply it in the description of the three-body J=c ! K þ K À 0 decay. In the construction of the partial wave amplitudes, we combine the low-energy resonance region with the Regge asymptotic behavior determined from direct two-body production. We find that resonance production in the K channel in J=c decays seems to differ from that observed in direct K production, while the mass distribution in the K " K channel may be compatible.

Testing the phenomenological interacting dark energy with observational H(z) data

“…In this paper, we test the interacting dark energy scenario with a phenomenological scaling solution ρ X ∝ρ m a ξ , which is proposed as a candidate to ease the coincidence problem of the concordance ΛCDM model. With the newly revised observational H ( z ) data, the CMB observation from the WMAP 7 results, the BAO observation from the SDSS DR7 and the Union2 SNe Ia set, we obtain the best‐fitting values of the model parameters in the phenomenological interacting scenario, Ω m0 = 0.27 +0.02 −0.02 (1σ) +0.04 −0.03 (2σ), ξ= 3.15 +0.48 −0.50 (1σ) +0.72 −0.71 (2σ) and w X =−1.05 +0.15 −0.14 (1σ) +0.21 −0.21 (2σ), which are more stringent and consistent with the previous constraint results (Guo et al 2007; Chen et al 2010; Wei 2010a).…”

“…Our results show that the ΛCDM model still remains a good fit to the recent observational data. However, the interaction that the energy transferring from dark matter to dark energy is slightly favoured over the interaction from dark energy to dark matter, which is consistent with that obtained in Guo et al (2007) and Chen et al (2010); therefore, the coincidence problem is quite severe in the phenomenological scenarios. When combined the H ( z ) data with CMB and BAO observations, it is shown that the H ( z ) data can give more stringent constraints on the phenomenological interacting scenario.…”

“…From Figs 1–4 and Table 1, it is shown that our results are more stringent and consistent with the constraint results obtained by combining the previous SNe Ia data to BAO+CMB data (Guo et al 2007; Chen et al 2010; Wei 2010a), and the special case (ξ= 3, w X =−1, corresponding to the ΛCDM with no interaction) is included at the 1σ confidence level with the recent observational data; however, it is also shown that the constraints favour ξ+ 3ω X > 0 for the phenomenological scenario and indicate that the energy is transferred from dark matter to dark energy and the coincidence problem is quite severe, which is consistent with those obtained in Guo et al (2007) and Chen et al (2010). We also find that the H ( z ) data can give more stringent constraints on the phenomenological interacting scenario when combined with CMB and BAO observations.…”

Analytic continuation of the Pasquier inversion representation of the Khuri-Treiman equation

“…The rotation r s , which is given by three Euler angles [33,34], rotates the standard configuration in (12)3 coupling scheme to the actual one. In the standard configuration of (12)3 coupling (rest frame of three-particle), third particle moves along negative z axis while particle-1 and -2 move in the xz plane.…”

Gauss–Bonnet Inflation after Planck2018

“…To import the GB effect on the background dynamics, one way is to consider the GB term in higher dimensions [23,24,25,26,27,28,29]. Another way, if we look for the GB effect in 4 dimensions, is to couple it non-minimally to a scalar filed or adopt a function of GB term in the 4-dimensional action [30,31,32,33,34,35,36,37,38,39,40,41]. Among the works done on this issue, we focus on the models in which the GB term is nonminimally coupled to the scalar field in the theory.…”