J/ψ DECAYS AND η-η′-ι MIXING

1994 ◽  
Vol 09 (31) ◽  
pp. 5489-5506 ◽  
Author(s):  
ICHIJIRO KITAMURA ◽  
NORIKAZU MORISITA ◽  
TADAYUKI TESHIMA
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Mass Region ◽  
High Mass ◽  
Radial Excitation ◽  
Recent Experimental Data ◽  
Chiral Perturbation ◽  
Pseudoscalar Mesons ◽  
Low Mass ◽  
Excitation State

The mass region near η(1440) has more than one resonance, and two resonances with M≈1420 MeV and M≈1490 MeV are shown to give a better description of the recent experimental data. We investigate whether η(1420) or η(1490) is the glueball, if it exists, and which of them is the isospin 0 partner of the radially excited state η(1295) expected to exist near the 1500–1600 MeV region. We study the J/ψ→VP and Pγ decays, using the new data of 1992, to estimate the mixing among (η, η′, ι), where ι refers to the glueball, and obtain the result that the N component in ι is larger than the S component. Comparing the N and S components in ι with the N and S components in η(1420) and η(1490) obtained from their decaying pattern, we conjecture that the low mass state η(1420) is the glueball and the high mass state η(1490) is the radial excitation state. We discuss the relation between the mass formulae for the pseudoscalar mesons and the mixing among (η, η′, ι) obtained considering the chiral perturbation theory and the chiral U(3) × U(3) symmetry formulation.

Resonant and non-resonant contributions of B → K∗(p1,𝜖1){Kπ,ππ,KK} decay modes

2019 ◽  
Vol 34 (06) ◽  
pp. 1950043
Author(s):  
Mahboobeh Sayahi
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Branching Ratio ◽  
Heavy Meson ◽  
Chiral Perturbation ◽  
Decay Modes ◽  
Qcd Factorization ◽  
Three Body ◽  
Good Agreement

In this paper, the non-leptonic three-body decays [Formula: see text], [Formula: see text], [Formula: see text] are studied by introducing two-meson distribution amplitude for the [Formula: see text], [Formula: see text] and [Formula: see text] pairs in naive and QCD factorization (QCDF) approaches, such that the analysis is simplified into quasi-two body decays. By considering that the vector meson is being ejected in factorization, the resonant and non-resonant contributions are analyzed by using intermediate mesons in Breit–Wigner resonance formalism and the heavy meson chiral perturbation theory (HMChPT), respectively. The calculated values of the resonant and non-resonant branching ratio of [Formula: see text], [Formula: see text] and [Formula: see text] decay modes are compared with the experimental data. For [Formula: see text] and [Formula: see text], the non-resonant contributions are about 70–80% of experimental data, for which the total results by considering resonant contributions are in good agreement with the experiment.

Convergence issues in baryon chiral perturbation theory for the reaction π + N → 2π + N

2007 ◽  
Vol 85 (6) ◽  
pp. 663-669
Author(s):  
N Mobed ◽  
J Zhang ◽  
D Singh
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Essential Role ◽  
Heavy Baryon ◽  
Transverse Polarization ◽  
Proton Target ◽  
Chiral Perturbation ◽  
Target Asymmetry ◽  
Chiral Order

We study the reaction π + N → 2π + N within the framework of heavy-baryon chiral perturbation theory of chiral order three. We find that contributions from amplitudes of chiral order three are large and play an essential role in reproducing the experimental data. In addition, we evaluate a polarization observable (target asymmetry) for the transverse polarization of the proton target and find that the asymmetry is generally small for the reaction under consideration. PACS Nos.: 25.80.Hp, 13.75.Gx, 11.30.Rd, 11.10.Ef

scholarly journals Taylor's Series and Dispersion Relation Analyses of the Vector Pion Form Factor and their Comparison with Perturbative and Non Perturbative Calculations

2015 ◽  
Vol 25 (1) ◽  
pp. 21
Author(s):  
Truong Nguyen Tran
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Form Factor ◽  
Dispersion Relation ◽  
Momentum Transfer ◽  
Chiral Perturbation Theory ◽  
Pion Form Factor ◽  
P Wave ◽  
Chiral Perturbation ◽  
Taylor’S Series

The first three coefficients of the Taylor's series expansion of the vevtor pion form factor as a function of the momentum transfer are evaluated using the experimental data on the pion form factor and the P-wave \(\pi\pi\) phase shifts. The real part of the form factor as a function of energy is also calculated by dispersion relation. Comparisons there results with Chiral Perturbation Theory and unitarized models are given.

scholarly journals LATTICE STUDY ON KAON–NUCLEON SCATTERING LENGTH IN THE I=1 CHANNEL

2004 ◽  
Vol 19 (26) ◽  
pp. 4401-4412 ◽  
Author(s):  
GUANGWEI MENG ◽  
CHUAN MIAO ◽  
XINING DU ◽  
CHUAN LIU
Keyword(s):  
Perturbation Theory ◽  
Lattice Spacing ◽  
Continuum Limit ◽  
Scattering Length ◽  
Finite Lattice ◽  
Mass Region ◽  
Infinite Volume ◽  
Chiral Perturbation ◽  
Kaon Mass ◽  
Anisotropic Lattices

Using the tadpole improved clover Wilson quark action on small, coarse and anisotropic lattices, KN scattering length in the I=1 channel is calculated within quenched approximation. The results are extrapolated towards the chiral and physical kaon mass region. Finite volume and finite lattice spacing errors are also analyzed and a result in the infinite volume and continuum limit is obtained which is compatible with the experiment and the results from Chiral Perturbation Theory.

scholarly journals The pole structure of low energy πN scattering amplitudes

2019 ◽  
Vol 199 ◽  
pp. 02004
Author(s):  
Yu-Fei Wang
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Scattering Amplitudes ◽  
Low Energy ◽  
Tree Level ◽  
Chiral Perturbation ◽  
Left Hand ◽  
Pole Structure ◽  
Pion Nucleon ◽  
Branch Cuts

This report presents an investigation of the pion-nucleon elastic scattering in low energy region using a production representation of the partial wave S matrix. The phase shifts are separated into contributions from poles and branch cuts, where the left-hand cut term can be evaluated by tree-level covariant baryon chiral perturbation theory. A comparison between the sum of known contributions and the data in S- and P- wave channels is made. It is found that the known components in S11 and P11 channels are far from enough to saturate the corresponding experimental data, indicating the existence of low-lying hidden poles. The positions of those hidden poles are figured out and the physics behind them are explored.

scholarly journals Pseudoscalar Mesons Scattering offD*-mesons with Chiral Perturbation Theory

2012 ◽  
Vol 20 ◽  
pp. 02004
Author(s):  
Zhan-Wei Liu ◽  
Yan-Rui Liu ◽  
Xiang Liu ◽  
Shi-Lin Zhu
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Chiral Perturbation ◽  
Pseudoscalar Mesons

Search for New Physics with High Mass Tau Pairs in CDF Run II

2005 ◽  
Vol 20 (15) ◽  
pp. 3287-3289
Author(s):  
Zongru Wan
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
Branching Ratio ◽  
New Physics ◽  
Mass Region ◽  
High Mass ◽  
Significant Excess ◽  
Upper Limits ◽  
Tau Pairs ◽  
Low Mass

We present the results of a search for new particles decaying to tau pairs. Hypothetical particles, such as Z′ and MSSM Higgs boson A can potentially produce such pairs. The low-mass region, dominated by Z → ττ, is used as a control. No significant excess events over the estimated backgrounds is observed in the high-mass region, and we set upper limits on the cross section times branching ratio as a function of the Z′ and A mass.

scholarly journals Revisiting $\bar{K}N$ scattering and relevant baryon resonances

2014 ◽  
Vol 29 ◽  
pp. 1460242
Author(s):  
Zhi-Hui Guo ◽  
J. A. Oller
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Wave Scattering ◽  
Threshold Behavior ◽  
S Wave ◽  
Chiral Perturbation ◽  
Baryon Spectroscopy ◽  
Baryon Resonances

We give an updated study on meson-baryon scattering within the framework of unitary chiral perturbation theory. We focus on S-wave scattering with strangeness -1 channel. After fixing the unknown couplings through fitting to experimental data, we then analyze the baryon spectroscopy and the sub-threshold behavior of the [Formula: see text] amplitude. We end with a summary and a brief outlook.

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