The decay rate for eta-->3pi is calculated with use of the u3 tadpole piece of the quark Hamilton... more The decay rate for eta-->3pi is calculated with use of the u3 tadpole piece of the quark Hamiltonian, but without assumptions of chiral perturbation theory. The calculation is performed within the framework of the bag model; however, the results are independent of bag parameters and depend only on (1) the light quark mass difference |mu-md| and (2) the quark structure of the ε(700). Comparison of the present calculated eta decay rate with experiment shows that most theoretical estimates of mu-md imply a substantial four-quark component in the ε(700).
Dual x-ray absorptiometry is widely used in analyzing body composition and imaging. We discuss th... more Dual x-ray absorptiometry is widely used in analyzing body composition and imaging. We discuss the physics of the method and exhibit its limitations and show it is related to the Compton and photoelectric contributions to the x-ray absorption coefficients of materials.
A phenomenological model of the Regge trajectory of the rho meson, based on a dispersion relation... more A phenomenological model of the Regge trajectory of the rho meson, based on a dispersion relation for the trajectory function and a parametrized absorptive part, is constructed and compared with existing data for t<=0, and with possibly observed recurrences. A linear term, which may or may not be entirely due to inelastic channels, is required to explain the data.
A phenomenological model of the Regge trajectory of the ρ meson, based on a dispersion relation f... more A phenomenological model of the Regge trajectory of the ρ meson, based on a dispersion relation for the trajectory function and a parametrized absorptive part, is constructed and compared with existing data for t<=0, and with possibly observed recurrences. A linear term, which may or may not be entirely due to inelastic channels, is required to explain the data.
We study the threshold singularities in the J plane for spinor and scalar massive quantum electro... more We study the threshold singularities in the J plane for spinor and scalar massive quantum electrodynamics. It is found that they are responsible for the promotion phenomenon discussed recently by Cheng and Wu.
Using an off-energy-shell static theory which treats three-particle unitarity exactly, but neglec... more Using an off-energy-shell static theory which treats three-particle unitarity exactly, but neglects left-hand cuts, we describe rather well the low-energy P-wave Nπ system. We obtain a well-satisfied "bootstrap" requirement in the (3,3) channel and a possible explanation for the Roper resonance in the (1,1) channel.
We propose a nonrelativistic potential formalism for treating multiquark systems, based on an ext... more We propose a nonrelativistic potential formalism for treating multiquark systems, based on an extension of projection-operator techniques developed by Feshbach. As an application of our formalism we develop the bag-model-P-matrix connection suggested by Jaffe and Low.
LIVA (Light Induced Voltage Alterations) and TIVA (Thermally Induced Voltage Alterations) have de... more LIVA (Light Induced Voltage Alterations) and TIVA (Thermally Induced Voltage Alterations) have demonstrated significant capability for fault isolation. A difficulty with both techniques is their use of a constant current source, whereas integrated circuits operate with a constant voltage source. A new technique that utilizes the constant current sensing of LIVA/TIVA, while allowing for use of constant voltage bias on the integrated circuit, has been developed. As a bonus, the technique is also significantly more sensitive (at least one order of magnitude) than the standard LIVA/TIVA approach.
Inelastic effects (rho production, Delta production) and particle-exchange effects are shown to d... more Inelastic effects (rho production, Delta production) and particle-exchange effects are shown to determine the major features of the pi-ND13, D33, and P13 waves. The D33(1670) is associated with a resonance pole but the P13(1860) is not.
We analyze 3m production results obtained from recent di6'ractive and charge-exchange experim... more We analyze 3m production results obtained from recent di6'ractive and charge-exchange experiments. We find that two resonances, a J = 1+ (A,) and a J =0 (m') are required by the data. The resonance parameters are M", = 1230~30 MeV, I'", = 350~60 MeV, and M, = 1273~50 MeV, I",= 580+100 MeV. We interpret the above resonances in terms of qq and q'q' quark-model states.
A model proposed by Aaron and Friedman is used to study q/sup 2/q-bar/sup 2/ states. Our results ... more A model proposed by Aaron and Friedman is used to study q/sup 2/q-bar/sup 2/ states. Our results lead to speculations concerning the nature of the epsilon(1300).
The decay rate for eta-->3pi is calculated with use of the u3 tadpole piece of the quark Hamilton... more The decay rate for eta-->3pi is calculated with use of the u3 tadpole piece of the quark Hamiltonian, but without assumptions of chiral perturbation theory. The calculation is performed within the framework of the bag model; however, the results are independent of bag parameters and depend only on (1) the light quark mass difference |mu-md| and (2) the quark structure of the ε(700). Comparison of the present calculated eta decay rate with experiment shows that most theoretical estimates of mu-md imply a substantial four-quark component in the ε(700).
Dual x-ray absorptiometry is widely used in analyzing body composition and imaging. We discuss th... more Dual x-ray absorptiometry is widely used in analyzing body composition and imaging. We discuss the physics of the method and exhibit its limitations and show it is related to the Compton and photoelectric contributions to the x-ray absorption coefficients of materials.
A phenomenological model of the Regge trajectory of the rho meson, based on a dispersion relation... more A phenomenological model of the Regge trajectory of the rho meson, based on a dispersion relation for the trajectory function and a parametrized absorptive part, is constructed and compared with existing data for t&amp;amp;amp;amp;lt;=0, and with possibly observed recurrences. A linear term, which may or may not be entirely due to inelastic channels, is required to explain the data.
A phenomenological model of the Regge trajectory of the ρ meson, based on a dispersion relation f... more A phenomenological model of the Regge trajectory of the ρ meson, based on a dispersion relation for the trajectory function and a parametrized absorptive part, is constructed and compared with existing data for t<=0, and with possibly observed recurrences. A linear term, which may or may not be entirely due to inelastic channels, is required to explain the data.
We study the threshold singularities in the J plane for spinor and scalar massive quantum electro... more We study the threshold singularities in the J plane for spinor and scalar massive quantum electrodynamics. It is found that they are responsible for the promotion phenomenon discussed recently by Cheng and Wu.
Using an off-energy-shell static theory which treats three-particle unitarity exactly, but neglec... more Using an off-energy-shell static theory which treats three-particle unitarity exactly, but neglects left-hand cuts, we describe rather well the low-energy P-wave Nπ system. We obtain a well-satisfied "bootstrap" requirement in the (3,3) channel and a possible explanation for the Roper resonance in the (1,1) channel.
We propose a nonrelativistic potential formalism for treating multiquark systems, based on an ext... more We propose a nonrelativistic potential formalism for treating multiquark systems, based on an extension of projection-operator techniques developed by Feshbach. As an application of our formalism we develop the bag-model-P-matrix connection suggested by Jaffe and Low.
LIVA (Light Induced Voltage Alterations) and TIVA (Thermally Induced Voltage Alterations) have de... more LIVA (Light Induced Voltage Alterations) and TIVA (Thermally Induced Voltage Alterations) have demonstrated significant capability for fault isolation. A difficulty with both techniques is their use of a constant current source, whereas integrated circuits operate with a constant voltage source. A new technique that utilizes the constant current sensing of LIVA/TIVA, while allowing for use of constant voltage bias on the integrated circuit, has been developed. As a bonus, the technique is also significantly more sensitive (at least one order of magnitude) than the standard LIVA/TIVA approach.
Inelastic effects (rho production, Delta production) and particle-exchange effects are shown to d... more Inelastic effects (rho production, Delta production) and particle-exchange effects are shown to determine the major features of the pi-ND13, D33, and P13 waves. The D33(1670) is associated with a resonance pole but the P13(1860) is not.
We analyze 3m production results obtained from recent di6'ractive and charge-exchange experim... more We analyze 3m production results obtained from recent di6'ractive and charge-exchange experiments. We find that two resonances, a J = 1+ (A,) and a J =0 (m') are required by the data. The resonance parameters are M", = 1230~30 MeV, I'", = 350~60 MeV, and M, = 1273~50 MeV, I",= 580+100 MeV. We interpret the above resonances in terms of qq and q'q' quark-model states.
A model proposed by Aaron and Friedman is used to study q/sup 2/q-bar/sup 2/ states. Our results ... more A model proposed by Aaron and Friedman is used to study q/sup 2/q-bar/sup 2/ states. Our results lead to speculations concerning the nature of the epsilon(1300).
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Papers by Ronald Aaron