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Assuming that the off-shell Ball amplitudes for π - + p → ρ 0 + n not only satisfy the constraints imposed by current conservation but also are smooth in the vector-meson mass, we predict all the amplitudes (including longitudinal) for π - + p → ρ 0 + n from single-pion photoproduction....
Some remarks are made about the recoil deuteron vector polarization in elastic electron-deuteron scattering and the relation to time-reversal invariance.
Using appropriate continuity arguments in the SU ( + ) ( 3 ) ⊗ SU ( - ) ( 3 ) subgroup space, a new sum rule has been derived for K l 3 decays. This sum rule incorporates corrections to the soft-pion theorem and contains K l 3 form factors defined at a point much closer to the physical decay...
Several applications of a simple approach to unitarization in the case of the three-point functions of hard-meson theory are made. For the first of these, effective-range formulas are obtained for the pion form factor in the timelike region for both hard-pion current-algebra ( δ = - 1 2 ) and...
A study of the possibility of using an absorption model to obtain a unique s -wave I = 0 π π phase shift from the reaction π - p → π - π + n was made. Applying the model to combined data from several latoratories, we obtained a set of reasonable (but twofold ambiguous) values for the...
The complete gauge-invariant matrix element for the decays K ¯ 0 → π + l - ν ¯ γ ( l = e or μ ) is derived using the soft-photon theorems of Low and of Adler and Dothan. These theorems, along with several corollaries of them, are reviewed in detail and their application demonstrated by...
Results are presented on the properties of π N ( 980 ) , produced peripherally in the reaction K - + p → Y 1 * + ( 1385 ) + π N - ( 980 ) with a cross section of 9±3 μb at 5.5 GeV c . A search was made for π N ( 980 ) production via the decay of a higher-mass resonance. The cross section...
The decay rate of K 2 0 → γ γ is calculated by relating the amplitude for K 2 0 → γ γ to that for K → 3 π , where the Veneziano model is assumed for the latter.
The reactions p ¯ n → p ¯ n π + π - , p ¯ n → p ¯ p π - π 0 , and p ¯ n → n ¯ p π - π - at 2.8 - GeV c incident p ¯ laboratory momentum are analyzed with data from the Brookhaven National Laboratory 20-in. bubble chamber. N * ( 1238 ) isobar production in these channels is...
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