- th / 0 20 70 40 v 1 1 5 Ju l 2 00 2 New parameterization of the trinucleon wavefunction and its application to the π 3 He scattering length

- th / 0 20 70 40 v 2 1 5 Ja n 20 03 New parameterization of the trinucleon wavefunction and its application to the π 3 He scattering length

We present a new parameterization of the trinucleon wavefunction. As a novel feature a separable parameterization for the complete wavefunction is given. In this way any calculation that considers two-body currents only is largely simplified. To demonstrate this we calculate the π 3He scattering length in chiral perturbation theory. We find reasonable agreement with experimental values inferred...

ar X iv : n uc l - th / 0 50 70 24 v 1 8 J ul 2 00 5 Low - energy η N interactions : scattering lengths and resonance parameters

We consider the impact of two recent π − p → ηn measurements on the ηN scattering length and ηN branching fractions for the N (1535) and N (1520) resonances within a coupled-channel analysis of πN elastic scattering and ηN production data. The sensitivity of these results to model input is also explored.

ar X iv : n uc l - th / 0 11 20 08 v 2 1 5 Ju l 2 00 2 Theoretical Study of the 3 He ( μ − , ν μ ) 3 H Capture

v 2 1 5 O ct 1 99 8 Elastic Scattering of Pions From the Three - nucleon System

We examine the scattering of charged pions from the trinucleon system at a pion energy of 180 MeV. The motivation for this study is the structure seen in the experimental angular distribution of back-angle scattering for π +-3 He and π −-3 H but for neither π −-3 He nor π +-3 H. We consider the addition of a double spin flip term to an optical model treatment and find that, though the contribut...

ar X iv : 0 70 7 . 40 06 v 1 [ he p - th ] 2 6 Ju l 2 00 7 Two - loop Gell - Mann – Low function of N = 1 supersymmetric

Two-loop Gell-Mann–Low function of N=1 supersymmetric Yang-Mills theory, regularized by higher covariant derivatives. Abstract Two-loop Gell-Mann–Low function is calculated for N=1 supersymmetric Yang– Mills theory, regularized by higher covariant derivatives. The integrals, which define it, are shown to be reduced to total derivatives and can be easily calculated analytically .