Zero-contours in low-energy K-π scattering

Isospin Breaking Corrections to Low - Energy π − K Scattering

We evaluate the matrix elements for the processes π 0 K 0 → π 0 K 0 and π − K + → π 0 K 0 in the presence of isospin breaking terms at leading and next-to-leading order. As a direct application the relevant combination of the S-wave scattering lengths involved in the pion-kaon atom lifetime is determined. We discuss the sensitivity of the results with respect to the input parameters.

F - 13288 Marseille – Cedex 9 Electromagnetic Corrections to Low - Energy π − π Scattering †

Electromagnetic corrections to the low-energy π+π− → π0π0 scattering amplitude at next-to-leading order in the chiral expansion are reviewed. Their effects on the corresponding scattering lengths are estimated and compared to the two-loop strong interaction contributions. Key-Words: Chiral perturbation theory, Pion, Electromagnetic corrections. Contribution to the Eighth International Symposium...

Isospin Invariance and Generalized Bose Statistics applied to Low Energy K ± K o and π ± π o Space

The use of isospin invariance and Generalized Bose statistics shows that the BoseEinstein correlation (BEC) of identical bosons seen in the KK and ππ systems can be extended to apply to KK and ππ pairs when they are produced from an initial state with isospin zero; e.g. by the fragmentation of gluons or of a strange quark pair accompanied by gluons. This might be useful in constructing more rea...

First π K atom lifetime and π K scattering length measurements DIRAC

B. Adeva a, L. Afanasyev b, Y. Allkofer c, C. Amsler d, A. Anania e, S. Aogaki f, A. Benelli b, V. Brekhovskikh g, T. Cechak h, M. Chiba i, P. Chliapnikov g, C. Ciocarlan f, S. Constantinescu f, P. Doskarova h, D. Drijard j, A. Dudarev b, M. Duma f, D. Dumitriu f, D. Fluerasu f, A. Gorin g, O. Gorchakov b, K. Gritsay b, C. Guaraldo k, M. Gugiu f, M. Hansroul j, Z. Hons l, S. Horikawa c, Y. Iwas...

Results from NA 48 / 2 on ππ scattering lengths measurements in K ± → π + π − e ± ν and K ± → π 0 π 0 π ± decays