Freiburg 1999 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 31: Postersitzung / Theorie

HK 31.14: Poster

Wednesday, March 24, 1999, 10:15–12:00, Foyer

Pion polarizabilities in radiative pion photoproduction and pion capture — •C. Unkmeir¹, H.W. Fearing², and S. Scherer¹ — ¹Institut f"ur Kernphysik, Johannes Gutenberg-Universit"at, J.J. Becher Weg 45, 55099 Mainz — ²TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., Canada V6T 2A3

We calculate the invariant amplitudes of the reactions γ p → n γ π⁺ and π⁻p → nγγ within the framework of heavy baryon chiral perturbation theory (HBChPT) using the O(p³) Lagrangian of Ecker and Mojzis [1]. The sensitivity of observables of the above processes to the pion polarizabilities and the extrapolation to the pion pole are discussed [2].

[1] G. Ecker and M. Mojzis, Phys. Lett. B 365, 321 (1996)

[2] D. Drechsel and L.V. Fil’kov, Z. Phys. A 349, 177 (1994)