https://doi.org/10.1140/epja/i2007-10506-3
Regular Article - Theoretical Physics
Properties of the πη,
,σ, f0(980) and a0(980) mesons and their relevance for the polarizabilities of the nucleon
Zweites Physikalisches Institut der Universität Göttingen, Friedrich-Hund-Platz 1, D-37077, Göttingen, Germany
* e-mail: mschuma3@gwdg.de
Received:
10
August
2007
Accepted:
4
December
2007
Published online:
18
December
2007
The signs and values of the two-photon couplings F Mγγ of mesons (M) and their couplings gMNN to the nucleon as entering into the t -channel parts of the difference of the electromagnetic polarizabilities (α - β) and the backward angle spin polarizabilities γπ are determined. The excellent agreement achieved with the experimental polarizabilities of the proton makes it possible to make reliable predictions for the neutron. The results obtained are αn = 13.4±1.0 , βn = 1.8±1.0 (10-4fm^3), and γ(n) π = 57.6±1.8 (10-4fm^4). New empirical information on the flavor wave functions of the f 0(980) - and the a 0(980) -meson is obtained.
PACS: 11.55.Fv Dispersion relations – / 11.55.Hx Sum rules – / 13.60.Fz Elastic and Compton scattering – / 14.70.Bh Photons –
© Società Italiana di Fisica and Springer-Verlag, 2008