Precision determination of the pi N scattering lengths and the charged pi NN coupling constant

Authors
Ericson, TEO Loiseau, B Thomas, AW
Citation
Teo. Ericson et al., Precision determination of the pi N scattering lengths and the charged pi NN coupling constant, NUCL PHYS A, 663, 2000, pp. 541C-544C
Citations number
12
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS A
ISSN journal
03759474 → ACNP
Volume
663
Year of publication
2000
Pages
541C - 544C
Database
ISI
SICI code
0375-9474(20000131)663:<541C:PDOTPN>2.0.ZU;2-J
Abstract
We critically evaluate the isovector GMO sumrule for the charged pi NN coup ling constant using recent precision data from pi(-)p and pi(-)d atoms and with careful attention to systematic errors. From the pi(-)d scattering len gth we deduce the pion-proton scattering lengths 1/2(a(pi-p) + a(pi-n)) = ( -20 +/- 6(statistic)+/-10 (systematic))(-).10(-4)m(pi c)(-1) and 1/2(a(pi-p ) - a(pi-n)) = (903+/-14).10(-4)m(pi c)(-1). From this a direct evaluation gives g(c)(2)(GMO)/4 pi = 14.20 +/- 0.07(statistic)+/-0.13(systematic) or f (c)(2)/4 pi = 0.0786 +/- 0.0008.