The B parameter beyond the leading order of the 1 N expansion

William A. Bardeen, A. J. Buras, J. M. Gerard

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

136 Zitate (Scopus)


We calculate the next-to-leading 1 N corrections to the B parameter which measures the size of the ΔS=2 matrix element 〈K0|(sd)V-A(sd)V-A|K0〉. These corections turn out to be small which assures the validity of the 1/N expansion. For ΛQCD=0.3GeV we find B=0.66±0.10 to be compared with the leading order value B=0.75. We clarify the differences between these results and the results of the usual chiral perturbative calculations which give |B|≈ 1 3 at the tree level but appear to signal the breakdown of chiral perturbation theory at the one-loop level.

Seiten (von - bis)343-349
FachzeitschriftPhysics Letters B
PublikationsstatusVeröffentlicht - 1 Sept. 1988
Extern publiziertJa


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