The Large Nc Baryon-Meson It = Jt Rule Holds for Three Flavors
Abstract
It has long been known that nonstrange baryon-meson scattering in the 1/Nc expansion of QCD greatly simplifies when expressed in terms of t-channel exchanges: The leading-order amplitudes satisfy the selection rule It = Jt. We show that It = Jt, as well as Yt = 0, also hold for the leading amplitudes when the baryon and/or meson contain strange quarks, and also characterize their 1/Nc corrections, thus opening a new front in the phenomenological study of baryon-meson scattering and baryon resonances.
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