SU(6)W and decays of baryon resonances

Negative parity 70-plet baryon masses in the1/Ncexpansion

“…Fortunately, the experimental data available in the case of the 70-plet is enough to obtain them by performing a fit [11]. The inputs to the fit consist of seventeen masses of negative parity baryons which have been assigned a status of three or more stars by the Particle Data Group [36], and the two leading order mixing angles θ 1 = 0.61 ± 0.09 and θ 3 = 3.04 ± 0.15 on which there is a rather good consensus about their values as obtained from strong decays of the non-strange members of the multiplet [7,31,44]. Note that θ 3 is consistent with zero mod π.…”

Intersections 2000: What's New in Hadron Physics

“…For me, a high point of hadron spectroscopy occurred in the mid 1970s with the very sophisticated measurements and analyses of baryon resonance spectra. An enormous body of work could be summarized by the SU(6) classification "56, L even; 70, L odd", very consistent with a quark-diquark picture of baryon structure [6]. I am not sure how well this picture has survived the subsequent 25 years.…”

1/Nccorrections to theSU(4)cPirjol1, Schat2 2003Phys. Rev. D738690View full textAdd to dashboardCite

“…In the quark model, the L = 1 negative parity baryons fall into the 70 representation of SU (6), which contains the (1, 2), (10,2), (8,2) and (8,4) of SU(3) fl ⊗ SU(2) sp [1,2]. The finer details of the spectrum were first studied in a constituent quark model by Isgur and Karl [3,4].…”