Scalar mesons and glueballs from CLAS

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Presentation transcript:

Scalar mesons and glueballs from CLAS f0  KS0 KS0 Clear coincidence KS0 KS0 There are 4 isoscalar states identified by experiment: f0(980), f0(1370), f0(1500) and f0(1710) There are only 2 slots for the f0 states in the quark model Mass(p2+ p2-) f0(1500) Mass(p1+ p1-) Result: The f0(1500) has a strong t-channel coupling to the photon, suggesting it does NOT have a significant glueball mixing. Lattice glueball mass

Double-KS0 Photoproduction at CLAS Ref: S. Chandavar et al. (CLAS) Phys. Rev. C 97, 025203 (2018). Reaction: g p  KS0 KS0 p  (p+ p-) (p+ p-) p Motivation: search for a f0 meson  KS0 KS0, which has definite CP = ++. The scalar mesons (f0) can mix with the JPC = 0++ glueball (lowest mass). The glueball has no charge, giving a weak coupling to the photon. CLAS data shows a clear peak for the f0(1500) with t-channel production. The paper shows f0(1500) for various cuts on Mandelstam variable t. Angular distributions are consistent with J=0 decay of f0  KS0 KS0. Result: The f0(1500) has strong photo-coupling, so it is likely to have small mixing with the glueball. Hence the f0(1710) is likely mixed with the lowest-mass glueball state (0++). Further data from CLAS12.