TheRecent Results of(Pseudo-)ScalarMesons/GlueballsatBES2XU GuofaJ/y GroupIHEP,Beijing2026/9/17《全国第七届高能物理年会》
2026/9/17 《全国第七届高能物理年会》 1 The Recent Results of (Pseudo-)Scalar Mesons/Glueballs at BES2 XU Guofa J/ Group IHEP,Beijing
Introduction (1)Glueballs should be favored over ordinary mesons inthe central region of high energy scatteringprocesses, away from beam and target quarks. Thef.:(1710) and possibly the fo(1500) have been seen inthe central region in pp collisionsGlueballs should be produced in proton-antiprotonannihilation,where the destruction of quarks createsopportunity for gluons to be manifested. in whichdetailed decay systematics of fo(1500) have beenstudied. The n(1440) is clearly seen in ppbarannihilationGlueballs should be enhanced compared to ordinarymesons in radiativeequarkonium decay2026/9/17《全国第七届高能物理年会》
2026/9/17 《全国第七届高能物理年会》 2 Introduction (1) • Glueballs should be favored over ordinary mesons in the central region of high energy scattering processes, away from beam and target quarks. The fJ (1710) and possibly the f0 (1500) have been seen in the central region in pp collisions • Glueballs should be produced in proton-antiproton annihilation, where the destruction of quarks creates opportunity for gluons to be manifested. in which detailed decay systematics of f0 (1500) have been studied. The (1440) is clearly seen in ppbar annihilation • Glueballs should be enhanced compared to ordinary mesons in radiative quarkonium decay
Instroduction (2)Lattice QCD predicts that the lightest “ideal" (i.e.,quenched approximation) glueball will be O++, withstate-of-the-art mass predictions of ~1.6 GeVAmsler and Close have pointed out that the fo(1500)shares features expected for a glueball that is mixedwith the nearby isoscalar members of the 3P。qqbarnonet.If the f.(1710) proves to have J=2, then it is not acandidateforthe ground stateglueball and the fo(1500)will be essentially unchallenged. On the other hand, ifthe f.(1710) has J=0, it becomes a potentiallyinteresting glueball candidate(b(f0(1710)gg)0.52±0.07)0' Glueball ~2.1 GeV《全国第七届高能物理年会》2026/9/17
2026/9/17 《全国第七届高能物理年会》 3 Instroduction (2) • Lattice QCD predicts that the lightest ‘‘ideal’’ (i.e., quenched approximation) glueball will be 0 ++, with state-of-the-art mass predictions of ~1.6 GeV • Amsler and Close have pointed out that the f0 (1500) shares features expected for a glueball that is mixed with the nearby isoscalar members of the 3P0 qqbar nonet. • If the fJ (1710) proves to have J=2, then it is not a candidate for the ground state glueball and the f0 (1500) will be essentially unchallenged. On the other hand, if the fJ (1710) has J=0, it becomes a potentially interesting glueball candidate (b(f0(1710) gg) 0.52±0.07 ) • 0 - Glueball ~2.1 GeV
studyingJ/y→0元元J /y→K*K元andKK元元study k in0++> study fo(980), fo(1370), fo(1500), fo(1710) andf0(1790) inJ / y →{y,0,Φ+, KK2026/9/17《全国第七届高能物理年会》4
2026/9/17 《全国第七届高能物理年会》 4 ➢ study in study in ➢ study f0 (980), f0 (1370), f0 (1500), f0 (1710) and f0(1790) in → + − J / J / K K and KK → * J / →，， + , KK 0 ++
· 58M J/y Samples at BESII PWA of J/y → 元元(hep-ex/0603048)Thethreshold enhancement inJ/(PRL96(2006)162002)Study of J/(PRD73(2006)112007)52026/9/17《全国第七届高能物理年会》
2026/9/17 《全国第七届高能物理年会》 5 • 58M J/ Samples at BESII • PWA of J/ → (hep-ex/0603048) • The threshold enhancement in J/ (PRL96(2006)162002) • Study of J/ (PRD73(2006)112007)