摘要We theoretically evaluate the decay rates of a scalar glueball up to the order O(αs), where only two Feynman diagrams contribute and a special attention is paid on possible flavour SU(3) symmetry breaking in the process. It is concluded that the SU(3) flavour symmetry may be respected in any case. However, due to chiral suppression in G0→qq, Γ(G0→qq qq) very likely is larger than Γ(G0→qq). These results are supported by the experimental data on the decays of χc0(1P) (0++). Based on this result, we propose a criterion to identify the scalar glueball.
Abstract：We theoretically evaluate the decay rates of a scalar glueball up to the order O(αs), where only two Feynman diagrams contribute and a special attention is paid on possible flavour SU(3) symmetry breaking in the process. It is concluded that the SU(3) flavour symmetry may be respected in any case. However, due to chiral suppression in G0→qq, Γ(G0→qq qq) very likely is larger than Γ(G0→qq). These results are supported by the experimental data on the decays of χc0(1P) (0++). Based on this result, we propose a criterion to identify the scalar glueball.
[1] Chanowitz M 2005 Phys. Rev. Lett. 95 172001 [2]Chao K T, He X G and Ma J P 2005 arXiv:hep-ph/0512327 Chao K T, He X G and Ma J P 2007 Phys. Rev. Lett. 98149103 [3]Sch\"afer T and Shuryak E V 1998 Rev. Mod. Phys. 70323 [4]Faccioli P and Shuryak E V 2001 Phys. Rev. D 64114020 [5]Chanowitz M 2007 hep-ph/0704.1616 [6]Chernyak V L and Zhitnitsky A R 1984 Phys. Rep. 112173 [7]Cao J, Huang T and Wu H F 1998 Phys. Rev. D 57 4154 [8]Gomshi Nobary M A and Javadi B 2005 Eur. Phys. J. C 42 37 and references therein [9]Yao W M et al (Particle Data Group) 2006 J. Phys. G 33 1 [10] Brodsky S J, Huang T and Lepage G P 1983 Particle andFields 2 ed Capri A Z and Kamal A N (New York: Plenum) p 143 Huang T 1980 Proceedings of XXth International Conference onHigh Energy Physics (Madison Wisconsin) ed Durand L and Pondron L G(New York: AIP) p 1000 [11]Huang T, Ma B Q and Shen Q X 1994 Phys. Rev. D 491490 [12]Huang T and Wu H F 2001 Commun. Theor. Phys. 36 573
2008, Vol. 25 
