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The radiative decay of scalar glueball from lattice QCD

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The radiative decay of scalar glueball from lattice QCD
We perform the first lattice QCD study on the radiative decay of the scalar glueball to the vector meson φ in the quenched ap-proximation.The calculations are carried out on three gauge ensembles with different lattice spacings,which enable us to do the continuum extrapolation.We first revisit the radiative J/Ψ decay into the scalar glueball G and obtain the partial decay widthΓ(J/Ψ→ γG)=0.578(86)keV and the branching fraction Br(J/Ψ → yG)=6.2(9)x 10-3,which are in agreement with the previous lattice results.We then extend the similar calculation to the process G → γφ and get the partial decay widthΓ(G → γφ)=0.074(47)keV,which implies that the combined branching fraction of J/Ψ → yG → γγφ is as small as O(10-9)such that this process is hardly detected by the BESIII experiment even with the large J/Ψ sample of O(1010).With the vector meson dominance model,the two-photon decay width of the scalar glueball is estimated to be Γ(G → γγ)=0.53(46)eV,which results in a large stickiness S(G)～O(104)of the scalar glueball by assuming the stickiness off2(1270)to be one.

lattice QCDscalar glueballradiative decay

Jintao Zou、Long-Cheng Gui、Ying Chen、Wen Qin、Jian Liang、Xiangyu Jiang、Yibo Yang

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Department of Physics,Hunan Normal University and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,Changsha 410081,China

Synergetic Innovation Center for Quantum Effects and Applications(SICQEA),Hunan Normal University,Changsha 410081,China

Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

Key Laboratory of Atomic and Subatomic Structure and Quantum Control(MOE),Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter,Institute of Quantum Matter,South China Normal University,Guangzhou 510006,China

Guangdong-Hong Kong Joint Laboratory of Quantum Matter,Guangdong Provincial Key Laboratory of Nuclear Science,Southern Nuclear Science Computing Center,South China Normal University,Guangzhou 510006,China

CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China

School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

International Centre for Theoretical Physics Asia-Pacific,Beijing 100190,China

School of Fundamental Physics and Mathematical Sciences,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China

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lattice QCD scalar glueball radiative decay

2024

10.1007/s11433-024-2451-5

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(11)