IHEP OpenIR  > 理论物理室
Meson mass decomposition from lattice QCD
xQCD Collaboration
2015
发表期刊PHYSICAL REVIEW D
卷号91期号:7页码:74516
摘要Hadron masses can be decomposed as a sum of quark and glue components that are defined through hadronic matrix elements of QCD operators. The components consist of the quark mass term, the quark energy term, the glue energy term, and the trace anomaly term. We calculate these components for mesons with lattice QCD for the first time. The calculation is carried out with overlap fermion on 2 + 1 flavor domain-wall fermion gauge configurations. We confirm that similar to 50% of the light pion mass comes from the quark mass term and similar to 10% comes from the quark energy; whereas, for the rho meson, the quark energy contributes roughly half of its mass but the quark mass term contributes little. The combined glue components contribute similar to 40-50% for both mesons. It is interesting to observe that the quark mass contribution to the mass of the vector meson is almost linear in quark mass over a large quark mass region below the charm quark mass. For heavy mesons, the quark mass term dominates the masses, while the contribution from the glue components is about 200 MeV (a bare value around 2 GeV) for the heavy pseudoscalar and vector mesons. The charmonium hyperfine splitting is found to be dominated by the quark energy term which is consistent with the picture of the quark potential model.
文章类型Article
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.91.074516
收录类别SCI ; CA
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000353545500004
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228290
专题理论物理室
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xQCD Collaboration. Meson mass decomposition from lattice QCD[J]. PHYSICAL REVIEW D,2015,91(7):74516.
APA xQCD Collaboration.(2015).Meson mass decomposition from lattice QCD.PHYSICAL REVIEW D,91(7),74516.
MLA xQCD Collaboration."Meson mass decomposition from lattice QCD".PHYSICAL REVIEW D 91.7(2015):74516.
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