Leptonic Decay Constant of $\rho$ at Physical Point

分类： 物理学 >> 核物理学 提交时间： 2016-09-14

Ying Chen Andrei Alexandru Terrence Draper Keh-Fei Liu Zhaofeng Liu Yi-Bo Yang

摘要： The ρ meson leptonic decay constant at the physical pion mass is calculated with chiral fermions. Overlap valence quarks are used on the L3×T=483×96 Nf=2+1 domain-wall fermion configurations with light sea quarks at the physical point and the spatial extension of 5.5 fm. The mass of the vector meson ρ is determined to be mρ=775.9±6.0±1.8 MeV, and the valence πρ sigma term is extracted to be σ(val)πρ=9.82(6) MeV from Feynmann-Hellman theorem. By adopting a new method to reduce the noise of the wall-wall correlation functions of hadrons, we obtain the ρ leptonic decay constant fρ=208.5±5.5±0.9 MeV, which is in very good agreement with the experimental value fρ=209.4±1.5 MeV derived from the τ decay τ→ρντ.

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