Second Moment of the Pion Light-cone Distribution Amplitude from Lattice QCD
Second Moment of the Pion Light-cone Distribution Amplitude from Lattice QCD
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DOI:
10.1103/physrevd.92.014504
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发表时间:
2015-03
影响因子:
5
通讯作者:
V. Braun;Sinéad Collins;M. Göckeler;P. Pérez-Rubio;A. Schäfer;R. Schiel;A. Sternbeck
中科院分区:
文献类型:
--
作者:
V. Braun;Sinéad Collins;M. Göckeler;P. Pérez-Rubio;A. Schäfer;R. Schiel;A. Sternbeck
We present the results of a lattice study of the second moment of the light-cone pion distribution amplitude using two flavors of dynamical (clover) fermions on lattices of different volumes and pion masses down to $m_\pi\sim 150 \, \mathrm {MeV}$. At lattice spacings between $0.06 \, \mathrm {fm}$ and $0.08 \, \mathrm {fm}$ we find for the second Gegenbauer moment the value $a_2 = 0.1364(154)(145)$ at the scale $\mu=2 \, \mathrm {GeV}$ in the $\overline{\mathrm{MS}}$ scheme, where the first error is statistical including the uncertainty of the chiral extrapolation, and the second error is the estimated uncertainty coming from the nonperturbatively determined renormalization factors.