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SUMMARY:Control of Excited-State Contamination in Nucleon Matrix Elements 
 Using All-to-All Fermion Propagators
DTSTART;VALUE=DATE-TIME:20261010T082500Z
DTEND;VALUE=DATE-TIME:20261010T084500Z
DTSTAMP;VALUE=DATE-TIME:20261005T122446Z
UID:indico-contribution-2858@indico.itp.ac.cn
DESCRIPTION:Speakers: 志成 胡 (ITP)\nWe present a method to decompose a
 nd control excited-state contamination in nucleon matrix elements using al
 l-to-all fermion propagators. By constructing a variational basis of nucle
 on and nucleon–meson interpolating operators\, we resolve the contributi
 ons of the nucleon ground state and low-lying multi-hadron states. In part
 icular\, we investigate excited states containing ($N\\pi$)\, ($N\\pi\\pi$
 )\, and meson-related scattering components such as ($Nf_1$). The generali
 zed eigenvalue problem is applied to the two-point correlation matrix to d
 etermine optimized operators\, which are then used to rotate the three-poi
 nt functions and reduce transitions involving excited states. This framewo
 rk allows the excited-state contributions to be studied separately instead
  of being absorbed into an uncontrolled systematic uncertainty. We focus o
 n the scalar and axial charges\, ($g_S$)\, ($g_A$)\, for which excited-sta
 te effects can have different magnitudes and time dependence. The method p
 rovides a systematic approach to improving the reliability of nucleon stru
 cture calculations and to quantifying the residual excited-state contamina
 tion.\n\nhttps://indico.itp.ac.cn/event/437/contributions/2858/
LOCATION:会议楼2 CXII103
URL:https://indico.itp.ac.cn/event/437/contributions/2858/
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