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SUMMARY:Gradient-Flow Renormalization of Nonlocal Quasi Operators in Latti
 ce QCD
DTSTART;VALUE=DATE-TIME:20261011T072500Z
DTEND;VALUE=DATE-TIME:20261011T074000Z
DTSTAMP;VALUE=DATE-TIME:20261005T083316Z
UID:indico-contribution-2847@indico.itp.ac.cn
DESCRIPTION:Speakers: 俊元 黄 ()\nLarge-momentum effective theory (LaME
 T) enables first-principles studies of hadron structure from spatially non
 local quasi observables\, for which renormalization is essential to connec
 t lattice calculations to continuum perturbative schemes. While the renorm
 alization of local operators has been extensively studied using methods su
 ch as RI/MOM and gradient flow\, nonlocal quasi operators containing space
 -like Wilson lines involve additional linear divergences and require dedic
 ated renormalization strategies. Conventional self-renormalization can pro
 perly remove these divergences\, but in practice the extraction of lattice
 -spacing-dependent renormalization factors is entangled with discretizatio
 n effects and typically relies on simultaneous analyses at multiple lattic
 e spacings. In this work\, we develop a gradient-flow-based renormalizatio
 n strategy for nonlocal quasi operators. The flow-dependent Wilson-line se
 lf energy is extracted from gauge-fixed Wilson lines and then applied as a
  common long-distance renormalization factor for different quasi matrix el
 ements. After subtracting the linear divergence\, the flowed operators are
  perturbatively matched to the \\(\\overline{\\mathrm{MS}}\\) scheme\, the
 reby separating the Wilson-line self-energy subtraction from the remaining
  lattice-spacing dependence. Gradient flow also improves the long-distance
  signal of Wilson-line observables while retaining a controlled field-theo
 retic interpretation. We implement the procedure on two CLQCD ensembles wi
 th different lattice spacings. The extracted self-energy correction shows 
 mild lattice-spacing dependence and yields well-behaved renormalized quasi
  matrix elements at large separations.\n\nhttps://indico.itp.ac.cn/event/4
 37/contributions/2847/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2847/
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