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SUMMARY:Double-Logarithmic Small-x Evolution for T-Odd Weizsäcker-William
 s TMDs
DTSTART:20260529T070000Z
DTEND:20260529T080000Z
DTSTAMP:20260627T171000Z
UID:indico-event-18201@indico.global
DESCRIPTION:Speakers: Yossathorn Tawabutr (Chulalongkorn University)\n\nAt
  small Bjorken x\, we study the gluon Weizsäcker-Williams (WW) transverse
 -momentum-dependent parton distribution functions (TMDs) that are odd unde
 r time reversal. Specifically\, this includes the Sivers function\, $f_{1T
 }^{\\perp}$\, the linearly polarized gluon\, $h_{1T}$\, and the gluonic pr
 etzelosity\, $h_{1T}^{\\perp}$. Their operator definitions can be expanded
  in powers of Bjorken x\, whose first non-vanishing terms yield a trace of
  fundamental Wilson lines decorated by sub-eikonal insertions. These trace
 s form sub-eikonal dipole amplitudes that contain small-x evolution resumm
 ing double logarithms\, $\\alpha_s\\ln^2(1/x)$. The evolution equations be
 come closed upon taking the large-$N_c$ limit\, allowing us to determine t
 hat they scale asymptotically at small Bjorken $x$ with $x^{-2.9\\sqrt{\\a
 lpha_sN_c/4\\pi}}$. Despite the power-law growth\, these asymptotic behavi
 ors are suppressed by a power of $x$ due to the sub-eikonal nature of the 
 WW TMDs\, in contrast to the small-x asymptotic behavior of T-odd dipole g
 luon TMDs that contain eikonal contributions driven mainly by the spin-de
 pendent odderon.\n\nhttps://indico.global/event/18201/
URL:https://indico.global/event/18201/
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