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SUMMARY:High-Energy Limit of Mass-Suppressed Amplitudes in Gauge Theories 
 - Alexander Penin (University of Alberta)
DTSTART:20181130T160000Z
DTEND:20181130T170000Z
UID:TALK110473@talks.cam.ac.uk
CONTACT:Francesco Coradeschi
DESCRIPTION:We study the high-energy limit of the scattering amplitudes\ns
 uppressed by the leading power ofthe quark mass in perturbative QCD.\nWe p
 rove the factorization and perform all-order resummation of the\ndouble-lo
 garithmic radiative corrections which determine the\nasymptotic behavior o
 f the amplitudes. The structure of the\ncorrections and the asymptotic beh
 avior of the amplitudes in this case\ncrucially depend on the color flow i
 n a given process and are\ndetermined by the eikonal color charge nonconse
 rvation. We present\nexplicit results for the Higgs boson production in gl
 uon fusion\nmediated by a light-quark loop and for the leading power-suppr
 essed\ncontributions to the quark form factors\, which reveal “magical
 ”\nuniversality. Nontrivial relations between the asymptotic behavior of
 \ndifferent amplitudes and the amplitudes in different gauge theories\nare
  found.\n\nThe slides of the presentation can be found "here":http://www.h
 ep.phy.cam.ac.uk/~conference/Penin_30_11_2018.pdf
LOCATION:Ryle Seminar Room no. 930\, Rutherford Building\, Cavendish Labor
 atory
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