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SUMMARY:Are Jets Narrowed or Broadened in e+A SIDIS?
DTSTART;VALUE=DATE-TIME:20220322T163000Z
DTEND;VALUE=DATE-TIME:20220322T164500Z
DTSTAMP;VALUE=DATE-TIME:20260611T012338Z
UID:indico-contribution-2270@indico.tlabs.ac.za
DESCRIPTION:Speakers: Will Horowitz (University of Cape Town)\nWe compute 
 the in-medium jet broadening to leading order in energy in the opacity exp
 ansion. At leading order in $\\alpha_s$ the elastic energy loss gives a je
 t broadening that grows with $\\ln E$. The next-to-leading order in $\\alp
 ha_s$ result is a jet narrowing\, due to destructive LPM interference effe
 cts\, that grows with $\\ln^2 E$. We find that in the opacity expansion th
 e jet broadening asymptotics are---unlike for the mean energy loss---extre
 mely sensitive to the correct treatment of the finite kinematics of the pr
 oblem\; integrating over all emitted gluon transverse momenta leads to a p
 rediction of jet broadening rather than narrowing. We compare the asymptot
 ics from the opacity expansion to a recent twist-4 derivation and find a q
 ualitative disagreement: the twist-4 derivation predicts a jet broadening 
 rather than a narrowing. Comparison with current jet measurements cannot d
 istinguish between the broadening or narrowing predictions. We comment on 
 the origin of the difference between the opacity expansion and twist-4 res
 ults.\n\nhttps://indico.tlabs.ac.za/event/109/contributions/2270/
LOCATION:
URL:https://indico.tlabs.ac.za/event/109/contributions/2270/
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