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SUMMARY:Full NLO corrections for DIS structure functions in the dipole fac
 torization formalism
DTSTART;VALUE=DATE-TIME:20160524T151000Z
DTEND;VALUE=DATE-TIME:20160524T153000Z
DTSTAMP;VALUE=DATE-TIME:20190325T154737Z
UID:indico-contribution-1978364@indico.cern.ch
DESCRIPTION:Speakers: Guillaume Beuf (ECT* Trento)\nDeep Inelastic Scatter
 ing (DIS) is the cleanest tool available\n to probe the content of a fast 
 proton or nucleus. In the regime\n of low Bjorken x\, one enters in the no
 nlinear regime of gluon\n saturation\, where the gluons are better describ
 ed as a strong\n coherent semi-classical field than as a collection of qua
 si\non-shell partons. Hence\, that regime lies outside the validity\n rang
 e of the collinear factorization\, and is better described \nwithin the di
 pole factorization of DIS observables which allows \nto resum coherent mul
 tiple scattering on the target\, and also \nto resum the high-energy leadi
 ng logarithms (LL).\nOne of the motivations to study in detail the regime 
 of gluon \nsaturation in proton and nuclei is that it drives the physics \
 nof the earliest stages of heavy collisions\, up to the formation \nof the
  Quark-Gluon Plasma.\n\nSo far\, phenomenological studies have been perfor
 med successfully\n at LO in the dipole factorization\, with LL resummation
 \,\n using HERA data for proton DIS. However\, in order to reach \nprecisi
 on\, NLO corrections should be included\, as well as\nhigh-energy NLL resu
 mmations. This is important not only to extract \nas much knowledge as pos
 sible out of the HERA data\, but also in\nprevision of future electron-pro
 ton and/or electron-nucleus colliders.  \n\nIn this talk\, I will present 
 an update on the calculation of the \n(fixed order) NLO corrections to DIS
  structure functions on a dense \ntarget in the dipole factorization pictu
 re. In earlier studies\, only \none part of the NLO corrections has been c
 alculated\, the one \ncorresponding to a quark-antiquark-gluon Fock state 
 interacting with\nthe target. By contrast\, I will present the first direc
 t calculation of \nthe other part of NLO corrections\, for which a quark-a
 ntiquark Fock \nstate interacts with the target. I will also discuss issue
 s related \nwith the combination of the two pieces\, which is complicated 
 by the \npresence of UV divergences. Along the way\, various techniques ha
 ve been \ndevelopped\, which will simplify the calculation of NLO correcti
 ons\nto most other observables relevant for gluon saturation.\n\nhttps://i
 ndico.cern.ch/event/469857/contributions/1978364/
LOCATION:Centro de Congressos\, Instituto Superior Técnico\, Alameda Camp
 us Room 02.2
URL:https://indico.cern.ch/event/469857/contributions/1978364/
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