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SUMMARY:Theoretical description of the spin structure function g1 at small
  x and arbitrary Q2
DTSTART;VALUE=DATE-TIME:20070417T132000Z
DTEND;VALUE=DATE-TIME:20070417T134000Z
DTSTAMP;VALUE=DATE-TIME:20130620T072356Z
UID:indico-contribution-148@cern.ch
DESCRIPTION:Speakers: ERMOLAEV\, Boris (Ioffe Physico-Technical Institute)
 \nStandard Approach (SA) for description of $g_1$ is based on the \nDGLAP 
 evolution equations and the special fits for the initial parton \ndensitie
 s. SA accounts for  the total resummation of logs of $Q2$  and \nlacks the
  total resummation of leading $ln(1/x)$. In order to meet the \nsmall -$x$
  experimental data\, SA includes phenomenological singular \nfactors in th
 e fits. They mimic the resummation of ln(1/x) and lead to \nthe steep rise
  of g_1 at small x . When the resummation is accounted \nfor\, the fits ca
 n be drastically simplified. \nThe further advantage of our approach lays 
 in analysis of DIS at small \nQ2. Indeed\, DGLAP cannot be applied to  the
  region of small Q2 \npresently studied by COMPASS collaboration. Contrary
  to it\, our approach \nworks in this kinematics and predicts a very week 
 x-dependence of g_1 \nat small Q2 even at very small values of x. Instead\
 , experimental \ninvestigation of the g_1 dependence on the invariant ener
 gy 2pq would \nextremely interesting because it allows one to estimate the
  impact of the \ngluon initial density.\n\nhttp://indico.cern.ch/contribut
 ionDisplay.py?contribId=148&sessionId=4&confId=9499
LOCATION:Holiday Inn Forum 6
URL:http://indico.cern.ch/contributionDisplay.py?contribId=148&sessionId=4
 &confId=9499
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