Tuesday, March 27, 2012

1203.5461 (L. Motyka et al.)

Evidence of strong higher twist effects in diffractive DIS at HERA at
moderate Q2
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L. Motyka, M. Sadzikowski, W. Slominski
We study a twist decomposition of diffractive structure functions in the diffractive deep inelastic scattering (DDIS) at HERA. At low Q2 and at large energy the data exhibit a strong excess, up to about 100%, above the twist 2 NLO DGLAP description. The excess in consistent with higher twist effects. It is found, that complementing the DGLAP fit by twist 4 and 6 components of the GBW saturation model leads to a good description of data at low Q2. We conclude that the DDIS at HERA provides the first, strong evidence of higher twist effects in DIS.
View original: http://arxiv.org/abs/1203.5461

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