A next-to-leading order fit to HERA diffractive DIS data that includes a fitted 1/Q^2 higher-twist term improves chi2/dof from 1.052 to 1.013 and changes the extracted gluon density, though the effect is not shown to be statistically robust.
Diffractive parton distributions from the analysis with higher twist
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abstract
Diffractive parton distributions of the proton are determined from fits to diffractive data from HERA. In addition to the twist--2 contribution, the twist--4 contribution from longitudinally polarised virtual photons is considered, which is important in the region of small diffractive masses. A new prediction for the longitudinal diffractive structure function is presented which differs significantly from that obtained in the pure twist--2 analyses.
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Role of higher twist effects in diffractive DIS and determination of diffractive parton distribution functions
A next-to-leading order fit to HERA diffractive DIS data that includes a fitted 1/Q^2 higher-twist term improves chi2/dof from 1.052 to 1.013 and changes the extracted gluon density, though the effect is not shown to be statistically robust.