Nonlinear correction to the longitudinal structure function at small x |
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Authors: | G R Boroun |
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Institution: | 1.Physics Department,Razi University,Kermanshah,Iran |
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Abstract: | We computed the longitudinal proton structure function FL, using the nonlinear Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (NLDGLAP) evolution equation approach at small x . For the gluon distribution, the nonlinear effects are related to the longitudinal structure function. As the very small-x behavior of the gluon distribution is obtained by solving the Gribov, Levin, Ryskin, Mueller and Qiu (GLR-MQ) evolution equation
with the nonlinear shadowing term incorporated, we show that the strong rise that corresponds to the linear QCD evolution
equations can be tamed by screening effects. Consequently, the obtained longitudinal structure function shows a tamed growth
at small x . We computed the predictions for all details of the nonlinear longitudinal structure function in the kinematic range where
it has been measured by the H1 Collaboration and made comparisons with the computation by Moch, Vermaseren and Vogt at the
second order with input data from the MRST QCD fit. |
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