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On the Longitudinal Structure Function in the Dipole Model

M. Niedziela, M. Praszalowicz
2015 Acta Physica Polonica B  
We compare new HERA data for the longitudinal structure function $F_{\rm L}$ with the predictions of different variants of the dipole model. In particular we show that the ratio $F_{\rm L}/F_2$ is well described by the dipole models and is rather insensitive to the details of the fit. Fits to $F_2$ are performed with the help of geometrical scaling (GS). Using the property of GS we derive the bounds for $F_{\rm L}/F_2$ both for the different versions of the dipole model and in the general case.
more » ... n the general case. Finally we briefly discuss how the higher Fock components of the photon wave function may affect these bounds.
doi:10.5506/aphyspolb.46.2019 fatcat:67e4wyvnjjd3be33y7yxkalhau