26-30 March 2012
University of Bonn
Europe/Berlin timezone

The Recent F_L Measurement from HERA and the Dipole Model

27 Mar 2012, 17:00
20m
Wolfgang Paul Lecture Hall (University of Bonn)

Wolfgang Paul Lecture Hall

University of Bonn

Kreuzbergweg 28, 53115 Bonn, Germany,
Structure functions Structure functions

Speaker

Carlo Ewerz (ExtreMe Matter Institute EMMI, GSI, and Heidelberg University)

Description

From the new measurement of F_L at HERA we derive fixed-Q^2 averages <F_L/F_2>. We compare these with bounds which are rigorous in the framework of the standard dipole picture. The bounds are sharpened by including information on the charm structure function F_2^(c). Within the experimental errors the bounds are respected by the data. But for 3.5 GeV^2 <= Q^2 <= 20 GeV^2 the central values of the data are close to and in some cases even above the bounds. Data on F_L/F_2 significantly exceeding the bounds would rule out the standard dipole picture at these kinematic points. We discuss, furthermore, what can be learned from data respecting the bounds but coming close to them.

Primary author

Carlo Ewerz (ExtreMe Matter Institute EMMI, GSI, and Heidelberg University)

Presentation materials