Tuesday, July 28, 2009, 3:30 pm — Small Seminar Room, Bldg. 510
HERA $ep$ collider provides unique information on the proton structure.
High center of mass energy $s=320$~GeV gives access to both the low Bjorken-$x$
domain and regime of high momentum transfers. Recently the H1 collaboration
reported a high precision measurement of the $F_2$ structure function at low $x$
leading to tight constraints on the sea quark and gluon densities.
Both the H1 and ZEUS collaborations measure the structure function $F_L$ which
provides an important cross check of the conventional QCD picture. This
measurement is recently extended by H1 to low $Q^2$ where small $x$
corrections play important role. An ultimate precision
of the deep inelastic scattering cross section measurement is achieved
by combining the measurements of the H1 and ZEUS collaborations.
The combined data are used as a sole input to a QCD fit to obtained
HERA PDF set. Implications of these results for the predictions at
the LHC are discussed.
Hosted by: Robert Pisarski
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