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DVCS on HERA-II data |
| Reference |
Preliminary results expected for DIS'06, Spring 2006 |
| Figures |
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| Contact |
Benoit Rolland, Laurent Favart |
| Abstract |
A measurement is presented of elastic deeply virtual Compton
scattering $\gamma^* p
ightarrow \gamma p$ for HERA II data,
using $e^+ p$ collision data
corresponding to a luminosity of 40.3 pb$^{-1}$
and 100.8 pb$^{-1}$ of $e^- p$ data.
The cross section is measured as a function of the photon
virtuality, $Q^{\,2}$, the invariant mass of the
$\gamma-p$ system, $W$, and differentially in the
squared momentum transfer at the proton vertex, $t$, in the kinematic range
$6.5~<~Q^{\,2}~<~100\,{
m GeV}^2$, $30~<~W~<~140\,{
m GeV}$ and
$|t|~<~1\,{
m GeV}^2$.
These measurements are shown to be in agreement with previous HERA I
cross sections obtained with the H1 detector. The $W$ dependence is
extracted for two values of $Q^2$ and, for the first time, the skeewing
factor $R$ is extracted and its kinematic dependences are studied.
First studies of the charge asymetry are also shown. |
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