Speaker
Marcin Guzik
Description
The exclusive production of dijets in diffractive deep inelastic lepton-proton scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 372 pb$^{-1}$ of $e^\pm p$ data. The measurement has been performed in the kinematic range $Q^2 > 25\,\mathrm{GeV}^2$, $90 < W < 250\,\mathrm{GeV}$ and $x_{\rm I\!P} < 0.01$, where $Q^2$ is the virtuality of exchanged photon, $W$ is the $\gamma^\star p$ centre-of-mass energy and $x_{\rm I\!P}$ is the fraction of the proton momentum taken by the diffractive exchange. Jets have been reconstructed in the photon-Pomeron ($\gamma^\star -{\rm I\!P}$ ) centre-of-mass system frame using the exclusive $k_T$ algorithm. The cross section for the exclusive production of dijets is given as a function of the angle between the plane defined by exchanged photon and dijet system and the plane defined by the incoming and scattered lepton momenta in the $\gamma^*-{\rm I\!P}$ rest frame. It is compared to theoretical predictions of models based on boson-gluon fusion and two-gluon exchange processes.
Primary author
Matthew Wing
(UCL)
