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Rapidity Gaps Between Jets in Photoproduction at HERA |
| Reference |
Angela Clare Wyatt, talk presented at DIS 2000, April 2000 |
| Document |
Conference paper
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| Contact |
B.Cox |
| Abstract |
Dijet events in photon-proton collisions in which there is a rapidity separation between the two highest E_t jets \Delta ta >2.0 are studied with the H1 detector at HERA. Jets are defined using the inclusive KT algorithm. Rapidity gap events are defined as events in which the sum of the transverse energy of all jets between the two highest E_t jet axes is less than E_t^{cut} GeV, for 0.5 < E_t^{cut} < 5.0$ GeV. The gap fraction, defined as the fraction of dijet events with a rapidity gap, is plotted for different $E_t^{cut}$ values for the inclusive dijet sample, and differentially in $\Delta ta$, $x_p^{j ets}$, the fraction of the protons momentum entering the hard scattering and $x_{\gamma}^{jets}$, the fraction of the photon s momentum entering the hard scatter . A large excess of events with rapidity gaps at low values of $E_t^{cut}$ is observed above the expectation from standard photoproduction processes. The excess is consistent with the expectation, within the lead ing logarithmic approximation of BFKL, if high-$t$ pomeron exchange is included. |
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