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arXiv · 1505.05783

Production of exclusive dijets in diffractive deep inelastic scattering at HERA

ZEUS Collaboration·H. Abramowicz·I. Abt·L. Adamczyk·M. Adamus·S. Antonelli·V. Aushev·Y. Aushev·O. Behnke·U. Behrens·A. Bertolin·I. Bloch·E. G. Boos·K. Borras·I. Brock·N. H. Brook·R. Brugnera·A. Bruni·P. J. Bussey·A. Caldwell·M. Capua·C. D. Catterall·J. Chwastowski·J. Ciborowski·R. Ciesielski·A. M. Cooper-Sarkar·M. Corradi·F. Corriveau·R. K. Dementiev·R. C. E. Devenish·G. Dolinska·S. Dusini·J. Figiel·B. Foster·G. Gach·E. Gallo·A. Garfagnini·A. Geiser·A. Gizhko·L. K. Gladilin·Yu. A. Golubkov·J. Grebenyuk·I. Gregor·G. Grzelak·O. Gueta·M. Guzik·W. Hain·D. Hochman·R. Hori·Z. A. Ibrahim·Y. Iga·M. Ishitsuka·A. Iudin·F. Januschek·N. Z. Jomhari·I. Kadenko·S. Kananov·U. Karshon·M. Kaur·P. Kaur·D. Kisielewska·R. Klanner·U. Klein·N. Kondrashova·O. Kononenko·Ie. Korol·I. A. Korzhavina·A. Kotański·U. Kötz·N. Kovalchuk·H. Kowalski·B. Krupa·O. Kuprash·M. Kuze·B. B. Levchenko·A. Levy·V. Libov·S. Limentani·M. Lisovyi·E. Lobodzinska·B. Löhr·E. Lohrmann·A. Longhin·D. Lontkovskyi·O. Yu. Lukina·I. Makarenko·J. Malka·S. Mergelmeyer·F. Mohamad Idris·N. Mohammad Nasir·V. Myronenko·K. Nagano·T. Nobe·D. Notz·R. J. Nowak·Yu. Onishchuk·E. Paul·W. Perlański·N. S. Pokrovskiy·M. Przybycień
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Abstract

Production of exclusive dijets in diffractive deep inelastic $e^\pm p$ scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 372 pb$^{-1}$. The measurement was performed for $\gamma^*-p$ centre-of-mass energies in the range $90 < W < 250$ GeV and for photon virtualities $Q^2 > 25$ GeV$^2$. Energy and transverse-energy flows around the jet axis are presented. The cross section is presented as a function of $\beta$ and $\phi$, where $\beta=x/x_{\rm I\!P}$, $x$ is the Bjorken variable and $x_{\rm I\!P}$ is the proton fractional longitudinal momentum loss. The angle $\phi$ is defined by the $\gamma^*-$dijet plane and the $\gamma^*-e^\pm$ plane in the rest frame of the diffractive final state. The $\phi$ cross section is measured in bins of $\beta$. The results are compared to predictions from models based on different assumptions about the nature of the diffractive exchange.

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ZEUS Collaboration, H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, S. Antonelli, V. Aushev, Y. Aushev, O. Behnke, U. Behrens, A. Bertolin, I. Bloch, E. G. Boos, K. Borras, I. Brock, N. H. Brook, R. Brugnera, A. Bruni, P. J. Bussey, A. Caldwell, M. Capua, C. D. Catterall, J. Chwastowski, J. Ciborowski, R. Ciesielski, A. M. Cooper-Sarkar, M. Corradi, F. Corriveau, R. K. Dementiev, R. C. E. Devenish, G. Dolinska, S. Dusini, J. Figiel, B. Foster, G. Gach, E. Gallo, A. Garfagnini, A. Geiser, A. Gizhko, L. K. Gladilin, Yu. A. Golubkov, J. Grebenyuk, I. Gregor, G. Grzelak, O. Gueta, M. Guzik, W. Hain, D. Hochman, R. Hori, Z. A. Ibrahim, Y. Iga, M. Ishitsuka, A. Iudin, F. Januschek, N. Z. Jomhari, I. Kadenko, S. Kananov, U. Karshon, M. Kaur, P. Kaur, D. Kisielewska, R. Klanner, U. Klein, N. Kondrashova, O. Kononenko, Ie. Korol, I. A. Korzhavina, A. Kotański, U. Kötz, N. Kovalchuk, H. Kowalski, B. Krupa, O. Kuprash, M. Kuze, B. B. Levchenko, A. Levy, V. Libov, S. Limentani, M. Lisovyi, E. Lobodzinska, B. Löhr, E. Lohrmann, A. Longhin, D. Lontkovskyi, O. Yu. Lukina, I. Makarenko, J. Malka, S. Mergelmeyer, F. Mohamad Idris, N. Mohammad Nasir, V. Myronenko, K. Nagano, T. Nobe, D. Notz, R. J. Nowak, Yu. Onishchuk, E. Paul, W. Perlański, N. S. Pokrovskiy, M. Przybycień. 2015-05-21. Production of exclusive dijets in diffractive deep inelastic scattering at HERA. https://arxiv.org/abs/1505.05783

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