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Q2 dependence of nuclear transparency for exclusive rho0 production |
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| Authors: | Airapetian A Akopov N Akopov Z Amarian M Ammosov V V Andrus A Aschenauer E C Augustyniak W Avakian R Avetissian A Avetissian E Bailey P Baturin V Baumgarten C Beckmann M Belostotski S Bernreuther S Bianchi N Blok H P Böttcher H Borissov A Bouwhuis M Brack J Brüll A Brunn I Capitani G P Chiang H C Ciullo G Contalbrigo M Court G R Dalpiaz P F De Leo R De Nardo L De Sanctis E Devitsin E Di Nezza P Düren M Ehrenfried M Elalaoui-Moulay A Elbakian G Ellinghaus F Elschenbroich U Ely J Fabbri R Fantoni A Fechtchenko A Felawka L Fox B Franz J Frullani S Gärber Y Gapienko G Gapienko V Garibaldi F |
| Affiliation: | Yerevan Physics Institute, Armenia. |
| Abstract: | Exclusive coherent and incoherent electroproduction of the rho(0) meson from 1H and 14N targets has been studied at the HERMES experiment as a function of coherence length (l(c)), corresponding to the lifetime of hadronic fluctuations of the virtual photon, and squared four-momentum of the virtual photon (-Q2). The ratio of 14N to 1H cross sections per nucleon, called nuclear transparency, was found to increase (decrease) with increasing l(c) for coherent (incoherent) rho(0) electroproduction. For fixed l(c), a rise of nuclear transparency with Q2 is observed for both coherent and incoherent rho(0) production, which is in agreement with theoretical calculations of color transparency. |
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