Exclusive electroproduction of two pions at HERA
High Energy Physics - Experiment
2015-06-03 v1
Abstract
The exclusive electroproduction of two pions in the mass range 0.4 < M{\pi}{\pi} < 2.5 GeV has been studied with the ZEUS detector at HERA using an integrated luminosity of 82 pb-1. The analysis was carried out in the kinematic range of 2 < Q2 < 80 GeV2, 32 < W < 180 GeV and |t| < 0.6 GeV2, where Q2 is the photon virtuality, W is the photon-proton centre-of-mass energy and t is the squared four-momentum transfer at the proton vertex. The two-pion invariant-mass distribution is interpreted in terms of the pion electromagnetic form factor, |F(M{\pi}{\pi})|, assuming that the studied mass range includes the contributions of the {\rho}, {\rho}' and {\rho}" vector-meson states. The masses and widths of the resonances were obtained and the Q2 dependence of the cross-section ratios {\sigma}({\rho}' \rightarrow {\pi}{\pi})/{\sigma}({\rho}) and {\sigma}({\rho}" \rightarrow {\pi}{\pi})/{\sigma}({\rho}) was extracted. The pion form factor obtained in the present analysis is compared to that obtained in e+e- \rightarrow {\pi}+{\pi}-.
Keywords
Cite
@article{arxiv.1111.4905,
title = {Exclusive electroproduction of two pions at HERA},
author = {ZEUS collaboration and H. Abramowicz and I. Abt and L. Adamczyk and M. Adamus and R. Aggarwal and S. Antonelli and P. Antonioli and A. Antonov and M. Arneodo and D. Ashery and V. Aushev and Y. Aushev and O. Bachynska and A. Bamberger and A. N. Barakbaev and G. Barbagli and G. Bari and F. Barreiro and N. Bartosik and D. Bartsch and M. Basile and O. Behnke and J. Behr and U. Behrens and L. Bellagamba and A. Bertolin and S. Bhadra and M. Bindi and C. Blohm and V. Bokhonov and T. Bołd and K. Bondarenko and E. G. Boos and K. Borras and D. Boscherini and D. Bot and I. Brock and E. Brownson and R. Brugnera and N. Brümmer and A. Bruni and G. Bruni and B. Brzozowska and P. J. Bussey and B. Bylsma and A. Caldwell and M. Capua and R. Carlin and C. D. Catterall and S. Chekanov and J. Chwastowski and J. Ciborowski and R. Ciesielski and L. Cifarelli and F. Cindolo and A. Contin and A. M. Cooper-Sarkar and N. Coppola and M. Corradi and F. Corriveau and M. Costa and G. D'Agostini and F. Dal Corso and J. del Peso and R. K. Dementiev and S. De Pasquale and M. Derrick and R. C. E. Devenish and D. Dobur and B. A. Dolgoshein and G. Dolinska and A. T. Doyle and V. Drugakov and L. S. Durkin and S. Dusini and Y. Eisenberg and P. F. Ermolov and A. Eskreys and S. Fang and S. Fazio and J. Ferrando and M. I. Ferrero and J. Figiel and M. Forrest and B. Foster and G. Gach and A. Galas and E. Gallo and A. Garfagnini and A. Geiser and I. Gialas and L. K. Gladilin and D. Gladkov and C. Glasman and O. Gogota and Yu. A. Golubkov and P. Göttlicher and I. Grabowska-Bołd and J. Grebenyuk and I. Gregor and G. Grigorescu and G. Grzelak and O. Gueta and E. Gurvich and M. Guzik and C. Gwenlan and T. Haas and W. Hain and R. Hamatsu and J. C. Hart and H. Hartmann and G. Hartner and E. Hilger and D. Hochman and R. Hori and K. Horton and A. Hüttmann and Z. A. Ibrahim and Y. Iga and R. Ingbir and M. Ishitsuka and H. -P. Jakob and F. Januschek and T. W. Jones and M. Jüngst and I. Kadenko and B. Kahle and S. Kananov and T. Kanno and U. Karshon and F. Karstens and I. I. Katkov and M. Kaur and P. Kaur and A. Keramidas and L. A. Khein and J. Y. Kim and D. Kisielewska and S. Kitamura and R. Klanner and U. Klein and E. Koffeman and P. Kooijman and Ie. Korol and I. A. Korzhavina and A. Kotański and U. Kötz and H. Kowalski and O. Kuprash and M. Kuze and A. Lee and B. B. Levchenko and A. Levy and V. Libov and S. Limentani and T. Y. Ling and M. Lisovyi and E. Lobodzinska and W. Lohmann and B. Löhr and E. Lohrmann and K. R. Long and A. Longhin and D. Lontkovskyi and O. Yu. Lukina and J. Maeda and S. Magill and I. Makarenko and J. Malka and R. Mankel and A. Margotti and G. Marini and J. F. Martin and A. Mastroberardino and M. C. K. Mattingly and I. -A. Melzer-Pellmann and S. Mergelmeyer and S. Miglioranzi and F. Mohamad Idris and V. Monaco and A. Montanari and J. D. Morris and K. Mujkic and B. Musgrave and K. Nagano and T. Namsoo and R. Nania and A. Nigro and Y. Ning and T. Nobe and U. Noor and D. Notz and R. J. Nowak and A. E. Nuncio-Quiroz and B. Y. Oh and N. Okazaki and K. Oliver and K. Olkiewicz and Yu. Onishchuk and K. Papageorgiu and A. Parenti and E. Paul and J. M. Pawlak and B. Pawlik and P. G. Pelfer and A. Pellegrino and W. Perlański and H. Perrey and K. Piotrzkowski and P. Pluciński and N. S. Pokrovskiy and A. Polini and A. S. Proskuryakov and M. Przybycień and A. Raval and D. D. Reeder and B. Reisert and Z. Ren and J. Repond and Y. D. Ri and A. Robertson and P. Roloff and I. Rubinsky and M. Ruspa and R. Sacchi and A. Salii and U. Samson and G. Sartorelli and A. A. Savin and D. H. Saxon and M. Schioppa and S. Schlenstedt and P. Schleper and W. B. Schmidke and U. Schneekloth and V. Schönberg and T. Schörner-Sadenius and J. Schwartz and F. Sciulli and L. M. Shcheglova and R. Shehzadi and S. Shimizu and I. Singh and I. O. Skillicorn and W. Słomiński and W. H. Smith and V. Sola and A. Solano and D. Son and V. Sosnovtsev and A. Spiridonov and H. Stadie and L. Stanco and A. Stern and T. P. Stewart and A. Stifutkin and P. Stopa and S. Suchkov and G. Susinno and L. Suszycki and J. Sztuk-Dambietz and D. Szuba and J. Szuba and A. D. Tapper and E. Tassi and J. Terrón and T. Theedt and H. Tiecke and K. Tokushuku and O. Tomalak and J. Tomaszewska and T. Tsurugai and M. Turcato and T. Tymieniecka and M. Vázquez and A. Verbytskyi and O. Viazlo and N. N. Vlasov and O. Volynets and R. Walczak and W. A. T. Wan Abdullah and J. J. Whitmore and L. Wiggers and M. Wing and M. Wlasenko and G. Wolf and H. Wolfe and K. Wrona and A. G. Yagües-Molina and S. Yamada and Y. Yamazaki and R. Yoshida and C. Youngman and A. F. Żarnecki and L. Zawiejski and O. Zenaiev and W. Zeuner and B. O. Zhautykov and N. Zhmak and C. Zhou and A. Zichichi and Z. Zolkapli and M. Zolko and D. S. Zotkin},
journal= {arXiv preprint arXiv:1111.4905},
year = {2015}
}
Comments
24 pages, including 11 figures