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Abstract
The exclusive electroproduction of two pions in the mass range 0.4<Mππ<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(Mππ)|, assuming that the studied mass range includes the contributions of the ρ, ρ′ and ρ′′ vector-meson states. The masses and widths of the resonances were obtained and the Q2 dependence of the cross-section ratios σ(ρ′→ππ)/σ(ρ) and σ(ρ′′→ππ)/σ(ρ) was extracted. The pion form factor obtained in the present analysis is compared to that obtained in e+e−→π+π−.
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Details
Title
Exclusive electroproduction of two pions at HERA
Author
Abramowicz, H 1 ; Abt, I 2 ; Adamczyk, L 3 ; Adamus, M 4 ; Aggarwal, R 5 ; Antonelli, S 6 ; Antonioli, P 7 ; Antonov, A 8 ; Arneodo, M 9 ; Ashery, D 1 ; Aushev, V 10 ; Aushev, Y 11 ; Bachynska, O 12 ; Bamberger, A 13 ; Barakbaev, A N 14 ; Barbagli, G 15 ; Bari, G 7 ; Barreiro, F 16 ; Bartosik, N 11 ; Bartsch, D 17 ; Basile, M 6 ; Behnke, O 12 ; Behr, J 12 ; Behrens, U 12 ; Bellagamba, L 7 ; Bertolin, A 18 ; Bhadra, S 19 ; Bindi, M 6 ; Blohm, C 12 ; Bokhonov, V 20 ; Bołd, T 3 ; Bondarenko, K 11 ; Boos, E G 14 ; Borras, K 12 ; Boscherini, D 7 ; Bot, D 12 ; Brock, I 17 ; Brownson, E 21 ; Brugnera, R 22 ; Brümmer, N 23 ; Bruni, A 7 ; Bruni, G 7 ; Brzozowska, B 24 ; Bussey, P J 25 ; Bylsma, B 23 ; Caldwell, A 2 ; Capua, M 26 ; Carlin, R 22 ; Catterall, C D 19 ; Chekanov, S 27 ; Chwastowski, J 28 ; Ciborowski, J 24 ; Ciesielski, R 12 ; Cifarelli, L 6 ; Cindolo, F 7 ; Contin, A 6 ; Cooper-Sarkar, A M 29 ; Coppola, N 12 ; Corradi, M 7 ; Corriveau, F 30 ; Costa, M 31 ; G D’Agostini 32 ; F Dal Corso 18 ; J del Peso 16 ; Dementiev, R K 33 ; De Pasquale, S 6 ; Derrick, M 27 ; Devenish, R C E 29 ; Dobur, D 13 ; Dolgoshein, B A 8 ; Dolinska, G 10 ; Doyle, A T 25 ; Drugakov, V 34 ; Durkin, L S 23 ; Dusini, S 18 ; Eisenberg, Y 35 ; Ermolov, P F 33 ; Eskreys, S 28 ; Fang, S 12 ; Fazio, S 26 ; Ferrando, J 29 ; Ferrero, M I 31 ; Figiel, J 28 ; Forrest, M 25 ; Foster, B 29 ; Gach, G 3 ; Galas, A 28 ; Gallo, E 15 ; Garfagnini, A 22 ; Geiser, A 12 ; Gialas, I 36 ; Gladilin, L K 33 ; Gladkov, D 8 ; Glasman, C 16 ; Gogota, O 10 ; Golubkov, Yu A 33 ; Göttlicher, P 12 ; Grabowska-Bołd, I 3 ; Grebenyuk, J 12 ; Gregor, I 12 ; Grigorescu, G 37 ; Grzelak, G 24 ; Gueta, O 1 ; Gurvich, E 1 ; Guzik, M 3 ; Gwenlan, C 29 ; Haas, T 12 ; Hain, W 12 ; Hamatsu, R 38 ; Hart, J C 39 ; Hartmann, H 17 ; Hartner, G 19 ; Hilger, E 17 ; Hochman, D 35 ; Hori, R 40 ; Horton, K 29 ; Hüttmann, A 12 ; Ibrahim, Z A 41 ; Iga, Y 42 ; Ingbir, R 1 ; Ishitsuka, M 43 ; H-P, Jakob 17 ; Januschek, F 12 ; Jones, T W 44 ; Jüngst, M 17 ; Kadenko, I 11 ; Kahle, B 12 ; Kananov, S 1 ; Kanno, T 43 ; Karshon, U 35 ; Karstens, F 13 ; Katkov, I I 12 ; Kaur, M 5 ; Kaur, P 5 ; Keramidas, A 37 ; Khein, L A 33 ; Kim, J Y 45 ; Kisielewska, D 3 ; Kitamura, S 38 ; Klanner, R 46 ; Klein, U 12 ; Koffeman, E 37 ; Kooijman, P 37 ; Korol, Ie 10 ; Korzhavina, I A 33 ; Kotański, A 47 ; Kötz, U 12 ; Kowalski, H 12 ; Kuprash, O 12 ; Kuze, M 43 ; Lee, A 23 ; Levchenko, B B 33 ; Levy, A 1 ; Libov, V 12 ; Limentani, S 22 ; Ling, T Y 23 ; Lisovyi, M 12 ; Lobodzinska, E 12 ; Lohmann, W 34 ; Löhr, B 12 ; Lohrmann, E 46 ; Long, K R 48 ; Longhin, A 18 ; Lontkovskyi, D 12 ; O Yu Lukina 33 ; Maeda, J 43 ; Magill, S 27 ; Makarenko, I 12 ; Malka, J 12 ; Mankel, R 12 ; Margotti, A 7 ; Marini, G 32 ; Martin, J F 49 ; Mastroberardino, A 26 ; Mattingly, M C K 50 ; I-A Melzer-Pellmann 12 ; Mergelmeyer, S 17 ; Miglioranzi, S 12 ; F Mohamad Idris 41 ; Monaco, V 31 ; Montanari, A 12 ; Morris, J D 51 ; Mujkic, K 12 ; Musgrave, B 27 ; Nagano, K 52 ; Namsoo, T 12 ; Nania, R 7 ; Nigro, A 32 ; Ning, Y 53 ; Nobe, T 43 ; Noor, U 19 ; Notz, D 12 ; Nowak, R J 24 ; Nuncio-Quiroz, A E 17 ; Oh, B Y 54 ; Okazaki, N 40 ; Oliver, K 29 ; Olkiewicz, K 28 ; Yu Onishchuk 11 ; Papageorgiu, K 36 ; Parenti, A 12 ; Paul, E 17 ; Pawlak, J M 24 ; Pawlik, B 28 ; Pelfer, P G 55 ; Pellegrino, A 37 ; Perlański, W 24 ; Perrey, H 12 ; Piotrzkowski, K 56 ; Pluciński, P 4 ; Pokrovskiy, N S 14 ; Polini, A 7 ; Proskuryakov, A S 33 ; Przybycień, M 3 ; Raval, A 12 ; Reeder, D D 21 ; Reisert, B 2 ; Ren, Z 53 ; Repond, J 27 ; Ri, Y D 38 ; Robertson, A 29 ; Roloff, P 12 ; Rubinsky, I 12 ; Ruspa, M 9 ; Sacchi, R 31 ; Salii, A 11 ; Samson, U 17 ; Sartorelli, G 6 ; Savin, A A 21 ; Saxon, D H 25 ; Schioppa, M 26 ; Schlenstedt, S 34 ; Schleper, P 46 ; Schmidke, W B 2 ; Schneekloth, U 12 ; Schönberg, V 17 ; Schörner-Sadenius, T 12 ; Schwartz, J 30 ; Sciulli, F 53 ; Shcheglova, L M 33 ; Shehzadi, R 17 ; Shimizu, S 40 ; Singh, I 5 ; Skillicorn, I O 25 ; Słomiński, W 47 ; Smith, W H 21 ; Sola, V 31 ; Solano, A 31 ; Son, D 57 ; Sosnovtsev, V 8 ; Spiridonov, A 12 ; Stadie, H 46 ; Stanco, L 18 ; Stern, A 1 ; Stewart, T P 49 ; Stifutkin, A 8 ; Stopa, P 28 ; Suchkov, S 8 ; Susinno, G 26 ; Suszycki, L 3 ; Sztuk-Dambietz, J 46 ; Szuba, D 46 ; Szuba, J 12 ; Tapper, A D 48 ; Tassi, E 26 ; Terrón, J 16 ; Theedt, T 12 ; Tiecke, H 37 ; Tokushuku, K 52 ; Tomalak, O 11 ; Tomaszewska, J 12 ; Tsurugai, T 58 ; Turcato, M 46 ; Tymieniecka, T 4 ; Vázquez, M 37 ; Verbytskyi, A 12 ; Viazlo, O 10 ; Vlasov, N N 13 ; Volynets, O 11 ; Walczak, R 29 ; W A T Wan Abdullah 41 ; Whitmore, J J 54 ; Wiggers, L 37 ; Wing, M 44 ; Wlasenko, M 17 ; Wolf, G 12 ; Wolfe, H 21 ; Wrona, K 12 ; Yagües-Molina, A G 12 ; Yamada, S 52 ; Yamazaki, Y 52 ; Yoshida, R 27 ; Youngman, C 12 ; Żarnecki, A F 24 ; Zawiejski, L 28 ; Zenaiev, O 12 ; Zeuner, W 12 ; Zhautykov, B O 14 ; Zhmak, N 20 ; Zhou, C 30 ; Zichichi, A 6 ; Zolkapli, Z 41 ; Zolko, M 11 ; Zotkin, D S 33
1 Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel
2 Max-Planck-Institut für Physik, München, Germany
3 Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Krakow, Poland
4 National Centre for Nuclear Research, Warsaw, Poland
5 Department of Physics, Panjab University, Chandigarh, India
6 University and INFN Bologna, Bologna, Italy
7 INFN Bologna, Bologna, Italy
8 Moscow Engineering Physics Institute, Moscow, Russia
9 Università del Piemonte Orientale, Novara, and INFN, Torino, Italy
10 Institute for Nuclear Research, National Academy of Sciences, Kyiv, Ukraine; Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine
11 Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine
12 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
13 Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany
14 Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan
15 INFN Florence, Florence, Italy
16 Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain
17 Physikalisches Institut der Universität Bonn, Bonn, Germany
18 INFN Padova, Padova, Italy
19 Department of Physics, York University, Toronto, Ontario, Canada
20 Institute for Nuclear Research, National Academy of Sciences, Kyiv, Ukraine
21 Department of Physics, University of Wisconsin, Madison, WI, USA
22 Dipartimento di Fisica dell’ Università and INFN, Padova, Italy
23 Physics Department, Ohio State University, Columbus, OH, USA
24 Faculty of Physics, University of Warsaw, Warsaw, Poland
25 School of Physics and Astronomy, University of Glasgow, Glasgow, UK
26 Physics Department and INFN, Calabria University, Cosenza, Italy
27 Argonne National Laboratory, Argonne, IL, USA
28 The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
29 Department of Physics, University of Oxford, Oxford, UK
30 Department of Physics, McGill University, Montréal, Québec, Canada
31 Università di Torino and INFN, Torino, Italy
32 Dipartimento di Fisica, Università ‘La Sapienza’ and INFN, Rome, Italy
33 Institute of Nuclear Physics, Moscow State University, Moscow, Russia
34 Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany
35 Department of Particle Physics and Astrophysics, Weizmann Institute, Rehovot, Israel
36 Department of Engineering in Management and Finance, Univ. of the Aegean, Chios, Greece
37 NIKHEF and University of Amsterdam, Amsterdam, Netherlands
38 Department of Physics, Tokyo Metropolitan University, Tokyo, Japan
39 Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK
40 Department of Physics, University of Tokyo, Tokyo, Japan
41 Jabatan Fizik, Universiti Malaya, Kuala Lumpur, Malaysia
42 Polytechnic University, Sagamihara, Japan
43 Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
44 Physics and Astronomy Department, University College London, London, UK
45 Institute for Universe and Elementary Particles, Chonnam National University, Kwangju, South Korea
46 Institute of Experimental Physics, Hamburg University, Hamburg, Germany
47 Department of Physics, Jagellonian University, Cracow, Poland
48 High Energy Nuclear Physics Group, Imperial College London, London, UK
49 Department of Physics, University of Toronto, Toronto, Ontario, Canada
50 Andrews University, Berrien Springs, MI, USA
51 H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
52 Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan
53 Nevis Laboratories, Columbia University, Irvington on Hudson, NY, USA
54 Department of Physics, Pennsylvania State University, University Park, PA, USA
55 University and INFN Florence, Florence, Italy
56 Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
57 Center for High Energy Physics, Kyungpook National University, Daegu, South Korea
58 Faculty of General Education, Meiji Gakuin University, Yokohama, Japan
1 Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel
2 Max-Planck-Institut für Physik, München, Germany
3 Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Krakow, Poland
4 National Centre for Nuclear Research, Warsaw, Poland
5 Department of Physics, Panjab University, Chandigarh, India
6 University and INFN Bologna, Bologna, Italy
7 INFN Bologna, Bologna, Italy
8 Moscow Engineering Physics Institute, Moscow, Russia
9 Università del Piemonte Orientale, Novara, and INFN, Torino, Italy
10 Institute for Nuclear Research, National Academy of Sciences, Kyiv, Ukraine; Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine
11 Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine
12 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
13 Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany
14 Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan
15 INFN Florence, Florence, Italy
16 Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain
17 Physikalisches Institut der Universität Bonn, Bonn, Germany
18 INFN Padova, Padova, Italy
19 Department of Physics, York University, Toronto, Ontario, Canada
20 Institute for Nuclear Research, National Academy of Sciences, Kyiv, Ukraine
21 Department of Physics, University of Wisconsin, Madison, WI, USA
22 Dipartimento di Fisica dell’ Università and INFN, Padova, Italy
23 Physics Department, Ohio State University, Columbus, OH, USA
24 Faculty of Physics, University of Warsaw, Warsaw, Poland
25 School of Physics and Astronomy, University of Glasgow, Glasgow, UK
26 Physics Department and INFN, Calabria University, Cosenza, Italy
27 Argonne National Laboratory, Argonne, IL, USA
28 The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
29 Department of Physics, University of Oxford, Oxford, UK
30 Department of Physics, McGill University, Montréal, Québec, Canada
31 Università di Torino and INFN, Torino, Italy
32 Dipartimento di Fisica, Università ‘La Sapienza’ and INFN, Rome, Italy
33 Institute of Nuclear Physics, Moscow State University, Moscow, Russia
34 Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany
35 Department of Particle Physics and Astrophysics, Weizmann Institute, Rehovot, Israel
36 Department of Engineering in Management and Finance, Univ. of the Aegean, Chios, Greece
37 NIKHEF and University of Amsterdam, Amsterdam, Netherlands
38 Department of Physics, Tokyo Metropolitan University, Tokyo, Japan
39 Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK
40 Department of Physics, University of Tokyo, Tokyo, Japan
41 Jabatan Fizik, Universiti Malaya, Kuala Lumpur, Malaysia
42 Polytechnic University, Sagamihara, Japan
43 Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
44 Physics and Astronomy Department, University College London, London, UK
45 Institute for Universe and Elementary Particles, Chonnam National University, Kwangju, South Korea
46 Institute of Experimental Physics, Hamburg University, Hamburg, Germany
47 Department of Physics, Jagellonian University, Cracow, Poland
48 High Energy Nuclear Physics Group, Imperial College London, London, UK
49 Department of Physics, University of Toronto, Toronto, Ontario, Canada
50 Andrews University, Berrien Springs, MI, USA
51 H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
52 Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan
53 Nevis Laboratories, Columbia University, Irvington on Hudson, NY, USA
54 Department of Physics, Pennsylvania State University, University Park, PA, USA
55 University and INFN Florence, Florence, Italy
56 Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
57 Center for High Energy Physics, Kyungpook National University, Daegu, South Korea
58 Faculty of General Education, Meiji Gakuin University, Yokohama, Japan
Pages
1-12
Publication year
2012
Publication date
Jan 2012
ISSN
14346044
e-ISSN
14346052
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2294059047
Copyright
The European Physical Journal C is a copyright of Springer, (2012). All Rights Reserved., © 2012. This work is published under https://creativecommons.org/licenses/by/2.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.