Airapetian, A and Akopov, N and Akopov, Z and Amarian, M and Ammosov, VV and Andrus, A and Aschenauer, E. C. and Augustyniak, W and Avakian, R and Avetissian, A and Avetissian, E and Bailey, P and Balin, D and Baturin, V and Beckmann, M and Belostotski, S and Bernreuther, S and Bianchi, N and Blok, HP and Bottcher, H and Borissov, A and Borysenko, A and Bouwhuis, M and Brack, J and Brull, A and Bryzgalov, V and Capitani, GP and Chen, T and Ciullo, G and Contalbrigo, M and Dalpiaz, PF and De Leo, R and Demey, M and De Nardo, L and De Sanctis, E and Devitsin, E and Di Nezza, P and Duren, M and Ehrenfried, M and Elalaoui-Moulay, A and Elbakian, G and Ellinghaus, F and Elschenbroich, U and Fabbri, R and Fantoni, A and Fechtchenko, A and Felawka, L and Frullani, S and Gapienko, G and Gapienko, V and Garibaldi, F and Garrow, K and Garutti, E and Gavrilov, G and Gharibyan, V and Graw, G and Grebeniouk, O and Greeniaus, LG and Gregor, IM and Griffioen, KA and Hafidi, K and Hartig, M and Hasch, D and Heesbeen, D and Henoch, M and Hertenberger, R and Hesselink, WHA and Hillenbrand, A and Hoek, M and Holler, Y and Hommez, B and Iarygin, G and Ivanilov, A and Izotov, A and Jackson, HE and Jgoun, A and Kaiser, R and Kinney, E and Kisselev, A and Kopytin, M and Korotkov, V and Kozlov, V and Krauss, B and Krivokhijine, VG and Lagamba, L and Lapikas, L and Laziev, A and Lenisa, P and Liebing, P and Linden-Levy, LA and Lipka, K and Lorenzon, W and Lu, H and Lu, J and Lu, S and Ma, BQ and Maiheu, B and Makins, NCR and Mao, Y and Marianski, B and Marukyan, H and Masoli, F and Mexner, V and Meyners, N and Mikloukho, O and Miller, CA and Miyachi, Y and Muccifora, V and Nagaitsev, A and Nappi, E and Naryshkin, Y and Nass, A and Negodaev, M and Nowak, WD and Oganessyan, K and Ohsuga, H and Osborne, A and Pickert, N and Potashov, S and Potterveld, DH and Raithel, M and Reggiani, D and Reimer, PE and Reischl, A and Reolon, AR and Riedl, C and Rith, K and Rosner, G and Rostomyan, A and Rubacek, L and Rubin, J and Ryckbosch, D and Salomatin, Y and Sanjiev, I and Savin, I and Schaefer, Andreas and Schill, C and Schnell, G and Schuler, KP and Seele, J and Seidl, R and Seitz, B and Shanidze, R and Shearer, C and Shibata, TA and Shutov, V and Sinram, K and Sommer, W and Stancari, M and Statera, M and Steffens, E and Steijger, JJM and Stenzel, H and Stewart, J and Stinzing, F and Tait, P and Tanaka, H and Taroian, S and Tchuiko, B and Terkulov, A and Tkabladze, A and Trzcinski, A and Tytgat, M and Vandenbroucke, A and van der Nat, P and van der Steenhoven, G and van Haarlem, Y and Vetterli, MC and Vikhrov, V and Vincter, MG and Vogel, C and Vogt, M and Volmer, J and Weiskopf, C and Wendland, J and Wilbert, J and Smit, GY and Ye, Y and Ye, Z and Yen, S and Zihlmann, B and Zupranski, P (2004) Hard exclusive electroproduction of pi(+)pi(-) pairs. PHYSICS LETTERS B, 599 (3-4). pp. 212-222. ISSN 0370-2693, 1873-2445
Full text not available from this repository. (Request a copy)Abstract
Hard exclusive electroproduction of pi(+) pi(-) pairs off hydrogen and deuterium targets has been studied by the HERMES experiment at DESY Legendre moments (P-1) and (P-3) of the angular distributions of pi(+) mesons in the center-of-mass frame of the pair have been measured for the first time. Their dependence on the pi(+) pi(-) invariant mass can be understood as being due to the interference between relative P-wave (isovector) and S-, D-wave (isoscalar) states of the two pions. The increase in magnitude of (P-1) as Bjorken x increases is interpreted in the framework of generalized parton distributions as an enhancement of flavour non-singlet qq exchange for larger values of x, which leads to a sizable admixture of isoscalar and isovector pion pairs. In addition, the interference between P-wave and D-wave states separately for transverse and longitudinal pion pairs has been studied. The data indicate that in the f(2)(1270) region at <Q(2)> = 3 GeV2 higher-twist effects can be as large as the leading-twist longitudinal component. (C) 2004 Published by Elsevier B.V.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GENERALIZED PARTON DISTRIBUTIONS; VECTOR-MESON PRODUCTION; MONTE-CARLO GENERATOR; DENSITY MATRIX; P(0) MESONS; 2 PIONS; SCATTERING; QCD; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Jun 2021 04:56 |
| Last Modified: | 28 Jun 2021 04:56 |
| URI: | https://pred.uni-regensburg.de/id/eprint/37083 |
Actions (login required)
 |
View Item |
