Journal article
Authors list: Airapetian, A; Akopov, N; Akopov, Z; Amarian, M; Ammosov, VV; Andrus, A; Aschenauer, EC; Augustyniak, W; Avakian, R; Avetissian, A; Avetissian, E; Bailey, P; Balin, D; Baturin, V; Beckmann, M; Belostotski, S; Bernreuther, S; Bianchi, N; Blok, HP; Böttcher, H; Borissov, A; Borysenko, A; Bouwhuis, M; Brack, J; Brüll, A; Bryzgalov, V; Capitani, GP; Chen, T; Ciullo, G; Contalbrigo, M; Dalpiaz, PF; De Leo, R; Demey, M; De Nardo, L; De Sanctis, E; Devitsin, E; Di Nezza, P; Düren, M; Ehrenfried, M; Elalaoui-Moulay, A; Elbakian, G; Ellinghaus, F; Elschenbroich, U; Fabbri, R; Fantoni, A; Fechtchenko, A; Felawka, L; Frullani, S; Gapienko, G; Gapienko, V; Garibaldi, F; Garrow, K; Garutti, E; Gavrilov, G; Gharibyan, V; Graw, G; Grebeniouk, O; Greeniaus, LG; Gregor, IM; Griffioen, KA; Hafidi, K; Hartig, M; Hasch, D; Heesbeen, D; Henoch, M; Hertenberger, R; Hesselink, WHA; Hillenbrand, A; Hoek, M; Holler, Y; Hommez, B; Iarygin, G; Ivanilov, A; Izotov, A; Jackson, HE; Jgoun, A; Kaiser, R; Kinney, E; Kisselev, A; Kopytin, M; Korotkov, V; Kozlov, V; Krauss, B; Krivokhijine, VG; Lagamba, L; Lapikás, L; Laziev, A; Lenisa, P; Liebing, P; Linden-Levy, LA; Lipka, K; Lorenzon, W; Lu, H; Lu, J; Lu, S; Ma, BQ; Maiheu, B; Makins, NCR; Mao, Y; Marianski, B; Marukyan, H; Masoli, F; Mexner, V; Meyners, N; Mikloukho, O; Miller, CA; Miyachi, Y; Muccifora, V; Nagaitsev, A; Nappi, E; Naryshkin, Y; Nass, A; Negodaev, M; Nowak, WD; Oganessyan, K; Ohsuga, H; Osborne, A; Pickert, N; Potashov, S; Potterveld, DH; Raithel, M; Reggiani, D; Reimer, PE; Reischl, A; Reolon, AR; Riedl, C; Rith, K; Rosner, G; Rostomyan, A; Rubacek, L; Rubin, J; Ryckbosch, D; Salomatin, Y; Sanjiev, I; Savin, I; Schäfer, A; Schill, C; Schnell, G; Schüler, KP; Seele, J; Seidl, R; Seitz, B; Shanidze, R; Shearer, C; Shibata, TA; Shutov, V; Sinram, K; Sommer, W; Stancari, M; Statera, M; Steffens, E; Steijger, JJM; Stenzel, H; Stewart, J; Stinzing, F; Tait, P; Tanaka, H; Taroian, S; Tchuiko, B; Terkulov, A; Tkabladze, A; Trzcinski, A; Tytgat, M; Vandenbroucke, A; van der Nat, P; van der Steenhoven, G; van Haarlem, Y; Vetterli, MC; Vikhrov, V; Vincter, MG; Vogel, C; Vogt, M; Volmer, J; Weiskopf, C; Wendland, J; Wilbert, J; Smit, GY; Ye, Y; Ye, Z; Yen, S; Zihlmann, B; Zupranski, P
Publication year: 2004
Pages: 212-222
Journal: Physics Letters B
Volume number: 599
Issue number: 3-4
ISSN: 0370-2693
eISSN: 1873-2445
DOI Link: https://doi.org/10.1016/j.physletb.2004.08.059
Publisher: Elsevier
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 = 3 GeV2 higher-twist effects can be as large as the leading-twist longitudinal component. (C) 2004 Published by Elsevier B.V.
Citation Styles
Harvard Citation style: Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Ammosov, V., Andrus, A., et al. (2004) Hard exclusive electroproduction of π+π- pairs, Physics Letters B, 599(3-4), pp. 212-222. https://doi.org/10.1016/j.physletb.2004.08.059
APA Citation style: Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Ammosov, V., Andrus, A., Aschenauer, E., Augustyniak, W., Avakian, R., Avetissian, A., Avetissian, E., Bailey, P., Balin, D., Baturin, V., Beckmann, M., Belostotski, S., Bernreuther, S., Bianchi, N., Blok, H., ...Zupranski, P. (2004). Hard exclusive electroproduction of π+π- pairs. Physics Letters B. 599(3-4), 212-222. https://doi.org/10.1016/j.physletb.2004.08.059
Keywords
2 PIONS; DENSITY MATRIX; GENERALIZED PARTON DISTRIBUTIONS; MONTE-CARLO GENERATOR; P(0) MESONS; QCD; VECTOR-MESON PRODUCTION
