Spin density matrix elements in exclusive ω electroproduction on ¹H and ²H targets at 27.5 GeV beam energy
- Airapetian, A
- Akopov, N
- Akopov, Z
- Augustyniak, W
- Avetissian, A
- Blok, HP
- Borissov, A
- Bryzgalov, V
- Capiluppi, M
- Capitani, GP
- Cisbani, E
- Ciullo, G
- Contalbrigo, M
- Dalpiaz, PF
- Deconinck, W
- De Leo, R
- De Sanctis, E
- Diefenthaler, M
- Di Nezza, P
- Düren, M
- Ehrenfried, M
- Elbakian, G
- Ellinghaus, F
- Etzelmüller, E
- Fabbri, R
- Felawka, L
- Frullani, S
- Gabbert, D
- Gapienko, G
- Gapienko, V
- Garibaldi, F
- Gavrilov, G
- Gharibyan, V
- Hartig, M
- Hasch, D
- Holler, Y
- Hristova, I
- Ivanilov, A
- Jackson, HE
- Joosten, S
- Kaiser, R
- Karyan, G
- Keri, T
- Kinney, E
- Kisselev, A
- Korotkov, V
- Kozlov, V
- Kravchenko, P
- Krivokhijine, VG
- Lagamba, L
- Lapikás, L
- Lehmann, I
- Lenisa, P
- Lorenzon, W
- Ma, BQ
- Mahon, D
- Manaenkov, SI
- Mao, Y
- Marianski, B
- Marukyan, H
- Movsisyan, A
- Murray, M
- Naryshkin, Y
- Nass, A
- Nowak, WD
- Pappalardo, LL
- Perez-Benito, R
- Petrosyan, A
- Reimer, PE
- Reolon, AR
- Riedl, C
- Rith, K
- Rostomyan, A
- Ryckbosch, Dirk
- Schäfer, A
- Schnell, G
- Schüller, KP
- Seitz, B
- Shibata, TA
- Stahl, M
- Stancari, M
- Statera, M
- Steffens, E
- Steijger, JJM
- Taroian, S
- Terkulov, A
- Truty, R
- Trzcinski, A
- Tytgat, Michael
- Van Haarlem, Y
- VanHulse, C
- Vikhrov, V
- Vilardi, I
- Wang, S
- Yaschenko, S
- Yen, S
- Zeiler, D
- Zihlmann, B
- Zupranski, P
DOIAbstract
Exclusive electroproduction of. mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of Q(2) > 1.0 GeV2, 3.0 GeV omega(T) and gamma(T)* -> omega(T), is determined for the first time. A hierarchy of helicity amplitudes is established, which mainly means that the unnatural-parity-exchange amplitude describing the gamma(T)* -> omega(T) transition dominates over the two natural-parity-exchange amplitudes describing the gamma(L)* -> omega(L) and gamma(T)* -> omega(T) transitions, with the latter two being of similar magnitude. Good agreement is found between the HERMES proton data and results of a pQCD-inspired phenomenological model that includes pion-pole contributions, which are of unnatural parity
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