Single-spin azimuthal asymmetry in exclusive electroproduction of pi(+) mesons
- Airapetian A
- Akopov N
- Akopov Z
- Amarian M
- Aschenauer EC
- Avakian H
- Avakian R
- Avetissian A
- Avetissian E
- Bailey P
- Baturin V
- Baumgarten C
- Beckmann M
- Belostotski S
- Bernreuther S
- Bianchi N
- Bottcher H
- Borissov A
- Bouhali O
- Bouwhuis M
- Brack J
- Brauksiepe S
- Brull A
- Brunn I
- Bulten HJ
- Capitani GP
- Chumney P
- Cisbani E
- Ciullo G
- Court GR
- Dalpiaz PF
- De Leo R
- De Nardo L
- De Sanctis E
- De Schepper D
- Devitsin E
- Huberts PKAD
- Di Nezza P
- Duren M
- Ehrenfried M
- Elbakian G
- Ellinghaus F
- Ely J
- Fabbri R
- Fantoni A
- Fechtchenko A
- Felawka L
- Filippone BW
- Fischer H
- Fox B
- Franz J
- Frullani S
- Garber Y
- Garibaldi F
- Garutti E
- Gavrilov G
- Gharibyan V
- Graw G
- Grebeniouk O
- Green PW
- Greeniaus LG
- Gute A
- Haeberli W
- Hafidi K
- Hartig M
- Hasch D
- Heesbeen D
- Heinsius FH
- Henoch M
- Hertenberger R
- Hesselink WHA
- Hofman G
- Holler Y
- Holt RJ
- Hommez B
- Iarygin G
- Izotov A
- Jackson HE
- Jgoun A
- Jung P
- Kaiser R
- Kisselev A
- Kitching P
- Konigsmann K
- Kolster H
- Korotkov V
- Kotik E
- Kozlov V
- Krauss B
- Krivokhijine VG
- Kyle G
- Lagamba L
- Laziev A
- Lenisa P
- Liebing P
- Lindemann T
- Lorenzon W
- Maas A
- Makins NCR
- Marukyan H
- Masoli F
- McIlhany K
- Meissner F
- Menden F
- Mexner V
- Meyners N
- Mikloukho O
- Milner R
- Muccifora V
- Nagaitsev A
- Nappi E
- Naryshkin Y
- Nass A
- Negodaeva K
- Nowak WD
- Oganessyan K
- O'Neill TG
- Owen BR
- Pate SF
- Podiatchev S
- Potashov S
- Potterveld DH
- Raithel M
- Rakness G
- Rappoport V
- Redwine R
- Reggiani D
- Reimer P
- Reolon AR
- Rith K
- Robinson D
- Rostomyan A
- Ryckbosch D
- Sakemi Y
- Sanjiev I
- Sato F
- Savin I
- Scarlett C
- Schafer A
- Schill C
- Schmidt F
- Schnell G
- Schuler KP
- Schwind A
- Seibert J
- Seitz B
- Shibata TA
- Shutov V
- Simani MC
- Simon A
- Sinram K
- Steffens E
- Steijger JJM
- Stewart J
- Stosslein U
- Suetsugu K
- Taroian S
- Terkulov A
- Tessarin S
- Thomas E
- Tipton B
- Tytgat M
- Urciuoli GM
- van den Brand JFJ
- van der Steenhoven G
- van de Vyver R
- Vetterli MC
- Vikhrov V
- Vincter MG
- Visser J
- Volmer J
- Weiskopf C
- Wendland J
- Wilbert J
- Wise T
- Yen S
- Yoneyama S
- Zohrabian H
DOIAbstract
A single-spin asymmetry in the distribution of exclusively produced pi(+) mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin moment of the polarization asymmetry of the cross section is measured to be -0.18 +/- 0.05(stat.) +/- 0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t --> t(min) (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon). (C) 2002 ...
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