Article
Measurement of ep -> ep pi(0) beam spin asymmetries above the resonance region
Physical Review C
(2008)
- R De Masi
- M Garcon
- B Zhao
- MJ Amaryan
- P Ambrozewicz
- M Anghinolfi
- G Asryan
- H Avakian
- H Bagdasaryan
- N Baillie
- J Ball
- JP Ball
- NA Baltzell
- V Batourine
- M Battaglieri
- I Bedlinskiy
- M Bellis
- N Benmouna
- BL Berman
- P Bertin
- AS Biselli
- L Blaszczyk
- S Bouchigny
- S Boiarinov
- R Bradford
- D Branford
- WJ Briscoe
- WK Brooks
- S Bultmann
- VD Burkert
- C Butuceanu
- JR Calarco
- SL Careccia
- DS Carman
- L Casey
- S Chen
- L Cheng
- PL Cole
- P Collins
- P Coltharp
- D Crabb
- V Crede
- N Dashyan
- E De Sanctis
- R De Vita
- PV Degtyarenko
- A Deur
- KV Dharmawardane
- R Dickson
- C Djalali
- GE Dodge
- J Donnelly
- D Doughty
- M Dugger
- OP Dzyubak
- H Egiyan
- KS Egiyan
- L El Fassi
- L Elouadrhiri
- P Eugenio
- G Fedotov
- G Feldman
- A Fradi
- H Funsten
- G Gavalian
- GP Gilfoyle
- KL Giovanetti
- FX Girod
- JT Goetz
- A Gonenc
- RW Gothe
- KA Griffioen
- M Guidal
- N Guler
- L Guo
- V Gyurjyan
- K Hafidi
- H Hakobyan
- C Hanretty
- FW Hersman
- K Hicks
- I Hleiqawi
- M Holtrop
- CE Hyde-Wright
- Y Ilieva
- DG Ireland
- BS Ishkhanov
- EL Isupov
- MM Ito
- D Jenkins
- HS Jo
- JR Johnstone
- K Joo
- HG Juengst
- N Kalantarians
- JD Kellie
- M Khandaker
- W Kim
- A Klein
- FJ Klein
- AV Klimenko
- M Kossov
- Z Krahn
- LH Kramer
- V Kubarovsky
- J Kuhn
- SE Kuhn
- SV Kuleshov
- J Lachniet
- JM Laget
- J Langheinrich
- D Lawrence
- T Lee
- K Livingston
- HY Lu
- M MacCormick
- N Markov
- P Mattione
- M Mazouz
- B McKinnon
- BA Mecking
- MD Mestayer
- CA Meyer
- T Mibe
- B Michel
- K Mikhailov
- M Mirazita
- R Miskimen
- V Mokeev
- B Moreno
- K Moriya
- SA Morrow
- M Moteabbed
- E Munevar
- GS Mutchler
- P Nadel-Turonski
- R Nasseripour
- S Niccolai
- G Niculescu
- I Niculescu
- BB Niczyporuk
- MR Niroula
- RA Niyazov
- M Nozar
- M Osipenko
- AI Ostrovidov
- K Park
- E Pasyuk
- C Paterson
- SA Pereira
- J Pierce
- N Pivnyuk
- D Pocanic
- O Pogorelko
- S Pozdniakov
- JW Price
- S Procureur
- Y Prok
- D Protopopescu
- BA Raue
- G Ricco
- M Ripani
- BG Ritchie
- F Ronchetti
- G Rosner
- P Rossi
- F Sabatie
- J Salamanca
- C Salgado
- JP Santoro
- V Sapunenko
- RA Schumacher
- VS Serov
- YG Sharabian
- D Sharov
- NV Shvedunov
- ES Smith
- LC Smith
- DI Sober
- D Sokhan
- A Stavinsky
- S Stepanyan
- SS Stepanyan
- BE Stokes
- P Stoler
- II Strakovsky
- S Strauch
- M Taiuti
- DJ Tedeschi
- A Tkabladze
- S Tkachenko
- C Tur
- M Ungaro
- MF Vineyard
- AV Vlassov
- E Voutier
- DP Watts
- LB Weinstein
- DP Weygand
- M Williams, University of Massachusetts - Amherst
- E Wolin
- MH Wood
- A Yegneswaran
- L Zana
- J Zhang
- ZW Zhao
Abstract
The beam spin asymmetry (BSA) in the exclusive reaction e⃗p→epπ0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer (CLAS). The xB,Q2,t, and ϕ dependences of the π0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sinϕ function and their amplitudes are extracted. Overall, they are of the order of 0.04–0.11 and roughly independent of t. This is the signature of a nonzero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.
Disciplines
Publication Date
January 1, 2008
Publisher Statement
Doi:10.1103/PhysRevC.77.042201
Copyright 2008 by The American Physical Society.
http://prc.aps.org/pdf/PRC/v77/i4/e042201
Citation Information
R De Masi, M Garcon, B Zhao, MJ Amaryan, et al.. "Measurement of ep -> ep pi(0) beam spin asymmetries above the resonance region" Physical Review C Vol. 77 Iss. 4 (2008) Available at: http://works.bepress.com/michael_williams/111/