Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target

A Airapetian,S Potashov,N Bianchi,A Schwind,L.G Greeniaus,Y Gärber,J Wendland,P Liebing,G Schnell,J Visser,K Hafidi,F Garibaldi,R Seidl,J Stewart,L Lagamba,B Tchuiko,G Rosner,M Contalbrigo,S Yen,A Laziev,C Schill,F Menden,M Hartig,A Kisselev,A Ivanilov,A Hillenbrand,D Hasch,M Henoch,R Kaiser,J Volmer,E Garutti,Y Holler,R Fabbri,V Muccifora,S Belostotski,D Ryckbosch,F Ellinghaus,I Sanjiev,M Bouwhuis,Y Miyachi,E Kinney,N Meyners,H Kolster,A Rostomyan,A Reischl,D Heesbeen,C Scarlett,A Jgoun,W Augustyniak,A Brüll,A Fantoni,P Lenisa,G Gavrilov,D Reggiani,V Baturin,M Beckmann,R Shanidze,H Böttcher,O Grebeniouk,M Stancari,W Lorenzon,K Sinram,M Tytgat,G Iarygin,G Gapienko,G Elbakian,H Ohsuga,A Avetissian,U Elschenbroich,A Nass,R Hertenberger,S Frullani,S Taroian,A Izotov,Z Akopov,V Vikhrov,H Zohrabian,C Baumgarten,G Ciullo,L Lapikás,K Oganessyan,J Brack,Y Naryshkin,T Wise,A Elalaoui-Moulay,B Seitz,A Borissov,H Marukyan,T Lindemann,I Savin,B Hommez,W Haeberli,G.R Court,M Amarian,A Tkabladze,W.-D Nowak,K Königsmann,P Bailey,G Graw,L Felawka,V Kozlov,V Mexner,K Lipka,E Devitsin,F Masoli,O Mikloukho,H Avakian,M Düren,A Fechtchenko,M Kopytin,S Bernreuther,V Bryzgalov,M Ehrenfried,E Nappi,D Gaskell,C Weiskopf,M Statera,J Franz,S Tessarin,E Steffens,W.H.A Hesselink,E Avetissian,B Zihlmann,A Terkulov,E Thomas,V Shutov,R Avakian,A Andrus,V Gharibyan,Р Де Лео ,P Dalpiaz ,Meike Vogt ,T A Shibata ,E De Sanctis ,H E Jackson ,C A Miller ,Jürgen Wilbert ,James H Ely ,G M Urciuoli ,P E Reimer ,Satoshi Yoneyama ,G P Capitani ,Gian Luca Orlandi ,Hiroki Tanaka ,M C Simani ,J J M Steijger ,A Trzciński ,B Q ,V G Krivokhijine ,В А Коротков ,M G Vincter ,J Anthony Seibert ,N Makins ,Martin Raithel ,A R Reolon ,Andreas Schäfer ,В А Гапиенко ,K P Schüler ,Bernhard Krauß ,R Van De Vyver ,А Нагайцев ,B D Fox ,E C Aschenauer ,Christian Vogel ,V V Ammosov ,M C Vetterli ,H C Chiang ,L De Nardo ,P Van Der Nat ,H P Blok ,P Di Nezza ,Klaus Rith ,U Stößlein ,Н Акопов ,G Van Der Steenhoven ,D H Potterveld ,P Żuprański

doi:10.1016/s0370-2693(03)00566-5

Abstract

Single-spin asymmetries have been measured for semi-inclusive electroproduction of π+, π−, π0 and K+ mesons in deep-inelastic scattering off a longitudinally polarised deuterium target. The asymmetries appear in the distribution of the hadrons in the azimuthal angle φ around the virtual photon direction, relative to the lepton scattering plane. The corresponding analysing powers in the sinφ moment of the cross section are 0.012±0.002(stat.)±0.002(syst.) for π+, 0.006±0.003(stat.)±0.002(syst.) for π−, 0.021±0.005(stat.)±0.003(syst.) for π0 and 0.013±0.006(stat.)±0.003(syst.) for K+. The sin2φ moments are compatible with zero for all particles.

Highlights

It has been shown that another mechanism can cause a single-spin azimuthal asymmetry in semi-inclusive deep-inelastic scattering [23]
The process considered is the production of a pseudoscalar meson (m = π or K) in deep-inelastic positron scattering off a longitudinally polarised deuterium target: e + d → e + m + X
The angle φ is the azimuthal angle of the scattered meson around the virtual photon direction with respect to the lepton scattering plane

Summary

VU Research Portal

Link to publication in VU Research Portal citation for published version (APA) Airapetian, A., Hesselink, W. H. A., Volmer, J., van der Nat, P. Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights

HERMES Collaboration

Meson Deuterium target

Findings

Quadratic sum