Double spin asymmetry in exclusive rho(0) muoproduction at COMPASS

作者：Alekseev M^*; Alexakhin V Yu; Alexandrov Yu; Alexeev G D; Amoroso A; Arbuzov A; Badelek B; Balestra F; Ball J; Baum G; Barth J; Bedfer Y; Bernet C; Bertini R; Bettinelli M; Birsa R; Bisplinghoff J; Bordalo P; Bradamante F; Bravar A; Bressan A; Brona G; Burtin E; Bussa M P; Chapiro A; Chiosso M; Cicuttin A; Colantoni M; Costa S; Crespo M L; d'Hose N; Dalla Torre S; Das S; Dasgupta S S; De Masi R; Dedek N; Denisov O Yu

来源：European Physical Journal C, 2007, 52(2): 255-265.

DOI：10.1140/epjc/s10052-007-0376-6

The longitudinal double spin asymmetry A(1)(rho) for exclusive leptoproduction of rho(0) mesons, mu+N ->mu+N+rho, is studied using the COMPASS 2002 and 2003 data. The measured reaction is incoherent exclusive rho(0) production on polarised deuterons. The Q(2) and x dependence of A(1)(rho) is presented in a wide kinematical range, 3x10(-3) < Q(2) < 7 (GeV/c)(2) and 5x10(-5)< x < 0.05. The results presented are the first measurements of A(1) >rho at small Q(2) (Q(2) < 0.1 (GeV/c)(2) ) and small x (x < 3x10(-3) ). The asymmetry is in general compatible with zero in the whole kinematical range.

• 出版日期2007-10
• 单位中国地震局