Hard Exclusive Electroproduction of $π^+π^-$ Pairs

Details Hard Exclusive Electroproduction of $π^+π^-$ Pairs Hard Exclusive Electroproduction of $π^+π^-$ Pairs

2004-06-18

arxiv.org/abs/hep-ex/0406052v2

Phys.Lett.B599:212-222,2004

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1016/j.physletb.2004.08.059

Hard exclusive electroproduction of $\pi^+\pi^-$ pairs off hydrogen and deuterium targets has been studied by the HERMES experiment at DESY. Legendre moments $$ and $$ of the angular distributions of $\pi^+$ mesons in the center-of-mass frame of the pair have been measured for the first time. Their dependence on the $\pi^+\pi^-$ invariant mass can be understood as being due to the interference between relative $P$-wave (isovector) and $S,D$-wave (isoscalar) states of the two pions. % The increase in magnitude of $$ as Bjorken $x$ increases is interpreted in the framework of Generalized Parton Distributions as an enhancement of flavour {non-singlet} $q\bar{q}$ exchange for larger values of $x$, which leads to a sizable admixture of isoscalar and isovector pion pairs. % In addition, the interference between {$P$-wave} and {$D$-wave} states separately for transverse and longitudinal pion pairs has been studied. The data indicate that at {$\la Q^2 \ra = 3 $ GeV$^2$} higher twist effects can be as large as the leading-twist longitudinal component

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