Double spin asymmetries in the cross-section of rho0 and phi production at intermediate-energies - INSPIRE

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Double spin asymmetries in the cross-section of rho0 and phi production at intermediate-energies

HERMES

Collaboration

•

A. Airapetian

Feb, 2003

8 pages

Published in:

Eur.Phys.J.C 29 (2003) 171-179

e-Print:

hep-ex/0302012 [hep-ex]

DOI:

10.1140/epjc/s2003-01232-3

Report number:

DESY-02-230

Experiments:

DESY-HERA-HERMES

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Abstract:

Double-spin asymmetries in the cross section of electroproduction of

\rho^0

and

\phi

mesons on the proton and deuteron are measured at the HERMES experiment. The photoabsorption asymmetry in exclusive

\rho^0

electroproduction on the proton exhibits a positive tendency. This is consistent with theoretical predictions that the exchange of an object with unnatural parity contributes to exclusive

\rho^0

electroproduction by transverse photons. The photoabsorption asymmetry on the deuteron is found to be consistent with zero. Double-spin asymmetries in

\rho^0

and

\phi

meson electroproduction by quasi-real photons were also found to be consistent with zero: the asymmetry in the case of the

\phi

meson is compatible with a theoretical prediction which involves

s\bar{s}

knockout from the nucleon.

Note:

8 pages, 7 figures Report-no: DESY 02-230

electron p: inelastic scattering
electron deuteron: inelastic scattering
electron: polarized beam
polarized target
rho(770): electroproduction
Phi(1020): electroproduction
spin: asymmetry
x-dependence
momentum transfer dependence
transverse momentum dependence

References(28)

Figures(0)

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)

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