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Digitale Medien

Measurement of the spin-density matrix elements in exclusive electroproduction of $\rho^0$ mesons at HERA (2000)

Breitweg et al., J.

Springer

The European physical journal 12 (2000), S. 393-410

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Details

ISSN: 1434-6052

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract. Exclusive electroproduction of $\rho^0$ mesons has been measured using the ZEUS detector at HERA in two $Q^2$ ranges, $0.25 〈 Q^2 〈 0.85$ GeV $^2$ and $3〈 Q^2 〈 30$ GeV $^2$ . The low- $Q^2$ data span the range $20 〈 W 〈 90$ GeV; the high- $Q^2$ data cover the $40 〈 W 〈 120$ GeV interval. Both samples extend up to four-momentum transfers of $|t|=0.6$ GeV $^2$ . The distribution in the azimuthal angle between the positron scattering plane and the $\rho^0$ production plane shows a small but significant violation of s-channel helicity conservation, corresponding to the production of longitudinally polarised (i.e. helicity zero) $\rho^0$ mesons from transverse photons. Measurements of the 15 combinations of spin-density matrix elements which completely define the angular distributions are presented and discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s100529900246

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