Spin Effects at Fragmentation of GeV Polarized Deuterons Into Pions with Large Transverse Momentum

L Zolin,S Afanasiev,L S Azhgirey,A Yu Isupov,A N Khrenov,V P Ladygin,A Litvinenko,V Peresedov,Yu K Pilipenko,V N Zhmyrov,I Daito,N Doushita, Shigehisa Fukui,N Horikawa,Kenichi Kondo, Takahiro Iwata,V N Penev

Spin 2004: 16th International Spin Physics Symposium（2005）

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Abstract

The extracted polarized deuteron beam at the Dubna 10 GeV accelerator was used to study Ayy and Ay analyzing powers in the reaction dA -> pi(theta)X. Measurements at emission angles theta = 0, 135, and 180 mrad performed with 5 and 9 GeV/c deuterons showed a strong energy dependence of Ayy, and its linear rise at pion transverse momentum Pt from 0.4 to 0.8 GeV/c. The strong spin effects in this Pt-interval determined by D-state in the deuteron can be interpreted as evidence for correlation of meson-exchange (quark-exchange) currents in short range NN-interactions with orbital momentum of a strongly correlated NN-pair (6q-configuration).

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Key words

gev polarized deuterons,pions,spin

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