Spin effects at fragmentation of polarized deuterons into pions

Details Spin effects at fragmentation of polarized deuterons into pions Spin effects at fragmentation of polarized deuterons into pions

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..889a&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 889-889 (2001).

Physics

2H-Induced Reactions, A<=5, 6<=A<=19, Polarization Phenomena In Reactions

Scientific paper

Tensor analyzing power T20 in dvec A-->π(θ=0°)X has been measured at fragmentation of 9 GeV deuterons into pions with the momenta from 3.5 to 5.3 GeV/c at H-, Be-, and C-targets. This momentum range corresponds to region of cumulative pion production where the deuteron core structure up to r~=0.4 fm is probed. The values of T20 are found to be small and positive in contradiction with the Impulse Approximation calculations assuming a direct mechanism of pion production on high momentum nucleon in the deuteron (NN-->NNπ). In this report we present new data on tensor Ayy analyzing powers at non-zero angles (θ=135,180mr) with pion transverse momenta up to Pt=0.8 GeV/c. Ayy increases with rise of Pt in the cumulative region reaching the magnitude of -0.4 at Pt=0.7-0.8 GeV/c. .

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