1978•University of North Texas Digital Library (University of North Texas)Open access
Amplitude analysis of Y*(1385) production in the line-reversed reactions:. pi. /sup +/p. -->. K/sup +/Y*(1385) and K/sup -/p. -->. pi. /sup -/Y*(1385) at 7 and 11. 5 GeV/c. [Sigma(1385). -->. lambda pi. ,. lambda. -->. p. pi. /sup -/, angular distribution, helicity--flip and non-flip]
J. Ballam, Jacques Bouchez, J. T. Carroll
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Abstract
For the first time in one detector measurements were made of the complete decay angular distribution on Y* ..-->.. ..lambda pi.., ..lambda.. ..-->.. p..pi../sup -/ in the two line-reversed reactions: ..pi../sup +/p ..-->.. K/sup +/Y*(1385) and K/sup -/p ..-->.. ..pi../sup -/Y*(1385). The experiment was conducted in the SLAC 1 m rapid cycling bubble chamber (15 Hertz) triggered by electronic detectors and an online algorithm. The extended maximum likelihood method was used to obtain the transversity amplitudes of the Y *(1385). Results are in good agreement with both the quark model and Stodolsky-Sakurai model predictions. Finite helicity nonflip contributions at the Y*vertex observed in these data can be associated with double quark scattering in the forward direction. 15 references.