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Zeitschrift für Physik C
ISSN: 0170-9739 (printed version)
ISSN: 1431-5858 (electronic version)
Abstract Volume 74 Issue 3 (1997) pp 531-534
Positivity restrictions to the transverse polarization of the inclusively detected spin-half baryons in unpolarized electron-positron annihilation
Chun-Gui Duan (1)(2)(3), Wei Lu (1)(2)
(1) CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, People's Republic of China
(2) Institute of High Energy Physics, P.O. Box 918(4), Beijing 100039, People's Republic of China
(3) Department of Physics, Hebei Nornal University, Hebei 050016, People's Republic of China
Received: 14 May 1996
Abstract. The positivity constraints to the structure functions for the inclusive spin-half baryon production by a time-like photon fragmentation are investigated. One conclusion is that Fˆ, which arises from the hadronic final-state interactions, is subjected to an inequality between its absolute value and the two spin-independent structure functions. On the basis of this finding, we derive a formula through which the upper limits can be given for the transverse polarization of the inclusively detected spin-half baryons in unpolarized electron-positron annihilation. The derived upper bound supplies a consistency check for the judgement of reliability of experimental data and model calculations.
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