Test Of Spin Dependence In Charm-Quark Fragmentation To D-Star

Aihara, Alston-Garnjost,Avery,Barker,Bauer, Bay, Belcinski, Bingham, Bloom, Buchanan, Caldwell,Chao, Chun, Clark,Cowan, Crane, Dahl, Daoudi, Derby, Eastman, Eberhard, Edberg,Eisner, Erné, Fairfield, Fridman,Godfrey, Hauptman, Ho, Hofmann, Kamae, Kenney, Khacheryan, Kofler, Lambert, Langeveld, Layter, Lin, Linde,Loken, Lu, Lynch, Lys, Madaras, Magnuson, Marsiske, Masek, Mathis, Maxfield, Miller, Nicol, Nygren, Oddone, Oh, Oyang, Paar, Palounek, Park, Pellett, Pripstein, Ronan, Ross, Rouse, Schwitkis

PHYSICAL REVIEW D（1991）

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摘要

We have measured the polarization of D*, the energy dependence of the polarization, and the spin-density matrix of D* in e+e- annihilation at a center-of-mass energy of 29 GeV using the Time Projection Chamber detector at the SLAC storage ring PEP. In 147 pb-1 of data we see no strong evidence for polarization, alignment, or final-state interactions in this fragmentation process.

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关键词

center of mass,time projection chamber,density matrix,angular momentum,elementary particles

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