Relativistic symmetry suppresses quark spin-orbit splitting.
Experimental data indicate small spin-orbit splittings in hadrons. For heavy-light mesons we identify a relativistic symmetry that suppresses these splittings. We suggest an experimental test in electron-positron annihilation. Furthermore, we argue that the dynamics necessary for this symmetry are possible in QCD.
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MS B283, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Goldman
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Ginocchio
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