Leading asymmetries in two-hadron production in e^+e^- annihilation at the Z pole
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We present the leading unpolarized and single spin asymmetries in inclusive two-hadron production in electron-positron annihilation at the Z pole. The azimuthal dependence in the unpolarized differential cross section of almost back-to-back hadrons is a leading cos(2 phi) asymmetry, which arises solely due to the intrinsic transverse momenta of the quarks. An extensive discussion on how to measure this asymmetry and the accompanying time-reversal odd fragmentation functions is given. A simple estimate indicates that the asymmetry could be of the order of a percent.
8 pages, Revtex, 2 Postscript figures, uses epsf.sty. Some typos corrected, minor clarifying changes, one reference added, including a comment at the end
8 pages, Revtex, 2 Postscript figures, uses epsf.sty. Some typos corrected, minor clarifying changes, one reference added, including a comment at the end