Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-05-22
Phys.Rev.D53:1264-1281,1996
Physics
High Energy Physics
High Energy Physics - Phenomenology
a few minor text changes made and references added; version to appear in Physical Review D; 36 pages, plain TeX, including eps
Scientific paper
10.1103/PhysRevD.53.1264
We discuss rescattering effects that can be measured in $e^+e^-$ annihilation to three jets through a single gauge boson, by using triple product (``event handedness'') correlations of the $Z$ ($\gamma^*$) polarization with jet momenta. The gauge boson polarization may be produced either by polarized beams or through the natural polarization (left-right asymmetry) of the $Z$. QCD rescattering does not generate triple product correlations at one loop for massless quarks. We therefore calculate the QCD contribution for massive quarks, as well as the contribution of $W$ and $Z$ exchange loops for massless quarks. Due to various cancellations, the standard model predictions for triple-product correlations at the $Z$ are very small, making such measurements potentially sensitive to physics beyond the standard model. For example, the effects of a new gauge boson that couples only to baryon number may be larger than the standard model contributions; however the effects would probably still be too small to effectively constrain it.
Brandenburg Arnd
Dixon Lance
Shadmi Yael
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