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First Measurement of the T-odd Correlation between the Z0 Spin and the Three-jet Plane Orientation in Polarized Z0 Decays to Three Jets

The SLD Collaboration
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Abstract

We present the first measurement of the correlation between the $Z^0$ spin and the three-jet plane orientation in polarized $Z^0$ decays into three jets in the SLD experiment at SLAC utilizing a longitudinally polarized electron beam. The CP-even and T-odd triple product $\vec{S_Z}\cdot(\vec{k_1}\times \vec{k_2})$ formed from the two fastest jet momenta, $\vec{k_1}$ and $\vec{k_2}$, and the $Z^0$ polarization vector $\vec{S_Z}$, is sensitive to physics beyond the Standard Model. We measure the expectation value of this quantity to be consistent with zero and set 95\% C.L. limits of $-0.022 < β< 0.039$ on the correlation between the $Z^0$-spin and the three-jet plane orientation.

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The SLD Collaboration. 1995-10-17. First Measurement of the T-odd Correlation between the Z0 Spin and the Three-jet Plane Orientation in Polarized Z0 Decays to Three Jets. https://doi.org/10.1103/physrevlett.75.4173

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