A kinematic reconstruction technique for tau pairs at Higgs factories, using momenta and impact parameters with weighted solutions, enables spin polarimeter extraction and shows photon angular resolution is the dominant detector need.
The polarimeter vector forτ→3πντdecays
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Observation of seven MI transitions (Fg=3 to Fe=5) of the Cs 456 nm line that exceed conventional transition intensities and shift by ~17 GHz at 3 kG, matching Zeeman theory predictions.
Combined CMS result gives α^{Hττ} = 7 ± 16° for the CP mixing angle in H→ττ, consistent with SM expectation of 0 ± 14°.
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Observation of Magnetically-Induced atomic transitions of the Cs 6S$_{1/2} \rightarrow 7$P$_{3/2}$ line at 456 nm
Observation of seven MI transitions (Fg=3 to Fe=5) of the Cs 456 nm line that exceed conventional transition intensities and shift by ~17 GHz at 3 kG, matching Zeeman theory predictions.