Table 2 Performance of the top-hat ESA of the LEP experiment

g-factor/22.5° channel

5.3 \(\times\) 10³ cm² sr eV/eV

3.4 \(\times\) 10³ cm² sr eV/eV

3.2 \(\times\) 10³ cm² sr eV/eV

Angular res.\({\varvec{\Delta}}{\varvec{\theta}}\)

6.5\(^\circ\) (FWHM)

6.0\(^\circ\) (FWHM)

6.1\(^\circ\) (FWHM)

Average elevation \(\langle {\varvec{\theta}}\rangle\)

1.1\(^\circ\)

0.52\(^\circ\)

0.73\(^\circ\)

Energy res.\({\varvec{\Delta}}{\varvec{K}}/{\varvec{K}}\)

19.2% (FWHM)

18.3% (FWHM)

18.6% (FWHM)

Analyzer const.\(\langle {\varvec{K}}\rangle /{\varvec{V}}\)

3.95

4.04

4.00