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New probes for extended gauge structures at the DESY<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ep</mml:mi></mml:math>collider HERA
Doncheski and Hewett have recently shown that the ratio of neutral current to charged current cross sections, $R=\frac{{\ensuremath{\sigma}}_{\mathrm{NC}}}{{\ensuremath{\sigma}}_{\mathrm{CC}}}$, can provide a more sensitive probe for the existence of heavy leptoquarks at the DESY $\mathrm{ep}$ collider HERA than the usual procedure which makes use of neutral current asymmetries. The apparent reason …