Charm production by weak neutral currents |
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Authors: | V Barger RL Kingsley RJN Phillips DM Scott |
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Institution: | Physics Department, University of Wisconsin, Madison, WI 53706, USA;Rutherford Laboratory, Chilton, Didcot, Oxon, England |
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Abstract: | We discuss quantitatively the production of charm in neutral current interactions, and the anomalous lepton events that follow from semi-leptonic charm decay. Diagonal neutral currents, in the Weinberg-Salam model and similar models, predict associated charm production with small cross sections: e.g. at high energy. The meagre data on vN → ve+X are consistent with a rate of this order. Non-diagonal neutral currents, if present, could give larger cross sections via valence p → c transitions. It should be possible to distinguish diagonal from non-diagonal contributions by their x- or u-dependences, where u = x(1 ? y). We calculate the expected energy distributions of the leptons in characteristic vN → v?+X and vN → v?+??X charm decay events using simple models, and discuss some practical problems in neutral current measurements. |
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