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Relaxing atomic parity violation constraints on new physics
The weak charge ${Q}_{W}$ measured in atomic parity violation experiments can receive compensating contributions from more than one new physics source. We show explicitly that the $\ensuremath{\Delta}{Q}_{W}$ contribution from the exchange of an extra $Z$-boson can cancel that from the $s$-channel scalar top or scalar charm exchange in $R$-parity violating …