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Contact Interaction Explanation of HERA Events and $SU(3)_C\times SU(2)_L\times U(1)_Y$ Invariance

N. G. Deshpande·B. Dutta·Xiao-Gang He
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Abstract

We reexamine the contact interaction hypothesis for excess high-$Q^2$ events seen at HERA in $e^+ p \to e^+ X$ scattering. We consider the most general structure of contact interactions insisting on $SU(3)_C\times SU(2)_L \times U(1)_Y$ invariance. Apart from constraints for $e^+ e^- \to q\bar q$ , Drell-Yan and atomic parity violation experiments, we find stringent constraints from neutrino deep inelastic data. A possible choice of contact terms that escape present bounds is still possible, althought new data from FERMILAB and LEP should further constrain such a possibility.

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N. G. Deshpande, B. Dutta, Xiao-Gang He. 1997-05-08. Contact Interaction Explanation of HERA Events and $SU(3)_C\times SU(2)_L\times U(1)_Y$ Invariance. https://doi.org/10.1016/s0370-2693(97)00856-3

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