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Summary
DescriptionHERA-EWcurrents.webp
English: The EW interaction is mediated to first order therefore when the momentum transfer-squared becomes bigger than the mass of the charged W and the neutral Z boson squared (<10^4) the magnitude of their differential cross sections become comparable so the charged and neutral currents (CC (red) & NC (blue)) appear indistinguishable but it also becomes lower so they look hard to distinguish from the massless photon too, that is EW unification starts to set in.
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Captions
Differential cross-section versus momentum transfer-squared measured at the HERA collider for neutral (blue) and charged (red) current (NC & CC) deep inelastic scattering processes.