Using 1986 PEP collider Bhabha scattering data, the authors set a 95% confidence upper bound of ε < 0.042 on a Gaussian angular smearing parameter modeling Born-rule violations.
Derrick et al., Experimental study of the reactions e+e− →e +e− ande +e− →γγat 29 GeV, Phys
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First constraint on Born-rule violations at high-energy colliders
Using 1986 PEP collider Bhabha scattering data, the authors set a 95% confidence upper bound of ε < 0.042 on a Gaussian angular smearing parameter modeling Born-rule violations.