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HEP Theory Seminar

Testing Locality via Bell’s Inequality at Colliders?

by Herbi Dreiner

Europe/Berlin
Description

There has recently been much work on supposed tests of locality via Bell’s inequality, as well as test of entanglement at colliders, in particular in the t tbar system, but also in gauge boson pair production. I argue that these are all in fact NOT tests of locality or entanglement. I present a construction for a local hidden variable theory (LHVT) which explains all the data. The LHVT is by construction NOT entangled and also always satisfies Bell’s inequality, as it must. The main reason for this problem at colliders is that one (almost) exclusively measures momenta, and thus commuting variables. There is thus no test of locality via Bell’s inequality with free fermions, even though that was Bell’s original proposal. The Aspect experiment with photons remains the conclusive test in favor of quantum mechanics.