BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Can local hidden-variable theories be excluded at colliders? DTSTART:20260414T160000Z DTEND:20260414T180000Z DTSTAMP:20260731T134318Z UID:2e9a3837-380e-4645-895f-42b29867d0c5 SEQUENCE:1 CREATED:20260407T082752Z DESCRIPTION: Recently\, there has been an increased interest in possible t ests of locality via Bell'\;s inequality or tests of entanglement at c olliders\, in particular at the LHC. These have involved various physical processes\, such as top-anti-top\, or tau+tau- production\, or the decay o f a Higgs boson to two vector bosons H->\;VV*. In this talk\, we argue t hat none of these proposals constitutes a test of locality via Bell'\; s inequality or a test of quantum entanglement without assuming an underly ing quantum field theory\, such as the Standard Model. In all cases\, what is measured is the momenta of the final state particles. Using the constr uction proposed by Kasday (1971) in a different context\, and adapted to c ollider scenarios by Abel\, Dittmar\, and Dreiner (1992)\, it is straightf orward to construct a local hidden variable theory (LHVT) which exactly re produces the data. This construction is only possible as the final state m omenta all commute. It is also by construction local with all correlations being separably generated. Thus\, an LHVT cannot yet be excluded at colli ders. LAST-MODIFIED:20260407T082752Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/en/events/can-local-hidden-variable-t heories-be-excluded-at-colliders/ X-ALT-DESC;FMTTYPE=text/html:

Recently\, there h as been an increased interest in possible tests of locality via Bell'\ ;s inequality or tests of entanglement at colliders\, in particular at the LHC. These have involved various physical processes\, such as top-anti-to p\, or tau+tau- production\, or the decay of a Higgs boson to two vector b osons H->\;VV*.

In this talk\, we argue that none of these pro posals constitutes a test of locality via Bell'\;s inequality or a tes t of quantum entanglement without assuming an underlying quantum field the ory\, such as the Standard Model. In all cases\, what is measured is the m omenta of the final state particles.

Using the construction prop osed by Kasday (1971) in a different context\, and adapted to collider sce narios by Abel\, Dittmar\, and Dreiner (1992)\, it is straightforward to c onstruct a local hidden variable theory (LHVT) which exactly reproduces th e data. This construction is only possible as the final state momenta all commute. It is also by construction local with all correlations being sepa rably generated. Thus\, an LHVT cannot yet be excluded at colliders.

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