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:20260703T131707Z UID:2e9a3837-380e-4645-895f-42b29867d0c5 SEQUENCE:2 CREATED:20260407T082801Z DESCRIPTION:Recently\, there has been an increased interest in possible te sts of locality via Bell'\;s inequality or tests of entanglement at co lliders\, in particular at the LHC. These have involved various physical p rocesses\, such as top-anti-top\, or tau+tau- production\, or the decay of a Higgs boson to two vector bosons H->\;VV*. In this talk\, we argue th at none of these proposals constitutes a test of locality via Bell'\;s inequality or a test of quantum entanglement without assuming an underlyi ng quantum field theory\, such as the Standard Model. In all cases\, what is measured is the momenta of the final state particles. Using the constru ction proposed by Kasday (1971) in a different context\, and adapted to co llider scenarios by Abel\, Dittmar\, and Dreiner (1992)\, it is straightfo rward to construct a local hidden variable theory (LHVT) which exactly rep roduces the data. This construction is only possible as the final state mo menta all commute. It is also by construction local with all correlations being separably generated. Thus\, an LHVT cannot yet be excluded at collid ers. LAST-MODIFIED:20260407T082810Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/can-local-hidden-variable- theories-be-excluded-at-colliders/ X-ALT-DESC;FMTTYPE=text/html:

Recently\, there ha s 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-top \, or tau+tau- production\, or the decay of a Higgs boson to two vector bo sons H->\;VV*.

In this talk\, we argue that none of these prop osals constitutes a test of locality via Bell'\;s inequality or a test of quantum entanglement without assuming an underlying quantum field theo ry\, such as the Standard Model. In all cases\, what is measured is the mo menta of the final state particles.

Using the construction propo sed by Kasday (1971) in a different context\, and adapted to collider scen arios by Abel\, Dittmar\, and Dreiner (1992)\, it is straightforward to co nstruct a local hidden variable theory (LHVT) which exactly reproduces the data. This construction is only possible as the final state momenta all c ommute. It is also by construction local with all correlations being separ ably generated. Thus\, an LHVT cannot yet be excluded at colliders.
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