Observation of quantum entanglement in top quark pair production in proton-proton collisions at SQUARE ROOTs=13 TeV

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10493353" target="_blank" >RIV/00216208:11320/24:10493353 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=e4Kv9kxGTm" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=e4Kv9kxGTm</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1361-6633/ad7e4d" target="_blank" >10.1088/1361-6633/ad7e4d</a>

Result language
angličtina
Original language name
Observation of quantum entanglement in top quark pair production in proton-proton collisions at SQUARE ROOTs=13 TeV
Original language description
Entanglement is an intrinsic property of quantum mechanics and is predicted to be exhibited in the particles produced at the Large Hadron Collider. A measurement of the extent of entanglement in top quark-antiquark (t (t) over bar) events produced in proton-proton collisions at a center-of-mass energy of 13 TeV is performed with the data recorded by the CMS experiment at the CERN LHC in 2016, and corresponding to an integrated luminosity of 36.3 fb(-1). The events are selected based on the presence of two leptons with opposite charges and high transverse momentum. An entanglement-sensitive observable D is derived from the top quark spin-dependent parts of the t (t) over bar production density matrix and measured in the region of the t (t) over bar production threshold. Values of D < -1/3 are evidence of entanglement and D is observed (expected) to be -0.480(-0.029)(+0.026) (-0.467(-0.029)(+0.026)) at the parton level. With an observed significance of 5.1 standard deviations with respect to the non-entangled hypothesis, this provides observation of quantum mechanical entanglement within t (t) over bar pairs in this phase space. This measurement provides a new probe of quantum mechanics at the highest energies ever produced.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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