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000612173 005__ 20241201104710.0
000612173 0247_ $$2INSPIRETeX$$aCMS:2024pts
000612173 0247_ $$2inspire$$ainspire:2795514
000612173 0247_ $$2arXiv$$aarXiv:2406.03976
000612173 0247_ $$2datacite_doi$$a10.3204/PUBDB-2024-05186
000612173 037__ $$aPUBDB-2024-05186
000612173 041__ $$aEnglish
000612173 088__ $$2arXiv$$aarXiv:2406.03976
000612173 088__ $$2CMS$$aCMS-TOP-23-001
000612173 088__ $$2CERN$$aCERN-EP-2024-137
000612173 1001_ $$0P:(DE-HGF)0$$aCMS Collaboration$$b0$$eCollaboration author
000612173 245__ $$aObservation of quantum entanglement in top quark pair production in proton-proton collisions at $\sqrt{s}$ = 13 TeV
000612173 260__ $$c2024
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000612173 3367_ $$2BibTeX$$aARTICLE
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000612173 500__ $$aDie Autorenliste wurde beim Inspire-Import nicht übermittelt! Auch nicht über arXiv!
000612173 520__ $$aEntanglement 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 ($\mathrm{t\bar{t}}$) 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 $\mathrm{t\bar{t}}$ production density matrix and measured in the region of the $\mathrm{t\bar{t}}$ production threshold. Values of $D\lt-$1/3 are evidence of entanglement and $D$ is observed (expected) to be $-$0.480$^{+0.026}_{-0.029}$ ($-$0.467$^{+0.026}_{-0.029}$) 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 $\mathrm{t\bar{t}}$ pairs in this phase space. This measurement provides a new probe of quantum mechanics at the highest energies ever produced.
000612173 536__ $$0G:(DE-HGF)POF4-611$$a611 - Fundamental Particles and Forces (POF4-611)$$cPOF4-611$$fPOF IV$$x0
000612173 536__ $$0G:(GEPRIS)390833306$$aDFG project 390833306 - EXC 2121: Quantum Universe (390833306)$$c390833306$$x1
000612173 536__ $$0G:(GEPRIS)400140256$$aGRK 2497 - GRK 2497: Physik der schwersten Teilchen am Large Hadron Collider (400140256)$$c400140256$$x2
000612173 588__ $$aDataset connected to INSPIRE
000612173 650_7 $$2INSPIRE$$ap p: colliding beams
000612173 650_7 $$2INSPIRE$$atop: pair production
000612173 650_7 $$2INSPIRE$$ap p: scattering
000612173 650_7 $$2INSPIRE$$aspin: dependence
000612173 650_7 $$2INSPIRE$$aquantum mechanics: entanglement
000612173 650_7 $$2INSPIRE$$athreshold: production
000612173 650_7 $$2INSPIRE$$aentanglement: quantum
000612173 650_7 $$2INSPIRE$$aBell inequality
000612173 650_7 $$2INSPIRE$$alepton: transverse momentum
000612173 650_7 $$2INSPIRE$$atransverse momentum: high
000612173 650_7 $$2INSPIRE$$aCERN LHC Coll
000612173 650_7 $$2INSPIRE$$aCMS
000612173 650_7 $$2INSPIRE$$aCERN Lab
000612173 650_7 $$2INSPIRE$$adensity matrix
000612173 650_7 $$2INSPIRE$$alepton: pair production
000612173 650_7 $$2INSPIRE$$afinal state: ((n)jet dilepton)
000612173 650_7 $$2INSPIRE$$aparton
000612173 650_7 $$2INSPIRE$$aquark antiquark
000612173 650_7 $$2INSPIRE$$aphase space
000612173 650_7 $$2INSPIRE$$aexperimental results
000612173 650_7 $$2INSPIRE$$a13000 GeV-cms
000612173 693__ $$0EXP:(DE-H253)LHC-Exp-CMS-20150101$$1EXP:(DE-588)4398783-7$$5EXP:(DE-H253)LHC-Exp-CMS-20150101$$aLHC$$eLHC: CMS$$x0
000612173 8564_ $$uhttps://arxiv.org/abs/2406.03976
000612173 8564_ $$uhttps://bib-pubdb1.desy.de/record/612173/files/2406.03976v1.pdf$$yOpenAccess
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000612173 9141_ $$y2024
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