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Observation of quantum entanglement in top quark pair production in proton-proton collisions at √s = 13 TeVстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A.A., Klyukhin V., Markina A., Obraztsov S., Perfilov M., Savrin V., Volkov P., Vorotnikov G.A., Collaboration CMS
- Журнал: Reports on Progress in Physics
- Том: 87
- Год издания: 2024
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- Первая страница: 117801
- DOI: 10.1088/1361-6633/ad7e4d
- Аннотация: 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 (tt¯) 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 tt¯ production density matrix and measured in the region of the tt¯ production threshold. Values of D < −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 tt¯ pairs in this phase space. This measurement provides a new probe of quantum mechanics at the highest energies ever produced.
- Добавил в систему: Клюхин Вячеслав Иванович
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