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http://bura.brunel.ac.uk/handle/2438/31354| Title: | Observation of quantum entanglement in top quark pair production in proton-proton collisions at √ s = 13 TeV |
| Authors: | Hayrapetyan, A Tumasyan, A Adam, W Andrejkovic, JW Bergauer, T Chatterjee, S Damanakis, K Dragicevic, M Hoang, A Hussain, PS Jeitler, M Gokbulut, G Hong, Y Knolle, J Lambrecht, L Marckx, D Mota Amarilo, K Samalan, A Skovpen, K Van Den Bossche, N van der Linden, J Wezenbeek, L Benecke, A Bethani, A Bruno, G Caputo, C De Favereau De Jeneret, J Delaere, C Donertas, IS Giammanco, A Guzel, AO Jain, S Lemaitre, V Lidrych, J Mastrapasqua, P Tran, TT Wertz, S Alves, GA Alves Gallo Pereira, M Coelho, E Correia Silva, G Hensel, C Menezes De Oliveira, T Mora Herrera, C Moraes, A Reid, ID Rebello Teles, P Soeiro, M Vilela Pereira, A Kyberd, P Aldá, WL Barroso Ferreira Filho, M Khan, A Brandao Malbouisson, H Cole, JE Coldham, K Krammer, N Li, A Liko, D Mikulec, I Schieck, J Schöfbeck, R Schwarz, D Sonawane, M Templ, S Waltenberger, W Wulz, CE Janssen, T Van Laer, T Van Mechelen, P Breugelmans, N D'Hondt, J Dansana, S De Moor, A Delcourt, M Heyen, F Lowette, S Makarenko, I Müller, D Tavernier, S Tytgat, M Van Onsem, GP Van Putte, S Vannerom, D Bilin, B Clerbaux, B Das, AK De Lentdecker, G Evard, H Favart, L Gianneios, P Jaramillo, J Khalilzadeh, A Khan, FA Lee, K Mahdavikhorrami, M Malara, A Paredes, S Shahzad, MA Thomas, L Vanden Bemden, M Vander Velde, C Vanlaer, P De Coen, M Dobur, D |
| Keywords: | high energy physics - experiment (hep-ex) |
| Issue Date: | 23-Oct-2024 |
| Publisher: | IOP Publishing |
| Citation: | Hayrapetyan, A., Tumasyan, A. et al. for the benefit of the CMS collaboration (2024) 'Observation of quantum entanglement in top quark pair production in proton-proton collisions at √ s = 13 TeV', Reports on Progress in Physics, 87 (11), 117801, pp. 1 - 33. doi: 10.1088/1361-6633/ad7e4d. |
| Abstract: | 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 ¯ ) 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 ¯ production density matrix and measured in the region of the t t ¯ 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 ¯ pairs in this phase space. This measurement provides a new probe of quantum mechanics at the highest energies ever produced. |
| Description: | Data availability statement:
Release and preservation of data used by the CMS Collaboration as the basis for publications is guided by the CMS data preservation, re-use, and open access policy. A preprint version of the article is available at arXiv:2406.03976v2 [hep-ex] (the peer reviewed version, https://arxiv.org/abs/2406.03976). Comments: Replaced with the published version. Added the journal reference and the DOI. Journal reference: Rep. Prog. Phys. 87 (2024) 117801. All the figures and tables can be found at https://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-23-001 (CMS Public Pages). Report numbers: CMS-TOP-23-001, CERN-EP-2024-137. Submission history: [v2] Tue, 29 Oct 2024 12:35:26 UTC (840 KB). |
| URI: | https://bura.brunel.ac.uk/handle/2438/31354 |
| DOI: | https://doi.org/10.1088/1361-6633/ad7e4d |
| ISSN: | 0034-4885 |
| Other Identifiers: | ORCiD: A. Tumasyan https://orcid.org/0009-0001-6311-3104 ORCiD: Joanne E. Cole https://orcid.org/0000-0001-5638-7599 ORCiD: Akram Khan https://orcid.org/0000-0002-4597-4402 ORCiD: Paul Kyberd https://orcid.org/0000-0002-7353-7090 ORCiD: Ivan D. Reid https://orcid.org/0000-0002-9235-779X Article number: 117801 CMS-TOP-23-001 CERN-EP-2024-137 arXiv:2406.03976v2 [hep-ex] |
| Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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