Characterization of the quantum state of top quark pairs produced in proton-proton collisions at $\sqrt{s}$ = 13 TeV using the beam and helicity bases
Measurements of the spin correlation coefficients in the beam basis are presented for top quark-antiquark (𝑡$\overline{𝑡}$) systems produced in proton-proton collisions at √𝑠 =13 TeV collected by the CMS experiment in 2016–2018, and corresponding to an integrated luminosity of 138 fb$^{−1}$. The 𝑡$\overline{𝑡}$ system is reconstructed from final states containing an electron or muon and jets. Together with the previously reported results in the helicity basis, these measurements are used to decompose the system into the Bell and spin eigenstates in various kinematic regions. The spin correlation coefficients are also used to evaluate properties of the 𝑡$\overline{𝑡}$ quantum state, such as the purity, von Neumann entropy, and entanglement. All results are consistent with standard model predictions.
Authors
- W. Adam (ORCID: https://orcid.org/0000-0001-9099-4341)
- Schieck
- M. A. Shahzad (ORCID: https://orcid.org/0009-0000-1458-5941)
- C. Hensel
- G. Bruno (ORCID: https://orcid.org/0000-0001-8857-8197)
- D. Müller (ORCID: https://orcid.org/0000-0002-1752-4527)
- Farha Anjum Khan
- I. Makarenko
- J. Van Der Linden
- C Sturm for the KaoS Collaboration
- D. Ocampo Henao
- A. Hayrapetyan
- P. S. Hussain
- M. Dragicevic
- T. Janssen
- P. Mastrapasqua
- J. De Favereau De Jeneret
- N. Breugelmans
- C. Giordano (ORCID: https://orcid.org/0000-0001-6317-2481)
- A. R. Tumasyan
- T. Bergauer
- W. Waltenberger (ORCID: https://orcid.org/0000-0002-6215-7228)
- M. Vanden Bemden
- H. Aarup Petersen
- D. Kavtaradze
- A. K. Das
- Karam Kaspar (ORCID: https://orcid.org/0009-0002-1357-5092)
- S. Dansana
- N Krammer (ORCID: https://orcid.org/0000-0002-0548-0985)
- P. Kashko
- W. L. Aldá Júnior (ORCID: https://orcid.org/0000-0001-5855-9817)
- M. Soeiro
- S. Turkcapar
- A. Khalilzadeh
- T. Menezes De Oliveira
- V. Makarenko
- M. Matthewman
- P. Malek
- M. Shooshtari
- J. Bierkens
- F. Heyen
- G De Lentdecker
- C Mora Herrera
- M. Tytgat
- S Lowette
- M. Sonawane
- M. Jeitler
- N. Van Den Bossche
- A. M. Tomaru
- B Bilin
- J. Lidrych
- D. Liko
- K Skovpen
- R. Schöfbeck
- M. De Coen
- H. Evard
- S. Van Putte
- D. Dobur (ORCID: https://orcid.org/0000-0003-0012-4866)
- G. Gokbulut
- A. Benecke (ORCID: https://orcid.org/0000-0003-0252-3609)
- C. Delaere
- J. D'Hondt (ORCID: https://orcid.org/0000-0002-9598-6241)
- D. Vannerom
- V. Lemaitre
- A. Bethani
- S. Bein
- Wulz C. -E.
- L. Benato (ORCID: https://orcid.org/0000-0001-5135-7489)
- A. Malara (ORCID: https://orcid.org/0000-0001-8645-9282)
- P. Vanlaer
- P. Rebello Teles
- M. Delcourt
- A. Vilela Pereira (ORCID: https://orcid.org/0000-0003-3177-4626)
- B. Clerbaux
- L. Thomas
- G. A. Alves (ORCID: https://orcid.org/0000-0002-8369-1446)
- E. J. Tonelli Manganote
- D. Matos Figueiredo (ORCID: https://orcid.org/0000-0003-2514-6930)
- G. P. Van Onsem
- A. Giammanco
- I. De Bruyn (ORCID: https://orcid.org/0000-0003-1704-4360)
- P. Gianneios
- C. Vander Velde
- D. Marckx
- E. Coelho
- A. O. Guzel
- A. De Moor
- J. Vandenbroeck
- M. Barroso Ferreira Filho
- H. Kwon
- T. Van Laer
- Y. Hong
- F. Gameiro Casalinho
- F. Zhang
- L. Favart
- A. Sharma
- S. Tavernier
- A. J. Li
- P. Van Mechelen
- A. Cappati
- M. Barroso Ferreira Filho
Publication Details
- Journal
- KITopen
- Published
- 2026-10-16
- DOI
- https://doi.org/10.5445/ir/1000198050
- Primary Topic
- Particle physics theoretical and experimental studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00