Characterization of the quantum state of top quark pairs produced in proton-proton collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml

Measurements of the spin correlation coefficients in the beam basis are presented for top quark-antiquark ( <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mi>t</a:mi> <a:mover accent="true"> <a:mi>t</a:mi> <a:mo stretchy="false">¯</a:mo> </a:mover> </a:math> ) systems produced in proton-proton collisions at <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:msqrt> <e:mi>s</e:mi> </e:msqrt> <e:mo>=</e:mo> <e:mn>13</e:mn> <e:mtext> </e:mtext> <e:mtext> </e:mtext> <e:mi>TeV</e:mi> </e:math> collected by the CMS experiment in 2016–2018, and corresponding to an integrated luminosity of <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:mn>138</g:mn> <g:mtext> </g:mtext> <g:mtext> </g:mtext> <g:msup> <g:mi>fb</g:mi> <g:mrow> <g:mo>−</g:mo> <g:mn>1</g:mn> </g:mrow> </g:msup> </g:math> . The <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"> <i:mi>t</i:mi> <i:mover accent="true"> <i:mi>t</i:mi> <i:mo stretchy="false">¯</i:mo> </i:mover> </i:math> 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 <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"> <m:mi>t</m:mi> <m:mover accent="true"> <m:mi>t</m:mi> <m:mo stretchy="false">¯</m:mo> </m:mover> </m:math> quantum state, such as the purity, von Neumann entropy, and entanglement. All results are consistent with standard model predictions.

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Physical review. D/Physical review. D.
Published
2026-01-29
DOI
https://doi.org/10.1103/hkgw-dztk
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High-Energy Particle Collisions Research
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article
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article

Characterization of the quantum state of top quark pairs produced in proton-proton collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml

M. Ferrero, Martina Del Vecchio, Shivam Raj, Lovisa Rygaard et al.
Physical review. D/Physical review. D.
High-Energy Particle Collisions Research
article

Characterization of the quantum state of top quark pairs produced in proton-proton collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml

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Cussans, S. Turkcapar, D. Menasce, J. Fan, E. Collins, M. Stojanovic, K. Downham, M. I. Asghar, J. Thomas-Wilsker, D. D. C. Wickramarathna, A. Cardini, V. Sarkisovi, G. Dash, J. M. Vizan Garcia, J. Lidrych, Y. f. Lo, J. B. Singh, E. Garutti, A. Khalilzadeh, R. Kumar Verma, J. Choi, A. Colaleo, M. M. Hussain, M. Thiel, I.-A. Melzer-Pellmann, G. I. Veres, R. Schöfbeck, F. Ivone, C. Li, M. Vander Donckt, D. Schwarz, R. A. Manzoni, J. Duarte, G. Negro, F. Palla, H. Nogima, G. Pásztor, A. Mascellani, I. Neutelings, W. D. Zeuner, J. Mariano, A. Giassi, K. Ranjan, A. Soto Rodríguez, B. Fischer, S. Abbott, X. Fan, D. Ramos, R. Hadjiiska, G. Antchev, A. Chhetri, B. K. Chitroda, F. Bilandzija, J. S. Tafoya Vargas, A. Dimitrov, M. Wayne, G. Alverson, V. Karjavine, P. Sheldon, K. Pedro, A. Tumasyan, A. Muthirakalayil Madhu, F. Torres Da Silva De Araujo, S. Somalwar, M. B. Tonjes, O. Bessidskaia Bylund, E. Yanes, C. Fangmeier, S. Campbell, M. Fernandez, S. Han, A. W. Jung, V. Palichik, C. Dziwok, S. Varghese, H. J. Simonis, G. Hamilton Ilha Machado, L. Uplegger, P. Baringer, O. Davignon, Q. Wang, A. Lath, S. Thomas, D. Lange, M. Mulders, G. Dissertori, M. Pitt, S. Rudrabhatla, E. Meschi, M. Guchait, S. Cittolin, T. Holmes, T. Huang, R. Zou, D. Guerrero, T. Pauletto, K. Cormier, Y. Maravin, S. V. Clark, I. Papadopoulos, X. Wang, F. Nemes, E. Manca, G. M. Bilei, A. Bundock, M. Murray, P. G. Verdini, B. Kiani, W. Adam, S. Marcellini, F. L. Navarria, B. Cox, V. Lohezic, T. Cheng, R. F. Von Cube, C. Moore, D. Ocampo Henao, C. M. Morcillo Perez, A. David, M. V. Srivastav, M. Toms, M. Alhusseini, S. Rossi Tisbeni, C. Mora Herrera, A. Bornheim, D. Stafford, Y. Hosseini
article en

Abstract

Measurements of the spin correlation coefficients in the beam basis are presented for top quark-antiquark ( <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mi>t</a:mi> <a:mover accent="true"> <a:mi>t</a:mi> <a:mo stretchy="false">¯</a:mo> </a:mover> </a:math> ) systems produced in proton-proton collisions at <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:msqrt> <e:mi>s</e:mi> </e:msqrt> <e:mo>=</e:mo> <e:mn>13</e:mn> <e:mtext> </e:mtext> <e:mtext> </e:mtext> <e:mi>TeV</e:mi> </e:math> collected by the CMS experiment in 2016–2018, and corresponding to an integrated luminosity of <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:mn>138</g:mn> <g:mtext> </g:mtext> <g:mtext> </g:mtext> <g:msup> <g:mi>fb</g:mi> <g:mrow> <g:mo>−</g:mo> <g:mn>1</g:mn> </g:mrow> </g:msup> </g:math> . The <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"> <i:mi>t</i:mi> <i:mover accent="true"> <i:mi>t</i:mi> <i:mo stretchy="false">¯</i:mo> </i:mover> </i:math> 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 <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"> <m:mi>t</m:mi> <m:mover accent="true"> <m:mi>t</m:mi> <m:mo stretchy="false">¯</m:mo> </m:mover> </m:math> quantum state, such as the purity, von Neumann entropy, and entanglement. All results are consistent with standard model predictions.

Physical review. D/Physical review. D.Vol. 113(5)
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