Data di Pubblicazione:
2024
Abstract:
Entanglement is a key feature of quantum mechanics1–3, with applications in fields such as metrology, cryptography, quantum information and quantum computation4–8. It has been observed in a wide variety of systems and length scales, ranging from the microscopic9–13 to the macroscopic14–16. However, entanglement remains largely unexplored at the highest accessible energy scales. Here we report the highest-energy observation of entanglement, in top–antitop quark events produced at the Large Hadron Collider, using a proton–proton collision dataset with a centre-of-mass energy of √s = 13 TeV and an integrated luminosity of 140 inverse femtobarns (fb)−1 recorded with the ATLAS experiment. Spin entanglement is detected from the measurement of a single observable D, inferred from the angle between the charged leptons in their parent top- and antitop-quark rest frames. The observable is measured in a narrow interval around the top–antitop quark production threshold, at which the entanglement detection is expected to be significant. It is reported in a fiducial phase space defined with stable particles to minimize the uncertainties that stem from the limitations of the Monte Carlo event generators and the parton shower model in modelling top-quark pair production. The entanglement marker is measured to be D = −0.537 ± 0.002 (stat.) ± 0.019 (syst.) for 340GeV<380GeV. The observed result is more than five standard deviations from a scenario without entanglement and hence constitutes the first observation of entanglement in a pair of quarks and the highest-energy observation of entanglement so far.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Particle physics, High energy physics
Elenco autori:
Null, Null; Aad, G.; Abbott, B.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B. S.; Bourdarios, C. Adam; Adamczyk, L.; Addepalli, S. V.; Addison, M. J.; Adelman, J.; Adiguzel, A.; Adye, T.; Affolder, A. A.; Afik, Y.; Agaras, M. N.; Agarwala, J.; Aggarwal, A.; Agheorghiesei, C.; Ahmad, A.; Ahmadov, F.; Ahmed, W. S.; Ahuja, S.; Ai, X.; Aielli, G.; Aikot, A.; Tamlihat, M. Ait; Aitbenchikh, B.; Aizenberg, I.; Akbiyik, M.; Åkesson, T. P. A.; Akimov, A. V.; Akiyama, D.; Akolkar, N. N.; Aktas, S.; Khoury, K. Al; Alberghi, G. L.; Albert, J.; Albicocco, P.; Albouy, G. L.; Alderweireldt, S.; Alegria, Z. L.; Aleksa, M.; Aleksandrov, I. N.; Alexa, C.; Alexopoulos, T.; Alfonsi, F.; Algren, M.; Alhroob, M.; Ali, B.; Ali, H. M. J.; Ali, S.; Alibocus, S. W.; Aliev, M.; Alimonti, G.; Alkakhi, W.; Allaire, C.; Allbrooke, B. M. M.; Allen, J. F.; Flores, C. A. Allendes; Allport, P. P.; Aloisio, A.; Alonso, F.; Alpigiani, C.; Estevez, M. Alvarez; Fernandez, A. Alvarez; Cardoso, M. Alves; Alviggi, M. G.; Aly, M.; Coutinho, Y. Amaral; Ambler, A.; Amelung, C.; Amerl, M.; Ames, C. G.; Amidei, D.; Dos Santos, S. P. Amor; Amos, K. R.; Ananiev, V.; Anastopoulos, C.; Andeen, T.; Anders, J. K.; Andrean, S. Y.; Andreazza, A.; Angelidakis, S.; Angerami, A.; Anisenkov, A. V.; Annovi, A.; Antel, C.; Anthony, M. T.; Antipov, E.; Antonelli, M.; Anulli, F.; Aoki, M.; Aoki, T.; Pozo, J. A. Aparisi; Aparo, M. A.; Bella, L. Aperio; Appelt, C.; Apyan, A.; Val, S. J. Arbiol; Arcangeletti, C.; Arce, A. T. H.; Arena, E.; Arguin, J-F.; Argyropoulos, S.; Arling, J. -H.; Arnaez, O.; Arnold, H.; Artoni, G.; Asada, H.; Asai, K.; Asai, S.; Asbah, N. A.; Assamagan, K.; Astalos, R.; Atashi, S.; Atkin, R. J.; Atkinson, M.; Atmani, H.; Atmasiddha, P. A.; Augsten, K.; Auricchio, S.; Auriol, A. D.; Austrup, V. A.; Avolio, G.; Axiotis, K.; Azuelos, G.; Babal, D.; Bachacou, H.; Bachas, K.; Bachiu, A.; Backman, F.; Badea, A.; Baer, T. M.; Bagnaia, P.; Bahmani, M.; Bahner, D.; Bailey, A. J.; Bailey, V. R.; Baines, J. T.; Baines, L.; Baker, O. K.; Bakos, E.; Gupta, D. Bakshi; Balakrishnan, V.; Balasubramanian, R.; Baldin, E. M.; Balek, P.; Ballabene, E.; Balli, F.; Baltes, L. M.; Balunas, W. K.; Balz, J.; Banas, E.; Bandieramonte, M.; Bandyopadhyay, A.; Bansal, S.; Barak, L.; Barakat, M.; Barberio, E. L.; Barberis, D.; Barbero, M.; Barel, M. Z.; Barends, K. N.; Barillari, T.; Barisits, M-S.; Barklow, T.; Baron, P.; Moreno, D. A. Baron; Baroncelli, A.; Barone, G.; Barr, A. J.; Barr, J. D.; Barreiro, F.; Da Costa, J. Barreiro Guimarães; Barron, U.; Teixeira, M. G. Barros; Barsov, S.; Bartels, F.; Bartoldus, R.; Barton, A. E.; Bartos, P.; Basan, A.; Baselga, M.; Bassalat, A.; Basso, M. J.; Basson, C. R.; Bates, R. L.; Batlamous, S.; Batley, J. R.; Batool, B.; Battaglia, M.; Battulga, D.; Bauce, M.; Bauer, M.; Bauer, P.; Hurrell, L. T. Bazzano; Beacham, J. B.; Beau, T.; Beaucamp, J. Y.; Beauchemin, P. H.; Bechtle, P.; Beck, H. P.; Becker, K.; Beddall, A. J.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Beermann, T. A.; Begalli, M.; Begel, M.; Behera, A.; Behr, J. K.; Beirer, J. F.; Beisiegel, F.; Belfkir, M.; Bella, G.; Bellagamba, L.; Bellerive, A.; Bellos, P.; Beloborodov, K.; Benchekroun, D.; Bendebba, F.; Benhammou, Y.; Beresford, L.; Beretta, M.; Kuutmann, E. Bergeaas; Berger, N.; Bergmann, B.; Beringer, J.; Bernardi, G.; Bernius, C.; Bernlochner, F. U.; Bernon, F.; Guardia, A. Berrocal; Berry, T.; Berta, P.; Berthold, A.; Bertram, I. A.; Bethke, S.; Betti, A.; Bevan, A. J.; Bhalla, N. K.; Bhamjee, M.; Bhatta, S.; Bhattacharya, D. S.; Bhattarai, P.; Bhide, K. D.; Bhopatkar, V. S.; Bianchi, R. M.; Bianco, G.; Biebel, O.; Bielski, R.; Biglietti, M.; Billingsley, C. S.; Bindi, M.; Bingul, A.; Bini, C.; Biondini, A.; Birch-sykes, C. J.; Bird, G. A.; Birman, M.; Biros, M.; Biryukov, S.; Bisanz, T.; Bisceglie, E.; Biswal, J. P.; Biswas, D.; Bjørke, K.; Bloch, I.; Blue, A.; Blum
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