Observation of quantum entanglement in top quark pair production in proton-proton collisions at √s=13 TeV

被引：17

作者：

Hayrapetyan, A. ^{[2
]}

Tumasyan, A. ^{[2
,208
]}

Adam, W. ^{[3
]}

Andrejkovic, J. W. ^{[3
]}

Bergauer, T. ^{[3
]}

Chatterjee, S. ^{[3
,65
]}

Damanakis, K. ^{[3
]}

Dragicevic, M. ^{[3
]}

Hoang, A. ^{[3
,209
]}

Hussain, P. S. ^{[3
]}

Jeitler, M. ^{[3
,210
]}

Krammer, N. ^{[3
]}

Li, A. ^{[3
]}

Liko, D. ^{[3
]}

Mikulec, I. ^{[3
]}

Schieck, J. ^{[3
,210
]}

Schoefbeck, R. ^{[3
]}

Schwarz, D. ^{[3
]}

Sonawane, M. ^{[3
]}

Templ, S. ^{[3
]}

Waltenberger, W. ^{[3
]}

Wulz, C. -E. ^{[3
,210
]}

Janssen, T. ^{[4
]}

Van Laer, T. ^{[4
]}

Van Mechelen, P. ^{[4
]}

Breugelmans, N. ^{[5
]}

D'Hondt, J. ^{[5
]}

Dansana, S. ^{[5
]}

De Moor, A. ^{[5
]}

Delcourt, M. ^{[5
]}

Heyen, F. ^{[5
]}

Lowette, S. ^{[5
]}

Makarenko, I. ^{[5
]}

Muller, D. ^{[5
]}

Tavernier, S. ^{[5
]}

Tytgat, M. ^{[5
,7
]}

Van Onsem, G. P. ^{[5
]}

Van Putte, S. ^{[5
]}

Vannerom, D. ^{[5
]}

Bilin, B. ^{[6
]}

Clerbaux, B. ^{[6
]}

Das, A. K. ^{[6
]}

De Lentdecker, G. ^{[6
]}

Evard, H. ^{[6
]}

Favart, L. ^{[6
]}

Gianneios, P. ^{[6
]}

Jaramillo, J. ^{[6
]}

Khalilzadeh, A. ^{[6
]}

Khan, F. A. ^{[6
]}

Lee, K. ^{[6
,111
]}

机构：

[1] CERN, Geneva, Switzerland

[2] Yerevan Phys Inst, Yerevan, Armenia

[3] Inst Hochenergiephys, Vienna, Austria

[4] Univ Antwerp, Antwerp, Belgium

[5] Vrije Univ Brussel, Brussels, Belgium

[6] Univ Libre Bruxelles, Brussels, Belgium

[7] Univ Ghent, Ghent, Belgium

[8] Catholic Univ Louvain, Louvain, Belgium

[9] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

[10] Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil

[11] Univ Fed ABC, Univ Estadual Paulista, Sao Paulo, Brazil

[12] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria

[13] Univ Sofia, Sofia, Bulgaria

[14] Univ Tarapaca, Inst Alta Invest, Casilla 7 D, Arica, Chile

[15] Beihang Univ, Beijing, Peoples R China

[16] Tsinghua Univ, Dept Phys, Beijing, Peoples R China

[17] Inst High Energy Phys, Beijing, Peoples R China

[18] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing, Peoples R China

[19] South China Normal Univ, Guangdong Prov Key Lab Nucl Sci, Guangzhou, Peoples R China

[20] South China Normal Univ, Guangdong Hong Kong Joint Lab Quantum Matter, Guangzhou, Peoples R China

[21] Sun Yat Sen Univ, Guangzhou, Peoples R China

[22] Univ Sci & Technol China, Hefei, Peoples R China

[23] Nanjing Normal Univ, Nanjing, Peoples R China

[24] Fudan Univ, Inst Modern Phys, Shanghai, Peoples R China

[25] Fudan Univ, Key Lab Nucl Phys & Ion Beam Applicat MOE, Shanghai, Peoples R China

[26] Zhejiang Univ, Hangzhou, Zhejiang, Peoples R China

[27] Univ Los Andes, Bogota, Colombia

[28] Univ Antioquia, Medellin, Colombia

[29] Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia

[30] Univ Split, Fac Sci, Split, Croatia

[31] Inst Rudjer Boskovic, Zagreb, Croatia

[32] Univ Cyprus, Nicosia, Cyprus

[33] Charles Univ Prague, Prague, Czech Republic

[34] Univ San Francisco Quito, Quito, Ecuador

[35] Acad Sci Res & Technol Arab Republ Egypt, Egyptian Network High Energy Phys, Cairo, Egypt

[36] Fayoum Univ, Ctr High Energy Phys CHEP FU, Al Fayyum, Egypt

[37] NICPB, Tallinn, Estonia

[38] Univ Helsinki, Dept Phys, Helsinki, Finland

[39] Helsinki Inst Phys, Helsinki, Finland

[40] Lappeenranta Lahti Univ Technol, Lappeenranta, Finland

[41] Univ Paris Saclay, CEA, IRFU, Gif Sur Yvette, France

[42] Inst Polytech Paris, Ecole Polytech, IN2P3, Lab Leprince Ringuet,CNRS, Palaiseau, France

[43] Univ Strasbourg, IPHC, CNRS, UMR 7178, Strasbourg, France

[44] IN2P3, Inst Natl Phys Nucl & Phys Particules, CNRS, Ctr Calcul, Villeurbanne, France

[45] Inst Phys 2 Infinis Lyon IP2I, Villeurbanne, France

[46] Georgian Tech Univ, Tbilisi, Georgia

[47] Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany

[48] Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany

[49] Rhein Westfal TH Aachen, Phys Inst B 3, Aachen, Germany

[50] DESY, Hamburg, Germany

来源：

REPORTS ON PROGRESS IN PHYSICS | 2024年 / 87卷 / 11期

基金：

英国科学技术设施理事会; 美国国家科学基金会; 芬兰科学院; 巴西圣保罗研究基金会; 欧洲研究理事会; 欧盟地平线“2020”;

关键词：

CMS; top quark; entanglement; BELLS-INEQUALITY; PLUS PLUS; VIOLATION; SEPARABILITY; THRESHOLD; STATES;

D O I：

10.1088/1361-6633/ad7e4d

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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) over bar) 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) over bar production density matrix and measured in the region of the t (t) over bar 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) over bar pairs in this phase space. This measurement provides a new probe of quantum mechanics at the highest energies ever produced.

引用

页数：33

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