Observation of four top quark production in proton-proton collisions at √s=13 TeV

被引：35

作者：

Hayrapetyan, A. ^{[2
]}

Tumasyan, A. ^{[2
,206
]}

Adam, W. ^{[3
]}

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

Bergauer, T. ^{[3
]}

Chatterjee, S. ^{[3
,62
]}

Damanakis, K. ^{[3
]}

Dragicevic, M. ^{[3
]}

Del Valle, A. Escalante ^{[3
]}

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

Jeitler, M. ^{[3
,207
]}

Krammer, N. ^{[3
]}

Liko, D. ^{[3
]}

Mikulec, I. ^{[3
]}

Schieck, J. ^{[3
,207
]}

Schoefbeck, R. ^{[3
]}

Schwarz, D. ^{[3
]}

Sonawane, M. ^{[3
]}

Templ, S. ^{[3
]}

Waltenberger, W. ^{[3
]}

Wulz, C. -E. ^{[3
,207
]}

Darwish, M. R. ^{[4
,208
]}

Janssen, T. ^{[4
]}

Van Mechelen, P. ^{[4
]}

Bols, E. S. ^{[5
]}

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

Dansana, S. ^{[5
]}

De Moor, A. ^{[5
]}

Delcourt, M. ^{[5
]}

El Faham, H. ^{[5
]}

Lowette, S. ^{[5
]}

Makarenko, I. ^{[5
]}

Muller, D. ^{[5
]}

Sahasransu, A. R. ^{[5
]}

Tavernier, S. ^{[5
]}

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

Van Putte, S. ^{[5
]}

Vannerom, D. ^{[5
]}

Clerbaux, B. ^{[6
]}

De Lentdecker, G. ^{[6
]}

Favart, L. ^{[6
]}

Hohov, D. ^{[6
]}

Jaramillo, J. ^{[6
]}

Khalilzadeh, A. ^{[6
]}

Lee, K. ^{[6
,108
]}

Mahdavikhorrami, M. ^{[6
]}

Malara, A. ^{[6
]}

Paredes, S. ^{[6
]}

Petre, L. ^{[6
]}

Postiau, N. ^{[6
]}

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] Sun Yat Sen Univ, Guangzhou, Peoples R China

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

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

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

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

[24] Univ Los Andes, Bogota, Colombia

[25] Univ Antioquia, Medellin, Colombia

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

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

[28] Inst Rudjer Boskovic, Zagreb, Croatia

[29] Univ Cyprus, Nicosia, Cyprus

[30] Charles Univ Prague, Prague, Czech Republic

[31] Escuela Politec Nacl, Quito, Ecuador

[32] Univ San Francisco Quito, Quito, Ecuador

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

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

[35] NICPB, Tallinn, Estonia

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

[37] Helsinki Inst Phys, Helsinki, Finland

[38] Lappeenranta Lahti Univ Technol, Lappeenranta, Finland

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

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

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

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

[43] Georgian Tech Univ, Tbilisi, Georgia

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

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

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

[47] DESY, Hamburg, Germany

[48] Univ Hamburg, Hamburg, Germany

[49] Karlsruher Inst Technol, Karlsruhe, Germany

[50] NCSR Demokritos, Inst Nucl & Particle Phys INPP, Aghia Paraskevi, Greece

来源：

PHYSICS LETTERS B | 2023年 / 847卷

关键词：

CMS; Top quark; SGLUONS; DECAY;

D O I：

10.1016/j.physletb.2023.138290

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016-2018 at the CERN LHC and corresponding to an integrated luminosity of 138 fb-1. Events with two same-sign, three, or four charged leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels, updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis. Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is measured to be 17.7+3.7-3.5 (stat)+2.3-1.9 (syst) fb, in agreement with the available standard model predictions.

引用

页数：32

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