| Title: | Observation of four top quark production in proton-proton collisions at √s = 13 TeV |
| Other Titles: | Observation of four top quark production in proton-proton collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo linebreak="goodbreak" linebreakstyle="after">=</mml:mo><mml:mn>13</mml:mn><mml:mspace width="0.2em" /><mml:mtext>TeV</mml:mtext></mml:math> |
| Authors: | Hayrapetyan, A
Tumasyan, A
Adam, W
Andrejkovic, JW
Bergauer, T
Chatterjee, S
Damanakis, K
Dragicevic, M
Escalante Del Valle, A
Hussain, PS
Jeitler, M
Xie, W
Ille, B
Collura, G
Oh, G
Amendola, C
Ozek, B
Laurila, S
Caminada, L
Aziz, T
Orfanelli, S
Muhammad, A
Lee, H
Wang, Q
Xiao, M
Dewanjee, RK
Defranchis, MM
Hadjiiska, R
Latino, G
Pilipovic, D
Roy, T
Rudrabhatla, S
Dorsett, A
Morris, M
Pazzini, J
Gritsan, AV
Pata, J
Akchurin, N
Estevez Banos, LI
Tonjes, MB
Appelt, E
Pitt, M
You, Z
Incandela, J
Le Bihan, A-C
Greene, S
McCauley, T
Mao, J
Gurrola, A
Chahal, GS
Dancu, JS
Beirão Da Cruz E Silva, C
Lu, N
Ojalvo, I
Orimoto, T
Clare, R
Boimska, B
Johns, W
Maity, D
Wen, Y
Marinelli, N
Kunnawalkam Elayavalli, R
Dutta, S
Berryhill, J
Terrill, W
Malik, S
Chen, HS
de Trocóniz, JF
Melo, A
Mieskolainen, M
Jaramillo, J
Aimè, C
Romeo, F
Nguyen, V
Viliani, L
Benitez, JF
Iaydjiev, P
Li, YY
Sheldon, P
Acharya, H
Tuo, S
Velkovska, J
León Coello, M
Wichmann, K
Uniyal, R
Abbaneo, D
Portales, L
Raidal, M
Seidel, M
Karasavvas, D
Donegà, M
Zhu, RY
Chatzistavrou, T
Padula, SS
Viinikainen, J
Bryant, P
Gilbert, A
Cardwell, B
Dodonova, A
Malawski, M
Benussi, L
Kovac, M
Mal, P
Pantaleo, F
Adamov, G
Górski, M
Cox, B
Palmer, C
Mans, J
Das, I
Claes, DR
Perrotta, A
Di Florio, A
Hakala, J
Hirosky, R
Ledovskoy, A
Merlin, JA
Li, A
Vargas Hernandez, AM
Ghezzi, A
Lecoq, P
Piparo, D
Araujo, M
Bandyopadhyay, H
Chauhan, S
Calderon De La Barca Sanchez, M
Yoo, J
Neu, C
Corcodilos, L
Popescu, S
Bragagnolo, A
Hill, C
Gecse, Z
Lange, D
Richman, J
Arcaro, D
Eich, N
Perez Lara, CE
Rehm, F
Karchin, PE
Huh, C
Alhusseini, M
Mishra, T
Saka, H
Castells, S
Brainerd, C
Bärtschi, P
Tani, L
Aravind, A
Radogna, R
Walter, D
Jafari, A
Pak, SI
Wolf, R
Strologas, J
Lu, R-S
Salyer, K
Leutgeb, E
Winer, BL
Bhat, PC
Mcgrady, C
Blend, D
Reitenspiess, T
Kazana, M
Banerjee, S
Chudasama, R
Paganis, E
Black, K
Tishelman-Charny, A
Theofilatos, K
Szillasi, Z
Bose, T
Choi, S
Petrucciani, G
Dasu, S
Bianco, S
Reid, ID
Psallidas, A
Sarica, U
Kim, HS
Rogan, C
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Maggi, G
Rankin, D
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Mohrman, K
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Siviero, F
Dreimanis, K
Campagnari, C
Khan, A
Evdokimov, O
Lassila-Perini, K
Migliorini, M
Gerber, CE
Hohov, D
D'Alessandro, R
Kole, G
Hofman, DJ
Grenier, G
Verma, S
Sánchez Navas, S
Marchese, L
Yuan, L
Li, D
Lee, JH
Godinovic, N
Knight, M
Kansal, R
Lemos, DS
Wang, J
De Roeck, A
Hegeman, J
Eckstein, D
Bauerdick, LAT
Merrit, AH
Bansal, S
Mills, C
Focardi, E
Bauer, G
Diekmann, S
Martin Perez, C
Sorrentino, G
Bhattacharya, S
Nanda, S
Choudhary, BC
Zolkapli, Z
Berry, D
Walsh, R
Uribe Estrada, C |
| Keywords: | CMS;top quark |
| Issue Date: | 31-Oct-2023 |
| Publisher: | Elsevier |
| Citation: | A. Hayrapetyan, A. Tumasyan. et al. for the CMS Collaboration (2023) 'Observation of four top quark production in proton-proton collisions at √s = 13 TeV', Physics Letters B, 847, 138290, pp. 1 - 49. doi: 10.1016/j.physletb.2023.138290. |
| Abstract: | 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. |
| Description: | Data availability: Will be supplied with proofs.
A preprint of this article was made available on arXiv, arXiv:2305.13439 [hep-ex]. The preprint was replaced with the published version. All the figures and tables can be found at: http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-22-013 (CMS Public Pages).
Report number: CMS-TOP-22-013, CERN-EP-2023-090 |
| URI: | https://bura.brunel.ac.uk/handle/2438/27936 |
| DOI: | https://doi.org/10.1016/j.physletb.2023.138290 |
| ISSN: | 0370-2693 |
| Other Identifiers: | ORCID iD: Joanne E. Cole https://orcid.org/0000-0001-5638-7599
ORCID iD: Akram Khan https://orcid.org/0000-0002-4597-4402
ORCID iD: Paul Kyberd https://orcid.org/0000-0002-7353-7090
ORCID iD: Ivan D. Reid https://orcid.org/0000-0002-9235-779X
138290 |
| Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers
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