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Search for standard model production of four top quarks in proton–proton collisions at s=13 TeV

Journal articles  - Journal Article
Sirunyan, AM; Tumasyan, A; Adam, W; Asilar, E; Bergauer, T; Brandstetter, J; Brondolin, E; Dragicevic, M; Erö, J; Flechl, M; Friedl, M; Rad, N ...
Published in: Physics Letters Section B Nuclear Elementary Particle and High Energy Physics
September 10, 2017
Published version (DOI)

A search for events containing four top quarks (tt¯tt¯) is reported from proton–proton collisions recorded by the CMS experiment at s=13 TeV and corresponding to an integrated luminosity of 2.6 fb−1. The analysis considers the single-lepton (e or μ)+jets and the opposite-sign dilepton (μ+μ−, μ±e∓, or e+e−)+jets channels. It uses boosted decision trees to combine information on the global event and jet properties to distinguish between tt¯tt¯ and tt¯ production. The number of events observed after all selection requirements is consistent with expectations from background and standard model signal predictions, and an upper limit is set on the cross section for tt¯tt¯ production in the standard model of 94 fb at 95% confidence level (10.2 × the prediction), with an expected limit of 118 fb. This is combined with the results from the published CMS search in the same-sign dilepton channel, resulting in an improved limit of 69 fb at 95% confidence level (7.4 × the prediction), with an expected limit of 71 fb. These are the strongest constraints on the rate of tt¯tt¯ production to date.

Duke Scholars

Seog Oh
Author Seog Oh Physics
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Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

10.1016/j.physletb.2017.06.064

ISSN

0370-2693

Publication Date

September 10, 2017

Volume

772

Start / End Page

336 / 358

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
 

Citation

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Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., … Bondu, O. (2017). Search for standard model production of four top quarks in proton–proton collisions at s=13 TeV. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 772, 336–358. https://doi.org/10.1016/j.physletb.2017.06.064
Sirunyan, A. M., A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, J. Brandstetter, E. Brondolin, et al. “Search for standard model production of four top quarks in proton–proton collisions at s=13 TeV.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 772 (September 10, 2017): 336–58. https://doi.org/10.1016/j.physletb.2017.06.064.
Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, et al. Search for standard model production of four top quarks in proton–proton collisions at s=13 TeV. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2017 Sep 10;772:336–58.
Sirunyan, A. M., et al. “Search for standard model production of four top quarks in proton–proton collisions at s=13 TeV.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, vol. 772, Sept. 2017, pp. 336–58. Scopus, doi:10.1016/j.physletb.2017.06.064.
Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Erö J, Flechl M, Friedl M, Frühwirth R, Ghete VM, Hartl C, Hörmann N, Hrubec J, Jeitler M, König A, Krätschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz CE, Dvornikov O, Makarenko V, Mossolov V, Suarez Gonzalez J, Zykunov V, Shumeiko N, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D’Hondt J, Daci N, De Bruyn I, Deroover K, Lontkovskyi D, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Léonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Vander Velde C, Vanlaer P, Vannerom D, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Salva S, Schöfbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O. Search for standard model production of four top quarks in proton–proton collisions at s=13 TeV. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2017 Sep 10;772:336–358.
Journal cover image

Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

10.1016/j.physletb.2017.06.064

ISSN

0370-2693

Publication Date

September 10, 2017

Volume

772

Start / End Page

336 / 358

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences