Search for a heavy resonance decaying to a top quark and a vector-like top quark at √s=13 TeV

A. M. Sirunyan, A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, J. Brandstetter, E. Brondolin, M. Dragicevic, J. Erö, M. Flechl, M. Friedl, R. Frühwirth, V. M. Ghete, C. Hartl, N. Hörmann, J. Hrubec, M. Jeitler, A. König, I. Krätschmer, D. Liko & 31 others T. Matsushita, I. Mikulec, D. Rabady, N. Rad, B. Rahbaran, H. Rohringer, J. Schieck, J. Strauss, W. Waltenberger, C. E. Wulz, O. Dvornikov, V. Makarenko, V. Mossolov, J. Suarez Gonzalez, V. Zykunov, N. Shumeiko, S. Alderweireldt, E. A. De Wolf, X. Janssen, J. Lauwers, M. Van De Klundert, H. Van Haevermaet, P. Van Mechelen, N. Van Remortel, A. Van Spilbeeck, S. Abu Zeid, F. Blekman, J. D’Hondt, N. Daci, M. Kadastik, The CMS collaboration

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A search is presented for massive spin-1 Z resonances decaying to a top quark and a heavy vector-like top quark partner T. The search is based on a 2.6 fb−1 sample of proton-proton collisions at 13 TeV collected with the CMS detector at the LHC. The analysis is optimized for final states in which the T quark decays to a W boson and a bottom quark. The focus is on all-jet final states in which both the W boson and the top quark decay into quarks that evolve into jets. The decay products of the top quark and of the W boson are assumed to be highly Lorentz-boosted and cannot be reconstructed as separate jets, but are instead reconstructed as merged, wide jets. Techniques for the identification of jet substructure and jet flavour are used to distinguish signal from background events. Several models for Z bosons decaying to T quarks are excluded at 95% confidence level, with upper limits on the cross section ranging from 0.13 to 10 pb, depending on the chosen hypotheses. This is the first search for a neutral spin-1 heavy resonance decaying to a top quark and a vector-like T quark in the all-hadronic final state.

Original languageEnglish
Article number53
JournalJournal of High Energy Physics
Volume2017
Issue number9
DOIs
Publication statusPublished - Sep 1 2017

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quarks
bosons
decay
protons
substructures
confidence
collisions
detectors
cross sections
products

Keywords

  • Beyond Standard Model
  • Hadron-Hadron scattering (experiments)
  • Top physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., ... The CMS collaboration (2017). Search for a heavy resonance decaying to a top quark and a vector-like top quark at √s=13 TeV. Journal of High Energy Physics, 2017(9), [53]. https://doi.org/10.1007/JHEP09(2017)053

Search for a heavy resonance decaying to a top quark and a vector-like top quark at √s=13 TeV. / Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; 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, C. E.; Dvornikov, O.; Makarenko, V.; Mossolov, V.; Gonzalez, J. Suarez; Zykunov, V.; Shumeiko, N.; Alderweireldt, S.; De Wolf, E. A.; Janssen, X.; Lauwers, J.; Van De Klundert, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Zeid, S. Abu; Blekman, F.; D’Hondt, J.; Daci, N.; Kadastik, M.; The CMS collaboration.

In: Journal of High Energy Physics, Vol. 2017, No. 9, 53, 01.09.2017.

Research output: Contribution to journalArticle

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, Gonzalez, JS, 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, Zeid, SA, Blekman, F, D’Hondt, J, Daci, N, Kadastik, M & The CMS collaboration 2017, 'Search for a heavy resonance decaying to a top quark and a vector-like top quark at √s=13 TeV', Journal of High Energy Physics, vol. 2017, no. 9, 53. https://doi.org/10.1007/JHEP09(2017)053
Sirunyan, A. M. ; Tumasyan, A. ; Adam, W. ; Asilar, E. ; Bergauer, T. ; Brandstetter, J. ; Brondolin, E. ; Dragicevic, M. ; Erö, J. ; Flechl, M. ; Friedl, M. ; Frühwirth, R. ; Ghete, V. M. ; 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, C. E. ; Dvornikov, O. ; Makarenko, V. ; Mossolov, V. ; Gonzalez, J. Suarez ; Zykunov, V. ; Shumeiko, N. ; Alderweireldt, S. ; De Wolf, E. A. ; Janssen, X. ; Lauwers, J. ; Van De Klundert, M. ; Van Haevermaet, H. ; Van Mechelen, P. ; Van Remortel, N. ; Van Spilbeeck, A. ; Zeid, S. Abu ; Blekman, F. ; D’Hondt, J. ; Daci, N. ; Kadastik, M. ; The CMS collaboration. / Search for a heavy resonance decaying to a top quark and a vector-like top quark at √s=13 TeV. In: Journal of High Energy Physics. 2017 ; Vol. 2017, No. 9.
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AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Asilar, E.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Brondolin, E.

AU - Dragicevic, M.

AU - Erö, J.

AU - Flechl, M.

AU - Friedl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hartl, C.

AU - Hörmann, N.

AU - Hrubec, J.

AU - Jeitler, M.

AU - König, A.

AU - Krätschmer, I.

AU - Liko, D.

AU - Matsushita, T.

AU - Mikulec, I.

AU - Rabady, D.

AU - Rad, N.

AU - Rahbaran, B.

AU - Rohringer, H.

AU - Schieck, J.

AU - Strauss, J.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Dvornikov, O.

AU - Makarenko, V.

AU - Mossolov, V.

AU - Gonzalez, J. Suarez

AU - Zykunov, V.

AU - Shumeiko, N.

AU - Alderweireldt, S.

AU - De Wolf, E. A.

AU - Janssen, X.

AU - Lauwers, J.

AU - Van De Klundert, M.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Remortel, N.

AU - Van Spilbeeck, A.

AU - Zeid, S. Abu

AU - Blekman, F.

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N2 - A search is presented for massive spin-1 Z′ resonances decaying to a top quark and a heavy vector-like top quark partner T. The search is based on a 2.6 fb−1 sample of proton-proton collisions at 13 TeV collected with the CMS detector at the LHC. The analysis is optimized for final states in which the T quark decays to a W boson and a bottom quark. The focus is on all-jet final states in which both the W boson and the top quark decay into quarks that evolve into jets. The decay products of the top quark and of the W boson are assumed to be highly Lorentz-boosted and cannot be reconstructed as separate jets, but are instead reconstructed as merged, wide jets. Techniques for the identification of jet substructure and jet flavour are used to distinguish signal from background events. Several models for Z′ bosons decaying to T quarks are excluded at 95% confidence level, with upper limits on the cross section ranging from 0.13 to 10 pb, depending on the chosen hypotheses. This is the first search for a neutral spin-1 heavy resonance decaying to a top quark and a vector-like T quark in the all-hadronic final state.

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KW - Beyond Standard Model

KW - Hadron-Hadron scattering (experiments)

KW - Top physics

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