A search is performed for the production of heavy resonances decaying into top-antitop quark pairs in proton-proton collisions at s√=8  TeV. Data used for the analyses were collected with the CMS detector and correspond to an integrated luminosity of 19.7  fb−1. The search is performed using events with three different final states, defined by the number of leptons (electrons and muons) from the tt¯→WbWb decay. The analyses are optimized for reconstruction of top quarks with high Lorentz boosts, where jet substructure techniques are used to enhance the sensitivity. Results are presented for all channels and a combination is performed. No significant excess of events relative to the expected yield from standard model processes is observed. Upper limits on the production cross section of heavy resonances decaying to tt¯ are calculated. A narrow leptophobic topcolor Z′ resonance with a mass below 2.4 TeV is excluded at 95% confidence level. Limits are also derived for a broad Z′ resonance with a 10% width relative to the resonance mass, and a Kaluza-Klein excitation of the gluon in the Randall-Sundrum model. These are the most stringent limits to date on heavy resonances decaying into top-antitop quark pairs.

Khachatryan, V., Sirunyan, A. .m., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). Search for resonant tt¯production in proton-proton collisions at sqrt(s)=8  TeV. PHYSICAL REVIEW D, 93(1), 1-35 [10.1103/PhysRevD.93.012001].

Search for resonant tt¯production in proton-proton collisions at sqrt(s)=8  TeV

BATTILANA, CARLO;BONACORSI, DANIELE;BRAIBANT, SYLVIE;BRIGLIADORI, LUCA;CAMPANINI, RENATO;CAPILUPPI, PAOLO;CASTRO, ANDREA;CODISPOTI, GIUSEPPE;CUFFIANI, MARCO;FANFANI, ALESSANDRA;FASANELLA, DANIELE;GUIDUCCI, LUIGI;MASETTI, GIANNI;NAVARRIA, FRANCESCO LUIGI;ROSSI, ANTONIO MARIA;ROVELLI, TIZIANO;SIROLI, GIAN PIERO;
2016

Abstract

A search is performed for the production of heavy resonances decaying into top-antitop quark pairs in proton-proton collisions at s√=8  TeV. Data used for the analyses were collected with the CMS detector and correspond to an integrated luminosity of 19.7  fb−1. The search is performed using events with three different final states, defined by the number of leptons (electrons and muons) from the tt¯→WbWb decay. The analyses are optimized for reconstruction of top quarks with high Lorentz boosts, where jet substructure techniques are used to enhance the sensitivity. Results are presented for all channels and a combination is performed. No significant excess of events relative to the expected yield from standard model processes is observed. Upper limits on the production cross section of heavy resonances decaying to tt¯ are calculated. A narrow leptophobic topcolor Z′ resonance with a mass below 2.4 TeV is excluded at 95% confidence level. Limits are also derived for a broad Z′ resonance with a 10% width relative to the resonance mass, and a Kaluza-Klein excitation of the gluon in the Randall-Sundrum model. These are the most stringent limits to date on heavy resonances decaying into top-antitop quark pairs.
2016
Khachatryan, V., Sirunyan, A. .m., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). Search for resonant tt¯production in proton-proton collisions at sqrt(s)=8  TeV. PHYSICAL REVIEW D, 93(1), 1-35 [10.1103/PhysRevD.93.012001].
Khachatryan, V.; Sirunyan, A.  . m.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flech...espandi
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/542410
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 34
  • ???jsp.display-item.citation.isi??? 28
social impact