Bibcode
Khachatryan, V.; 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.; Knünz, V.; König, A.; Krammer, M.; Krätschmer, I.; Liko, D.; Matsushita, T.; Mikulec, I.; Rabady, D.; Rahbaran, B.; Rohringer, H.; Schieck, J.; Schöfbeck, R.; Strauss, J.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Alderweireldt, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Knutsson, A.; Lauwers, J.; Luyckx, S.; Ochesanu, S.; Rougny, R.; 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.; Heracleous, N.; Keaveney, J.; Lowette, S.; Moreels, L.; Olbrechts, A.; Python, Q.; Strom, D.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Van Parijs, I.; Barria, P.; Caillol, C.; Clerbaux, B.; De Lentdecker, G.; Delannoy, H.; Dobur, D.; Fasanella, G.; Favart, L.; Gay, A. P. R.; Grebenyuk, A.; Lenzi, T.; Léonard, A.; Maerschalk, T.; Mohammadi, A.; Perniè, L.; Randle-conde, A.; Reis, T.; Seva, T.; Thomas, L.; Vander Velde, C.; Vanlaer, P.; Wang, J.; Yonamine, R.; Zenoni, F.; Zhang, F.; Beernaert, K.; Benucci, L.; Cimmino, A.; Crucy, S.; Fagot, A.; Garcia, G. et al.
Bibliographical reference
Physical Review D, Volume 93, Issue 1, id.012001
Advertised on:
1
2016
Journal
Citations
97
Refereed citations
79
Description
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 t t
¯ →W b W b 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 t t ¯ 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.