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Search for anomalous tt¯ production in the highly-boosted all-hadronic final stat

Abstract: A search is presented for a massive particle, generically referred to as a Z?, decaying into a tt¯tt¯ pair. The search focuses on Z? resonances that are sufficiently massive to produce highly Lorentz-boosted top quarks, which yield collimated decay products that are partially or fully merged into single jets. The analysis uses new methods to analyze jet substructure, providing suppression of the non-top multijet backgrounds. The analysis is based on a data sample of proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 5 fb?1. Upper limits in the range of 1 pb are set on the product of the production cross section and branching fraction for a topcolor Z? modeled for several widths, as well as for a Randall-Sundrum Kaluza-Klein gluon. In addition, the result contrain any enhancement in tt¯tt¯ production beyond expectations of the standard mode for tt invariant mass larger than 1 TeV/c 2.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hammer J., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Krammer M., Liko D., Mikulec I., Pernicka M., Rahbaran B., Rohringer C., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Teischinger F., Wagner P., Waltenberger W., Walzel G., Widl E., Wulz C.E., Mossolov V., Shumei

 Fuente: Journal of High Energy Physics 29 (2012)

Editorial: Springer Verlag

 Año de publicación: 2012

Nº de páginas: 41

Tipo de publicación: Artículo de Revista

 DOI: 10.1007/JHEP09(2012)029

ISSN: 1126-6708,1029-8479

Url de la publicación: https://doi.org/10.1007/JHEP09(2012)029

Autores/as

SHANHUEI CHUANG

MARTA FELCINI

CLARA JORDA LOPE

PATRICIA LOBELLE PARDO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO

MARIA DEL MAR SOBRON SAÑUDO