Search for vector-like T quarks decaying to top quarks and Higgs bosons in the all-hadronic channel using jet substructure

• Published in: The journal of high energy physics 2015-06, Vol.2015 (6), p.1-48, Article 80
• Main Authors: Kiesenhofer, W., Treberer-Treberspurg, W., Carvalho, W., Cabrera, A., Peltola, T., Salerno, R., Zabi, A., Klein, K., Meyer, A., Teyssier, D., Stahl, A., Garay Garcia, J., Lipka, K., Schoerner-Sadenius, T., Garutti, E., Seidel, M., Giffels, M., Lobelle Pardo, P., Rabbertz, K., Markou, C., Flouris, G., Foudas, C., Malhotra, S., Roy, D., Ganguly, S., Colaleo, A., Pugliese, G., Rossi, A. M., Potenza, R., Civinini, C., Di Guida, S., Dosselli, U., Serban, A. T., Tenchini, R., Tonelli, G., Jorda, C., Argiro, S., Potenza, A., Kim, D. H., Song, S., Goh, J., Hassan, Q., Zalewski, P., Bunin, P., Zarubin, A., Josa, M. I., Pérez-Calero Yzquierdo, A., Di Marco, E., Guida, R., Hegeman, J., Plagge, M., Wollny, H., Pandolfi, F., Pauss, F., Canelli, M. F., Verzetti, M., Seif El Nasr-storey, S., Ferguson, W., Futyan, D., Seez, C., Sharp, P., Hobson, P. R., Scarborough, T., John, J. St, Garabedian, A., Pellett, D., Farrell, C., Rakness, G., Simon, S., Zevi Della Porta, G., Campagnari, C., Gouskos, L., West, C., Yoo, J., Gottschalk, E., Hooberman, B., Joshi, U., Yumiceva, F., Apanasevich, L., Evdokimov, O., Gerber, C. E., Dilsiz, K., Mermerkaya, H., Bolognesi, S., Kaadze, K., Gomez Ceballos, G., Knowlton, D., Zvada, M., Trocino, D., Musienko, Y., Wolfe, H., Werner, J. S., Jung, K., Svyatkovskiy, A., Zablocki, J., Khukhunaishvili, A., Demortier, L., Lee, S. W., Melo, A., Velkovska, J.
• Format: Article
• Language: English
• Subjects: beyond standard model; Classical and Quantum Gravitation; Confidence intervals; Cross sections; Decay; Elementary Particles; Hadron-Hadron Scattering; Higgs bosons; High energy physics; High Energy Physics - Experiment; Marking; Physics; Physics and Astronomy; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Regular Article - Experimental Physics; Relativity Theory; Searching; String Theory; Substructures; top physics
• ISSN: 1029-8479; 1126-6708; 1029-8479
• DOI: 10.1007/JHEP06(2015)080

A bstract A search is performed for a vector-like heavy T quark that is produced in pairs and that decays to a top quark and a Higgs boson. The data analysed correspond to an integrated luminosity of 19.7 fb −1 collected with the CMS detector in proton-proton collisions at s = 8 TeV. For T quarks with large mass values the top quarks and Higgs bosons can have significant Lorentz boosts, so that their individual decay products often overlap and merge. Methods are applied to resolve the substructure of such merged jets. Upper limits on the production cross section of a T quark with mass between 500 and 1000 GeV/ c 2 are derived. If the T quark decays exclusively to tH, the observed (expected) lower limit on the mass of the T quark is 745 (773) GeV/ c 2 at 95% confidence level. For the first time an algorithm is used for tagging boosted Higgs bosons that is based on a combination of jet substructure information and b tagging.