Search for a Supersymmetric Partner to the Top Quark in Final States with Jets and Missing Transverse Momentum at s = 7 TeV with the ATLAS Detector

A search for direct pair production of supersymmetric top squarks ($ \tilde{t} $1) is presented, assuming the $ \tilde{t} $1 decays into a top quark and the lightest supersymmetric particle, $ \tilde{χ}$$ 0\atop{1} $, and that both top quarks decay to purely hadronic final states. A total of 16 (4)...

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Veröffentlicht in:	Physical review letters 2012-11, Vol.109 (21)
Hauptverfasser:	Amor Dos Santos, S. P., Blocki, J., Boek, J., Bogdanchikov, A., Boisvert, V., Boyd, J., Caprini, I., Castro, N. F., Cheplakov, A., Chizhov, M. V., Cortiana, G., Davey, W., de Mora, L., Dell’Asta, L., Desch, K., Dotti, A., Duda, D., Einsweiler, K., Ernst, M., Ertel, E., Fatholahzadeh, B., Filipčič, A., Franz, S., Grinstein, S., Guler, H., Hall, D., Hamilton, S., Hansen, P. H., Heim, S., Hillert, S., Hines, E., Jakobs, K., Jarlskog, G., Jia, J., Jones, R. W. L., Kalinin, S., Kawamoto, T., Konstantinidis, N., Kruker, T., Kuleshov, S., Laforge, B., LeCompte, T., Lehmacher, M., Leontsinis, S., Liberti, B., Lundberg, O., Lungwitz, M., Maeno, T., Maleev, V. P., Mapelli, A., March, L., McCarthy, R. L., Mermod, P., Metcalfe, J., Micu, L., Möser, N., Morettini, P., Munwes, Y., Nozka, L., O’Brien, B. J., O’Shea, V., Orestano, D., Palmer, J. D., Pecsy, M., Pleier, M. -A., Plotnikova, E., Radloff, P., Rador, T., Rajagopalan, S., Renaud, A., Rescigno, M., Rybar, M., Salt, J., Sandoval, T., Savinov, V., Schnoor, U., Severini, H., Shupe, M. A., Silbert, O., Sjölin, J., Stoerig, K., Takeshita, T., Tassi, E., Teischinger, F. A., Thoma, S., Thomsen, L. A., Unno, Y., Valero, A., Viel, S., Vranjes Milosavljevic, M., Waller, P., Warburton, A., Wells, P. S., Weng, Z., Wetter, J., Wielers, M., Wilson, M. G., Winklmeier, F., Wrona, B., Zoccoli, A.
Format:	Artikel
Sprache:	eng
Schlagworte:	PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Zusammenfassung:	A search for direct pair production of supersymmetric top squarks ($ \tilde{t} $1) is presented, assuming the $ \tilde{t} $1 decays into a top quark and the lightest supersymmetric particle, $ \tilde{χ}$$ 0\atop{1} $, and that both top quarks decay to purely hadronic final states. A total of 16 (4) events are observed compared to a predicted standard model background of 13.5$ +3.7\atop{-3.6} $(4.4$ +1.7\atop{-1.3} $) events in two signal regions based on ∫ Ldt=4.7 fb-1 of pp collision data taken at $ \sqrt{s}$=7 TeV with the ATLAS detector at the LHC. An exclusion region in the $ \tilde{t} $1 versus $ \tilde{χ}$$ 0\atop{1} $ mass plane is evaluated: 370 < m$ \tilde{t} $1 < 465 GeV is excluded for m$ \tilde{χ}$$ 0\atop{1} $ ∼ 0 GeV while m$ \tilde{t} $1 = 445 GeV is excluded for m$ \tilde{χ}$$ 0\atop{1} $ ≤ 50 GeV.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.109.211802