Search for the Standard Model Higgs boson in the decay channel H->ZZ()->4l with 4.8 fb-1 of pp collisions at sqrt(s)=7 TeV with ATLAS

• Published in: Physics letters. B 2012, Vol.710, p.383-402
• Main Authors: Aad, G., Aperio Bella, L., Aubert, B., Berger, N., Colas, J., Delmastro, M., Di Ciaccio, L., Doan, T.K.O., Elles, S., Goy, C., Helary, L., Hryn'Ova, T., Jérémie, A., Jézéquel, S., Kataoka, M., Labbe, J., Lafaye, R., Leveque, J., Lombardo, V.P., Massol, N., Perrodo, P., Petit, E., Przysiezniak, H., Richter-Was, E., Sauvage, G., Sauvan, E., Schwoerer, M., Todorov, T., Tsionou, D., Wingerter-Seez, I., Zitoun, R., Zolnierowski, Y., Biscarat, C., Cogneras, E., Rahal, G., Boumediene, D., Busato, Emmanuel, Calvet, D., Calvet, S., Camacho Toro, Reina Coromoto, Cinca, Diane, Donini, J., Febbraro, R., Ghodbane, N., Guicheney, C., Liao, H., Pallin, D., Podlyski, F., Santoni, C., Says, L. P., Vazeille, F., Abdel Khalek, S., Abreu, H., Andari, N., Arnault, C., Augé, E., Barrillon, P., Benoit, M., Binet, S., Bourdarios, C., Collard, C., de La Taille, C., de Vivie de Regie, J.B., Duflot, L., Escalier, M., Fayard, L., Fournier, D., Grivaz, J.-F., Henrot-Versillé, S., Hrivnac, J., Iconomidou-Fayard, L., Idarraga, J., Kado, M., Lorenzo Martinez, N., Lounis, A., Makovec, N., Matricon, P., Niedercorn, F., Poggioli, L., Puzo, P., Renaud, A., Rousseau, D., Rybkin, G., Sauvan, J.B., Schaarschmidt, J., Schaffer, A.C., Scifo, E., Serin, L., Simion, S., Tanaka, R., Teinturier, M., Veillet, J.J., Vukotic, I., Wicek, F., Zerwas, D., Zhang, Zhiqing, Albrand, S., Andrieux, M.L., Buat, Q., Clement, B.
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 0370-2693
• DOI: 10.1016/j.physletb.2012.03.005

This Letter presents a search for the Standard Model Higgs boson in the decay channel H->ZZ(*)->l+l-l'+l'-, where l,l'=e or mu, using proton-proton collisions at sqrt(s)=7 TeV recorded with the ATLAS detector and corresponding to an integrated luminosity of 4.8 fb^-1. The four-lepton mass distribution is compared with Standard Model background expectations to derive upper limits on the cross section of a Standard Model Higgs boson with a mass between 110 GeV and 600 GeV which exclude the mass ranges 134-156 GeV, 182-233 GeV, 256-265 GeV and 266-415 GeV at the 95% confidence level. The largest upward deviations from the background-only hypothesis are observed for Higgs boson masses of 125, 244 and 500 GeV with local significances of 2.1, 2.2 and 2.1 standard deviations, respectively. Once the look-elsewhere effect is considered, none of these excesses are significant.