CERN Accelerating science

Article
Report number	hep-ex/0401019
Title	Measurements of Six-Body Hadronic Decays of the $D^0$ Charmed Meson
Author(s)	Link, J M ; Yager, P M ; Anjos, J C ; Bediaga, I ; Göbel, C ; Machado, A A ; Magnin, J ; Massafferri, A ; De Miranda, J M ; Pepe, I M ; Polycarpo, E ; Dos Reis, A C ; Carrillo, S ; Casimiro, E ; Cuautle, E ; Sánchez-Hernández, A ; Uribe, C ; Vázquez, F ; Agostino, L ; Cinquini, L ; Cumalat, J P ; O'Reilly, B ; Segoni, I ; Butler, J N ; Cheung, H W K ; Chiodini, G ; Gaines, I ; Garbincius, P H ; Garren, L A ; Gottschalk, E ; Kasper, P H ; Kreymer, A E ; Kutschke, R ; Wang, M ; Benussi, L ; Bertani, M ; Bianco, S ; Fabbri, Franco Luigi ; Zallo, A ; Reyes, M ; Cawlfield, C ; Kim, D Y ; Rahimi, A ; Wiss, J ; Gardner, R ; Kryemadhi, A ; Chung, Y S ; Kang, J S ; Ko, B R ; Kwak, J W ; Lee, K B ; Cho, K ; Park, H ; Alimonti, G ; Barberis, S ; Boschini, M ; Cerutti, A ; D'Angelo, P ; Di Corato, M ; Dini, P ; Edera, L ; Erba, S ; Giammarchi, M ; Inzani, P ; Leveraro, F ; Malvezzi, S ; Menasce, D ; Mezzadri, M ; Moroni, L ; Pedrini, D ; Pontoglio, C ; Prelz, F ; Rovere, M ; Sala, S ; Davenport, T F ; Arena, V ; Boca, G ; Bonomi, G ; Gianini, G ; Liguori, G ; Merlo, M M ; Pantea, D ; Lopes-Pegna, D ; Ratti, S P ; Riccardi, C ; Vitulo, P ; Hernández, H ; López, A M ; Luiggi, E ; Méndez, H ; Paris, A ; Ramírez, J E ; Zhang, Y ; Wilson, J R ; Handler, T ; Mitchell, R ; Bryant, A D ; Engh, D ; Hosack, M ; Johns, W E ; Nehring, M ; Sheldon, P D ; Stenson, K ; Vaandering, E W ; Webster, M ; Sheaff, M
Publication	2004
Imprint	14 Jan 2004
In:	Phys. Lett. B 586 (2004) 21-26
DOI	10.1016/j.physletb.2004.02.038
Subject category	Particle Physics - Experiment
Abstract	Using data collected by the FOCUS experiment at Fermilab, we report the discovery of the decay modes D^0 --> K- pi+ pi+ pi+ pi- pi- and D^0 --> pi+ pi+ pi+ pi- pi- pi-. With a sample of 48 +/- 10 reconstructed D^0 --> K- pi+ pi+ pi+ pi- pi- decays and 149 +/- 17 reconstructed D^0 --> pi+ pi+ pi+ pi- pi- pi- decays, we measure the following relative branching ratios: ${\Gamma (D^0 \to K^- \pi^+ \pi^+ \pi^+ \pi^- \pi^-) / \Gamma (D^0 \to K^- \pi^+ \pi^+ \pi^-)} = (2.70 \pm 0.58 \pm 0.38) \times 10^{-3}$ ${\Gamma (D^0 \to \pi^+ \pi^+ \pi^+ \pi^- \pi^- \pi^-) / \Gamma (D^0 \to K^- \pi^+ \pi^+ \pi^-)} = (5.23 \pm 0.59 \pm 1.35) \times 10^{-3}$ ${\Gamma (D^0 \to \pi^+ \pi^+ \pi^+ \pi^- \pi^- \pi^-) / \Gamma (D^0 \to K^- \pi^+ \pi^+ \pi^+ \pi^- \pi^-)} = 1.93 \pm 0.47 \pm 0.48$ The first errors are statistical and the second are systematic. The branching fraction of the Cabibbo suppressed six-body decay mode is measured to be a factor of two higher than the branching fraction of the Cabibbo favored six-body decay mode.

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