First observation and branching fraction and decay parameter measurements of the weak radiative decay
Articolo
Data di Pubblicazione:
2007
Abstract:
The weak radiative decay Ξ 0 → Λ e + e − has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of 15 ± 5 events. We determine the branching fraction B ( Ξ 0 → Λ e + e − ) = [ 7.6 ± 0.4 ( stat ) ± 0.4 ( syst ) ± 0.2 ( norm ) ] × 10 −6 , consistent with an internal bremsstrahlung process, and the decay asymmetry parameter α Ξ Λ e e = − 0.8 ± 0.2 , consistent with that of Ξ 0 → Λ γ . The charge conjugate reaction Ξ 0 ¯ → Λ ¯ e + e − has also been observed.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
J. Batley;G. Kalmus;C. Lazzeroni;D. Munday;M. Patel;M. Slater;S. Wotton;R. Arcidiacono;G. Bocquet;A. Ceccucci;D. Cundy;N. Doble;V. Falaleev;L. Gatignon;A. Gonidec;P. Grafström;W. Kubischta;I. Mikulec;A. Norton;B. Panzer-Steindel;P. Rubin;H. Wahl;E. Goudzovski;P. Hristov;V. Kekelidze;L. Litov;D. Madigozhin;N. Molokanova;Y. Potrebenikov;S. Stoynev;A. Zinchenko;E. Monnier;E. Swallow;R. Winston;R. Sacco;A. Walker;W. Baldini;P. Dalpiaz;P. Frabetti;A. Gianoli;M. Martini;F. Petrucci;M. Savrié;M. Scarpa;A. Bizzeti;M. Calvetti;G. Collazuol;E. Iacopini;M. Lenti;G. Ruggiero;M. Veltri;M. Behler;K. Eppard;M. Eppard;A. Hirstius;K. Kleinknecht;U. Koch;P. Marouelli;L. Masetti;U. Moosbrugger;C. M. Morales;A. Peters;R. Wanke;A. Winhart;A. Dabrowski;T. F. Martin;M. Velasco;G. Anzivino;P. Cenci;E. Imbergamo;G. Lamanna;P. Lubrano;A. Michetti;A. Nappi;M. Pepe;M. Petrucci;M. Piccini;M. Valdata;C. Cerri;F. Costantini;R. Fantechi;L. Fiorini;S. Giudici;I. Mannelli;G. Pierazzini;M. Sozzi;C. Cheshkov;J. Cheze;M. D. Beer;P. Debu;G. Gouge;G. Marel;E. Mazzucato;B. Peyaud;B. Vallage;M. Holder;A. Maier;M. Ziolkowski;C. Biino;N. Cartiglia;M. Clemencic;S. G. Lopez;F. Marchetto;E. Menichetti;N. Pastrone;W. Wislicki;H. Dibon;M. Jeitler;M. Markytan;G. Neuhofer;L. Widhalm
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