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Title: Improved limits on B0 decays to invisible (+γ) final states
Author: Garra Ticó, Jordi
Graugés Pous, Eugeni
BABAR Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 27-Sep-2012
Publisher: American Physical Society
Abstract: We establish improved upper limits on branching fractions for B 0 decays to final states where the decay products are purely invisible (i.e., no observable final state particles) and for final states where the only visible product is a photon. Within the Standard Model, these decays have branching fractions that are below the current experimental sensitivity, but various models of physics beyond the Standard Model predict significant contributions for these channels. Using 471 × 10 6 B ¯¯¯ B pairs collected at the Υ ( 4 S ) resonance by the BABAR experiment at the PEP-II e + e − storage ring at the SLAC National Accelerator Laboratory, we establish upper limits at the 90% confidence level of 2.4 × 10 − 5 for the branching fraction of B 0 → invisible and 1.7 × 10 − 5 for the branching fraction of B 0 → invisible + γ .
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2012, vol. 86, num. 5, p. 051105(R)
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ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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