Search for the Decay D⁰ → γγ and Measurement of the Branching Fraction for D⁰ → π⁰π⁰

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Search for the Decay D⁰ → γγ and Measurement of the Branching Fraction for D⁰ → π⁰π⁰

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title Search for the Decay D⁰ → γγ and Measurement of the Branching Fraction for D⁰ → π⁰π⁰
contributor.author Lees, J. P.
contributor.author Poireau, V.
contributor.author Prencipe, E.
contributor.author Tisserand, V.
contributor.author Garra Tico, J.
contributor.author Grauges, E.
contributor.author Martinelli, M.
contributor.author Izen, Joseph M.
contributor.author Lou, Xinchou
contributor.author BaBar Collaboration
contributor.utdAuthor Lou, Xinchou
contributor.utdAuthor Izen, Joseph M.
contributor.VIAF 250674117 (Izen, JM)
contributor.VIAF 250674117 (Izen, JM)
description.abstract We search for the rare decay of the D⁰ meson to two photons, D⁰ → γγ, and present a measurement of the branching fraction for a D⁰ meson decaying to two neutral pions, B(D⁰ → π⁰π⁰). The data sample analyzed corresponds to an integrated luminosity of 470.5 fb⁻¹ collected by the BABAR detector at the PEP-II asymmetric-energy e⁺e⁻ collider at SLAC. We place an upper limit on the branching fraction, B(D⁰ → γγ) < 2.2 × 10⁻⁶ at 90% confidence level. This limit improves on the existing limit by an order of magnitude. We also find B(D⁰→π⁰π⁰) = (8.4 ± 0.1 ± 0.4 ± 0.3) × 10⁻⁴.
identifier.issn 1550-7998
identifier.uri http://hdl.handle.net/10735.1/3077
identifier.volume 85
identifier.issue 9
subject Particles (Nuclear physics)
subject Astrophysics
date.created 2012-05-18
date.issued 2012-05-18
publisher American Physical Society
relation.uri http://dx.doi.org/10.1103/PhysRevD.85.091107
rights © 2012 American Physical Society
language.iso en_US
source Physical Review D - Particles, Fields, Gravitation and Cosmology

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