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Search for D-0 -> gamma gamma and improved measurement of the branching fraction for D-0 -> pi(0)pi(0)
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2015 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 91, no 11, article id 112015Article in journal (Refereed) Published
Abstract [en]

Using 2.92 fb(-1) of electron-positron annihilation data collected at root s = 3.773 GeV with the BESIII detector, we report the results of a search for the flavor-changing neutral current process D-0 -> gamma gamma using a double-tag technique. We find no signal and set an upper limit at 90% confidence level for the branching fraction of B(D-0 -> gamma gamma < 3.8 x 10(-6). We also investigate D-0-meson decay into two neutral pions, obtaining a branching fraction of B(D-0 -> pi(0)pi(0)) = (8.24 +/- 0.21(stat) +/- 0.30(syst)) x 10(-4), the most precise measurement to date and consistent with the current world average.

Place, publisher, year, edition, pages
2015. Vol. 91, no 11, article id 112015
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Physical Sciences
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URN: urn:nbn:se:uu:diva-258766DOI: 10.1103/PhysRevD.91.112015ISI: 000356928900002OAI: oai:DiVA.org:uu-258766DiVA, id: diva2:842504
Available from: 2015-07-20 Created: 2015-07-20 Last updated: 2017-12-04Bibliographically approved

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Johansson, TordKupsc, AndrzejPettersson, JoachimSchönning, KarinWolke, Magnus

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