A Search for the Decay B^0 -> gamma gamma
| Autor: | The BABAR Collaboration, al, P. del Amo Sanchez et |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Phys.Rev.D83:032006,2011 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.83.032006 |
| Popis: | We report the result of a search for the rare decay B^0 -> gamma gamma in 426 fb-1 of data, corresponding to 226 million B^0 \bar{B}^0 pairs, collected on the Upsilon(4S) resonance at the PEP-II asymmetric-energy e+e- collider using the BABAR detector. We use a maximum likelihood fit to extract the signal yield and observe 21^{+13}_{-12} signal events with statistical significance of 1.9 sigma. This corresponds to a branching fraction B(B^0 -> gamma gamma) = (1.7 +- 1.1(stat.) +- 0.2(syst.)) x 10^-7. Based on this result, we set a 90% confidence level upper limit of B(B^0 -> gamma gamma) < 3.3 x 10^-7. Comment: 13 pages, 5 figures, 1 Table, submitted to Phys. Rev. D |
| Databáze: | arXiv |
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