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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2001, vol. 87, p. 2418031-2418037

Search for the decay B0 → γγ

Aubert B., Boutigny D., Gaillard J. M., Hicheur A., Karyotakis Y., Lees J. P., Robbe P., Tisserand V., Palano A., Chen G. P., Chen J. C., Qi N. D., Rong G., Wang P., Zhu Y. S., Eigen G., Reinertsen P. L., Stugu B., Abbott B., Abrams G. S., Borgland A. W., Breon A. B., Brown D. N., Button-Shafer J., Cahn R. N., Clark A. R., Gill M. S., Gritsan A., Groysman Y., Jacobsen R. G., Kadel R. W., Kadyk J., Kerth L. T., Kluth S., Kolomensky Y. G., Kral J. F., LeClerc C., Levi M. E., Liu T., Lynch G., Meyer A. B., Momayezi M., Oddone P. J., Perazzo A., Pripstein M., Roe N. A., Romosan A., Ronan M. T., Shelkov V. G., Telnov A. V., Wenzel W. A., Bright-Thomas P. G., Harrison T. J., Hawkes C. M., Knowles D. J., O'Neale S. W., Penny R. C., Watson A. T., Watson N. K., Deppermann T., Goetzen K., Koch H., Krug J., Kunze M., Lewandowski B., Peters K., Schmuecker H., Steinke M., Andress J. C., Barlow N. R., Bhimji W., Chevalier N., Clark P. J., Cottingham W. N., de Groot N., Dyce N., Foster B., McFall J. D., Wallom D., Wilson F. F., Abe K., Hearty C., Mattison T. S., McKenna J. A., Thiessen D., Jolly S., McKemey A. K., Tinslay J., Blinov V. E., Bukin A. D., Bukin D. A., Buzykaev A. R., Golubev V. B., Ivanchenko V. N., Korol A. A., Kravchenko E. A., Onuchin A. P., Salnikov A. A., Serednyakov S. I., Skovpen Y. I.

A limit on the branching fraction for the decay Bo→γγ was presented using data collected at the γ(4S) resonance at the PEP-II asymmetric energy collider. The energy resolution was measured with a radioactive source at low energy and with electrons from Bhabha scattering at high energy. The energy deposits were reconstructed by grouping adjacent crystals with energy deposits greater than 1 MeV into clusters.