Model-independent search for the decay B + → l + ν l γ

• Published in: Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2009-12, Vol.80 (11), Article 111105
• Main Authors: Aubert, B., Karyotakis, Y., Lees, J. P., Poireau, V., Prencipe, E., Prudent, X., Tisserand, V., Tico, J. Garra, Grauges, E., Martinelli, M., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Sun, L., Battaglia, M., Brown, D. N., Kerth, L. T., Kolomensky, Yu. G., Lynch, G., Osipenkov, I. L., Tackmann, K., Tanabe, T., Hawkes, C. M., Soni, N., Watson, A. T., Koch, H., Schroeder, T., Asgeirsson, D. J., Fulsom, B. G., Hearty, C., Mattison, T. S., McKenna, J. A., Barrett, M., Khan, A., Randle-Conde, A., Blinov, V. E., Bukin, A. D., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu, Bondioli, M., Curry, S., Eschrich, I., Kirkby, D., Lankford, A. J., Lund, P., Mandelkern, M., Martin, E. C., Stoker, D. P., Atmacan, H., Gary, J. W., Liu, F., Long, O., Vitug, G. M., Yasin, Z., Sharma, V., Campagnari, C., Hong, T. M., Kovalskyi, D., Mazur, M. A., Richman, J. D., Beck, T. W., Eisner, A. M., Heusch, C. A., Kroseberg, J., Lockman, W. S., Martinez, A. J., Schalk, T., Schumm, B. A., Seiden, A., Wang, L., Winstrom, L. O., Cheng, C. H., Doll, D. A., Echenard, B., Fang, F., Hitlin, D. G., Narsky, I., Ongmongkolkul, P., Piatenko, T., Porter, F. C., Andreassen, R., Mancinelli, G., Meadows, B. T., Mishra, K., Sokoloff, M. D., Bloom, P. C., Ford, W. T., Gaz, A., Hirschauer, J. F., Nagel, M., Nauenberg, U., Smith, J. G., Wagner, S. R.
• Format: Article
• Language: English
• Subjects: Experiments; Física de partícules; Particle physics
• ISSN: 1550-7998; 1550-2368
• DOI: 10.1103/PhysRevD.80.111105

We present a search for the radiative leptonic decay B + → ℓ + ν ℓ γ , where ℓ = e , μ , using a data sample of 465 × 10 6 B ¯¯¯ B pairs collected by the BABAR experiment. In this analysis, we fully reconstruct the hadronic decay of one of the B mesons in Υ ( 4 S ) → B + B − decays, then search for evidence of B + → ℓ + ν ℓ γ in the rest of the event. We observe no significant evidence of signal decays and report model-independent branching fraction upper limits of B ( B + → e + ν e γ ) < 17 × 10 − 6 , B ( B + → μ + ν μ γ ) < 24 × 10 − 6 , and B ( B + → ℓ + ν ℓ γ ) < 15.6 × 10 − 6 ( ℓ = e or μ ), all at the 90% confidence level.