Measurement of branching fractions in radiative B decays to η K γ and search for B decays to η ′ K γ

• Published in: Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2006, Vol.74 (3), Article 031102
• Main Authors: Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Pappagallo, M., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., Stugu, B., Abrams, G. S., Battaglia, M., Brown, D. N., Button-Shafer, J., Cahn, R. N., Charles, E., Day, C. T., Gill, M. S., Groysman, Y., Jacobsen, R. G., Kadyk, J. A., Kerth, L. T., Kolomensky, Yu. G., Kukartsev, G., Lynch, G., Mir, L. M., Oddone, P. J., Orimoto, T. J., Pripstein, M., Roe, N. A., Ronan, M. T., Wenzel, W. A., Barrett, M., Ford, K. E., Harrison, T. J., Hart, A. J., Hawkes, C. M., Morgan, S. E., Watson, A. T., Goetzen, K., Held, T., Koch, H., Lewandowski, B., Pelizaeus, M., Peters, K., Schroeder, T., Steinke, M., Boyd, J. T., Burke, J. P., Cottingham, W. N., Walker, D., Cuhadar-Donszelmann, T., Fulsom, B. G., Hearty, C., Knecht, N. S., Mattison, T. S., McKenna, J. A., Khan, A., Kyberd, P., Saleem, M., Teodorescu, L., Blinov, V. E., Bukin, A. D., Druzhinin, V. P., Golubev, V. B., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu, Best, D. S., Bondioli, M., Bruinsma, M., Chao, M., Curry, S., Eschrich, I., Kirkby, D., Lankford, A. J., Lund, P., Mandelkern, M., Mommsen, R. K., Roethel, W., Stoker, D. P., Abachi, S., Buchanan, C., Foulkes, S. D., Gary, J. W., Long, O., Shen, B. C.
• Format: Article
• Language: English
• Subjects: Experiments; Física de partícules; Particle physics
• ISSN: 1550-7998; 1550-2368
• DOI: 10.1103/PhysRevD.74.031102

We present measurements of the B → η K γ branching fractions and upper limits for the B → η ′ K γ branching fractions. For B + → η K + γ we also measure the time-integrated charge asymmetry. The data sample, collected with the BABAR detector at the Stanford Linear Accelerator Center, represents 232 × 10 6 produced B ¯¯¯ B pairs. The results for branching fractions and upper limits at 90% confidence level in units of 10 − 6 are: B ( B 0 → η K 0 γ ) = 11.3 + 2.8 − 2.6 ± 0.6 , B ( B + → η K + γ ) = 10.0 ± 1.3 ± 0.5 , B ( B 0 → η ′ K 0 γ ) < 6.6 , B ( B + → η ′ K + γ ) < 4.2 . The charge asymmetry in the decay B + → η K + γ is A ch = − 0.09 ± 0.12 ± 0.01 . The first errors are statistical and the second systematic.