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arXiv · 1104.5254

Study of radiative bottomonium transitions using converted photons

The BABAR Collaboration·J. P. Lees·V. Poireau·E. Prencipe·V. Tisserand·J. GarraTico·E. Grauges·M. Martinelli·D. A. Milanes·A. Palano·M. Pappagallo·G. Eigen·B. Stugu·L. Sun·D. N. Brown·L. T. Kerth·Yu. G. Kolomensky·G. Lynch·H. Koch·T. Schroeder·D. J. Asgeirsson·C. Hearty·T. S. Mattison·J. A. McKenna·A. Khan·V. E. Blinov·A. R. Buzykaev·V. P. Druzhinin·V. B. Golubev·E. A. Kravchenko·A. P. Onuchin·S. I. Serednyakov·Yu. I. Skovpen·E. P. Solodov·K. Yu. Todyshev·A. N. Yushkov·M. Bondioli·S. Curry·D. Kirkby·A. J. Lankford·M. Mandelkern·D. P. Stoker·H. Atmacan·J. W. Gary·F. Liu·O. Long·G. M. Vitug·C. Campagnari·T. M. Hong·D. Kovalskyi·J. D. Richman·C. A. West·A. M. Eisner·J. Kroseberg·W. S. Lockman·A. J. Martinez·T. Schalk·B. A. Schumm·A. Seiden·C. H. Cheng·D. A. Doll·B. Echenard·K. T. Flood·D. G. Hitlin·P. Ongmongkolkul·F. C. Porter·A. Y. Rakitin·R. Andreassen·M. S. Dubrovin·B. T. Meadows·M. D. Sokoloff·P. C. Bloom·W. T. Ford·A. Gaz·M. Nagel·U. Nauenberg·J. G. Smith·S. R. Wagner·R. Ayad·W. H. Toki·B. Spaan·M. J. Kobel·K. R. Schubert·R. Schwierz·D. Bernard·M. Verderi·P. J. Clark·S. Playfer·J. E. Watson·D. Bettoni·C. Bozzi·R. Calabrese·G. Cibinetto·E. Fioravanti·I. Garzia·E. Luppi·M. Munerato·M. Negrini·L. Piemontese·R. Baldini-Ferroli
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Abstract

We use 111+/-1 million Upsilon(3S) and 89+/-1 million Upsilon(2S) events recorded by the BaBar detector at the PEP-II B-factory at SLAC to perform a study of radiative transitions between bottomonium states using photons that have been converted to e+e- pairs by the detector material. We observe Upsilon(3S) -> gamma chi_b0,2(1P) decay, make precise measurements of the branching fractions for chi_b1,2(1P,2P) -> gamma Upsilon(1S) and chi_b1,2(2P) -> gamma Upsilon(2S) decays, and search for radiative decay to the eta_b(1S) and eta_b(2S) states.

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The BABAR Collaboration, J. P. Lees, V. Poireau, E. Prencipe, V. Tisserand, J. GarraTico, E. Grauges, M. Martinelli, D. A. Milanes, A. Palano, M. Pappagallo, G. Eigen, B. Stugu, L. Sun, D. N. Brown, L. T. Kerth, Yu. G. Kolomensky, G. Lynch, H. Koch, T. Schroeder, D. J. Asgeirsson, C. Hearty, T. S. Mattison, J. A. McKenna, A. Khan, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, V. B. Golubev, E. A. Kravchenko, A. P. Onuchin, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, K. Yu. Todyshev, A. N. Yushkov, M. Bondioli, S. Curry, D. Kirkby, A. J. Lankford, M. Mandelkern, D. P. Stoker, H. Atmacan, J. W. Gary, F. Liu, O. Long, G. M. Vitug, C. Campagnari, T. M. Hong, D. Kovalskyi, J. D. Richman, C. A. West, A. M. Eisner, J. Kroseberg, W. S. Lockman, A. J. Martinez, T. Schalk, B. A. Schumm, A. Seiden, C. H. Cheng, D. A. Doll, B. Echenard, K. T. Flood, D. G. Hitlin, P. Ongmongkolkul, F. C. Porter, A. Y. Rakitin, R. Andreassen, M. S. Dubrovin, B. T. Meadows, M. D. Sokoloff, P. C. Bloom, W. T. Ford, A. Gaz, M. Nagel, U. Nauenberg, J. G. Smith, S. R. Wagner, R. Ayad, W. H. Toki, B. Spaan, M. J. Kobel, K. R. Schubert, R. Schwierz, D. Bernard, M. Verderi, P. J. Clark, S. Playfer, J. E. Watson, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Fioravanti, I. Garzia, E. Luppi, M. Munerato, M. Negrini, L. Piemontese, R. Baldini-Ferroli. 2011-04-27. Study of radiative bottomonium transitions using converted photons. https://doi.org/10.1103/physrevd.84.072002

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