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arXiv · 1102.4565

Evidence for the h_b(1P) meson in the decay Upsilon(3S) --> pi0 h_b(1P)

The BABAR Collaboration·J. P. Lees·V. Poireau·E. Prencipe·V. Tisserand·J. Garra Tico·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·I. L. Osipenkov·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·H. Jasper·A. Petzold·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
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Abstract

Using a sample of 122 million Upsilon(3S) events recorded with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we search for the $h_b(1P)$ spin-singlet partner of the P-wave chi_{bJ}(1P) states in the sequential decay Upsilon(3S) --> pi0 h_b(1P), h_b(1P) --> gamma eta_b(1S). We observe an excess of events above background in the distribution of the recoil mass against the pi0 at mass 9902 +/- 4(stat.) +/- 2(syst.) MeV/c^2. The width of the observed signal is consistent with experimental resolution, and its significance is 3.1sigma, including systematic uncertainties. We obtain the value (4.3 +/- 1.1(stat.) +/- 0.9(syst.)) x 10^{-4} for the product branching fraction BF(Upsilon(3S)-->pi0 h_b) x BF(h_b-->gamma eta_b).

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The BABAR Collaboration, J. P. Lees, V. Poireau, E. Prencipe, V. Tisserand, J. Garra Tico, 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, I. L. Osipenkov, 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, H. Jasper, A. Petzold, 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. 2011-02-22. Evidence for the h_b(1P) meson in the decay Upsilon(3S) --> pi0 h_b(1P). https://doi.org/10.1103/physrevd.84.091101

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