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Evidence for the η_b(1S) Meson in Radiative Υ(2S) Decay

Aubert, B. and Bona, M. and Karyotakis, Y. and Lees , J. P. and Poireau, V. and Prencipe, E. and Prudent, X. and Tisserand, V. and Garra Tico, J. and Grauges, E. and Lopez, L. and Palano, A. and Pappagallo, M. and Eigen, G. and Stugu, B. and Sun, L. and Battaglia, M. and Brown, D. N. and Kerth, L. T. and Kolomensky, Yu. G. and Lynch, G. and Osipenkov, I. L. and Tackmann, K. and Tanabe, T. and Hawkes, C. M. and Soni, N. and Watson, A. T. and Koch, H. and Schroeder , T. and Asgeirsson, D. J. and Fulsom, B. G. and Hearty, C. and Mattison, T. S. and McKenna, J. A. and Barrett, M. and Khan, A. and Randle-Conde, A. and Blinov, V. E. and Bukin, A. D. and Buzykaev, A. R. and Druzhinin, V. P. and Golubev, V. B. and Onuchin, A. P. and Serednyakov, S. I. and Skovpen, Yu. I. and Solodov, E. P. and Todyshev, K. Yu. and Bondioli, M. and Curry, S. and Eschrich, I. and Kirkby, D. and Lankford , A. J. and Lund, P. and Mandelkern, M. and Martin, E. C. and Stoker, D. 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C. and Bianchi, F. and Gamba, D. and Pelliccioni, M. and Bomben, M. and Bosisio, L. and Cartaro, C. and Della Ricca, G. and Lanceri, L. and Vitale, L. and Azzolini, V. and Lopez-March, N. and Martinez-Vidal, F. and Milanes, D. A. and Oyanguren, A. and Albert, J. and Banerjee, Sw. and Bhuyan, B. and Choi, H. H. F. and Hamano, K. and King, G. J. and Kowalewski, R. and Lewczuk, M. J. and Nugent, I. M. and Roney, J. M. and Sobie, R. J. and Gershon, T. J. and Harrison, P. F. and Ilic, J. and Latham, T. E. and Mohanty, G. B. and Puccio, E. M. T. and Band, H. R. and Chen, X. and Dasu, S. and Flood, K. T. and Pan, Y. and Prepost, R. and Vuosalo, C. O. and Wu, S. L. (2009) Evidence for the η_b(1S) Meson in Radiative Υ(2S) Decay. Physical Review Letters, 103 (16). p. 161801. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:20091109-101316262

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Abstract

We have performed a search for the η_b(1S) meson in the radiative decay of the Υ(2S) resonance using a sample of 91.6 × 10^6 Υ(2S) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at E_γ = 609.3^(+4.6)_(-4.5)(stat)±1.9(syst) MeV, corresponding to an η_b(1S) mass of 9394.2^(+4.8)_(-4.9)(stat) ± 2.0(syst) MeV/c^2. The branching fraction for the decay Υ(2S) → γη_b(1S) is determined to be [3.9 ± 1.1(stat)^(+1.1)_(-0.9)(syst)] × 10^(-4). We find the ratio of branching fractions B[Υ(2S) → γη_b(1S)]/B[Υ(3S) → γη_b(1S)]= 0.82 ± 0.24(stat)^(+0.20)_(-0.19)(syst).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.103.161801DOIArticle
http://link.aps.org/doi/10.1103/PhysRevLett.103.161801PublisherArticle
Additional Information:© 2009 American Physical Society. Received 6 March 2009; published 15 October 2009. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.
Funders:
Funding AgencyGrant Number
Stanford Linear Accelerator CenterUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Ministry of Education and Science of the Russian Federation UNSPECIFIED
Ministerio de Educación y Ciencia (MEC)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)UNSPECIFIED
Issue or Number:16
Classification Code:PACS numbers: 13.20.Gd, 14.40.Gx, 14.65.Fy
Record Number:CaltechAUTHORS:20091109-101316262
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20091109-101316262
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16623
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:16 Nov 2009 22:38
Last Modified:16 Sep 2019 20:51

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