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Evidence for the h_b(1P) meson in the decay Y(3S) → π^0h_b(1P)

Lees, J. P. and Cheng, C. H. and Doll, D. A. and Echenard, B. and Flood, K. T. and Hitlin, D. G. and Ongmongkolkul, P. and Porter, F. C. and Rakitin, A. Y. (2011) Evidence for the h_b(1P) meson in the decay Y(3S) → π^0h_b(1P). Physical Review D, 84 (9). Art. No. 091101. ISSN 2470-0010.

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Using a sample of 122×10^6 Υ(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 χ_(bJ)(1P) states in the sequential decay Υ(3S)→π^0h_b(1P), hb(1P)→γη_b(1S). We observe an excess of events above background in the distribution of the recoil mass against the π0 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 3.1σ, including systematic uncertainties. We obtain the value (4.3±1.1(stat)±0.9(syst))×10^(-4) for the product branching fraction B(Υ(3S)→π^0h_b)×B(h_b→γη_b).

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Additional Information:© 2011 American Physical Society. Received 22 February 2011; published 8 November 2011. 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), MICIIN (Spain), STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union), the A. P. Sloan Foundation (USA) and the Binational Science Foundation (USA-Israel).
Funding AgencyGrant Number
Department of Energy (DOE) UNSPECIFIED
FOM (The Netherlands)UNSPECIFIED
Marie Curie EIF (European Union)UNSPECIFIED
A.P. Sloan FoundationUNSPECIFIED
Binational Science Foundation (USA-Israel)UNSPECIFIED
Issue or Number:9
Classification Code:PACS: 13.20.Gd, 13.25.Gv, 14.40.Pq, 14.65.Fy
Record Number:CaltechAUTHORS:20120109-112336215
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Official Citation:Evidence for the hb(1P) meson in the decay Υ(3S)→π0hb(1P) J. P. Lees et al. (The BABAR Collaboration) Published 8 November 2011 (8 pages) 091101(R)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28713
Deposited By: Ruth Sustaita
Deposited On:10 Jan 2012 15:50
Last Modified:03 Oct 2019 03:35

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