Study of {Upsilon}(3S,2S){yields}{eta}{Upsilon}(1S) and {Upsilon}(3S,2S){yields}{pi}{sup +}{pi}{sup -}{Upsilon}(1S) hadronic transitions

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.092003· OSTI ID:21607995

Lees, J P; Poireau, V; Tisserand, V ^[1]; Garra Tico, J; Grauges, E ^[2]; Martinelli, M; Palano, A; Pappagallo, M ^[3]; Milanes, D A ^[3]; Eigen, G; Stugu, B ^[4]; Brown, D N; Kerth, L T; Kolomensky, Yu G; Lynch, G ^[5]; Koch, H; Schroeder, T ^[6]; Asgeirsson, D J; Hearty, C; Mattison, T S ^[7]

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1. Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Universite de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux (France)
2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
3. INFN Sezione di Bari, I-70126 Bari (Italy)
4. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)
6. Ruhr Universitaet Bochum, Institut fuer Experimentalphysik 1, D-44780 Bochum (Germany)
7. University of British Columbia, Vancouver, British Columbia, V6T 1Z1 (Canada)

We study the {Upsilon}(3S,2S){yields}{eta}{Upsilon}(1S) and {Upsilon}(3S,2S){yields}{pi}{sup +}{pi}{sup -}{Upsilon}(1S) transitions with 122x10{sup 6}{Upsilon}(3S) and 100x10{sup 6}{Upsilon}(2S) mesons collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider. We measure B[{Upsilon}(2S){yields}{eta}{Upsilon}(1S)]=(2.39{+-}0.31(stat.){+-}0.14(syst.))x10{sup -4} and {Gamma}[{Upsilon}(2S){yields}{eta}{Upsilon}(1S)]/{Gamma}[{Upsilon}(2S){yields}{pi}{sup +}{pi}{sup -}{Upsilon}(1S)]=(1.35{+-}0.17(stat.){+-}0.08(syst.))x10{sup -3}. We find no evidence for {Upsilon}(3S){yields}{eta}{Upsilon}(1S) and obtain B[{Upsilon}(3S){yields}{eta}{Upsilon}(1S)]<1.0x10{sup -4} and {Gamma}[{Upsilon}(3S){yields}{eta}{Upsilon}(1S)]/ {Gamma}[{Upsilon}(3S){yields}{pi}{sup +}{pi}{sup -}{Upsilon}(1S)]<2.3x10{sup -3} as upper limits at the 90% confidence level. We also provide improved measurements of the {Upsilon}(2S)-{Upsilon}(1S) and {Upsilon}(3S)-{Upsilon}(1S) mass differences, 562.170{+-}0.007(stat.){+-}0.088(syst.) MeV/c{sup 2} and 893.813{+-}0.015(stat.){+-}0.107(syst.) MeV/c{sup 2}, respectively.

• OSTI ID: 21607995
• Journal Information: Physical Review. D, Particles Fields, Vol. 84, Issue 9; Other Information: DOI: 10.1103/PhysRevD.84.092003; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

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