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 04:00:00 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, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 84; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ASYMMETRY
BOSONS
DECAY
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
ETA MESONS
FERMIONS
HADRONS
LEPTONS
MASS DIFFERENCE
MATTER
MESONS
MEV RANGE
PARTICLE DECAY
PARTICLE PROPERTIES
PHOSPHOENOLPYRUVATE
PIONS
PIONS MINUS
PIONS PLUS
POSITRONS
PSEUDOSCALAR MESONS
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WEAK HADRONIC DECAY
WEAK PARTICLE DECAY