The χb states in exclusive radiative decay of the Υ(2S)
Creators
- Walk, W.1, 2
- Koenig, A.C.1, 2
- Metzger, W.J.1, 2
- Schotanus, J.1, 2
- Walle, R.T. van de1, 2
- Antreasyan, D.3
- Irion, J.3
- Strauch, K.3
- Williams, D.3
- Aschman, D.4
- Besset, D.5
- Cabenda, R.5
- Cavalli-Sforza, M.5
- Cowan, R.5
- Coyne, D.5
- Newman-Holmes, C.5
- Bloom, E.D.6, 7
- Clare, R.6, 7
- Cooper, S.6, 7
- Fridman, A.6, 7
- Gaiser, J.6, 7
- Gelphman, D.6, 7
- Godfrey, G.6, 7
- Hofstadter, R.6, 7
- Kirkbride, I.6, 7
- Lee, R.6, 7
- Leffler, S.6, 7
- Litke, A.M.6, 7
- Lockman, W.6, 7
- Lowe, S.6, 7
- Matsui, T.6, 7
- Niczyporuk, B.6, 7
- Pollock, B.6, 7
- Schwarz, A.6, 7
- Tompkins, J.6, 7
- Wacker, K.6, 7
- Brock, I.8
- Engler, A.8
- Kraemer, R.W.8
- Marlow, D.8
- Messing, F.8
- Prindle, D.8
- Renger, B.8
- Rippich, C.8
- Vogel, H.8
- Cartacci, A.9, 10
- Conforto, G.9, 10
- Monteleoni, B.9, 10
- Pelfer, P.G.9, 10
- Edwards, C.11
- Peck, C.11
- Porter, F.C.11
- Ratoff, P.11
- Folger, G.12
- Lurz, B.12
- Volland, U.12
- Wegner, H.12
- Heimlich, F.H.13
- Lekebusch, R.13
- Lezoch, P.13
- Maschmann, W.13
- Nernst, R.13
- Sievers, D.13
- Strohbusch, U.13
- Jakubowski, Z.14
- Nowak, G.14
- Keh, S.15
- Kilian, H.15
- Koenigsmann, K.15
- Scheer, M.15
- Schmitt, P.15
- Trost, H.J.4, 16
- Zschorsch, P.
- Bienlein, J.K.
- Kloiber, T.
- Koch, W.
- Schmitz, M.
- Skwarnicki, T.
- Crystal Ball Collaboration
- 1. Nationaal Inst. voor Kernfysica en Hoge-Energiefysica (NIKHEF), Nijmegen (Netherlands)
- 2. Katholieke Univ. Nijmegen (Netherlands)
- 3. Harvard Univ., Cambridge, MA (USA)
- 4. Cape Town Univ. (South Africa)
- 5. Princeton Univ., NJ (USA)
- 6. Stanford Linear Accelerator Center, CA (USA)
- 7. Stanford Univ., CA (USA). Dept. of Physics
- 8. Carnegie-Mellon Univ., Pittsburgh, PA (USA)
- 9. Florence Univ. (Italy)
- 10. Istituto Nazionale di Fisica Nucleare, Florence (Italy)
- 11. California Inst. of Tech., Pasadena (USA)
- 12. Erlangen-Nuernberg Univ., Erlangen (Germany, F.R.)
- 13. Hamburg Univ. (Germany, F.R.). 1. Inst. fuer Experimentalphysik
- 14. Institute of Nuclear Physics, Krakow (Poland)
- 15. Wuerzburg Univ. (Germany, F.R.)
- 16. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.)
Description
The Crystal Ball detector at DORIS II has been used to study radiative decays of the Υ(2S) resonance. We report on the analysis of the exclusive channel Υ(2S) → γχb, χb → γΥ(1S) → e+e- or μ+μ-. We detect two χb states by observing two monochromatic photon lines at energies (107.0 ± 1.1 ± 1.3) MeV and (131.7 ± 0.9 ± 1.3) MeV respectively. The product branching ratios BR [Υ(2S) → γχb] x BR [χb → γΥ(1S)] are (1.6 ± 0.3 ± 0.2)% for the first state and (2.1 ± 0.3 ± 0.3)% for the second. For the product branching ratio of the third χb state, which has been observed in inclusive measurements, we find an upper limit of 0.2% (90% C.L.). Combining our results with inclusive measurements, branching ratios for χb → γΥ(1S) are derived. Using theoretical estimates for the radiative widths of the χb states, we determine their hadronic widths; the results are compared with QCD predictions. (orig.)
Availability note (English)
MF available from INIS under the Report Number.
Files
Additional details
Publishing Information
- Imprint Pagination
- 36 p.
- Report number
- DESY--85-019
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 18059412
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANNIHILATION; BRANCHING RATIO; EFFECTIVE MASS; ELECTRON-POSITRON INTERACTIONS; ELECTRONS; ENERGY SPECTRA; EXCLUSIVE INTERACTIONS; EXPERIMENTAL DATA; GAMMA SPECTRA; GEV RANGE 10-100; HADRONIC PARTICLE DECAY; LEPTONIC DECAY; MASS SPECTRA; MUONS MINUS; MUONS PLUS; M1-TRANSITIONS; PAIR PRODUCTION; PARTICLE WIDTHS; PHOTONS; POSITRONS; PSEUDOSCALAR MESONS; RADIATIVE DECAY; UPSILON-10000 RESONANCES; UPSILON-9500 RESONANCES
- Descriptors DEC
- ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BASIC INTERACTIONS; BOSONS; DATA; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; FERMIONS; GEV RANGE; HADRONS; INFORMATION; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; LEPTONS; MASS; MASSLESS PARTICLES; MATTER; MESON RESONANCES; MESONS; MULTIPOLE TRANSITIONS; MUONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; RESONANCE PARTICLES; SPECTRA; UPSILON RESONANCES; VECTOR MESONS; WEAK INTERACTIONS; WEAK PARTICLE DECAY
Optional Information
- Contract/Grant/Project number
- Contract DE-AC03-81ER40050; DE-AC02-76ER03066; DE-AC02-76ER03064; DE-AC02-76ER03072; DE-AC03-76SF00515; DE-AC03-76SF00326; Grant PHY-75-22980; PHY-81-07396; PHY-82-08761
- Collaborations
- Crystal Ball Collaboration.
- Secondary number(s)
- SLAC-PUB--3820.