Search for narrow quarkonium states and pair production of new heavy quarks at C.M. energies from 33.0 to 36.7 GeV
Creators
- 1. Karlsruhe Univ. (TH) (Germany, F.R.)
- 2. Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.)
Description
The total e+e- annihilation cross section into hadrons has been measured at c.m. energies between 33.00 and 36.72 GeV in steps of 20 MeV. The average ratio R = sigma(e+e- → hadrons)/sigmasub(μ)sub(μ) = 3.85 +- 0.12 (stat.) +- 0.31 (syst.) is consistent with the quark-parton model expectation for coloured u, d, s, c, and b quarks. For a narrow Jsup(P) = l- quarkonium state of a hypothetical t quark of charge 2/3 e, we find an upper limit GAMMAsub(e)sub(e) x GAMMAsub(had)/GAMMAsub(tot) < 2.2 keV at 95% c.l.. The observed number of aplanar final states excludes a contribution to R of 4/3 from a new quark with a mass between 6 and 16.5 GeV, and a contribution of 1/3 for quark masses between 9 and 16.5 GeV. (orig.)
Availability note (English)
MF available from INIS under the Report Number.
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Additional details
Publishing Information
- Imprint Pagination
- 7 p.
- Report number
- DESY--81/029
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 13649508
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANNIHILATION; BRANCHING RATIO; ELECTROMAGNETIC PARTICLE DECAY; ELECTRON-POSITRON INTERACTIONS; EXPERIMENTAL DATA; GEV RANGE 10-100; HADRONIC PARTICLE DECAY; HADRONS; LIMITING VALUES; PARTICLE WIDTHS; TOTAL CROSS SECTIONS; VECTOR MESONS
- Descriptors DEC
- BOSONS; CROSS SECTIONS; DATA; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; GEV RANGE; INFORMATION; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; MESON RESONANCES; MESONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; RESONANCE PARTICLES