Sensitive search for resonances in low-energy e sup + e minus scattering

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.3955· OSTI ID:7183861

Hallin, A L; Calaprice, F P; McPherson, R A; Saettler, E R.J. ^[1]

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1. Physics Department, Princeton University, Princeton, New Jersey 08544 (United States)

We have searched for resonances in {ital e}{sup +}{ital e{minus}} scattering in a range of positron kinetic energies from 1.9 to 2.5 MeV (1.75--1.88 MeV invariant energy). Such resonances would exist if the anomalous electron-positron pairs observed in heavy-ion collisions were due to two-body decay of a neutral object. Our 97% confidence limit excludes resonances with an energy-integrated cross section greater than 0.3 to 2.4 b eV/sr, depending upon the incident positron energy. For scalar resonances, this corresponds to a lower limit of the lifetime that varies from 8{times}10{sup {minus}14} to 5{times}10{sup {minus}13} sec. These are the most sensitive limits to date.

• OSTI ID: 7183861
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:11; ISSN 0556-2821; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

662220 -- Quantum Electrodynamics-- (1992-)
662310* -- Weak & Electromagnetic Interactions of Leptons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BEAMS
BHABHA SCATTERING
COINCIDENCE METHODS
COINCIDENCE SPECTROMETRY
COUNTING TECHNIQUES
CROSS SECTIONS
DATA
ELASTIC SCATTERING
ELECTRODYNAMICS
ELECTRON-POSITRON INTERACTIONS
ENERGY RANGE
EXPERIMENTAL DATA
FIELD THEORIES
INELASTIC SCATTERING
INFORMATION
INTERACTIONS
LEPTON BEAMS
LEPTON-LEPTON INTERACTIONS
LIFETIME
MEV RANGE
MEV RANGE 01-10
NUMERICAL DATA
PARTICLE BEAMS
PARTICLE INTERACTIONS
POSITRON BEAMS
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY
RESONANCE SCATTERING
SCATTERING