New data on the [ital K[bar K]] threshold region and the nature of the [ital f][sub 0]([ital S][sup *])

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.1185· OSTI ID:6189086

Morgan, D ^[1]; Pennington, M R ^[2]

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1. Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 OQX (United Kingdom)
2. Centre for Particle Theory, University of Durham, Durham, DH1 3LE (United Kingdom)

We combine new data on [ital f][sub 0]([ital S][sup *]) production in [ital J]/[psi] and [ital D][sub [ital s]] decays with earlier information on central production and elastic [pi][pi], [ital K[bar K]] processes to make a fresh examination of the [ital f][sub 0]([ital S][sup *]) resonance. The key feature of our amplitude analysis is its strict enforcement of unitarity. This allows the good energy resolution of the new [ital J]/[psi][r arrow][phi][pi][pi]([ital K[bar K]]) data to play its full role in delineating the [ital f][sub 0]([ital S][sup *]) resonance structure that experiment demands. This enables us to distinguish alternative resonance mechanisms that have been proposed: we conclude that [ital f][sub 0]([ital S][sup *]) is most probably not a [ital K[bar K]] molecule, nor an amalgam of two resonances, but a conventional Breit-Wigner-like structure. In this preferred description, the [ital f][sub 0]([ital S][sup *]) has rather a narrow width ([Gamma][sub 0][similar to]52 MeV) and comparable couplings to [pi][pi] and [ital K[bar K]]. Possible spectroscopic interpretations are considered.

• OSTI ID: 6189086
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 48:3; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
BOSONS
BREIT-WIGNER FORMULA
CHARMONIUM
DECAY
ELEMENTARY PARTICLES
F0-975 MESONS
HADRONS
J PSI-3097 MESONS
KAONS
MESONS
PARTICLE DECAY
PARTICLE PROPERTIES
PARTICLE WIDTHS
PHI-1020 MESONS
PIONS
PSEUDOSCALAR MESONS
QUARKONIUM
SCALAR MESONS
SCATTERING AMPLITUDES
STRANGE MESONS
STRANGE PARTICLES
STRANGEONIUM
UNITARITY
VECTOR MESONS
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY