Evidence for spin one resonance production in the reaction gamma gamma* ---> pi+ pi- pi0 pi0 - INSPIRE

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Evidence for spin one resonance production in the reaction gamma gamma* ---> pi+ pi- pi0 pi0

TPC/Two Gamma

Collaboration

•

Daniel A. Bauer

Mar, 1993

34 pages

Published in:

Phys.Rev.D 48 (1993) 3976-3987

DOI:

10.1103/PhysRevD.48.3976

PDG:

{{\mathit f}_{{{1}}}{(1510)}}

Report number:

SLAC-PUB-6094,
UCSB-HEP-93-02

Experiments:

SLAC-PEP-004

View in:

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Abstract: (APS)

Using data from the TPC/Two-Gamma experiment at the SLAC e+e− storage ring PEP, a C=+1 resonance has been observed in the π+π−π0γ final state resulting from the fusion of one nearly real and one quite virtual photon. The actual decay channel is probably π+π−π0π0, where one final-state photon is not detected, and the mass of the fully reconstructed state would be approximately 1525 MeV. A four-pion decay mode in turn implies that the resonance has even isospin. The nonobservation of this R(1525) when both initial-state photons are nearly real suggests a spin-1 assignment. Since the large measured value of the product of the branching ratio into π+π−π0π0 and the γγ coupling makes it unlikely that this state is the mostly s¯s f1(1510), its interpretation may lie outside of conventional meson spectroscopy. There is a second, less-significant enhancement observed in the same reaction at a four-pion mass centered around 2020 MeV.

electron positron: colliding beams
colliding beams: electron positron
exchange: two-photon
two-photon: exchange
photon photon: interaction
interaction: photon photon
meson resonance: photoproduction
photoproduction: meson resonance
meson resonance: (1525)
(1525): meson resonance

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