A Study of Pion Pair Production in Two Photon Process

Adachi, I.; Doser, M.; Enomoto, R.; Fujii, H.; Fujii, K.; Fujii, T.; Fujimoto, J.; Fujiwara, K.; Fujiwara, N.; Hayashii, H.

doi:10.1016/0370-2693(90)92026-F

A Study of Pion Pair Production in Two Photon Process

TOPAZ

Collaboration

Nov, 1989

6 pages

Published in:

Phys.Lett.B 234 (1990) 185-190

Published: 1990

DOI:

10.1016/0370-2693(90)92026-F

PDG:

{{\mathit f}_{{{2}}}{(1270)}}

\rightarrow

{{\mathit \gamma}}{{\mathit \gamma}}

Report number:

KEK-Preprint-89-156,
DPNU-89-58,
KOBE-HEP-89-12,
TU-HEP-89-04,
UT-HE-89/09,
OCU-HEP-89-05,
INS-792,
NWU-HEP-89-05,
TUAT-HEP-89-04,
PU-89-641

Experiments:

KEK-TE-002

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Abstract: (Elsevier)

We studied the e + e − →e + e − π + π − interaction with the untagged two-photon sample obtained by the TOPAZ detector at the TRISTAN e + e − collider. The sample was taken in the energy region s =55.0−60.8 GeV . One of the QED backgrounds, e + e − →e + e − , was clearly removed by the measurement of d E /d x by the TOPAZ-TPC. The π + π − invariant mass spectrum is well reproduced by the f 2 (1270) resonance, the Born term and their interference. We determined the radiative width of the f 2 (1270) to be 2.27±0.47(stat.)±0.11(syst.) keV.

electron positron: colliding beams
electron positron: inelastic scattering
exchange: two-photon
photon photon: exclusive reaction
pi: electroproduction
mass spectrum: (pi+ pi-)
quantum electrodynamics: background
f2(1270): width
Born approximation
TOPAZ

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