A measurement of the total hadronic cross-section in tagged $\gamma\gamma$ reactions

Aihara, H.; Alston-Garnjost, M.; Avery, R.E.; Barker, A.R.; Bauer, Daniel A.; Bay, A.; Belcinski, R.; Bingham, H.H.; Bloom, Elliott D.; Buchanan, C.D.

doi:10.1103/PhysRevD.41.2667

A measurement of the total hadronic cross-section in tagged $\gamma\gamma$ reactions

TPC/Two Gamma

Collaboration

Sep, 1989

28 pages

Published in:

Phys.Rev.D 41 (1990) 2667

DOI:

10.1103/PhysRevD.41.2667

Report number:

SLAC-PUB-5101,
UC-IIRPA-89-02

Experiments:

SLAC-PEP-004

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Abstract: (APS)

We present a measurement of the total cross section for γγ→hadrons, with one photon quasireal and the other a spacelike photon of mass squared −Q2. Results are presented as a function of Q2 and the γγ center-of-mass energy W, with the Q2 range extending from 0.2 to 60 GeV2, and W in the range from 2 to 10 GeV. The data were taken with the TPC/Two-Gamma facility at the SLAC e+e− storage ring PEP, which was operated at a beam energy of 14.5 GeV. The cross section exhibits a gentle falloff with increasing W. Its Q2 dependence is shown to be well described by an incoherent sum of vector-meson and pointlike scattering over most of the observed W range. Agreement at high Q2 is improved if a minimum-pT cutoff (motivated by QCD) is imposed on the pointlike contribution.

electron positron: colliding beams
colliding beams: electron positron
electron positron: inelastic scattering
inelastic scattering: electron positron
exchange: two-photon
two-photon: exchange
photon photon: inclusive reaction
hadron: electroproduction
electroproduction: hadron
hadron: multiple production

References(12)

Figures(0)

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A measurement of the total hadronic cross-section in tagged γγ\gamma\gammaγγ reactions

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A measurement of the total hadronic cross-section in tagged $\gamma\gamma$ reactions