Measurement of the jet width in $\gamma \gamma$ collisions and in $e^{+} e^{-}$ annihilation process at TRISTAN

The shape of jets produced in (quasi-) real photon-photon collisions as well as in e^+e^- annihilation process has been studied with a cone jet finding algorithm, using the data taken with the TOPAZ detector at the TRISTAN e^+e^- collider at an average center-of-mass energy of 58 GeV. The results are presented in terms of the jet width as a function of the jet transverse energy(E^{jet}_T) as well as a scaled transverse jet energy, x_T(=2E^{jet}_T/root(s)). The jet width narrows as E^{jet}_T increases; however, at the same value of E^{jet}_T the jet width in gamma-gamma collisions at TRISTAN is significantly narrower than that in gamma p collisions at HERA. By comparing our results with the data in other reactions, it has been shown that the jet width in gamma-gamma, gamma p, p\bar{p} collisions as well as the e^+e^- annihilation process has an approximate scaling behavior as a function of x_T.

Note:

Revised version •
19 pages, 5 figures, To be apeared in Phys. Lett. B. Only report-no is corrected Report-no: KEK Preprint 98-208

electron positron: colliding beams
electron positron: annihilation
exchange: two-photon
photon photon: interaction
photon: resolved
jet: photoproduction
jet: width
transverse energy: dependence
scaling
transverse energy: energy flow

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Figures(0)

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