Inclusive Photon Production From P(P)Over-Bar Collisions At Root-S = 1.8 Tev

PHYSICAL REVIEW LETTERS(1993)

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摘要
We report a measurement of the inclusive production of low-energy photons from ppBAR collisions at square-root s = 1.8 TeV. A NaI calorimeter located near eta = 0 was used to measure the photon transverse momentum spectrum over the range 30 less-than-or-equal-to p(t) less-than-or-equal-to 5000 MeV/c. The data are compared to the photon production expected from known particle decays in an attempt to isolate a low-energy direct photon signal. We find no evidence for excess photons above those expected from hadron decays and place an upper limit of 16% (90% C.L.) on any excess direct photons in the p(t) range from 30 to 100 MeV/c.
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