Measurement of elastic φ photoproduction at HERA
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 377:4 (1996) 259-272
Abstract:
The production of φ mesons in the reaction e+p → e+φp (φ → K+K-) at a median Q2 of 10-4 GeV2 has been studied with the ZEUS detector at HERA. The differential φ photoproduction cross section dσ/dt has an exponential shape and has been determined in the kinematic range 0.1 < |t| < 0.5 GeV2 and 60 < W < 80 GeV. An integrated cross section of σγp→φp = 0.96 ± 0.19+0.21-.18 μb has been obtained by extrapolating to t = 0. When compared to lower energy data, the results show a weak energy dependence of both σγp→φp and the slope of the t distribution. The φ decay angular distributions are consistent with s-channel helicity conservation. From lower energies to HERA energies, the features of φ photoproduction are compatible with those of a soft diffractive process.Measurements of the B- and B-bar0 meson lifetimes using semileptonic decays.
Physical review letters 76:24 (1996) 4462-4467
Search for chargino-neutralino production in pp-bar collisons at sqrt s=1.8 TeV.
Physical review letters 76:23 (1996) 4307-4311
Search for flavor-changing neutral current B meson decays in pp-bar collisions at sqrt s=1.8 TeV.
Physical review letters 76:25 (1996) 4675-4680
Further Properties of High-Mass Multijet Events at the Fermilab Proton-Antiproton Collider
ArXiv hep-ex/9605004 (1996)