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By James A. Crittenden
The 1st 5 years of operation of the 2 multi-purpose experiments ZEUS and H1 on the HERA electron--proton garage ring facility in Hamburg, Germany have opened a brand new period within the learn of diffractive vector-meson construction in high-energy photon--proton interactions. This e-book offers readers who've a basic wisdom of the options and experimental options of simple particle physics with the data essential to determine the prestige of the hot investigations ahead of the tip of 1996. The measurements are put within the wealthy ancient context of past experiences of photograph- and leptoproduction of vector mesons.
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Additional info for Exclusive Production of Neutral Vector Mesons at the Electron-Proton Collider HERA
Example text
1 General E x p e r i m e n t a l Considerations T h e P h o t o n Lifetime. The discussion of the validity of the photon-proton cross section definition follows closely that in Sect. 25) where Mv is the mass of the final-state vector meson. 12), but all of the measurements we discuss in the following cover kinematic ranges in which the lifetime of the photon in the proton rest frame far exceeds the interaction time associated with the longitudinal extent of the proton in its rest frame. - s o o ~ .
Helicity analyses of the vector-meson decay products have been presented, leading to estimations for the ratio of longitudinal to transverse photon cross sections. This variety of measurements now available has prompted a great deal of new theoretical work, which we summarize in the following section. 2. Contemporary Theoretical Approaches A broad array of theoretical considerations has been brought to bear on the problem of exclusive vector-meson production at HERA over the past few years. The high level of interest has been stimulated in part by the wide kinematic range covered by the data, with photon virtualities ranging from 10-l0 to 30 GeV 2 and photon-proton center-of-mass energies from 40 to 200 GeV.
Of uncertain dynamical origin, this effect remains topical today in the investigations of the HERA data. 5) The energy scale factor so is determined empirically to be comparable to the hadronic mass scale of about 1 GeV2. 8) a t o t C( The weak energy dependence of the total scattering cross sections measured at low energy motivated the introduction of the Pomeron trajectory with intercept near unity, and these considerations were again brought to the fore when the early HERA results for the total photoproduction cross sections gave results quantitatively comparable to the measurements at low energy.