Exclusive Production of Neutral Vector Mesons at the by James A. Crittenden

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 booklet presents readers who've a common wisdom of the strategies and experimental suggestions of user-friendly particle physics with the knowledge essential to determine the prestige of the hot investigations ahead of the top of 1996. The measurements are put within the wealthy ancient context of previous reviews of photograph- and leptoproduction of vector mesons.

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Extra info for Exclusive Production of Neutral Vector Mesons at the Electron-Proton Collider HERA

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I ~ . . 50. . 2 ~ . . 2'50.... 300 W [C,eV] HI 1994 . ~ . I . . . I . . I . . I . . I . . s~v ~ ~ ~ . 2 ! 2 , . I 50 . . I 100 . . I 150 . . I 200 . . I 250 . . 300 w [c~v] F i g . 1. The value of F2(x = Q 2 / W ~ . p , Q2) as a function of the ~/*p center-ofmass energy WT. p for various values of Q2 as measured by the ZEUS [29] and H1 [35] collaborations with d a t a recorded in 1994. 1 Total Photon-Proton Cross Sections 39 2 ZEUS 94 ~ - x,,/~,) Qz. 0 9 r a ar ~ VVvv~,v Vyv,vY 121 ~ +* [] 1 0 I~ .

Spectrum from the two-pion contribution to the photon spectral function, which is given by the pion form factor. The coupling of the p0 meson to the nonresonant continuum was understood in terms of an effective field theory approximating QCD for composite hadrons. The calculation yielded good agreement to a measurement of the mass spectrum at low energy where a cusp arising from p~ mixing is evident. Consistency with the ZEUS photoproduction result [85] was also achieved, though the statistical accuracy of this early measurement at high energy is much weaker, preventing a clear observation of such an interference cusp, if it is present.

We now discuss the experimental issues common to the measurements for each type of vector meson investigated. Thereafter follows a discussion of the considerations particular to each of these vector mesons and to each decay mode studied. 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.

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