Exclusive <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>ρ</mi></math></span> Production by Virtual Photons

L. A. Ahrens; K. Berkelman; D. G. Cassel; C. T. Day; B. G. Gibbard; D. J. Harding; D. L. Hartill; J. W. Humphrey; T. J. Killian; J. S. Klinger; J. T. Linnemann; E. A. Treadwell; D. H. White

doi:10.1103/PhysRevLett.42.208

Exclusive $ρ$ Production by Virtual Photons

L. A. Ahrens, K. Berkelman, D. G. Cassel, C. T. Day, B. G. Gibbard, D. J. Harding, D. L. Hartill, J. W. Humphrey, T. J. Killian, J. S. Klinger, J. T. Linnemann, E. A. Treadwell, and D. H. White

Phys. Rev. Lett. 42, 208 – Published 22 January 1979

Abstract

The cross section for production of $ρ^{0}$ mesons has been measured in the reaction $e + p \to e + p + π^{+} + π^{-}$ . The cross section is presented as a function of $W$ , the c.m. energy of the virtual-photon-proton system, and - $Q^{2}$ , the square of the virtual-photon mass. The vector-dominance model is not able to describe the dependence of the cross section on the parameters $Q^{2}$ and $W$ . The slope parameter $B$ describing the scattering of the proton exhibits a significant variation with $Q^{2}$ .

Received 28 June 1978

DOI:https://doi.org/10.1103/PhysRevLett.42.208

Authors & Affiliations

L. A. Ahrens^*, K. Berkelman, D. G. Cassel, C. T. Day^†, B. G. Gibbard^*, D. J. Harding^‡, D. L. Hartill, J. W. Humphrey^*, T. J. Killian^§, J. S. Klinger^‡, J. T. Linnemann^∥, E. A. Treadwell^‡, and D. H. White^*

Laboratory of Nuclear Studies, Cornell University, Ithaca, New York 14853

^*Present address: Brookhaven National Laboratory, Upton, N. Y. 11973.
^†Present address: Lawrence Berkeley Laboratory, Berkeley, Calif. 94702.
^‡Present address: Fermi National Accelerator Laboratory, P. O. Box 500, Batavia, Ill. 60510.
^§Present address: EP Division, CERN, 1211 Geneva 23, Switzerland.
^∥Present address: Rockefeller University Group, CERN, 1211 Geneva 23, Switzerland.