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High Energy Photoproduction of Neutral Mesons


Kreinick, David Louis (1970) High Energy Photoproduction of Neutral Mesons. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/RSES-8J41.


Cross sections for the photoproduction of neutral pi, eta, rho and phi mesons on hydrogen have been measured at the Stanford Linear Accelerator Center using a missing mass spectrometer technique. The data cover photon energies between 5.0 and 17.8 GeV and four momentum transfer squared t between -.12 and -1.38 (GeV/c)2.

Pion differential cross sections at lower energies show a peak at low momentum transfers, a distinctive dip and secondary maximum for t in the region -.4 to -.9 (GeV /c)2, and a smooth decrease at higher momentum transfers. As photon energy increases, the dip becomes less pronounced, in contradiction to the expectations of simple Regge theories based on the exchange of omega and B trajectories only.

Eta photoproduction was measured only below 10 GeV. The cross section has about the same magnitude as the pion production cross section, but decreases exponentially with t, showing no dip.

Rho mesons appear to be diffractively produced. The differential cross section varies approximately as exp(8.5t + 2t2). It falls slowly with energy, decreasing about 35 percent from 6 GeV to 17.8 GeV. A simple quark model relation appears to describe the data well.

Phi meson cross sections are also consistent with diffraction production. The differential cross section varies approximately as exp(4t). The cross section tends to decrease slightly with photon energy.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics and Economics) ; Photoproduction, meson, pion, rho, eta, phi
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Minor Option:Economics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Peck, Charles W.
Thesis Committee:
  • Unknown, Unknown
Defense Date:22 September 1969
Funding AgencyGrant Number
Record Number:CaltechTHESIS:03102014-130814498
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8118
Deposited By: Benjamin Perez
Deposited On:10 Mar 2014 20:46
Last Modified:16 May 2024 21:47

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