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High energy photoproduction of neutral mesons

Citation

Kreinick, David Louis (1970) High energy photoproduction of neutral mesons. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/RSES-8J41. https://resolver.caltech.edu/CaltechTHESIS:03102014-130814498

Abstract

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:Photoproduction, meson, pion, rho, eta, phi
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Economics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Peck, Charles W.
Thesis Committee:
  • Unknown, Unknown
Defense Date:22 September 1969
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
CaltechUNSPECIFIED
Record Number:CaltechTHESIS:03102014-130814498
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:03102014-130814498
DOI:10.7907/RSES-8J41
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8118
Collection:CaltechTHESIS
Deposited By: Benjamin Perez
Deposited On:10 Mar 2014 20:46
Last Modified:21 Dec 2019 03:52

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