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Miettinen, Hannu E. Zhu, Qiuan 2009-06-04T00:27:15Z 2009-06-04T00:27:15Z 1993 Zhu, Qiuan. "A study of photon-nucleus collisions at high transverse energy." (1993) Diss., Rice University. <a href="https://hdl.handle.net/1911/16699">https://hdl.handle.net/1911/16699</a>. https://hdl.handle.net/1911/16699 Thesis Phys. 1993 Zhu We have measured, for the first time, the atomic number dependence of photon-nucleus collisions at high transverse energy. The measurements were made at FNAL by using a large acceptance calorimeter with 50-400 GeV photons incident on LH$\sb2,$ LD$\sb2,$ Be, C, Al, Cu, Sn and Pb targets. The cross section is parameterized as $\sigma\sb{\gamma A} = \sigma\sb{\gamma p}A\sp\alpha,$ where $\alpha$ is found to increase from 0.9 to 1.1 when the total transverse energy $E\sb{T}$ is increased from roughly 6 GeV to 12 GeV; $\alpha$ is also found to increase with the photon energy at fixed $x\sb{T}\equiv E\sb{T}/\sqrt{s},$ but depends only weakly on the photon energy at fixed $E\sb{T}.$ The increase of $\alpha$ with total transverse energy is qualitatively consistent with previous measurements from the hadron-nucleus collisions, but our $\alpha$ values are somewhat lower. At high transverse energy, photon induced collisions are found to be more jet-like than pion induced collisions, revealing the point-like nature of the photons at high $E\sb{T}.$ The mean planarity in $\gamma A$ collisions is independent of A in the kinematic range covered by this experiment. 83 p. application/pdf eng Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder. Particle physics Elementary particles High energy physics A study of photon-nucleus collisions at high transverse energy Thesis Text Physics Natural Sciences Rice University Doctoral Doctor of Philosophy open.access