Production and fragmentation of the excited deuterium-zero charm meson in positronium annihilations at sqrt.s = 29 GeV
Abstract
In this thesis, the neutral vector charm meson D$\sp{*0}$ has been studied. The data, corresponding to an integrated luminosity of 300 pb$\sp{-1}$, were collected using the High Resolution Spectrometer (HRS). The HRS is located at the PEP $e\sp+e\sp-$ storage ring at the Stanford Linear Accelerator Center. The detector subsystems relevant to the analysis are the seventeen layer drift chamber system and the barrel calorimeter system. Both of these devices are located within a solenoidal magnetic field of 1.62 Tesla. The charged particle momentum resolution is $\sigma\sb{\rm p}$/p $\sim$ 6 $\times$ 10$\sp{-3}$p (p in GeV) for the momentum range used in this analysis. The electromagnetic energy resolution of the barrel shower counter system is $\sigma\sb{\rm E}$/E $\sim$ 0.16/$\sqrt{\rm E}$ (E in GeV). The radiative decay of the D$\sp{*0}$ into a scalar charm meson, D$\sp0$, and a photon, $\gamma$, where the D$\sp0$ decays into a kaon and a pion ($K\sp-\pi\sp+$) has been observed. The production cross section in units of the point cross section is 0.63 $\pm$ 0.22 for fractional energy $Z \geq$ 0.5. This result is compared with the result from the JADE collaboration. The fragmentation function is compared with that of the D$\sp{*+}$ meson, also measured with the HRS.
Degree
Ph.D.
Advisors
Shibata, Purdue University.
Subject Area
Particle physics
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