A study of isolated photons in Z0 hadronic decays using the DELPHI detector at LEP

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1992
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Holmes, Randall
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E. I. Rosenberg
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Physics and Astronomy
Physics and astronomy are basic natural sciences which attempt to describe and provide an understanding of both our world and our universe. Physics serves as the underpinning of many different disciplines including the other natural sciences and technological areas.
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We present a study of the production of energetic isolated photons in the reaction e[superscript]+e[superscript]-→ Z[superscript]0→ q[macron]q[gamma] using the DELPHI detector at LEP. Within the context of the Standard Model, our results for final state radiation show no evidence for anomolous photon production due to rare or new processes. We present a comparison of our data with these theoretical expectations and present upper limits at the 95% CL on the cross section times the branching ratio to hadrons and a photon for the rare or new processes: (1) [sigma](e[superscript]+e[superscript]-→ Z[superscript]0→ H[superscript]0[gamma])· BR(H[superscript]0→ q[macron]q), (2) [sigma](e[superscript]+e[superscript]-→ Z[superscript]0→ qq[superscript]*)· BR(q[superscript]*→ q[gamma]), (3) [sigma](e[superscript]+e[superscript]-→ Z[superscript]0→ Z[superscript]*[gamma])· BR(Z[superscript]*→ q[macron]q).

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Wed Jan 01 00:00:00 UTC 1992