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https://hdl.handle.net/2142/23940
Description
Title
Hadroproduction of D* [right arrow] (K [pi]) [pi]
Author(s)
Kroc, Thomas Knight
Issue Date
1989
Doctoral Committee Chair(s)
Wiss, J.E.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
hadroproducation
n-nucleus collisions
FNAL Proton East
decay
Language
en
Abstract
A study of the decay D*+ ---+ (K- 1r+ ) 1r+ (and charge conjugate) has been performed
based on data taken from n-nucleus collisions by the experiment E400 at the
Proton East area of FNAL. A signal was observed at the 3.3a level that behaves properly
under lifetime cuts. A method for determining the acceptance due to spectrometer
geometry and analysis cuts was developed with the intention of making the acceptance
as independent as possible of biases resulting from the production model chosen for the
Monte Carlo studies that determined the acceptance. The acceptance was parameterized
in two different ways chosen so that inconsistencies would expose any remaining
model dependence. The cross-sections resulting from these two parameterizations were
consistent and the average of the two is !::J..a. Br = 2.36 ± .72 (statistical) ± 1.18 (systematic)
over the range -.02 < xF <.3. A comparison is made between this cross-section
and the cross-section found for the decay D* ---+ (K+ K-) 1r , also measured by E400,
over the more limited range 0.< xF <.14 and the two values are found to be statistically
consistent. The cross-section from D* ---+ (K 1r ) 1r is compared to cross-sections determined
by LEBC, an experiment also using a hadron beam of energy similar to E400,
with considerable disagreement although no explicit explanation is readily available.
Both experiments, as well as many others, measure cross-sections that are considerably
larger than lowest order QCD calculations.
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