a Study of the Hadro Production Characteristics of the First Excited States of Charm Mesons.
Abstract
This thesis reports on a study of the production characteristics of the first excited states of the charged charm mesons (D^{*+/}) measured by Fermilab experiment E653 in 800 GeV/c protonemulsion ( A = 25) interactions. It was found that the average value of the transverse momenta squared of the D^ {*+/}s is 0.93_sp {0.09}{+0.10} +/ 0.10 (GeV/c)^2, where the first error is the statistical error and the second one is systematic. The Feynman x_{F} distribution of the D^{*+/}s fitted the function{dNover dx _{F}} ~ (1   x_{F})^{N_ {F}},with N_ {F} = 10.7_sp{1.9 }{+2.0} +/ 2.1. With this parameterization and a MARK III measurement of BR(D^0to K^ + mu^+ + nu_mu) = 0.042 +/ 0.014, the D ^{*+/} total cross section was estimated as 68 +/ 30 (microbarns) per protonnucleon interaction, if a linear atomic number dependence of the total cross section was assumed. However, the observed Feynman x_ {F} distribution of the D^ {*+/}s might not be symmetric around x_{F} = 0. The significance of the asymmetry between the region 0.06 < x_{F} < 0 and 0 < x_{F} < 0.06 was about 1.7 standard deviation in this charm sample. In x_{F} > 0.05 region, which is well represented in this charm sample, and ignore the BR(D^0 to K^ + mu ^+ + nu_{mu}) measurement, the protonnucleon total cross section of D^{*+/} (for x_{F} > 0.05) times the D^0 to K^ + mu^+ + nu_{mu} branching ratio was determined to beBR(D^0 to K^ + mu^+ + nu_ {mu}) times sigma_sp {pN}{D^*+/}(x_ {F} > 0.05) = 2.6 +/ 0.7 (mu b), under the linear Adependence assumption. The D^0s from decay D ^{* +} to D^0 + pi ^+ had a lifetime of 0.448_sp {0.046}{+0.052} +/ 0.068 (picoseconds), which is consistent with the world average value of 0.428 +/ 0.011 (ps).
 Publication:

Ph.D. Thesis
 Pub Date:
 1989
 Bibcode:
 1989PhDT........48Z
 Keywords:

 Physics: Elementary Particles and High Energy; Physics: Nuclear; Statistics