Inclusive spectra in the upsilon energy region and a study of quark-jet versus gluon-jet fragmentation

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7015286

Brown, D N

A study of particle yields from [Upsilon] and [Chi][prime][sub b] states has been performed using the CLEO II detector operating at the Cornell Electron Storage Ring (CESR). The [Chi][prime][sub b] states are tagged by their associated photon lines from decay of the [Gamma](3S). Produced particle species are identified using specific ionization, time-of-flight measurements, and vertex reconstruction. The momentum spectra of [pi][sup [+-]], [Kappa][sup [+-]], p, [bar p], [Kappa][sup 0][sub s], [pi][sup 0], [Lambda][sup 0], [phi][sup 0], D[sup 0], [rho][sup 0], [Kappa][sup *0], and e[sup [+-]] produced from [Chi][prime][sub b] decay are measured, and comparisons are made to spectra obtained at the [Upsilon](1S), [Upsilon](3S), [Upsilon](4S), and nearby continuum center-of-mass energy regions. The decays pf [Chi][prime][sub b] with J=1 are found to exhibit properties most similar to those observed in continuum q[bar q] decays, while the properties of the [Chi][prime][sub b] with J=0 and 2 are most like the ggg decays of the [Upsilon](1S) state. Fragmentation functions are measured and quantitative and qualitative comparisons are made between the hadronization of quarks and that of gluons. A suggestion is given for a purely empirical treatment of the fragmentation of quark-jets versus gluon-jets.

• Research Organization: Purdue Univ., Lafayette, IN (United States)
• OSTI ID: 7015286
• Country of Publication: United States
• Language: English

Related Subjects

662440* -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BOTTOMONIUM
CESR STORAGE RING
ELEMENTARY PARTICLES
FERMIONS
GLUONS
HADRONS
HYPOTHESIS
INCLUSIVE INTERACTIONS
INTERACTIONS
LIMITING FRAGMENTATION
MESONS
PARTICLE INTERACTIONS
POSTULATED PARTICLES
QUARKONIUM
QUARKS
STORAGE RINGS