Inclusive particle production in e/sup +/e- interactions at 3. 8 and 4. 8 GeV. Technical report No. 77-040. [Cross sections, Feynman and Bjorken scaling]

Technical Report · Thu Jan 01 04:00:00 EST 1976

DOI:https://doi.org/10.2172/7109882· OSTI ID:7109882

Atwood, T. L.

This dissertation describes an experiment which measured the inclusive momentum spectra for hadrons and muons produced in e/sup +/e/sup -/ interactions at total center of mass energies of 3.8 and 4.8 GeV. The experiment was performed at the SPEAR electron-positron storage ring at the Stanford Linear Accelerator Center. It consisted of a single-arm spectrometer, with additional apparatus to measure charged multiplicities and to tag collinear muon and electron pairs. The Lorentz-invariant cross section for hadrons is found to exhibit Feynman scaling at all measured momenta. The invariant cross sections for pions, kaons and protons fell along the same exponential energy curve, exhibiting a characteristic hadron temperature of kT = 0.19 GeV. Bjorken scaling was found to hold separately for pions and for kaons for x = 2E/..sqrt..s > 0.4; however, the x-dependence of the two cross sections are significantly different. Results are also presented for the inclusive momentum distributions of the hadron charged multiplicity. An examination of inclusive muon production found the presence of a small anomalous muon signal for two-prong events noncoplanar by more than 20/sup 0/ and with p/sub ..mu../ > 1.05 GeV/c; dsigma/domega/sub 90/sup 0// = 17/sup +12//sub -9/ pb/sr. Known processes accounted for the observed muon events having charged multiplicity greater than 2, giving an upper limit at the 95% confidence level of dsigma/domega/sub 90/sup 0// < 7.5 pb/sr for any new process.

• Research Organization: Maryland Univ., College Park (USA). Dept. of Physics and Astronomy
• DOE Contract Number: EY-76-C-05-2504
• OSTI ID: 7109882
• Report Number(s): ORO-2504-252
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Electromagnetic Interactions &amp; Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
FERMIONS
GEV RANGE
GEV RANGE 01-10
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTON-LEPTON INTERACTIONS
LEPTONS
LIMITING VALUES
LINEAR MOMENTUM
LORENTZ INVARIANCE
MULTIPLE PRODUCTION
MUONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
SPECTRA