Measurements of. nu. N charged current cross sections from E. nu. = 25 GeV to E. nu. = 260 GeV

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1981

OSTI ID:5437285

Lee, J R

The primary objective of this experiment was to measure normalized cross sections for the interaction /sub ..nu../N ..-->.. ..mu..-X at energies up to E/sub ..nu../ = 260 GeV. The Fermilab dichromatic neutrino beam is made by focusing 400 GeV protons onto a BeO target to produce a secondary beam containing pions and kaons. Pions and kaons decay into neutrinos in a 340m evaculated decay pipe. the absolute ..pi.. and K flux was determined by measuring the total flux of secondary particles with an ionization chamber and by measuring relative particle composition with a Cherenkov counter. The decay of pions and kaons into neutrinos was calculated to obtain the normalized ..nu.. flux at the detector. We observed 6500 charged current interactions in an 1100 ton iron ..nu.. enta were measured with an iron ..nu.. target. Hadron energy deposited in the detector was measured with calorimetric techniques. Muon trajectories were measured with spark chambers. Muon momenta were measured with an iron toroidal magnet. The total charged current section was measured to be sigma/E/sub ..nu../ = (.700 +- .038) x 10/sup -38/ cm/sup 2//GeV independent of energy from E/sub ..nu../ = 25 GeV to E/sub ..nu../ = 260 GeV. This sets a lower bound on the mass of the W boson of M/sub W/ > 27 GeV at the 90% confidence level. The mean inelasticity is = .484 +- .012 independent of energy. The antiquark fraction of the nucleon is ..cap alpha.. = .21 +- .07 at a mean neutrino energy of E/sub ..nu../ = 226 GeV. The x distributions were measured in the region .1 < .4 at E/sub ..nu../ = 67 GeV and at E/sub ..nu../ = 226 GeV. Scaling violations were found at low x, but they can be removed by using the scaling variable x' = x/(1 + M/sub N//sup 2//Q/sup 2/). These results are in good agreement with a simple quark-parton model of deep inelastic scattering.

• Research Organization: California Inst. of Tech., Pasadena (USA)
• OSTI ID: 5437285
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARGED-CURRENT INTERACTIONS
NEUTRINO-NUCLEON INTERACTIONS
BOSONS
EXPERIMENTAL DATA
GEV RANGE 10-100
GEV RANGE 100-1000
HADRONS
IRON
MUONS
NEUTRINO REACTIONS
PARTON MODEL
QUARK MODEL
TOTAL CROSS SECTIONS
COMPOSITE MODELS
CROSS SECTIONS
DATA
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
GEV RANGE
INFORMATION
INTERACTIONS
LEPTON REACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
METALS
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE MODELS
TRANSITION ELEMENTS
645102* - High Energy Physics- Particle Interactions &amp; Properties-Experimental- Weak Interactions &amp; Properties