Study of. nu. d r arrow. mu. sup minus pp sub s and. nu. d r arrow. mu. sup minus. Delta. sup ++ (1232) n sub s using the BNL 7-foot deuterium-filled bubble chamber

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.42.1331· OSTI ID:6424239

Kitagaki, T; Yuta, H; Tanaka, S; Yamaguchi, A; Abe, K; Hasegawa, K; Tamai, K; Sagawa, H; Akatsuka, K; Furuno, K; Tamae, K ^[1]; Higuchi, M; Sato, M ^[2]; Kahn, S A; Murtagh, M J; Palmer, R B; Samios, N P; Tanaka, M ^[3]

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1. Tohoku University, Sendai (Japan)
2. Tohoku Gakuin University, Sendai (Japan)
3. Brookhaven National Laboratory, Upton, NY (USA)

The weak nucleon axial-vector ({ital F}{sub {ital A}}) and vector ({ital F}{sub {ital V}}) form factors are determined from the momentum-transfer-squared ({ital Q}{sup 2}) distributions using 2538 {mu}{sup {minus}} {ital p} and 1384 {mu}{sup {minus}}{Delta}{sup ++} events. The data were obtained from 1 800 000 pictures taken in the BNL 7-foot deuterium-filled bubble chamber exposed to a wide-band neutrino beam with a mean energy {ital E}{sub {nu}}=1.6 GeV. In the framework of the conventional {ital V}{minus}{ital A} theory with standard assumptions, the value obtained from the {mu}{sup {minus}}{ital p} events for the axial-vector mass {ital M}{sub {ital A}} in the pure dipole parameterization is 1.070{sub {minus}0.045}{sup +0.040} GeV and from the {mu}{sup {minus}}{Delta}{sup ++} events is 1.28{sub {minus}0.10}{sup +0.08} GeV. These results are in good agreement with an earlier measurement from this experiment and other recent results. The reaction mechanisms for both processes are compared and found to be very similar. A two-parameter fit for the quasielastic reaction, using dipole forms for {ital F}{sub {ital V}} and {ital F}{sub {ital A}}, yields {ital M}{sub {ital A}}=0.97{sub {minus}0.11}{sup +0.14} GeV and {ital M}{sub {ital V}}=0.89{sub {minus}0.07}{sup +0.04} GeV, which is in good agreement with the conserved-vector-current value of {ital M}{sub {ital V}}=0.84 GeV. Possible deviations from the standard assumptions are also discussed.

• OSTI ID: 6424239
• Journal Information: Physical Review, D (Particles Fields); (USA), Vol. 42:5; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DELTA-1232 BARYONS
PARTICLE PRODUCTION
MUONS MINUS
NEUTRINO-DEUTERON INTERACTIONS
QUASI-ELASTIC SCATTERING
AXIAL-VECTOR CURRENTS
BUBBLE CHAMBERS
FORM FACTORS
GEV RANGE 01-10
MOMENTUM TRANSFER
MONTE CARLO METHOD
MUON NEUTRINOS
NEUTRONS
PROBABILITY
PROTONS
V-A THEORY
VECTOR CURRENTS
ALGEBRAIC CURRENTS
BARYONS
CURRENTS
DELTA BARYONS
DIRECT REACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GAS TRACK DETECTORS
GEV RANGE
HADRONS
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTONS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MUONS
N BARYONS
NEUTRINOS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
QUASI-FREE REACTIONS
RADIATION DETECTORS
SCATTERING
645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties