Meson production in photon and neutrino experiments
The reaction {gamma}p {yields} {rho}{sup 0}{sub fast}p{pi}{sup +}{pi}{sup {minus}} has been studied with the linearly polarized 20 GeV monochromatic photon beam at the SLAC Hybrid Facility, to test the prediction of s channel helicity conservation in inelastic diffraction for t{prime} < 0.4 (GeV/c){sup 2}. In a sample of 1934 events from this reaction, the {rho}{sup 0} decay angular distributions and spin density matrix elements are consistent with s channel helicity conservation. The {pi}{sup +}{pi}{sup {minus}} mass shape displays the same skewing as seen in the reaction {gamma}p {yields} p{pi}{sup +}{pi}{sup {minus}}, and the p{pi}{sup +}{pi}{sup {minus}} mass distribution compares well and scale according to the vector dominance model with that produced in {pi}{sup {plus minus}}p {yields} p{pi}{sup +}{pi}{sup {minus}}. Coherent production of the a{sub 1} meson has been observed through the reaction {nu}Fr {yields} {mu}{sup {minus}}a{sub 1}{sup +}Fr in the Tohoku 1m freon bubble chamber hybrid system. The bubble chamber was exposed to the Fermilab wideband neutrino beam, generated by 800 GeV protons at the Tevatron. The observed rate from the final charged current sample of 1792 events was 1.1 {plus minus} 0.47%, and the a{sub 1} - W coupling is calculated to be f{sup 2}{sub a}/f{sup 2}{sub {rho}} = 5.2 {plus minus} 2.2. A comparison of the cross section and the kinematical parameters with the theoretical predictions of the vector dominance model, gives reasonable agreement with the data. A Monte-Carlo study was performed to check the possibility of detecting the radiative decay of the D*{sub s} in our bubble chamber. Using the most favorable predicted rate through the {phi} branching ratio, it was determined that three times our data sample would be needed for a one {sigma} effect above background.
- Research Organization:
- Tennessee Univ., Knoxville, TN (USA)
- OSTI ID:
- 7243744
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Photoproduction of. rho. prime mesons in reactions. gamma. p yields p2. pi. sup + 2. pi. sup minus and. gamma. p yields p. pi. sup +. pi. sup minus 2. pi. sup 0 at 20 GeV
Reactions. gamma. p. -->. pi. /sup +/. pi. /sup -/. pi. /sup +/. pi. /sup -/p and. gamma. p. -->. K/sup +/-/. pi. /sup -/+/K/sup 0/p at 20 GeV
Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
MESONS
PRODUCTION
EXPERIMENTAL DATA
GEV RANGE 10-100
MEASURING INSTRUMENTS
MEASURING METHODS
MONTE CARLO METHOD
PHOTON-NEUTRINO INTERACTIONS
BOSONS
DATA
ELEMENTARY PARTICLES
ENERGY RANGE
GEV RANGE
HADRONS
INFORMATION
INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PHOTON-LEPTON INTERACTIONS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena
645100 - High Energy Physics- Particle Interactions & Properties-Experimental
645103 - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties