Selected studies of radiative processes

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5074881

Banerjee, S

This dissertation deals with two radiative processes, namely, radiative tau decays and angular correlation analyses in radiative quarkonium decays. The similarity between the body {tau} decay into the pion and neutrino and the pion decay into the muon and neutrino suggest the possibility of radiative {tau} decays ({tau} {yields} {pi}{nu}{sub {tau}}{gamma} and {tau} {yields} {rho}{nu}{sub {tau}}{gamma}) analogous to the radiative pion decay. These three body decays can provide a means for determining the {tau}-neutrino mass. The decay {tau} {yields} {nu}{sub {tau}}{pi}{gamma} is useful for determining the sign and magnitude of the structure parameter {gamma}. Angular correlation analyses for radiative quarkonium decays into intermediate resonances which subsequently decay into two or more mesons are performed. It is found that these angular distributions enable one to distinguish between the spin and parity of the intermediate resonances. A general formalism for multihadron decays of the intermediate resonances is also presented using the momentum of a single spinless decay product as analyzer. Additional complications which arise when interfering resonances contribute to the decay products are also considered. Electromagnetic decay of quarkonium into a pair of massive leptons is also investigated with a view to obtaining fractions of opposite helicity lepton pairs produced in the decay as helicity is not conserved for massive leptons. Double radiative decays of the quarkonium system have been studied as well.

• Research Organization: Virginia Univ., Charlottesville, VA (USA)
• OSTI ID: 5074881
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645203 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR CORRELATION
ANGULAR MOMENTUM
BOSONS
CORRELATIONS
DECAY
ELECTROMAGNETIC PARTICLE DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HEAVY LEPTONS
HELICITY
LEPTONS
MASS
MASSLESS PARTICLES
MESONS
NEUTRINOS
PARITY
PARTICLE DECAY
PARTICLE PROPERTIES
PARTICLE STRUCTURE
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARKONIUM
RADIATIVE DECAY
RESONANCE PARTICLES
SPIN
TAU NEUTRINOS
TAU PARTICLES