Unusual initial and final state effects in quantum chromodynamics: Annual performance report, July 15, 1988--February 20, 1989

Technical Report · Tue Jan 31 23:00:00 EST 1989

OSTI ID:6207604

Nelson, C A

We have constructed symmetry tests from spin correlations functions in the sequential decay of a spin-0, or spin-1, boson into a fermion-antifermion pair such as /tau//sup +//tau//sup /minus//. A technipion and a Higgs boson can be distinguished by a 10--20% accuracy measurement of the observed leptons' energy-energy correlation function I(E/sub 1/, E/sub 2/, cos /psi//sub 12/) = S + ..gamma../sub CP/ D for the /bar /tau///tau/ decay mode with /tau//sup +-/ ..-->.. /ell//sup +-/..nu../bar /nu//. A much stronger signature occurs for H ..-->.. t/bar t/ with t ..-->.. b..mu../sup +/..nu.., t ..-->.. /bar b/..mu../sup /minus//..nu.., because if the b jet's momenta are also measured, the necessary t and /bar t/ rest frame variables can be determined. The harder lepton's energy spectrum for the decay sequence Z/sup o/ ..-->.. /tau//sup +//tau//sup /minus// ..-->.. ..mu../sup +/e/sup /minus// X is sensitive to the tau coupling parameters xi and ..cap alpha../sub H/ where xi is the Michel polarization parameter for /tau//sup /minus// ..-->.. ..gamma../sup /minus//..nu nu../sup /minus//, and ..cap alpha../sub H/ approx. = 2a/sub /tau// v/sub /tau///(a/sub /tau///sup 2/ + v/sub /tau///sup 2/) where a/sub /tau//, v/sub /tau// describe Z/sup o/ ..-->.. /tau//sup +//tau//sup /minus// at tree level. The parameters xi and ..cap alpha../sub H/ are independently determined. Due to a factorization property, radiative correction to such energy-energy correlations are as tractable as for A/sub LR/. By including two body modes, /tau//sup /minus// ..-->.. A/sup /minus//..nu.. for A = ..pi.., K, /rho/, K*, a/sub 1/, the ideal statistical error for ..cap alpha../sub H/ is reduced to sigma(..cap alpha../sub H/) = 0.005, or a 0.3% error on sin /sup 2/theta/sub w/. The chiral polarization parameters, xi/sub A/, can also, be independently determined from I(E/sub A/, E/sub B/). 6 refs.

• Research Organization: State Univ. of New York, Binghamton (USA). Dept. of Physics
• DOE Contract Number: FG02-86ER40291
• OSTI ID: 6207604
• Report Number(s): DOE/ER/40291-3; ON: DE89008229
• Country of Publication: United States
• Language: English

Related Subjects

645100* -- High Energy Physics-- Particle Interactions & Properties-Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CORRELATION FUNCTIONS
CP INVARIANCE
DECAY
DOCUMENT TYPES
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FUNCTIONS
HEAVY LEPTONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
INVARIANCE PRINCIPLES
LEPTONS
PARTICLE DECAY
POSTULATED PARTICLES
PROGRESS REPORT
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
TAU PARTICLES
Z NEUTRAL BOSONS