Experimental test of CPT conservation in decays of neutral kaons

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5540707

Grazer, G L

The phase difference {triangle}{phi} between the complex parameters {eta}{sub 00} and {eta} {sub +{minus}}, which describe CP violation in the decays of neutral kaons to neutral and charged pion final states have been measured. These phases are observable in the interference effects which come about from a superposition of short- and long-lived kaons. A non-zero value of {triangle}{phi}, suggested by a 1979 measurement made by a group at New York University, would imply CPT violation. In a recent experiment at Fermilab, K{sub L}-K{sub S} interference was created by sending a pure K{sub L} beam through a regenerator, producing a beam which contained a superposition of both K{sub s} and K{sub L}. Over 14,000 decays of these kaons to {kappa}{sup 0}{kappa}{sup 0} and about 110,000 to {kappa}{sup +}{kappa}{sup {minus}} were collected. The shapes of the proper time spectra for these decays depend on the phases of {eta}{sub 00} for decays to neutral pions and {eta}{sub +{minus}} for decays to charged pions. By comparing these spectra with corresponding distributions obtained from a Monte Carlo simulation, it was found that the phase difference {phi}{sub 00} - {phi}{sub +{minus}} = {minus}0.2{degree} {plus minus} 9.8{degree} (statistics) {plus minus}6{degree} (systematic). No evidence for CPT violation is seen although within the uncertainty the result is compatible with the previous measurement which obtained a larger value.

• Research Organization: Princeton Univ., NJ (USA)
• OSTI ID: 5540707
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COMPARATIVE EVALUATIONS
CP INVARIANCE
CPT THEOREM
DECAY
ELEMENTARY PARTICLES
HADRONS
INVARIANCE PRINCIPLES
KAONS
KAONS NEUTRAL
KAONS NEUTRAL LONG-LIVED
KAONS NEUTRAL SHORT-LIVED
MESONS
MONTE CARLO METHOD
PARTICLE DECAY
PIONS
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES
TESTING
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY