CP-violation in the decay of K yields. pi. sup +. pi. sup minus. pi. sup 0

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

OSTI ID:5540695

Border, P M

Although CP-violation has been known to occur for 23 years, the only places it has been seen is in the neutral kaon decays to {pi}{sup +}{pi}{sup {minus}} and {pi}{sup 0}{pi}{sup 0}. This thesis is about results from the test run of Fermilab E621, the first high statistics search for CP violation in neutral kaon decays to {pi}{sup +}{pi}{sup {minus}}{pi}{sup 0}. A dual beam setup with an upstream target was used to measure the acceptance. The decays were detected with a magnetic spectrometer made of 6 multi-wire proportional chambers and an array of 86 lead glass blocks. There were two trigger devices to reduce the number of triggers from {Lambda} {yields} p {pi}{sup {minus}}. One used hodoscopes to require symmetry in the charged tracks and the other required two neutral clusters in the glass. The final sample was over 83,000 kaons decaying in this mode. Although no CP violation was observed, new limits were set on its existence. An interference term in the proper time distribution of decays was looked for, which was characterized by an complex number known as {eta}{plus minus}{sub 0}. The final results was Re{prime} ({eta}{plus minus}0) = 0.074 {plus minus} 0.055 and Im{prime} ({eta} {plus minus}0) = {minus}0.238 {plus minus} 0.222 with D (a scale factor) from K{sup +}/K{sup {minus}} cross-sections. Using D = 1, the answer is Re{prime} ({eta}{plus minus}0) = 0.061 {plus minus} 0.029 and Im{prime} ({eta}{plus minus}0) = {minus}0.089 {plus minus} 0.086. Most of the error on the imaginary part comes from being highly correlated with the normalization.

• Research Organization: Michigan Univ., Ann Arbor, MI (USA)
• OSTI ID: 5540695
• 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
BARYONS
BOSONS
CP INVARIANCE
DATA
DECAY
ELEMENTARY PARTICLES
ERRORS
EXPERIMENTAL DATA
FERMIONS
HADRONS
HODOSCOPES
HYPERONS
INFORMATION
INVARIANCE PRINCIPLES
KAONS
KAONS NEUTRAL
LAMBDA BARYONS
LAMBDA PARTICLES
LIMITING VALUES
MAGNETIC SPECTROMETERS
MEASURING INSTRUMENTS
MESONS
MULTIWIRE PROPORTIONAL CHAMBERS
NUMERICAL DATA
PARTICLE DECAY
PIONS
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
PROPORTIONAL COUNTERS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
SPECTROMETERS
STRANGE MESONS
STRANGE PARTICLES
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY