Published February 1974 | Version v1
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Precision measurement of the relative decay rate of the long-lived neutral K meson into two neutral or charged pions

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Description

The theoretical fundamentals of the experiments, the experimental layout of spark wire chambers and lead glass Cherenkov counters, the selection of the reconstructed events, their kinematical analysis, and the measuring principle are described in detail. The results are 1.00 +- 0.06 for ratio between the branching ratios A[K0(L) → π0π0]/A[K0(S) → π0π0] and A[K0(L) → π+π-]/A[K0(S) → π+π-], and 7.60 +- 180 for the respective phase. These amplitudes and phases are expected in cases where a CP-invariant admixture in the long-lived neutral K-meson is the main reason for the CP invariance. (BJ/AK)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (German)

Die theoretischen Grundlagen des Experimentes, der experimentelle Aufbau von Drahtfunkenkammern und Bleiglas-Cherenkovzaehler, die Auswahl der rekonstruierten Ereignisse, ihre kinematische Analyse und das Messprinzip werden im Detail beschrieben. Die Ergebnisse sind 1,00 +- 0,06 fuer den Betrag des Verhaeltnisses zwischen den Verzweigungsverhaeltnissen A[K0(L) → π0π0]/A[K0(S) → π0π0] undA[K0(L) → π+π-]/A[K0(S) → π+π-] und 7,60 +- 180 fuer die zugehoerige Phase. Diese Amplituden und Phasen werden erwartet, wenn eine CP-verletzende Beimischung im langlebigen neutralen K-Meson die Hauptquelle der CP-Verletzung ist. (BJ)

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Additional details

Additional titles

Original title (German)
Praezisionsmessung der relativen Zerfallsrate des langlebigen neutralen K-Mesons in zwei neutrale bzw. geladene Pionen

Publishing Information

Imprint Pagination
155 p.
Report number
PITHA--73(1974)

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
7250471
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
BRANCHING RATIO; CHERENKOV COUNTERS; CP INVARIANCE; KAONS NEUTRAL LONG-LIVED; KAONS NEUTRAL SHORT-LIVED; LEPTONIC DECAY; PHASE SHIFT; PIONS MINUS; PIONS NEUTRAL; PIONS PLUS; WIRE SPARK CHAMBERS
Descriptors DEC
ANTIMATTER; ANTIMESONS; ANTIPARTICLES; BASIC INTERACTIONS; BOSONS; DECAY; ELEMENTARY PARTICLES; FILMLESS SPARK CHAMBERS; GAS TRACK DETECTORS; HADRONS; INTERACTIONS; INVARIANCE PRINCIPLES; KAONS; KAONS NEUTRAL; MATTER; MEASURING INSTRUMENTS; MESONS; PARTICLE DECAY; PIONS; PSEUDOSCALAR ANTIMESONS; PSEUDOSCALAR MESONS; RADIATION DETECTORS; SPARK CHAMBERS; STRANGE PARTICLES; WEAK INTERACTIONS

Optional Information

Notes
75 figs.; 12 tabs.; 74 refs.; with app.