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An Experimental Study of the 2 Neutral-pion Decay of the Long-lived Neutral K-meson

Author : Paul C. Wheeler

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Page : 151 pages

File Size : 39,86 MB

Release : 1968

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Book Description

The 2 neutral-pion CP-violating decay of the neutral-K2-meson was studied in a recent experiment at the Princeton-Pennsylvania Accelerator. The energy spectrum of generated gamma-rays was obtained for the center-of-mass system of the neutral-K2 and used to measure the branching ratio (neutral-K2 to 2 neutral-pions)/(neutral-K2 to all modes). An upper limit of 0.0031 was obtained by normalizing to the neutral-K2 to 3 neutral-pion decay mode. (Author).











Neutral Kaons

Author : Radoje Belusevic

Publisher : Springer

Page : 200 pages

File Size : 43,66 MB

Release : 2014-01-15

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ISBN : 9783662156155

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Book Description

The neutral K meson or neutral kaon, K0, and its antiparticle, K(bar)0, form a remarkable quantum-mechanical two-state system that has played an important role in the history of elementary particle physics. Indeed, ever since the discovery of K0 half a century ago, neutral kaons have been a rich source of unique and facinating phenomena associated with their production, decay and propagation in both vacuum and matter. This overview conveys the unique beauty of a quantum-mechanical system that contains so many of the aspects of modern physics. WICHTIGE INFO: Satzanweisung!!! bitte setzen Sie bei K0 das Zeichen "0" als hochgestellte Null. K(bar) ersetzen Sie bitte, indem Sie uber das K einen Querstrich setzen und das "(bar)" dann bitte loschen. Danke, jlenz(Tel. 307)



Light-Meson Two-Photon Decays in Full QCD.

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Page : 45202 pages

File Size : 24,91 MB

Release : 2008

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We present a study of two-photon decays of light mesons, focusing on the neutral pion decay. This important process highlights the effects of the axial anomaly in QCD but has been little studied on the lattice. By applying the Lehmann-Symanzik-Zimmermann (LSZ) reduction formula, we reconstruct the electromagnetic matrix elements from three-point vector-vector Green functions calculated on 2+1-flavor isotropic clover lattices.





Observation of the Two-photon Decay of the Neutral-k2 Meson

Author : L. Criegee

Publisher :

Page : 10 pages

File Size : 29,52 MB

Release : 1966

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ISBN :

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An arrangement of spark chambers and scintillation shower detectors was used to investigate the two-photon decay mode of the neutral K2 meson. Twenty-nine candidates were found for this decay mode. However, 12 plus or minus 7 of these events can originate from the neutral-K2 to 3 neutral-pion mode and the CP-violating neutral-K to 2 neutral-pion decay. Monte Carlo simulations indicate that 5 plus or minus of the 12 events are likely to originate from the 3 neutral-pion decays, leaving 7 plus or minus events which may be ascribed to 2 neutral-pion decays. The corresponding branching ratios are: Rate (neutral-K2 to gamma) (neutral-K to all modes) = (1.3 plus or minus 0.6) x 0.0001; Rate 9neutral-K2 to 2 neutral pion)/Rate (Neutral-K2 to all modes) = (1.2 + 1.5 or -1.2) x 0.001.