A new measurement of the K±→π±γγ decay at the NA48/2 experiment

6533b7d8fe1ef96bd126accd

RESEARCH PRODUCT

A new measurement of the K±→π±γγ decay at the NA48/2 experiment

Fabrizio Petrucci B. Vallage Lau Gatignon Cristina Biino G. Neuhofer A. Winhart M. Sozzi L. Dilella Massimiliano Fiorini Leander Litov S. Giudici T. Fonseca Martin E. Monnier P. Cenci D.c. Cundy Nicola Cabibbo C. Cheshkov V. Kozhuharov R. Fantechi M. Veltri A. I. Zinchenko D.j. Munday Milene Calvetti W. Kubischta M. Savrie Marco Clemencic Nicolo Cartiglia M. Pepe I. Polenkevich B. Bloch-devaux N. Doble M. D. Wood Enrico Celeghini Mauro Piccini A. Ceccucci I. Mannelli A. Gianoli P. Hristov Evelina Gersabeck G.e. Kalmus M. Szleper A. Peters Andrea Bizzeti M. De Beer H. Dibon Wander Baldini Cristina Lazzeroni F. Marchetto A. Cotta Ramusino A. Dabrowski Ivan Mikulec L. Widhalm S. Goy Lopez J.b. Cheze J. Derre M. C. Petrucci Mauro Raggi A. Norton Roland Winston C. Morales Morales M. Behler Roberta Arcidiacono A. A. Maier F. Costantini G. Ruggiero E. Imbergamo Luca Fiorini M. Ziolkowski S. Stoynev L. Masetti Mayda Velasco A. Gonidec P. Rubin C. Cerri M. Wache Vladimir Kekelidze P. Marouelli D. T. Madigozhin U. Moosbrugger G. Collazuol M. Markytan M. Lenti E. Iacopini H. D. Wahl M. Fidecaro G.m. Pierazzini E. Mazzucato B. Peyaud P. F. Dalpiaz M.w. Slater G. Lamanna M. Shieh B. Renk C. Damiani J. R. Batley M. Scarpa G. Bocquet Yu. Potrebenikov Evgueni Goudzovski S. Balev M. Martini Alan W. Walker V. Falaleev A. Nappi Manfred Jeitler G. Anzivino N. A. Molokanova K. Eppard P. L. Frabetti Konrad Kleinknecht A. Michetti M. Valdata-nappi M. Holder S. Venditti S. A. Wotton Maulik R. Patel Simone Bifani Rainer Wanke E. C. Swallow D. Coward G. Marel

subject

Nuclear physics Physics Nuclear and High Energy Physics Particle decay Pion Chiral perturbation theory Meson Branching fraction Hadron Analytical chemistry Radioactive decay Dimensionless quantity

description

Abstract The NA48/2 experiment at CERN collected two data samples with minimum bias trigger conditions in 2003 and 2004. A measurement of the rate and dynamic properties of the rare decay K ± → π ± γ γ from these data sets based on 149 decay candidates with an estimated background of 15.5 ± 0.7 events is reported. The model-independent branching ratio in the kinematic range z = ( m γ γ / m K ) 2 > 0.2 is measured to be B MI ( z > 0.2 ) = ( 0.877 ± 0.089 ) × 10 − 6 , and the branching ratio in the full kinematic range assuming a particular Chiral Perturbation Theory description to be B ( K π γ γ ) = ( 0.910 ± 0.075 ) × 10 − 6 .

year	journal	country	edition	language
2014-03-01	Physics Letters B

https://doi.org/10.1016/j.physletb.2014.01.038