Study of the K±→π±γγ decay by the NA62 experiment

6533b85bfe1ef96bd12bb2f4

RESEARCH PRODUCT

Study of the K±→π±γγ decay by the NA62 experiment

T. Spadaro A. Winhart M. Lenti O. Yushchenko Mauro Piccini A. I. Zinchenko Paolo Massarotti P. L. Frabetti M. Serra V. Kurshetsov S. Kholodenko Konrad Kleinknecht Evgueni Goudzovski A. Gianoli S. Gallorini C. Cerri H. O. Danielsson M. Moulson V K Semenov G. Lamanna D. T. Madigozhin T. Numao N. Doble Viacheslav Duk S. Shkarovskiy B. Renk Rainer Wanke M. Veltri V. Bolotov Fabrizio Petrucci G. D'agostini D. Coward A. Norton Roland Winston A. Fucci Vladimir Kekelidze S. Movchan A. Ceccucci E. Imbergamo M. Pepe F. Ambrosino S. Balev Andrea Bizzeti M. Misheva D. Di Filippo Leander Litov H. D. Wahl Emilio Leonardi B. Peyaud Petra Riedler W. Baldini G. Pierazzini P. F. Dalpiaz A. Peters M. Savrie Simone Bifani A. Cotta Ramusino B. Bloch-devaux B. Hallgren V. Obraztsov G. Dellacasa Giuseppe Ruggiero V. Palladino F. Marchetto Jürgen Engelfried A. Salamon S. Venditti F. Costantini N. A. Molokanova K. Eppard V. Falaleev M. Napolitano I. Mannelli A. Romano G. Collazuol A. A. Maier P. Valente F. Bucci Cristina Lazzeroni A. Antonelli Roberto Piandani M. Hita-hochgesand Roberta Arcidiacono E. Gushchin F. Retiere Antonino Sergi Evelina Gersabeck R. Fantechi Cristina Biino Lau Gatignon V. Kozhuharov Mauro Raggi P. Rubin P. Cenci E. Iacopini M. Sozzi Yu. Potrebenikov L. Dilella Massimiliano Fiorini S. Giudici S. Goy Lopez G. Saracino G. Anzivino

subject

Physics Nuclear and High Energy Physics Particle decay Pion Chiral perturbation theory Nuclear magnetic resonance Meson Branching fraction Hadron Analytical chemistry Elementary particle Dimensionless quantity

description

Abstract A study of the dynamics of the rare decay K ± → π ± γ γ has been performed on a sample of 232 decay candidates, with an estimated background of 17.4 ± 1.1 events, collected by the NA62 experiment at CERN in 2007. The results are combined with those from a measurement conducted by the NA48/2 Collaboration at CERN. The combined model-independent branching ratio in the kinematic range z = ( m γ γ / m K ) 2 > 0.2 is B MI ( z > 0.2 ) = ( 0.965 ± 0.063 ) × 10 − 6 , and the combined branching ratio in the full kinematic range assuming a Chiral Perturbation Theory description is B ( K π γ γ ) = ( 1.003 ± 0.056 ) × 10 − 6 . A detailed comparison of the results with the previous measurements is performed.

year	journal	country	edition	language
2014-05-01	Physics Letters B

https://doi.org/10.1016/j.physletb.2014.03.016