Study of the K ±→π ±γγ decay by the NA62 experiment
- C. Lazzeroni
- A. Romano
- A. Ceccucci
- H. Danielsson
- V. Falaleev
- L. Gatignon
- S. Goy
- B. Hallgren
- A. Maier
- A. Peters
- M. Piccini
- P. Riedler
- P. Frabetti
- E. Gersabeck
- V. Kekelidze
- D. Madigozhin
- M. Misheva
- N. Molokanova
- S. Movchan
- Y. Potrebenikov
- S. Shkarovskiy
- A. Zinchenko
- P. Rubin
- W. Baldini
- A. C. Ramusino
- P. Dalpiaz
- M. Fiorini
- A. Gianoli
- A. Norton
- F. Petrucci
- M. Savrié
- H. Wahl
- A. Bizzeti
- F. Bucci
- E. Iacopini
- M. Lenti
- M. Veltri
- A. Antonelli
- M. Moulson
- M. Raggi
- T. Spadaro
- K. Eppard
- M. Hita Hochgesand
- K. Kleinknecht
- B. Renk
- R. Wanke
- A. Winhart
- R. Winston
- V. Bolotov
- V. Duk
- E. Gushchin
- F. Ambrosino
- D. D. Filippo
- P. Massarotti
- M. Napolitano
- V. Palladino
- G. Saracino
- G. Anzivino
- E. Imbergamo
- R. Piandani
- A. Sergi
- P. Cenci
- M. Pepe
- F. Costantini
- N. Doble
- S. Giudici
- G. Pierazzini
- M. Sozzi
- S. Venditti
- S. Balev
- L. DiLella
- S. Gallorini
- E. Goudzovski
- G. Lamanna
- I. Mannelli
- G. Ruggiero
- C. Cerri
- R. Fantechi
- S. Kholodenko
- V. Kurshetsov
- V. Obraztsov
- V. Semenov
- O. Yushchenko
- G. D'Agostini
- E. Leonardi
- M. Serra
- P. Valente
- A. Fucci
- A. Salamon
- B. Bloch Devaux
- B. Peyaud
- J. Engelfried
- D. Coward
- V. Kozhuharov
- L. Litov
- R. Arcidiacono
- S. a. Bifani
- C. Biino
- G. Dellacasa
- F. Marchetto
- T. Numao
- F. Retière
- COLLAZUOL, GIANMARIA
Publication date
January 2014
DOIAbstract
A study of the dynamics of the rare decay K ±→π ±γγ 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=(mγγ/mK)2>0.2 is BMI(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(Kπγγ)=(1.003±0.056)×10-6. A detailed comparison of the results with the previous measurements is performed. © 2014 The Authors
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