First observation and measurement of the decay K± -> π±e+e-γ
- Batley JR
- Culling AJ
- Kalmus G
- Lazzeroni C
- Munday DJ
- Slater MW
- Wotton SA
- Arcidiacono Roberta
- Bocquet G
- Cabibbo Nicola
- Ceccucci A
- Cundy D
- Falaleev V
- Fidecaro M
- Gatignon L
- Gonidec A
- Kubischta W
- Norton Alan Robert
- Maier A
- Patel M
- Peters A
- Balev S
- Frabetti Pierluigi
- Goudzovski E
- Hristov P
- Kekelidze V
- Kozhuharov V
- Litov L
- Madigozhin D
- Marinova E
- Molokanova N
- Polenkevich I
- Potrebenikov Y
- Stoynev S
- Zinchenko A
- Monnier E
- Swallow E
- Winston R
- Rubin P
- Walker A
- Baldini Wander
- Cotta Ramusino Angelo
- Dalpiaz Pietro
- Darniani C
- Fiorini Massimiliano
- Gianoli Alberto
- Martini Marco
- Petrucci Fabrizio
- Savrie' Mauro
- Scarpa Marcella
- Wahl Heinrich
- Bizzeti Andrea
- Calvetti Mario
- Celeghini Enrico
- Lacopini E
- Lenti Massimo
- Ruggiero Giuseppe
- Behler M
- Eppard K
- Handel C
- Kleinknecht K
- Marouelli P
- Masetti L
- Moosbrugger U
- Morales CM
- Renk B
- Wache M
- Wanke R
- Winhart A
- Coward D
- Dabrowski A
- Martin TF
- Shieh M
- Szleper M
- Velasco M
- Wood MD
- Anzivino Giuseppina
- Cenci Patrizia
- Imbergarno E
- Nappi Aniello
- Pepe Monica
- Petrucci Maria Carmela
- Piccini Mauro
- Raggi Mauro
- Valdata Marisa
- Cerri Claudio
- Collazuol Gianmaria
- Costantini Flavio
- DiLella L
- Doble N
- Fantechi Riccardo
- Fiorini Luca
- Giudici Sergio
- Lamanna Gianluca
- Mannelli Italo
- Michetti Andrea
- Pierazzini Giuseppe
- Sozzi Marco
- Bloch Devaux B
- Cheshkov C
- Cheze JB
- De Beer M
- Derre J
- Marel G
- Mazzucato E
- Peyaud B
- Vallage B
- Holder M
- Ziolkowski M
- Bifani Simone
- Biino Cristina
- Cartiglia Nicolo'
- Clernencic A
- Goy Lopez Silvia
- Marchetto Flavio Pietro
- Dibon H
- Jeitler A
- Markytan A
- Mikulec I
- Neuhofer G
- Widhalm L.
- MARTELLI, FILIPPO
- VELTRI, MICHELE
Publication date
January 2008
DOIAbstract
Using the full data set of the NA48/2 experiment, the decay K-+/- -> pi(+/-)e(+)e(-)gamma is observed for the first time, selecting 120 candidates with 0 7.3 +/- 11.7 estimated background events. With K -> pi(+/-)pi(0)(D) as normalisation channel, the branching ratio is determined in a model-independent way to be Br(K-+/- -> pi(+/-)e(+)e(-)gamma, m(ee gamma) > 260 MeV/c(2)) = (1.19 +/- 0.12(stat) +/- 0.04(syst)) x 10(-8). This measured value and the spectrum of the e(+)e(-)gamma invariant mass allow a comparison with predictions of chiral perturbation theory
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