Precise measurement of the K±->π±e+e− decay
- 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
- Damiani Chiara
- Fiorini Massimiliano
- Gianoli Alberto
- Martini Marco
- Petrucci Fabrizio
- Savrie' Mauro
- Scarpa Marcella
- Wahl Heinrich
- Bizzetti A
- Calvetti Mario
- Celeghini Enrico
- Iacopini Enrico
- Lenti Massimo
- Ruggiero Giuseppe
- Behler M
- Eppard K
- 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
- Imbergamo Ermanno
- Nappi Aniello
- Pepe Monica
- Petrucci Maria Carmela
- Piccini Mauro
- Raggi Mauro
- Valdata Marisa
- Cerri Claudio
- Fantechi Riccardo
- Collazuol Gianmaria
- DiLella L
- Lamanna Gianluca
- Mannelli Italo
- Michetti Andrea
- Costantini Flavio
- Doble N
- Fiorini Luca
- Giudici Sergio
- Pierazzini Giuseppe
- Sozzi Marco
- Venditti Stefano
- 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'
- Clemencic Marco
- Goy Lopez Silvia
- Marchetto Flavio Pietro
- Dibon H
- Jeitler M
- Markytan M
- Mikulec I
- Neuhofer G
- Widhalm L.
- MARTELLI, FILIPPO
- VELTRI, MICHELE
DOIAbstract
A sample of 7253 K(+/-) -> pi(+/-)e(+)e(-)(gamma) decay candidates with 1.0% background contamination has been collected by the NA48/2 experiment at the CERN SPS, which allowed a precise measurement of the decay properties. The branching ratio in the full kinematic range was measured to be BR = (3.11 +/- 0.12) x 10(-7), where the uncertainty includes also the model dependence. The shape of the form factor W(z), where z = (M(ee)/M(K))(2) was parameterized according to several models, and, in particular, the slope delta of the linear form factor W(z) = W(0)(1 + delta z) was determined to be delta = 2.32 +/- 0.18. A possible CP violating asymmetry of K(+) and K(-) decay widths was investigated, and a conservative upper limit of 2.1 X 10(-2) at...
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