A sample of 3120 K(+/-) -> pi(+/-)mu(+)mu(-) decay candidates with (3.3 +/- 0.7)% background contamination has been collected by the NA48/2 experiment at the CERN SPS, allowing a detailed study of the decay properties. The branching ratio was measured to be BR = (9.62 +/- 0.25) x 10(-8). The form factor W(z), where z = (M(mu mu)/M(K))(2), was parameterized according to several models. In particular, the slope of the linear form factor W(z) = W(0)(1 + delta z) was measured to be delta = 3.11 +/- 0.57. Upper limits of 2.9 x 10(-2) and 2.3 x 10(-2) on possible charge asymmetry and forward-backward asymmetry were established at 90% CL. An upper limit BR(K(+/-) -> pi(-/+)mu(+/-)mu(+/-)) < 1.1 x 10(-9) was established at 90% CL for the rate of the lepton number violating decay. (C) 2011 Elsevier B.V. All rights reserved.
Autori interni: | |
Autori: | Batley JR; Kalmus G; Lazzeroni C; Munday DJ; Slater MW; Wotton SA; Arcidiacono R; Bocquet G; Cabibbo N; Ceccucci A; Cundy D; Falaleev V; Fidecaro M; Gatignon L; Gonidec A; Kubischta W; Norton A; Maier A; Patel M; Peters A; Balev S; Frabetti PL; 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 W; Ramusino AC; Dalpiaz P; Damiani C; Fiorini M; Gianoli A; Martini M; Petrucci F; Savrie M; Scarpa M; Wahl H; Bizzeti A; Lenti M; Veltri M; Calvetti M; Celeghini E; Iacopini E; Ruggiero G; 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; Cenci P; Pepe M; Petrucci MC; Anzivino G; Imbergamo E; Nappi A; Piccini M; Raggi M; Valdata-Nappi M; Cerri C; Fantechi R; Collazuol G; DiLelia L; Lamanna G; Mannelli I; Michetti A; Costantini F; Doble N; Fiorini L; Giudici S; Pierazzini G; Sozzi M; Venditti S; Bloch-Devaux B; Cheshkov C; Cheze JB; De Beer M; Derre J; Marel G; Mazzucato E; Peyaud B; Vallage B; Holder M; Ziolkowski M; Biino C; Cartiglia N; Marchetto F; Bifani S; Clemencic M; Lopez SG; Dibon H; Jeitler M; Markytan M; Mikulec I; Neuhofer G; Widhalm L |
Titolo: | New measurement of the K(+/-) -> pi(+/-)mu(+)mu(-) decay |
Anno del prodotto: | 2011 |
Digital Object Identifier (DOI): | 10.1016/j.physletb.2011.01.042 |
Appare nelle tipologie: | 1.1 Articolo in rivista |