First observation of the KS → π0γ γ decay

First observation of the KS → π0γ γ decay

Using the NA48 detector at the CERN SPS, 31 KS → π 0γγ candidates with an estimated background of 13.7 ± 3.2 events have been observed. This first observation leads to a branching ratio of BR(KS → π0γγ) z>0.2 = (4.9 ± 1.6stat ± 0.9 syst) × 10-8 in agreement with Chiral Perturbation Theory pre...

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Bibliographic Details
Main Authors: Lai, A, Marras, D, Batley, JR, Dosanjh, R, Gershon, T, Kalmus, G, Lazzeroni, C, Munday, D, Olaiya, E, Parker, M, White, T, Wotton, SA, Arcidiacono, R, Barr, G, Bocquet, G, Ceccucci, A, Cuhadar-Dönszelmann, T, Cundy, D, Doble, N, Falaleev, V, Gatignon, L, Gonidec, A, Gorini, B, Grafström, P, Kubischta, W
Format: Journal article
Language:English
Published: 2004
Description
Summary:Using the NA48 detector at the CERN SPS, 31 KS → π 0γγ candidates with an estimated background of 13.7 ± 3.2 events have been observed. This first observation leads to a branching ratio of BR(KS → π0γγ) z>0.2 = (4.9 ± 1.6stat ± 0.9 syst) × 10-8 in agreement with Chiral Perturbation Theory predictions. © 2003 Elsevier B.V. All rights reserved.

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