Elsevier

Physics Letters B

Volume 599, Issues 3–4, 14 October 2004, Pages 197-211
Physics Letters B

Observation of the rare decay KSπ0μ+μ

https://doi.org/10.1016/j.physletb.2004.08.058Get rights and content
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Abstract

A search for the decay KSπ0μ+μ has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high-intensity KS beam. Six events were found with a background expectation of 0.220.11+0.18 events. Using a vector matrix element and unit form factor, the measured branching ratio is B(KSπ0μ+μ)=[2.91.2+1.5(stat)±0.2(syst)]×109.

Cited by (0)

2

Funded by the UK Particle Physics and Astronomy Research Council.

1

Present address: Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK.

3

Present address: Istituto di Cosmogeofisica del CNR di Torino, I-10133 Torino, Italy.

4

Also at Dipartimento di Fisica dell'Università e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy.

5

On leave from Sezione dell'INFN di Torino, I-10125 Torino, Italy.

6

On leave from Österreichische Akademie der Wissenschaften, Institut für Hochenergiephysik, A-10560 Wien, Austria.

7

On leave from University of Richmond, Richmond, VA 23173, USA; supported in part by the US NSF under award #0140230.

8

Also at Dipartimento di Fisica dell'Università e Sezione dell'INFN di Ferrara, I-44100 Ferrara, Italy.