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Abstract
The NA48/2 experiment at CERN reports the first observation of the K± → π0π0μ±ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in the kinematic region of the squared dilepton mass above 0.03 GeV2/c4 is measured to be (0.65 ± 0.03) × 10−6. The extrapolation to the full kinematic space, using a specific model, is found to be (3.45 ± 0.16) × 10−6, in agreement with chiral perturbation theory predictions.
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1 University of Cambridge, Cavendish Laboratory, Cambridge, United Kingdom (GRID:grid.5335.0) (ISNI:0000 0001 2188 5934)
2 University of Cambridge, Cavendish Laboratory, Cambridge, United Kingdom (GRID:grid.5335.0) (ISNI:0000 0001 2188 5934); University of Birmingham, School of Physics and Astronomy, Birmingham, UK (GRID:grid.6572.6) (ISNI:0000 0004 1936 7486)
3 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X); Università degli Studi del Piemonte Orientale, Vercelli, Italy (GRID:grid.16563.37) (ISNI:0000000121663741)
4 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X)
5 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X); Istituto di Cosmogeofisica del CNR di Torino, Torino, Italy (GRID:grid.9132.9)
6 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X); Sezione dell’INFN di Perugia, Perugia, Italy (GRID:grid.470215.5)
7 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X); University of Lancaster, Physics Department, Lancaster, U.K. (GRID:grid.9835.7) (ISNI:0000 0000 8190 6402)
8 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X); University of Glasgow, School of Physics and Astronomy, Glasgow, U.K. (GRID:grid.8756.c) (ISNI:0000 0001 2193 314X)
9 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X); Imperial College London, Physics Department, London, U.K. (GRID:grid.7445.2) (ISNI:0000 0001 2113 8111)
10 The University of Chicago, The Enrico Fermi Institute, Chicago, U.S.A. (GRID:grid.170205.1) (ISNI:0000 0004 1936 7822); Centre de Physique des Particules de Marseille, Université Aix Marseille, CNRS/IN2P3, Marseille, France (GRID:grid.470046.1) (ISNI:0000 0004 0452 0652)
11 The University of Chicago, The Enrico Fermi Institute, Chicago, U.S.A. (GRID:grid.170205.1) (ISNI:0000 0004 1936 7822)
12 The University of Chicago, The Enrico Fermi Institute, Chicago, U.S.A. (GRID:grid.170205.1) (ISNI:0000 0004 1936 7822); University of California, Merced, U.S.A. (GRID:grid.468726.9) (ISNI:0000 0004 0486 2046)
13 University of Edinburgh, Department of Physics and Astronomy, Edinburgh, United Kingdom (GRID:grid.4305.2) (ISNI:0000 0004 1936 7988); George Mason University, Fairfax, U.S.A. (GRID:grid.22448.38) (ISNI:0000 0004 1936 8032)
14 University of Edinburgh, Department of Physics and Astronomy, Edinburgh, United Kingdom (GRID:grid.4305.2) (ISNI:0000 0004 1936 7988)
15 Dipartimento di Fisica e Scienze della Terra dell’Università e Sezione dell’INFN di Ferrara, Ferrara, Italy (GRID:grid.4305.2)
16 Dipartimento di Fisica e Scienze della Terra dell’Università e Sezione dell’INFN di Ferrara, Ferrara, Italy (GRID:grid.4305.2); Universität Mainz, Institut für Physik, Mainz, Germany (GRID:grid.5802.f) (ISNI:0000 0001 1941 7111)
17 Sezione dell’INFN di Ferrara, Ferrara, Italy (GRID:grid.470200.1) (ISNI:0000 0004 1765 4414)
18 Dipartimento di Fisica, Università di Firenze e Sezione dell’INFN di Firenze, Sesto Fiorentino, Italy (GRID:grid.8404.8) (ISNI:0000 0004 1757 2304)
19 Sezione dell’INFN di Firenze, Sesto Fiorentino, Italy (GRID:grid.470204.5) (ISNI:0000 0001 2231 4148); Università di Modena e Reggio Emilia, Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Modena, Italy (GRID:grid.7548.e) (ISNI:0000000121697570)
20 Sezione dell’INFN di Firenze, Sesto Fiorentino, Italy (GRID:grid.470204.5) (ISNI:0000 0001 2231 4148); Università di Urbino, Istituto di Fisica, Urbino, Italy (GRID:grid.12711.34) (ISNI:0000 0001 2369 7670)
21 Universität Mainz, Institut für Physik, Mainz, Germany (GRID:grid.5802.f) (ISNI:0000 0001 1941 7111)
22 Northwestern University, Department of Physics and Astronomy, Evanston, U.S.A. (GRID:grid.16753.36) (ISNI:0000 0001 2299 3507); Stanford University, SLAC National Accelerator Laboratory, Menlo Park, U.S.A. (GRID:grid.168010.e) (ISNI:0000000419368956)
23 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X); Northwestern University, Department of Physics and Astronomy, Evanston, U.S.A. (GRID:grid.16753.36) (ISNI:0000 0001 2299 3507)
24 Northwestern University, Department of Physics and Astronomy, Evanston, U.S.A. (GRID:grid.16753.36) (ISNI:0000 0001 2299 3507)
25 Northwestern University, Department of Physics and Astronomy, Evanston, U.S.A. (GRID:grid.16753.36) (ISNI:0000 0001 2299 3507); National Center for Nuclear Research, Swierk, Poland (GRID:grid.450295.f) (ISNI:0000 0001 0941 0848)
26 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Perugia, Perugia, Italy (GRID:grid.470215.5)
27 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Perugia, Perugia, Italy (GRID:grid.470215.5); Università di Roma La Sapienza, Roma, Italy (GRID:grid.7841.a)
28 Sezione dell’INFN di Perugia, Perugia, Italy (GRID:grid.470215.5)
29 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Pisa, Pisa, Italy (GRID:grid.470215.5)
30 Universität Mainz, Institut für Physik, Mainz, Germany (GRID:grid.5802.f) (ISNI:0000 0001 1941 7111); Dipartimento di Fisica dell’Università e Sezione dell’INFN di Pisa, Pisa, Italy (GRID:grid.5802.f)
31 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Pisa, Pisa, Italy (GRID:grid.5802.f); Universitat de València, Instituto de Física Corpuscular IFIC, València, Spain (GRID:grid.5338.d) (ISNI:0000 0001 2173 938X)
32 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Pisa, Pisa, Italy (GRID:grid.5338.d)
33 Scuola Normale Superiore e Sezione dell’INFN di Pisa, Pisa, Italy (GRID:grid.6093.c) (ISNI:0000 0001 2207 3110); Dipartimento di Fisica dell’Università e Sezione dell’INFN di Padova, Padova, Italy (GRID:grid.6093.c)
34 Universität Mainz, Institut für Physik, Mainz, Germany (GRID:grid.5802.f) (ISNI:0000 0001 1941 7111); Scuola Normale Superiore e Sezione dell’INFN di Pisa, Pisa, Italy (GRID:grid.6093.c) (ISNI:0000 0001 2207 3110)
35 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Pisa, Pisa, Italy (GRID:grid.6093.c); Scuola Normale Superiore e Sezione dell’INFN di Pisa, Pisa, Italy (GRID:grid.6093.c) (ISNI:0000 0001 2207 3110)
36 Scuola Normale Superiore e Sezione dell’INFN di Pisa, Pisa, Italy (GRID:grid.6093.c) (ISNI:0000 0001 2207 3110)
37 Sezione dell’INFN di Pisa, Pisa, Italy (GRID:grid.6093.c)
38 DSM/IRFU — CEA Saclay, Gif-sur-Yvette, France (GRID:grid.457334.2); Dipartimento di Fisica dell’Università, Torino, Italy (GRID:grid.7605.4) (ISNI:0000 0001 2336 6580)
39 DSM/IRFU — CEA Saclay, Gif-sur-Yvette, France (GRID:grid.457334.2); Institut de Physique Nucléaire de Lyon, IN2P3-CNRS, Université Lyon I, Villeurbanne, France (GRID:grid.462474.7) (ISNI:0000 0001 2153 961X)
40 DSM/IRFU — CEA Saclay, Gif-sur-Yvette, France (GRID:grid.457334.2)
41 Universität Siegen, Fachbereich Physik, Siegen, Germany (GRID:grid.5836.8) (ISNI:0000 0001 2242 8751)
42 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Torino, Torino, Italy (GRID:grid.7605.4) (ISNI:0000 0001 2336 6580)
43 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X); Dipartimento di Fisica dell’Università e Sezione dell’INFN di Torino, Torino, Italy (GRID:grid.7605.4) (ISNI:0000 0001 2336 6580)
44 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Torino, Torino, Italy (GRID:grid.7605.4) (ISNI:0000 0001 2336 6580); Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Madrid, Spain (GRID:grid.420019.e) (ISNI:0000 0001 1959 5823)
45 Sezione dell’INFN di Torino, Torino, Italy (GRID:grid.470222.1) (ISNI:0000 0004 7471 9712)
46 Österreichische Akademie der Wissenschaften, Institut für Hochenergiephysik, Wien, Austria (GRID:grid.450258.e) (ISNI:0000 0004 0625 7405)
47 The University of Manchester, School of Physics and Astronomy, Manchester, U.K. (GRID:grid.5379.8) (ISNI:0000 0001 2166 2407)
48 University of Birmingham, School of Physics and Astronomy, Birmingham, UK (GRID:grid.6572.6) (ISNI:0000 0004 1936 7486)
49 University of Sofia, Faculty of Physics, Sofia, Bulgaria (GRID:grid.11355.33) (ISNI:0000 0001 2192 3275)
50 Fermi National Accelerator Laboratory, Batavia, U.S.A. (GRID:grid.417851.e) (ISNI:0000 0001 0675 0679)