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) × 106. The extrapolation to the full kinematic space, using a specific model, is found to be (3.45 ± 0.16) × 106, in agreement with chiral perturbation theory predictions.

Details

Title
First observation and study of the K±→ π0π0μ±ν decay
Author
Batley, J. R. 1 ; Kalmus, G. 1 ; Lazzeroni, C. 2 ; Munday, D. J. 2 ; Slater, M. W. 2 ; Wotton, S. A. 1 ; Arcidiacono, R. 3 ; Bocquet, G. 4 ; Cabibbo, N. 4 ; Ceccucci, A. 4 ; Cundy, D. 5 ; Falaleev, V. 6 ; Fidecaro, M. 4 ; Gatignon, L. 7 ; Gonidec, A. 4 ; Kubischta, W. 4 ; Maier, A. 4 ; Norton, A. 8 ; Patel, M. 9 ; Peters, A. 4 ; Monnier, E. 10 ; Swallow, E. 11 ; Winston, R. 12 ; Rubin, P. 13 ; Walker, A. 14 ; Dalpiaz, P. 15 ; Damiani, C. 15 ; Fiorini, M. 15 ; Martini, M. 15 ; Petrucci, F. 15 ; Savrié, M. 15 ; Scarpa, M. 15 ; Wahl, H. 16 ; Baldini, W. 17 ; Cotta Ramusino, A. 17 ; Gianoli, A. 17 ; Calvetti, M. 18 ; Celeghini, E. 18 ; Iacopini, E. 18 ; Lenti, M. 18 ; Ruggiero, G. 18 ; Bizzeti, A. 19 ; Veltri, M. 20 ; Behler, M. 21 ; Eppard, K. 21 ; Hita-Hochgesand, M. 21 ; Kleinknecht, K. 21 ; Marouelli, P. 21 ; Masetti, L. 21 ; Moosbrugger, U. 21 ; Morales Morales, C. 21 ; Renk, B. 21 ; Wache, M. 21 ; Wanke, R. 21 ; Winhart, A. 21 ; Coward, D. 22 ; Dabrowski, A. 23 ; Fonseca Martin, T. 24 ; Shieh, M. 24 ; Szleper, M. 25 ; Velasco, M. 24 ; Wood, M. D. 22 ; Anzivino, G. 26 ; Imbergamo, E. 26 ; Nappi, A. 26 ; Piccini, M. 26 ; Raggi, M. 27 ; Valdata-Nappi, M. 26 ; Cenci, P. 28 ; Pepe, M. 28 ; Petrucci, M. C. 28 ; Costantini, F. 29 ; Doble, N. 30 ; Fiorini, L. 31 ; Giudici, S. 32 ; Pierazzini, G. 32 ; Sozzi, M. 32 ; Venditti, S. 32 ; Collazuol, G. 33 ; Di Lella, L. 34 ; Lamanna, G. 35 ; Mannelli, I. 36 ; Michetti, A. 36 ; Cerri, C. 37 ; Fantechi, R. 37 ; Bloch-Devaux, B. 38 ; Cheshkov, C. 39 ; Chèze, J. B. 40 ; De Beer, M. 40 ; Derré, J. 40 ; Marel, G. 40 ; Mazzucato, E. 40 ; Peyaud, B. 40 ; Vallage, B. 40 ; Holder, M. 41 ; Ziolkowski, M. 41 ; Bifani, S. 42 ; Clemencic, M. 43 ; Goy Lopez, S. 44 ; Biino, C. 45 ; Cartiglia, N. 45 ; Marchetto, F. 45 ; Dibon, H. 46 ; Jeitler, M. 46 ; Markytan, M. 46 ; Mikulec, I. 46 ; Neuhofer, G. 46 ; Widhalm, L. 46 ; Balev, S.; Frabetti, P. L.; Gersabeck, E. 47 ; Goudzovski, E. 48 ; Hristov, P. 4 ; Kekelidze, V.; Korotkova, A.; Kozhuharov, V. 49 ; Litov, L. 49 ; Madigozhin, D.; Molokanova, N.; Polenkevich, I.; Potrebenikov, Yu.; Stoynev, S. 50 ; Zinchenko, A.

 University of Cambridge, Cavendish Laboratory, Cambridge, United Kingdom (GRID:grid.5335.0) (ISNI:0000 0001 2188 5934) 
 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) 
 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) 
 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X) 
 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) 
 CERN, Genève 23, Switzerland (GRID:grid.9132.9) (ISNI:0000 0001 2156 142X); Sezione dell’INFN di Perugia, Perugia, Italy (GRID:grid.470215.5) 
 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) 
 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) 
 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) 
Pages
137
Publication year
2024
Publication date
Mar 2024
Publisher
Springer Nature B.V.
e-ISSN
10298479
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2986779907
Copyright
© The Author(s) 2024. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.