Content area
Abstract
We report the results from a study of the full sample of ∼6.031×107K±→π±π0π0 decays recorded by the NA48/2 experiment at the CERN SPS. As first observed in this experiment, the π0π0 invariant mass (M00) distribution shows a cusp-like anomaly in the region around M00=2m+, where m+ is the charged pion mass. This anomaly has been interpreted as an effect due mainly to the final state charge exchange scattering process π+π−→π0π0 in K±→π±π+π− decay. Fits to the M00 distribution using two different theoretical formulations provide the presently most precise determination of a0−a2, the difference between the ππ S-wave scattering lengths in the isospin I=0 and I=2 states. Higher-order ππ rescattering terms, included in the two formulations, allow also an independent, though less precise, determination of a2.
Details
Title
Determination of the S-wave π π scattering lengths from a study of K ±→π ± π 0 π 0 decays
Author
Batley, J R 1 ; Culling, A J 1 ; Kalmus, G 1 ; Lazzeroni, C 1 ; Munday, D J 1 ; Slater, M W 1 ; Wotton, S A 1 ; Arcidiacono, R 2 ; Bocquet, G 2 ; Cabibbo, N 2 ; Ceccucci, A 2 ; Cundy, D 2 ; Falaleev, V 2 ; Fidecaro, M 2 ; Gatignon, L 2 ; Gonidec, A 2 ; Kubischta, W 2 ; Norton, A 2 ; Maier, A 2 ; Patel, M 2 ; Peters, A 2 ; Balev, S 3 ; Frabetti, P L 3 ; Goudzovski, E 3 ; Hristov, P 3 ; Kekelidze, V 3 ; Kozhuharov, V 3 ; Litov, L 3 ; Madigozhin, D 3 ; Marinova, E 3 ; Molokanova, N 3 ; Polenkevich, I 3 ; Yu Potrebenikov 3 ; Stoynev, S 3 ; Zinchenko, A 3 ; Monnier, E 4 ; Swallow, E 4 ; Winston, R 4 ; Rubin, P 5 ; Walker, A 5 ; Baldini, W 6 ; A Cotta Ramusino 6 ; Dalpiaz, P 6 ; Damiani, C 6 ; Fiorini, M 6 ; Gianoli, A 6 ; Martini, M 6 ; Petrucci, F 6 ; Savrié, M 6 ; Scarpa, M 6 ; Wahl, H 6 ; Calvetti, M 7 ; Iacopini, E 7 ; Ruggiero, G 7 ; Bizzeti, A 8 ; Lenti, M 8 ; Veltri, M 8 ; Behler, M 9 ; Eppard, K 9 ; Kleinknecht, K 9 ; Marouelli, P 9 ; Masetti, L 9 ; Moosbrugger, U 9 ; C Morales Morales 9 ; Renk, B 9 ; Wache, M 9 ; Wanke, R 9 ; Winhart, A 9 ; Coward, D 10 ; Dabrowski, A 10 ; T Fonseca Martin 10 ; Shieh, M 10 ; Szleper, M 10 ; Velasco, M 10 ; Wood, M D 10 ; Anzivino, G 11 ; Imbergamo, E 11 ; Nappi, A 11 ; Piccini, M 11 ; Raggi, M 11 ; Valdata-Nappi, M 11 ; Cenci, P 12 ; Pepe, M 12 ; Petrucci, M C 12 ; Cerri, C 13 ; Fantechi, R 13 ; Collazuol, G 14 ; DiLella, L 14 ; Lamanna, G 14 ; Mannelli, I 14 ; Michetti, A 14 ; Costantini, F 15 ; Doble, N 15 ; Fiorini, L 15 ; Giudici, S 15 ; Pierazzini, G 15 ; Sozzi, M 15 ; Venditti, S 15 ; Bloch-Devaux, B 16 ; Cheshkov, C 16 ; Chèze, J B 16 ; De Beer, M 16 ; Derré, J 16 ; Marel, G 16 ; Mazzucato, E 16 ; Peyaud, B 16 ; Vallage, B 16 ; Holder, M 17 ; Ziolkowski, M 17 ; Biino, C 18 ; Cartiglia, N 18 ; Marchetto, F 18 ; Bifani, S 19 ; Clemencic, M 19 ; S Goy Lopez 19 ; Dibon, H 20 ; Jeitler, M 20 ; Markytan, M 20 ; Mikulec, I 20 ; Neuhofer, G 20 ; Widhalm, L 20
1 Cavendish Laboratory, University of Cambridge, Cambridge, UK
2 CERN, Genève 23, Switzerland
3 Joint Institute for Nuclear Research, Dubna, Moscow region, Russia
4 The Enrico Fermi Institute, The University of Chicago, Chicago, IL, USA
5 Department of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
6 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Ferrara, Ferrara, Italy
7 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Firenze, Sesto Fiorentino, Italy
8 Sezione dell’INFN di Firenze, Sesto Fiorentino, Italy
9 Institut für Physik, Universität Mainz, Mainz, Germany
10 Department of Physics and Astronomy, Northwestern University, Evanston, IL, USA
11 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Perugia, Perugia, Italy
12 Sezione dell’INFN di Perugia, Perugia, Italy
13 Sezione dell’INFN di Pisa, Pisa, Italy
14 Scuola Normale Superiore e Sezione dell’INFN di Pisa, Pisa, Italy
15 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Pisa, Pisa, Italy
16 DSM/IRFU—CEA Saclay, Gif-sur-Yvette, France
17 Fachbereich Physik, Universität Siegen, Siegen, Germany
18 Sezione dell’INFN di Torino, Torino, Italy
19 Dipartimento di Fisica Sperimentale dell’Università e Sezione dell’INFN di Torino, Torino, Italy
20 Institut für Hochenergiephysik, Österreichische Akademie der Wissenschaften, Wien, Austria
1 Cavendish Laboratory, University of Cambridge, Cambridge, UK
2 CERN, Genève 23, Switzerland
3 Joint Institute for Nuclear Research, Dubna, Moscow region, Russia
4 The Enrico Fermi Institute, The University of Chicago, Chicago, IL, USA
5 Department of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
6 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Ferrara, Ferrara, Italy
7 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Firenze, Sesto Fiorentino, Italy
8 Sezione dell’INFN di Firenze, Sesto Fiorentino, Italy
9 Institut für Physik, Universität Mainz, Mainz, Germany
10 Department of Physics and Astronomy, Northwestern University, Evanston, IL, USA
11 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Perugia, Perugia, Italy
12 Sezione dell’INFN di Perugia, Perugia, Italy
13 Sezione dell’INFN di Pisa, Pisa, Italy
14 Scuola Normale Superiore e Sezione dell’INFN di Pisa, Pisa, Italy
15 Dipartimento di Fisica dell’Università e Sezione dell’INFN di Pisa, Pisa, Italy
16 DSM/IRFU—CEA Saclay, Gif-sur-Yvette, France
17 Fachbereich Physik, Universität Siegen, Siegen, Germany
18 Sezione dell’INFN di Torino, Torino, Italy
19 Dipartimento di Fisica Sperimentale dell’Università e Sezione dell’INFN di Torino, Torino, Italy
20 Institut für Hochenergiephysik, Österreichische Akademie der Wissenschaften, Wien, Austria
Pages
589-608
Publication year
2009
Publication date
Dec 2009
ISSN
14346044
e-ISSN
14346052
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2294029392
Copyright
The European Physical Journal C is a copyright of Springer, (2009). All Rights Reserved.