| Article | |
| Report number | arXiv:0711.4313 ; CERN-PH-EP-2007-033 ; CERN-PH-EP-2007-033 |
| Title | First observation and measurement of the decay $K^{\pm} \to\pi^{\pm}e^{+}e^{-}\gamma$ |
| Author(s) |
Batley, J.R. (Cambridge U.) ; Culling, A.J. (Cambridge U.) ; Kalmus, George E. (Cambridge U.) ; Lazzeroni, Cristina (Cambridge U.) ; Munday, D.J. (Cambridge U.) ; Slater, M.W. (Cambridge U.) ; Wotton, S.A. (Cambridge U.) ; Arcidiacono, Roberta (CERN) ; Bocquet, G. (CERN) ; Cabibbo, N. (CERN) ; Ceccucci, Augusto (CERN) ; Cundy, D. (CERN) ; Falaleev, V. (CERN) ; Fidecaro, M. (CERN) ; Gatignon, L. (CERN) ; Gonidec, A. (CERN) ; Kubischta, W. (CERN) ; Norton, A. (CERN) ; Maier, A. (CERN) ; Patel, M. (CERN) ; Peters, A. (CERN) ; Balev, S. (Dubna, JINR) ; Frabetti, P.L. (Dubna, JINR) ; Goudzovski, E. (Dubna, JINR) ; Hristov, Peter (Dubna, JINR) ; Kekelidze, V. (Dubna, JINR) ; Kozhuharov, V. (Dubna, JINR) ; Litov, Leandar (Dubna, JINR) ; Madigozhin, D. (Dubna, JINR) ; Marinova, E. (Dubna, JINR) ; Molokanova, N. (Dubna, JINR) ; Polenkevich, I. (Dubna, JINR) ; Stoynev, S. (Dubna, JINR) ; Zinchenko, A. (Dubna, JINR) ; Monnier, E. (Chicago U.) ; Swallow, E. (Chicago U.) ; Winston, R. (Chicago U.) ; Rubin, Philip D. (Edinburgh U.) ; Walker, A. (Edinburgh U.) ; Baldini, W. (Ferrara U. ; INFN, Ferrara) ; Cotta Ramusino, A. (Ferrara U. ; INFN, Ferrara) ; Dalpiaz, P. (Ferrara U. ; INFN, Ferrara) ; Damiani, C. (Ferrara U. ; INFN, Ferrara) ; Fiorini, M. (Ferrara U. ; INFN, Ferrara) ; Gianoli, Alberto (Ferrara U. ; INFN, Ferrara) ; Martini, M. (Ferrara U. ; INFN, Ferrara) ; Petrucci, F. (Ferrara U. ; INFN, Ferrara) ; Savrie, M. (Ferrara U. ; INFN, Ferrara) ; Scarpa, M. (Ferrara U. ; INFN, Ferrara) ; Wahl, H. (Ferrara U. ; INFN, Ferrara) ; Bizzeti, A. (Florence U. ; INFN, Florence) ; Calvetti, M. (Florence U. ; INFN, Florence) ; Celeghini, Enrico (Florence U. ; INFN, Florence) ; Iacopini, E. (Florence U. ; INFN, Florence) ; Lenti, M. (Florence U. ; INFN, Florence) ; Martelli, F. (Florence U. ; INFN, Florence) ; Ruggiero, G. (Florence U. ; INFN, Florence) ; Veltri, M. (Florence U. ; INFN, Florence) ; Behler, M. (Mainz U., Inst. Phys.) ; Eppard, K. (Mainz U., Inst. Phys.) ; Handel, C. (Mainz U., Inst. Phys.) ; Kleinknecht, Konrad (Mainz U., Inst. Phys.) ; Marouelli, P. (Mainz U., Inst. Phys.) ; Masetti, L. (Mainz U., Inst. Phys.) ; Moosbrugger, U. (Mainz U., Inst. Phys.) ; Morales Morales, C. (Mainz U., Inst. Phys.) ; Renk, B. (Mainz U., Inst. Phys.) ; Wache, M. (Mainz U., Inst. Phys.) ; Wanke, R. (Mainz U., Inst. Phys.) ; Winhart, A. (Mainz U., Inst. Phys.) ; Coward, D.H. (Northwestern U.) ; Dabrowski, A. (Northwestern U.) ; Fonseca Martin, T. (Northwestern U.) ; Shieh, M. (Northwestern U.) ; Szleper, M. (Northwestern U.) ; Velasco, M. (Northwestern U.) ; Wood, M.D. (Northwestern U.) ; Anzivino, Giuseppina (Perugia U. ; INFN, Perugia) ; Cenci, P. (Perugia U. ; INFN, Perugia) ; Imbergamo, E. (Perugia U. ; INFN, Perugia) ; Nappi, Nello (Perugia U. ; INFN, Perugia) ; Pepe, M. (Perugia U. ; INFN, Perugia) ; Petrucci, M.C. (Perugia U. ; INFN, Perugia) ; Piccini, M. (Perugia U. ; INFN, Perugia) ; Raggi, M. (Perugia U. ; INFN, Perugia) ; Valdata-Nappi, Marisa (Perugia U. ; INFN, Perugia) ; Cerri, C. (Pisa U. ; INFN, Pisa) ; Collazuol, G. (Pisa U. ; INFN, Pisa) ; Costantini, Flavio (Pisa U. ; INFN, Pisa) ; Di, L. (Pisa U. ; INFN, Pisa) ; Doble, Niels (Pisa U. ; INFN, Pisa) ; Fantechi, R. (Pisa U. ; INFN, Pisa) ; Fiorini, L. (Pisa U. ; INFN, Pisa) ; Giudici, S. (Pisa U. ; INFN, Pisa) ; Lamanna, G. (Pisa U. ; INFN, Pisa) ; Mannelli, Italo (Pisa U. ; INFN, Pisa) ; Michetti, A. (Pisa U. ; INFN, Pisa) ; Pierazzini, G. (Pisa U. ; INFN, Pisa) ; Sozzi, Marco S. (Pisa U. ; INFN, Pisa) ; Bloch-Devaux, Brigitte (DSM, DAPNIA, Saclay) ; Cheshkov, C. (DSM, DAPNIA, Saclay) ; Cheze, J.B. (DSM, DAPNIA, Saclay) ; De Beer, M. (DSM, DAPNIA, Saclay) ; Derre, J. (DSM, DAPNIA, Saclay) ; Marel, G. (DSM, DAPNIA, Saclay) ; Mazzucato, E. (DSM, DAPNIA, Saclay) ; Peyaud, B. (DSM, DAPNIA, Saclay) ; Vallage, B. (DSM, DAPNIA, Saclay) ; Holder, M. (Siegen U.) ; Ziolkowski, M. (Siegen U.) ; Bifani, S. (Turin U. ; INFN, Turin) ; Biino, C. (Turin U. ; INFN, Turin) ; Cartiglia, N. (Turin U. ; INFN, Turin) ; Clemencic, M. (Turin U. ; INFN, Turin) ; Goy Lopez, S. (Turin U. ; INFN, Turin) ; Marchetto, Flavio Pietro (Turin U. ; INFN, Turin) ; Dibon, Heinz (Vienna, OAW) ; Jeitler, Manfred (Vienna, OAW) ; Markytan, M. (Vienna, OAW) ; Mikulec, I. (Vienna, OAW) ; Neuhofer, G. (Vienna, OAW) ; Widhalm, L. (Vienna, OAW) |
| Affiliation | (Cavendish Laboratory, University of Cambridge, Cambridge, UK) ; (CERN) ; (Joint Institute for Nuclear Research, Dubna, Russian Federation) ; (The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois, USA) ; (Department of Physics and Astronomy University of Edinburgh, JCMB King's Buildings, Mayoeld Road, Edinburgh, UK) ; (Dipartimento di Fisica dell' Universite Sezione dell' INFN di Ferrara, Ferrara, Italy) ; (Dipartimento di Fisica dell' Universite Sezione dell' INFN di Firenze, Firenze, Italy) ; (Institut fur Physik, Universitat Mainz, Mainz, Germany) ; (Department of Physics and Astronomy Northwestern University, Evanston Illinois, USA) ; (Dipartimento di Fisica dell' Universita e Sezione dell' INFN di Perugia, Perugia, Italy) ; (Dipartimento di Fisica dell' Universita, Scuola Normale Superiore e Sezione dell' INFN di Pisa, Pisa, Italy) ; (DSM/DAPNIA-CEA Saclay, Gif-sur-Yvette, France) ; (Fachbereich Physik, Universitat Siegen, Siegen, Germany) ; (Dipartimento di Fisica Sperimentale dell' Universita e Sezione dell' INFN di Torino, Torino, Italy) ; (Osterreichische Akademie der Wissenschaften, Institut fur Hochenergiephysik, Wien, Austria) |
| Publication | 2008 |
| Imprint | 04 Oct 2007 |
| Number of pages | 13 |
| Note | revised version submitted on 2008-01-11 16:44:15 13 pages, 3 figures. Accepted for publication in Phys.Lett.B |
| In: | Phys. Lett. B 659 (2008) 493-499 |
| DOI | 10.1016/j.physletb.2007.11.075 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN SPS ; NA48/2 |
| Abstract | Using the full data set of the NA48/2 experiment, the decay $K^{\pm} \rightarrow \pi^{\pm} e^{+} e^{-}\gamma$ is observed for the first time, selecting 120 candidates with $7.3 \pm 1.7$ estimated background events. With $K^{\pm} \rightarrow \pi^{\pm} \pi^{0}_{D}$ as normalisation channel, the branching ratio is determined in a model-independent way to be Br$(K^{\pm} \rightarrow \pi^{\pm} e^{+} e^{-}\gamma, m_{ee\gamma} > 260$ MeV/c$^{2}) = (1.19 \pm 0.12_{stat} \pm 0.04_{syst}) \times 10^{-8}$. This measured value and the spectrum of the $e^{+}e^{-}\gamma$ invariant mass allow a comparison with predictions of Chiral Perturbation Theory. |
| Copyright/License | Elsevier B.V. |
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ჩანაწერი შექმნილია 2007-11-28, ბოლოს შესწორებულია 2024-05-08
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