First observation and study of the K± → π±π0e+e− decay

Autor: Batley, J. R., Kalmus, G., Lazzeroni, C., Munday, D. J., Slater, M. W., Wotton, S. A., Arcidiacono, R., Bocquet, G., Cabibbo, N., Ceccucci, A., Cundy, D., Bloch-Devaux, B., Cheshkov, C., Cheze, J. B., De Beer, M., Derre, J., Marel, G., Mazzucato, E., Peyaud, B., Vallage, B., Holder, M., Falaleev, V., Ziolkowski, M., Bifani, S., Clemencic, M., Lopez, S. Goy, Biino, C., Cartiglia, N., Marchetto, F., Dibon, H., Jeitler, M., Markytan, M., Fidecaro, M., Mikulec, I., Neuhofer, G., Widhalm, L., NA48/2 Collaboration, Gatignon, L., Gonidec, A., Kubischta, W., Maier, A., Norton, A., Patel, M., Peters, A., Balev, S., Frabetti, P. L., Gersabeck, E., Goudzovski, E., Hristov, P., Kekelidze, V., Kozhuharov, V., Litov, L., Madigozhin, D., Misheva, M., Molokanova, N., Polenkevich, I., Potrebenikov, Yu., Stoynev, S., Zinchenko, A., Monnier, E., Swallow, E., Winston, R., Rubin, P., Walker, A., Dalpiaz, P., Damiani, C., Fiorini, M., Martini, M., Petrucci, F., Savrie, M., Scarpa, M., Wahl, H., Baldini, W., Ramusino, A. Cotta, Gianoli, A., Calvetti, M., Celeghini, E., Iacopini, E., Lenti, M., Ruggiero, G., Bizzeti, A., Veltri, M., Behler, M., Eppard, K., Hita-Hochgesand, M., Kleinknecht, K., Marouelli, P., Masetti, L., Moosbrugger, U., MoralesMorales, C., Renk, B., Wache, M., Wanke, R., Winhart, A., Coward, D., Dabrowski, A., Fonseca Martin, T., Shieh, M., Szleper, M., Velasco, M., Wood, M. D., Anzivino, G., Imbergamo, E., Nappi, A., Piccini, M., Raggi, M., Valdata-Nappi, M., Cenci, P., Pepe, M., Petrucci, M. C., Costantini, F., Doble, N., Fiorini, L., Giudici, S., Pierazzini, G., Sozzi, M., Venditti, S., Collazuol, G., DiLella, L., Lamanna, G., Mannelli, I., Michetti, A., Cerri, C., Fantechi, R.
Jazyk: angličtina
Rok vydání: 2019
Předmět:
rare decay
Nuclear and High Energy Physics
Chiral perturbation theory
CP violation
Monte-Carlo
search
Astronomy & Astrophysics
Space (mathematics)
quark mixing
01 natural sciences
Partícules (Física nuclear)
Charged Kaon decays
Physics
Particles & Fields
Charged Kaon decays
quark mixing
radiative kaon decay
chiral perturbation theory
Economica
0202 Atomic
Molecular
Nuclear
Particle And Plasma Physics
Violació CP (Física nuclear)
MONTE-CARLO
SEARCH
0103 physical sciences
Kaon decays
radiative kaon decay
010306 general physics
Physics
Science & Technology
010308 nuclear & particles physics
Branching fraction
Kaon decays
Chiral Perturbation Theory
Ambientale
K meson
Nuclear & Particles Physics
Chiral Perturbation Theory
lcsh:QC1-999
fixed target experiment
Physics
Nuclear
Physical Sciences
K meson
rare decay
fixed target experiment
High Energy Physics::Experiment
CP VIOLATION
Atomic physics
lcsh:Physics
Zdroj: Physics Letters B, Vol 788, Iss, Pp 552-561 (2019)
The NA48/2 Collaboration Batley, J. R. Fiorini, Luca 2019 First observation and study of the K± → π±π0e+e− decay Physics Letters B 788 552 561
RODERIC. Repositorio Institucional de la Universitat de Valéncia
instname
Digital.CSIC. Repositorio Institucional del CSIC
RODERIC: Repositorio Institucional de la Universitat de Valéncia
ISSN: 0370-2693
Popis: The NA48/2 experiment at CERN reports the first observation of the K-+/- -> pi(+/-)pi(0)e(+)e(-) decay from an exposure of 1.7 x 10(11) charged kaon decays recorded in 2003-2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR(K-+/- -> pi(+/-)pi(0)e(+)e(-)) = (4.24 +/- 0.14) x 10(-6). The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated.
We gratefully acknowledge the CERN SPS accelerator and beam line staff for the excellent performance of the beam and the technical staff of the participating institutes for their efforts in the maintenance and operation of the detector, and data processing. We thank M. Koval for making the “Prague” radiative Dalitz decay code available in the NA48/2 simulation software. Discussions with G. D'Ambrosio and O. Catà were most stimulating in clarifying the impact of interference terms on our measurement.
Databáze: OpenAIRE
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