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

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.; Falaleev, V.; Fidecaro, M.; 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.; Savrié, M.; Scarpa, M.; Wahl, H.; Baldini, W.; Cotta Ramusino, A.; 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.; Morales Morales, 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.; Bloch-Devaux, B.; Cheshkov, C.; Chèze, J. B.; De Beer, M.; Derré, J.; Marel, G.; Mazzucato, E.; Peyaud, B.; Vallage, B.; Holder, M.; Ziolkowski, M.; Bifani, S.; Clemencic, M.; Goy Lopez, S.; Biino, C.; Cartiglia, N.; Marchetto, F.; Dibon, H.; Jeitler, M.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Widhalm, L.

doi:10.1016/j.physletb.2018.11.046

Title: First observation and study of the K^±→π^±π⁰e⁺e^- decay

Journal Article · 10 January 2019 · Physics Letters B

DOI: https://doi.org/10.1016/j.physletb.2018.11.046 · OSTI ID:1493323

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.; Falaleev, V.; Fidecaro, M.; Gatignon, L.; Gonidec, A.; Kubischta, W.; Maier, A.; Norton, A.; Patel, M.; Peters, A. more »

The NA48/2 experiment at CERN reports the first observation of the ^±→π^±π⁰e⁺e^- decay from an exposure of 1.7 x 10¹¹ 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^± → π^±π⁰e⁺e^- = (4.24 ± 0.14) x 10^-6. Finally 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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: The NA48/2 Collaboration

Grant/Contract Number:: AC02-76SF00515; PPA/G/O/1999/00559; UF100308; UF0758946; 336581; DID02-22; 05HK1UM1/1; 056SI74; GZ 616.360/2-IV GZ 616.363/2-VIII; P08929-PHY

OSTI ID:: 1493323

Journal Information:: Physics Letters B, Vol. 788, Issue C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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Cited By (1)

Precise determination of the branching ratio of the neutral-pion Dalitz decay Husek, Tomáš; Goudzovski, Evgueni; Kampf, Karol arXiv https://doi.org/10.48550/arxiv.1809.01153	text	January 2018