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

Abstract

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.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
The NA48/2 Collaboration
OSTI Identifier:
1493323
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
Resource Type:
Accepted Manuscript
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Volume: 788; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

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., and Widhalm, L. First observation and study of the K±→π±π0e+e- decay. United States: N. p., 2019. Web. doi:10.1016/j.physletb.2018.11.046.
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. First observation and study of the K±→π±π0e+e- decay. United States. https://doi.org/10.1016/j.physletb.2018.11.046
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., and Widhalm, L. Thu . "First observation and study of the K±→π±π0e+e- decay". United States. https://doi.org/10.1016/j.physletb.2018.11.046. https://www.osti.gov/servlets/purl/1493323.
@article{osti_1493323,
title = {First observation and study of the K±→π±π0e+e- decay},
author = {Batley, J. R. and Kalmus, G. and Lazzeroni, C. and Munday, D. J. and Slater, M. W. and Wotton, S. A. and Arcidiacono, R. and Bocquet, G. and Cabibbo, N. and Ceccucci, A. and Cundy, D. and Falaleev, V. and Fidecaro, M. and Gatignon, L. and Gonidec, A. and Kubischta, W. and Maier, A. and Norton, A. and Patel, M. and Peters, A. and Balev, S. and Frabetti, P. L. and Gersabeck, E. and Goudzovski, E. and Hristov, P. and Kekelidze, V. and Kozhuharov, V. and Litov, L. and Madigozhin, D. and Misheva, M. and Molokanova, N. and Polenkevich, I. and Potrebenikov, Yu. and Stoynev, S. and Zinchenko, A. and Monnier, E. and Swallow, E. and Winston, R. and Rubin, P. and Walker, A. and Dalpiaz, P. and Damiani, C. and Fiorini, M. and Martini, M. and Petrucci, F. and Savrié, M. and Scarpa, M. and Wahl, H. and Baldini, W. and Cotta Ramusino, A. and Gianoli, A. and Calvetti, M. and Celeghini, E. and Iacopini, E. and Lenti, M. and Ruggiero, G. and Bizzeti, A. and Veltri, M. and Behler, M. and Eppard, K. and Hita-Hochgesand, M. and Kleinknecht, K. and Marouelli, P. and Masetti, L. and Moosbrugger, U. and Morales Morales, C. and Renk, B. and Wache, M. and Wanke, R. and Winhart, A. and Coward, D. and Dabrowski, A. and Fonseca Martin, T. and Shieh, M. and Szleper, M. and Velasco, M. and Wood, M. D. and Anzivino, G. and Imbergamo, E. and Nappi, A. and Piccini, M. and Raggi, M. and Valdata-Nappi, M. and Cenci, P. and Pepe, M. and Petrucci, M. C. and Costantini, F. and Doble, N. and Fiorini, L. and Giudici, S. and Pierazzini, G. and Sozzi, M. and Venditti, S. and Collazuol, G. and DiLella, L. and Lamanna, G. and Mannelli, I. and Michetti, A. and Cerri, C. and Fantechi, R. and Bloch-Devaux, B. and Cheshkov, C. and Chèze, J. B. and De Beer, M. and Derré, J. and Marel, G. and Mazzucato, E. and Peyaud, B. and Vallage, B. and Holder, M. and Ziolkowski, M. and Bifani, S. and Clemencic, M. and Goy Lopez, S. and Biino, C. and Cartiglia, N. and Marchetto, F. and Dibon, H. and Jeitler, M. and Markytan, M. and Mikulec, I. and Neuhofer, G. and Widhalm, L.},
abstractNote = {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.},
doi = {10.1016/j.physletb.2018.11.046},
journal = {Physics Letters B},
number = C,
volume = 788,
place = {United States},
year = {2019},
month = {1}
}

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Figures / Tables:

Figure 1 Figure 1: Normalization candidates. Left: reconstructed γe+e mass. Right: reconstructed π±π$^{0}_{D}$ mass. Full dots correspond to data candidates; stacked histograms are, from bottom to top, the expected Kµ3D (green) and Ke3D (blue) backgrounds multiplied by a factor of 50 to be visible. The normalization simulation (red) includes radiative effects inmore » both kaon and π$^{0}_{D}$ decays that reproduce the asymmetric tails of both distributions.« less

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Works referencing / citing this record:

Precise Determination of the Branching Ratio of the Neutral-Pion Dalitz Decay
journal, January 2019


Precise determination of the branching ratio of the neutral-pion Dalitz decay
text, January 2018


Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.