First observation and study of the K±→ π0π0μ±ν decay

The NA48/2 collaboration anna.korotkova@cern.ch dmitry.madigozhin@cern.ch

doi:10.1007/JHEP03(2024)137

First observation and study of the K^±→ π⁰π⁰μ^±ν decay

The NA48/2 collaboration [email protected] [email protected]

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

The NA48/2 experiment at CERN reports the first observation of the K^± → π⁰π⁰μ^±ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in the kinematic region of the squared dilepton mass above 0.03 GeV²/c⁴ is measured to be (0.65 ± 0.03) × 10⁻⁶. The extrapolation to the full kinematic space, using a specific model, is found to be (3.45 ± 0.16) × 10⁻⁶, in agreement with chiral perturbation theory predictions.

Original language	English (US)
Article number	137
Journal	Journal of High Energy Physics
Volume	2024
Issue number	3
DOIs	https://doi.org/10.1007/JHEP03(2024)137
State	Published - Mar 2024

Funding

The cost of the experiment and its auxiliary systems was supported by the funding agencies of the Collaboration Institutes. We are particularly indebted to: the U.K. Particle Physics and Astronomy Research Council, grant PPA/G/O/1999/00559; the German Federal Minister for Education and Research (BMBF) under contracts 05HK1UM1/1 and 056SI74; the Austrian Ministry for Traffic and Research under the contracts GZ 616.360/2-IV and GZ 616.363/2-VIII, and by the Fonds f\u00FCr Wissenschaft und Forschung FWF Nr. P08929-PHY; INFN (Istituto Nazionale di Fisica Nucleare), Italy; CERN (European Organization for Nuclear Research), Switzerland; ERC (European Research Council) \u201CKaonLepton\u201D starting grant 336581, Europe. Individuals have received support from: the Bulgarian National Science Fund under contract DID02-22; the Royal Society (grants UF100308, UF0758946), United Kingdom; ERC Starting Grant 336581, Europe.

Keywords

Branching fraction
Fixed Target Experiments
Rare Decay

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1007/JHEP03(2024)137

Cite this

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title = "First observation and study of the K±→ π0π0μ±ν decay",

abstract = "The NA48/2 experiment at CERN reports the first observation of the K± → π0π0μ±ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in the kinematic region of the squared dilepton mass above 0.03 GeV2/c4 is measured to be (0.65 ± 0.03) × 10−6. The extrapolation to the full kinematic space, using a specific model, is found to be (3.45 ± 0.16) × 10−6, in agreement with chiral perturbation theory predictions.",

keywords = "Branching fraction, Fixed Target Experiments, Rare Decay",

author = "{The NA48/2 collaboration [email protected] [email protected]} and Batley, {J. R.} and G. Kalmus and C. Lazzeroni and Munday, {D. J.} and Slater, {M. W.} and Wotton, {S. A.} and R. Arcidiacono and G. Bocquet and N. Cabibbo and A. Ceccucci and D. Cundy and V. Falaleev and M. Fidecaro and L. Gatignon and A. Gonidec and W. Kubischta and A. Maier and A. Norton and M. Patel and A. Peters and E. Monnier and E. Swallow and R. Winston and P. Rubin and A. Walker and P. Dalpiaz and C. Damiani and M. Fiorini and M. Martini and F. Petrucci and M. Savri{\'e} and M. Scarpa and H. Wahl and W. Baldini and {Cotta Ramusino}, A. and A. Gianoli and M. Calvetti and E. Celeghini and E. Iacopini and M. Lenti and G. Ruggiero and A. Bizzeti and M. Veltri and M. Behler and K. Eppard and M. Hita-Hochgesand and K. Kleinknecht and P. Marouelli and L. Masetti and M. Velasco",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2024.",

year = "2024",

month = mar,

doi = "10.1007/JHEP03(2024)137",

language = "English (US)",

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AU - Kalmus, G.

AU - Lazzeroni, C.

AU - Munday, D. J.

AU - Slater, M. W.

AU - Wotton, S. A.

AU - Arcidiacono, R.

AU - Bocquet, G.

AU - Cabibbo, N.

AU - Ceccucci, A.

AU - Cundy, D.

AU - Falaleev, V.

AU - Fidecaro, M.

AU - Gatignon, L.

AU - Gonidec, A.

AU - Kubischta, W.

AU - Maier, A.

AU - Norton, A.

AU - Patel, M.

AU - Peters, A.

AU - Monnier, E.

AU - Swallow, E.

AU - Winston, R.

AU - Rubin, P.

AU - Walker, A.

AU - Dalpiaz, P.

AU - Damiani, C.

AU - Fiorini, M.

AU - Martini, M.

AU - Petrucci, F.

AU - Savrié, M.

AU - Scarpa, M.

AU - Wahl, H.

AU - Baldini, W.

AU - Cotta Ramusino, A.

AU - Gianoli, A.

AU - Calvetti, M.

AU - Celeghini, E.

AU - Iacopini, E.

AU - Lenti, M.

AU - Ruggiero, G.

AU - Bizzeti, A.

AU - Veltri, M.

AU - Behler, M.

AU - Eppard, K.

AU - Hita-Hochgesand, M.

AU - Kleinknecht, K.

AU - Marouelli, P.

AU - Masetti, L.

AU - Velasco, M.

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AB - The NA48/2 experiment at CERN reports the first observation of the K± → π0π0μ±ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in the kinematic region of the squared dilepton mass above 0.03 GeV2/c4 is measured to be (0.65 ± 0.03) × 10−6. The extrapolation to the full kinematic space, using a specific model, is found to be (3.45 ± 0.16) × 10−6, in agreement with chiral perturbation theory predictions.

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KW - Fixed Target Experiments

KW - Rare Decay

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