First observation and study of the K± → π0π0μ±ν decay
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期刊论文
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出版模式:
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发表日期:
2024年3月22日
- J. R. Batley,
- G. Kalmus,
- C. Lazzeroni,
- D. J. Munday,
- M. W. Slater,
- S. A. Wotton,
- R. Arcidiacono,
- G. Bocquet,
- N. Cabibbo,
- A. Ceccucci,
- D. Cundy,
- V. Falaleev,
- M. Fidecaro,
- L. Gatignon,
- A. Gonidec,
- W. Kubischta,
- A. Maier,
- A. Norton,
- M. Patel,
- A. Peters,
- E. Monnier,
- E. Swallow,
- R. Winston,
- P. Rubin,
- A. Walker,
- P. Dalpiaz,
- C. Damiani,
- M. Fiorini,
- M. Martini,
- F. Petrucci,
- M. Savrié,
- M. Scarpa,
- H. Wahl,
- W. Baldini,
- A. Cotta Ramusino,
- A. Gianoli,
- M. Calvetti,
- E. Celeghini,
- E. Iacopini,
- M. Lenti,
- G. Ruggiero,
- A. Bizzeti,
- M. Veltri,
- M. Behler,
- K. Eppard,
- M. Hita-Hochgesand,
- K. Kleinknecht,
- P. Marouelli,
- L. Masetti,
- U. Moosbrugger,
- C. Morales Morales,
- B. Renk,
- M. Wache,
- R. Wanke,
- A. Winhart,
- D. Coward,
- A. Dabrowski,
- T. Fonseca Martin,
- M. Shieh,
- M. Szleper,
- M. Velasco,
- M. D. Wood,
- G. Anzivino,
- E. Imbergamo,
- A. Nappi,
- M. Piccini,
- M. Raggi,
- M. Valdata-Nappi,
- P. Cenci,
- M. Pepe,
- M. C. Petrucci,
- F. Costantini,
- N. Doble,
- L. Fiorini,
- S. Giudici,
- G. Pierazzini,
- M. Sozzi,
- S. Venditti,
- G. Collazuol,
- L. Di Lella,
- G. Lamanna,
- I. Mannelli,
- A. Michetti,
- C. Cerri,
- R. Fantechi,
- B. Bloch-Devaux,
- C. Cheshkov,
- J. B. Chèze,
- M. De Beer,
- J. Derré,
- G. Marel,
- E. Mazzucato,
- B. Peyaud,
- B. Vallage,
- M. Holder,
- M. Ziolkowski,
- S. Bifani,
- M. Clemencic,
- S. Goy Lopez,
- C. Biino,
- N. Cartiglia,
- F. Marchetto,
- H. Dibon,
- M. Jeitler,
- M. Markytan,
- I. Mikulec,
- G. Neuhofer,
- L. Widhalm,
- S. Balev,
- P. L. Frabetti,
- E. Gersabeck,
- E. Goudzovski,
- P. Hristov,
- V. Kekelidze,
- A. Korotkova,
- V. Kozhuharov,
- L. Litov,
- D. Madigozhin,
- N. Molokanova,
- I. Polenkevich,
- Yu. Potrebenikov,
- S. Stoynev,
- A. Zinchenko
摘要
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.