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Measurement of structure-dependent K+ --> &mgr;(+)nu(&mgr;)gamma decay

Adler1, Atiya, Chiang

  • 1Brookhaven National Laboratory, Upton, New York 11973, USA.

Physical Review Letters
|September 8, 2000
PubMed
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Researchers measured a structure-dependent component in the rare Kaon (K+) decay into a muon (μ+) and neutrino (νμ) with a photon (γ). This study provides crucial data on fundamental particle interactions and the Standard Model.

Area of Science:

  • Particle Physics
  • High Energy Physics
  • Kaon Decays

Background:

  • Kaon decays offer insights into the Standard Model of particle physics.
  • Understanding rare decays like K+ → μ+νμγ is crucial for testing theoretical predictions.

Purpose of the Study:

  • To report the first measurement of the structure-dependent component in the K+ → μ+νμγ decay.
  • To determine the absolute value of the sum of vector and axial-vector form factors, |F(V)+F(A)|.
  • To calculate the branching ratio for this specific decay mode.

Main Methods:

  • Analysis of the K+ → μ+νμγ decay in a specific kinematic region.
  • Selection criteria based on muon kinetic energy (>137 MeV) and photon energy (>90 MeV).
  • Extraction of form factor values and branching ratio from experimental data.

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Main Results:

  • The absolute value of the sum of vector and axial-vector form factors was determined to be |F(V)+F(A)| = 0.165 ± 0.007 ± 0.011.
  • The branching ratio for the structure-dependent positive component was found to be B(SD+) = (1.33 ± 0.12 ± 0.18) × 10^-5.
  • A 90% confidence level limit was set for the difference between vector and axial-vector form factors: -0.04 < F(V)-F(A) < 0.24.

Conclusions:

  • This study presents the first measurement of a structure-dependent component in K+ → μ+νμγ decay.
  • The results provide valuable experimental data for refining theoretical models of weak interactions.
  • The findings contribute to a more precise understanding of fundamental particle physics parameters.