Long Distance Contributions to the Decay K+ ---> pi+ Neutrino anti-neutrino

Jan, 1989
19 pages
Published in:
  • Phys.Rev.D 39 (1989) 3325
Report number:
  • PITHA-89/03

Citations per year

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Abstract: (APS)
We calculate two distinct long-distance contributions to the decay K+→π+νν¯: (i) that arising from the intermediate states πl and Dl and (ii) that associated with hadronic contributions to the KπZ vertex. A combined branching ratio of 0.7×10−13 is obtained (for three neutrino species), to be compared with the short-distance estimate (1–8)×10−10. A remark is made on the energy spectrum of the pion.
  • K+: SEMILEPTONIC DECAY
  • SEMILEPTONIC DECAY: K+
  • K+: BRANCHING RATIO
  • K+: WIDTH
  • FINAL STATE: (PI LEPTON)
  • (PI LEPTON): FINAL STATE
  • FINAL STATE: (D LEPTON)
  • (D LEPTON): FINAL STATE
  • ENERGY SPECTRUM: (PI)
  • (PI): ENERGY SPECTRUM