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On the dispersive two-photon \(K_L\rightarrow \mu^+ \mu^-\) amplitude

  • J.O. Eeg
  • K. Kumerički
  • I. Picek
Theoretical physics

Abstract.

We present a full account of the two-loop electroweak, two-photon mediated short-distance dispersive \(K_L \rightarrow\mu^+\mu^-\) decay amplitude. QCD corrections change the sign of this amplitude and reduce it by an order of magnitude. Thus, the QCD-corrected two-loop amplitude represents only a small fraction (with the central value of 5%) of the one-loop weak short-distance contribution, and has the same sign. In combination with a recent measurement, the standard-model prediction of the short-distance amplitude, completed in this paper, provides a constraint on the otherwise uncertain long-distance dispersive amplitude.

Keywords

Full Account Recent Measurement Decay Amplitude Dispersive Amplitude Dispersive Decay 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • J.O. Eeg
    • 1
  • K. Kumerički
    • 2
  • I. Picek
    • 2
  1. 1. Department of Physics, University of Oslo, N-0316 Oslo, Norway (e-mail: j.o.eeg@fys.uio.no) NO
  2. 2. Department of Physics, Faculty of Science, University of Zagreb, POB 162, HR-10001 Zagreb, Croatia (e-mail: kkumer@phy.hr, picek@phy.hr) HR

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