On the dispersive two-photon K_L -> mu^+ mu^- amplitude (CROSBI ID 80891)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Eeg, Jan O. ; Kumerički, Krešimir ; Picek, Ivica
engleski
On the dispersive two-photon K_L -> mu^+ mu^- amplitude
We present a full account of the two-loop electroweak, two-photon mediated short-distance dispersive K_L -> 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.
kaon decay; muon; dispersive amplitude; QCD corrections
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Podaci o izdanju
1 (3-4)
1998.
531-537-x
objavljeno
1434-6044
10.1007/s100520050102