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On the dispersive two-photon K_L -> mu^+ mu^- amplitude (CROSBI ID 80891)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Eeg, Jan O. ; Kumerički, Krešimir ; Picek, Ivica On the dispersive two-photon K_L -> mu^+ mu^- amplitude // European physical journal C : particles and fields, 1 (1998), 3-4; 531-537-x. doi: 10.1007/s100520050102

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

Povezanost rada

Fizika

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