INVESTIGADORES
GOMEZ DUMM Daniel Alberto
artículos
Título:
LAB observables for the muon polarization in K+ -> pi+ mu+ mu-
Autor/es:
DANIEL GOMEZ DUMM; JORDI VIDAL
Revista:
PHYSICS LETTERS B
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 1999 vol. 463 p. 309 - 316
ISSN:
0370-2693
Resumen:
We analyse the muon longitudinal polarization asymmetry Delta_{long} in the decay K+ -> pi+ mu+ mu-. It is stressed that, since the muon helicities are not Lorentz-invariant quantities, the magnitude of Delta_{long}depends in general on the reference frame. We consider the muon helicities in the LAB system, and study the sensitivity of the longitudinal polarization asymmetry to the flavour-mixingparameters in the Standard Model for stopped and in--flight decaying K+. A similar analysis is carried out for the decay KL -> mu+ mu-. We find that in both cases the asymmetry is diluted when increasing the energy of the decaying kaons.
