Measurement of the direct CP-violating charge asymmetry in Ds ± â Ï π ± decays.
Phys Rev Lett
; 112(11): 111804, 2014 Mar 21.
Article
em En
| MEDLINE
| ID: mdl-24702352
ABSTRACT
We present a measurement of the direct CP-violating charge asymmetry in Ds+ â Ï π(±) decays where the Ï meson decays to K(+)K(-), using the full Run II data set with an integrated luminosity of 10.4 fb-1 of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. The normalized difference A(CP) in the yield of D(s)(+) and D(s)(-) mesons in these decays is measured by fitting the difference between their reconstructed invariant mass distributions. This results in an asymmetry of A(CP) = [-0.38 ± 0.27]%, which is the most precise measurement of this quantity to date. The result is consistent with the standard model prediction of zero CP asymmetry in this decay.
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01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
Federação Russa