info:eu-repo/semantics/article
Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ0b→J/ψ+Λ0 with the ATLAS detector
Fecha
2014-04Registro en:
Aad, G.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdinov, O.; et al.; Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ0b→J/ψ+Λ0 with the ATLAS detector; American Physical Society; Physical Review D: Particles, Fields, Gravitation and Cosmology; D89; 4-2014; 092009-34
1550-7998
CONICET Digital
CONICET
Autor
Aad, G.
Abbott, B.
Abdallah, J.
Abdel Khalek, S.
Abdinov, O.
Otero y Garzon, Gustavo Javier
Piegaia, Ricardo Nestor
Sacerdoti, Sabrina
Reisin, Hernan Diego
Alconada Verzini, María Josefina
Alonso, Franciasco
Anduaga, Xabier Sebastian
Arduh, Francisco Anuar
Dova, Maria Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernan Pablo
Zhukov, K.
Zibell, A.
Zieminska, D.
Zimine, N. I.
Zimmermann, C.
Zimmermann, R.
Zimmermann, S.
Zimmermann, S.
Ziolkowski, M.
Zobernig, G.
Zoccoli, A.
Nedden, M. zur
Zurzolo, G.
Zutshi, V.
Zwalinski, L.
The ATLAS Collaboration
Resumen
A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λb0→J/ψ(μ+μ-)Λ0(pπ-) is reported. The analysis is based on 1400 Λb0 and Λ¯b0 baryons selected in 4.6 fb-1 of proton-proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the Λb0 and Λ¯b0 samples under the assumption of CP conservation, the value of αb is measured to be 0.30±0.16(stat)±0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory.