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Measurement of the parity-violating asymmetry parameterαband the helicity amplitudes for the decayΛb0→J/ψΛ0with the ATLAS detector

Aad, G.
•
Abajyan, T.
•
Abbott, B.
altro
GIORDANI, Mario
2014
  • journal article

Periodico
PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY
Abstract
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.
DOI
10.1103/PhysRevD.89.092009
WOS
WOS:000336651300001
Archivio
http://hdl.handle.net/11390/1109872
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84902007565
Diritti
metadata only access
Web of Science© citazioni
16
Data di acquisizione
Mar 27, 2024
Visualizzazioni
1
Data di acquisizione
Apr 19, 2024
Vedi dettagli
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