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Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ<sup>0</sup>b →j /ψ Λ<sup>0</sup> with the ATLAS detector

By María Josefina Alconada Verzini, Francisco Alonso, Xabier Sebastián Anduaga, María Teresa Dova, Fernando Gabriel Monticelli and Martín Fernando Tripiana


A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λ0b→J/ψ(μ+μ-)Λ0(pπ-) is reported. The analysis is based on 1400 Λ0b and Λ0¯b 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 Λ0¯b 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.La lista completa de autores que integran el documento puede consultarse en el archivo.Instituto de Física La Plat

Topics: Física, Ciencias Exactas, Parity-violating asymmetry, ATLAS detector, Quantum chromodynamics
Year: 2019
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