Abstract
Selected recent B-physics results published by the ATLAS experiment at the LHC are presented. The Λ0b parity-violating decay asymmetry parameter, σb, is measured to be 0.30 ± 0.16(stat) ± 0.06(syst). A new excited state of the B±c meson is observed with a mass 6842 ± 4(stat) ± 5(syst) MeV, consistent with expectations for the second S-wave state of the B±c meson, B±c(2S).
Highlights
Results by the ATLAS Collaboration on the measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ0b → J/ψΛ0 [1] and on the observation of an excited Bc± meson state [2] are reported.2
1 2 particle decay can be extracted from the angular distribution dN d cos θ
The Λ0b → J/ψΛ0 decay can be described by four helicity amplitudes A(λΛ0, λJ/ψ): a+ = |a+|eiρ+ ≡ A(1/2, 0), a− = |a−|eiρ− ≡ A(−1/2, 0), b+ = |b+|eiω+ ≡ A(−1/2, −1), b− = |b−|eiω− ≡ A(1/2, 1), where λΛ0 and λJ/ψ are the helicities of Λ0 and J/ψ
Summary
1. Introduction Results by the ATLAS Collaboration on the measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ0b → J/ψΛ0 [1] and on the observation of an excited Bc± meson state [2] are reported. Due to the symmetries of the initial state and the ATLAS detector [5], P (pT , η) = −P (pT , −η), the average polarisation is zero, and a full angular analysis is required to extract α. The analysis extracts αb and the helicity amplitudes from the measured averages The distribution of F2 in the signal and background regions is shown in figure 2.
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