Abstract
Recent results of the ATLAS experiment at LHC on decay properties of b-hadrons are reviewed. The time-dependent CP asymmetry parameters have been measured in Bs0→J/ψϕ decays using flavour tagging. The parity-violating decay asymmetry parameter αb and the helicity amplitudes have been measured for the decay Λb0→J/ψΛ0. The branching fraction B(B+→χc1K+) has been measured with χc1 reconstruction in the decay χc1→J/ψγ. An excited Bc± state has been observed through its decays to the ground Bc± state and two oppositely charged pions. The mass and decay of this state are consistent with expectations for the second S -wave state of the Bc± meson, Bc±(2S).
Highlights
The time evolution of Bs meson mixing is characterized by the mass difference Δms of the heavy (BH) and light (BL) mass eigenstates the CP-violating mixing phase φs the width difference of ΔΓs = ΔΓL - ΔΓH Interference between the Bs decays amplitudes to the CP eigenstates J/ψφ or via mixing gives rise to a measurable CP violating phase φs SM: New Physics could modify φs and ΔΓs / Δms If new particles contributes to box diagrams
Q = 288.3 ± 3.5 ± 4.1 MeV M = 6842 ± 4 ± 5 MeV. Both mass value and decay mode agree with expectations for Bc±(2S)
PRD 87 (2013) 032002 18 χb(3P) observation in χb(3P) → Υ(1/2 S) γ
Summary
Parity violation from Λb → J/ψ Λ0 (PRD 89 (2014) 092009) Branching fraction of B+ → χс1 K+ (arXiv:1404.7035, to JHEP) Observ. Of excited Bc (→ Bcπ+π-) (arXiv:1407.1032, to PRL) Summary & Prospects Back-up : ATLAS trigger for the flavour physics Measurements of ΔΓs and φs from Bs → J/ψφ
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
