Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ0b →J/ψΛ0 with the ATLAS detector
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| Publication date | 2014 |
| Journal | Physical Review D. Particles, Fields, Gravitation, and Cosmology |
| Article number | 092009 |
| Volume | Issue number | 89 | 9 |
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| Abstract | 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 Λ¯0b 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 Λ0b and Λ¯0b 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. |
| Document type | Article |
| Note | ATLAS Collaboration |
| Language | English |
| Published at | https://doi.org/10.1103/PhysRevD.89.092009 |
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