Measurement of the CP-violating phase ϕ<sub>s</sub> and the B<sup>0</sup><sub>s</sub> meson decay width difference with B<sup>0</sup><sub>s</sub>→ J/ψϕ decays in ATLAS
A measurement of the B<sup>0</sup><sub>s</sub> decay parameters in the B<sup>0</sup><sub>s</sub>→ J/ψϕ channel using an integrated luminosity of 14.3 fb<sup>-1</sup> collected by the ATLAS detector from 8 TeV pp collisions at the LHC is pre...
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| Autores principales: | , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2016
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/87011 |
| Aporte de: |
| Sumario: | A measurement of the B<sup>0</sup><sub>s</sub> decay parameters in the B<sup>0</sup><sub>s</sub>→ J/ψϕ channel using an integrated luminosity of 14.3 fb<sup>-1</sup> collected by the ATLAS detector from 8 TeV pp collisions at the LHC is presented. The measured parameters include the CP-violating phase ϕ<sub>s</sub>, the decay width Γ<sub>s</sub> and the width difference between the mass eigenstates ΔΓ<sub>s</sub>. The values measured for the physical parameters are statistically combined with those from 4.9 fb<sup>-1</sup> of 7 TeV data, leading to the following:
Φ<sub>s</sub> = -0.090 ± 0.078 (stat.) ± (syst.) rad
ΔΓ<sub>s</sub> = 0.085 ± 0.011 (stat.) ± 0.007 (syst.) ps<sup>-1</sup>
Γ<sub>s</sub> = 0.675 ± 0.003 (stat.) ± 0.03 (syst.) ps<sup>-1</sup>
In the analysis the parameter ΔΓ<sub>s</sub> is constrained to be positive. Results for ϕ<sub>s</sub> and ΔΓ<sub>s</sub> are also presented as 68% and 95% likelihood contours in the ϕ<sub>s</sub>-ΔΓ<sub>s</sub> plane. Also measured in this decay channel are the transversity amplitudes and corresponding strong phases. All measurements are in agreement with the Standard Model predictions. |
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