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Measurement of the CP-violating phase $\phi_s$ and the $B^0_s$ meson decay width difference with $B^0_s \to J/\psi\phi$ decays in ATLAS

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Detalhes bibliográficos
Resumo:A measurement of the B$_{s}^{0}$ decay parameters in the B$_{s}^{0}$  → J/ψϕ channel using an integrated luminosity of 14.3 fb$^{−1}$ collected by the ATLAS detector from 8 TeV pp collisions at the LHC is presented. The measured parameters include the CP -violating phase ϕ$_{s}$ , the decay width Γ$_{s}$ and the width difference between the mass eigenstates ΔΓ$_{s}$ . The values measured for the physical parameters are statistically combined with those from 4.9 fb$^{−1}$ of 7 TeV data, leading to the following: $ \begin{array}{l}{\phi}_s=-0.090\pm 0.078\left(\mathrm{stat}.\right)\pm 0.041\left(\mathrm{syst}.\right)\mathrm{rad}\\ {}\varDelta {\varGamma}_s=0.085\pm 0.011\left(\mathrm{stat}.\right)\pm 0.007\left(\mathrm{syst}.\right){\mathrm{ps}}^{-1}\\ {}{\varGamma}_s=0.675\pm 0.003\left(\mathrm{stat}.\right)\pm 0.003\left(\mathrm{syst}.\right){\mathrm{ps}}^{-1}.\end{array} $
Autores principais:ATLAS collaboration (2857 authors)
Outros Autores:Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Cantrill, Robert; Carvalho, João; Castro, Nuno Filipe; Conde Muiño, Patricia; Da Cunha Sargedas De Sousa, Mario Jose; Fiolhais, Miguel; Galhardo, Bruno; Gomes, Agostinho; Gonçalo, Ricardo; Jorge, Pedro; Lopes, Lourenco; Machado Miguens, Joana; Maio, Amélia; Maneira, José; Onofre, António; Palma, Alberto; Pedro, Rute; Pina, João Antonio; Pinto, Belmiro; Santos, Helena; Saraiva, João; Silva, José; Tavares Delgado, Ademar; Veloso, Filipe; Wolters, Helmut
Ano:2016
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Laboratório de Instrumentação e Física Experimental de Partículas
Idioma:inglês
Origem:Laboratório de Instrumentação e Física Experimental de Partículas
Descrição
Resumo:A measurement of the B$_{s}^{0}$ decay parameters in the B$_{s}^{0}$  → J/ψϕ channel using an integrated luminosity of 14.3 fb$^{−1}$ collected by the ATLAS detector from 8 TeV pp collisions at the LHC is presented. The measured parameters include the CP -violating phase ϕ$_{s}$ , the decay width Γ$_{s}$ and the width difference between the mass eigenstates ΔΓ$_{s}$ . The values measured for the physical parameters are statistically combined with those from 4.9 fb$^{−1}$ of 7 TeV data, leading to the following: $ \begin{array}{l}{\phi}_s=-0.090\pm 0.078\left(\mathrm{stat}.\right)\pm 0.041\left(\mathrm{syst}.\right)\mathrm{rad}\\ {}\varDelta {\varGamma}_s=0.085\pm 0.011\left(\mathrm{stat}.\right)\pm 0.007\left(\mathrm{syst}.\right){\mathrm{ps}}^{-1}\\ {}{\varGamma}_s=0.675\pm 0.003\left(\mathrm{stat}.\right)\pm 0.003\left(\mathrm{syst}.\right){\mathrm{ps}}^{-1}.\end{array} $