Flavour tagged time dependent angular analysis of the $B_s\to J/\psi \varphi$ decay and extraction of $\Delta \Gamma$ and the weak phase ${\varphi }_s$ in ATLAS

Abstract

A measurement of the $B_s\to J/\psi \varphi$ decay parameters, updated to include flavour tagging is reported using $4.9f{b}^{-1}$ of integrated luminosity collected by the ATLAS detector from $\sqrt{s}=7$TeV $pp$ collisions recorded in 2011 at the LHC. The values measured for the physical parameters are: \begin{eqnarray*} ϕ_s & = & 0.12 \pm 0.25(stat.)\pm 0.05(syst.)rad \\ ΔΓ& = & 0.053 \pm 0.021(stat.) 0.010(syst.)ps^{-1} \\ Γ_s & = & 0.677 \pm 0.007 (stat.)\pm 0.004 (syst.)ps^{-1}\\ |A_{\parallel}(0)|^2 & = & 0.220 \pm 0.008 (stat.)\pm 0.009(syst.)\\ |A_{0}(0)|^2 & = & 0.529 \pm 0.006 (stat.)\pm 0.012(syst.)\\ δ_\perp & = & 3.89 \pm 0.47(stat.) \pm 0.11(syst.)rad \end{eqnarray*} where the parameter $\Delta \Gamma$ is constrained to be positive. The $S$-wave contribution was measured and found to be compatible with zero. Results for ${\varphi }_s$ and $\Delta \Gamma$ are also presented as $68\%$ and $95\%$ likelihood contours, which show agreement with the Standard Model expectations.

arXiv comment26 pages plus author list + cover pages (54 pages total), 9 figures, 7 tables, submitted to PRD, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-01/

References in corpus (15)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The ATLAS Simulation Infrastructure
• Theoretical update of Bs-Bs-bar mixing
• Observation of Bs-Bsbar Oscillations
• Measurement of the differential cross-sections of inclusive, prompt and non-prompt J/psi production in proton-proton collisions at sqrt(s) = 7 TeV
• Measurement of CP violation and the B_s^0 meson decay width difference with B_s^0\to J/ψK^+ K^- and B_s^0\to J/ψπ^+π^- decays
• Measurement of the CP-violating phase phi_s in the decay Bs->J/psi phi
• Measurement of the CP-violating phase ${\varphi }_s^{J/\psi \varphi }$ using the flavor-tagged decay $B_s^0\to J/\psi \varphi$ in 8 fb${}^{-1}$ of $p \barp$ collisions
• Constraints on new physics from the quark mixing unitarity triangle
• Measurement of the Bottom-Strange Meson Mixing Phase in the Full CDF Data Set
• Determination of the sign of the decay width difference in the B_s system
• Measurement of the B^0_s - \bar{B}^0_s oscillation frequency Delta m_s in B^0_s -> D_s^-(3) pi decays
• Extracting CKM Phases and $B_s-{\bar{B}}_s$ Mixing Parameters from Angular Distributions of Non-Leptonic B Decays
• Time-dependent angular analysis of the decay Bs -> J/psi phi and extraction of Delta Gamma_s and the CP-violating weak phase phi_s by ATLAS

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• Measurement of the $CP$-violating phase ${\varphi }_{\mathrm{s}}$ in the B${}_{\mathrm{s}}^0$ $\to$ J$/\psi \varphi$(1020) $\to$ ${\mu }^{+}{\mu }^{-}$K${}^{+}$K${}^{-}$ channel in proton-proton collisions at $\sqrt{s}=$ 13 TeV
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• Prospect for measurement of the CP-violating phase ${\varphi }_s$ in the $B_s\to J/\psi \varphi$ channel at a future Z factory
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• First evidence for mixing-induced $CP$ violation in B${}_{\mathrm{s}}^0$ $\to$ J/$\psi \varphi$(1020) decays in pp collisions at $\sqrt{s}=$ 13 TeV
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• CKM studies from b physics at hadron machines
• Search for $CP$ violation in $B_s^0$ mixing at LHCb
• Flavour tagging techniques for CPV studies in the $B_s$ system with ATLAS
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