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.

26 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 (2)

• PYTHIA 6.4 Physics and Manual
• Constraints on new physics from the quark mixing unitarity triangle

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• CKM studies from b physics at hadron machines
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• Search for $CP$ violation in $B_s^0$ mixing at LHCb