Measurement of the relative width difference of the <i>B</i><SUP>0</SUP>-(<i>B</i>)over-bar<SUP>0</SUP> system with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2846 more authors) (2016) Measurement of the relative width difference of the <i>B</i><SUP>0</SUP>-(<i>B</i>)over-bar<SUP>0</SUP> system with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 06 (6). 081-.

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Abstract

This paper presents the measurement of the relative width difference $\Delta \Gamma_d / \Gamma_d$ of the $B^0$-$\bar B^0$ system using the data collected by the ATLAS experiment at the LHC in $p p$ collisions at $\sqrt{s} = 7$ TeV and $\sqrt{s} = 8$ TeV and corresponding to an integrated luminosity of 25.2 fb$^{-1}$. The value of $\Delta \Gamma_d / \Gamma_d$ is obtained by comparing the decay-time distributions of $B^0 \to J/\psi K_S$ and $B^0 \to J/\psi K^{*0}(892)$ decays. The result is $\Delta \Gamma_d / \Gamma_d = (-0.1 \pm 1.1~\mbox{(stat.)} \pm 0.9~\mbox{(syst.)}) \times 10^{-2}$. Currently, this is the most precise single measurement of $\Delta \Gamma_d / \Gamma_d$. It agrees with the Standard Model prediction and the measurements by other experiments.

Item Type: Article
Additional Information: 20 pages plus author list + cover page (38 pages total), 5 figures, 2 tables, submitted to Journal of High Energy Physics, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2015-01/
Uncontrolled Keywords: B physics, Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 23 Feb 2017 09:17
Last Modified: 18 Oct 2023 01:33
DOI: 10.1007/JHEP06(2016)081
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3005945