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Measurement of the relative width difference of the B0-B¯0 system with the ATLAS detector

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  • ATLAS Collaboration
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Article number81
<mark>Journal publication date</mark>14/06/2016
<mark>Journal</mark>Journal of High Energy Physics
Issue number6
Number of pages39
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

This paper presents the measurement of the relative width difference ΔΓd/Γd of the B0-B¯0 system using the data collected by the ATLAS experiment at the LHC in pp collisions at √s=7TeV and √=8 TeV and corresponding to an integrated luminosity of 25.2 fb−1. The value of ΔΓd/Γd is obtained by comparing the decay-time distributions of B0 → J/ψKS and B0 → J/ψK*0(892) decays. The result is ΔΓd/Γd = (−0.1±1.1 (stat.)± 0.9 (syst.)) × 10−2. Currently, this is the most precise single measurement of ΔΓd/Γd. It agrees with the Standard Model prediction and the measurements by other experiments.