Measurement of the relative width difference of the $B^0$-${\bar{B}}^0$ system with the ATLAS detector

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 $pp$ 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 $B^0\to J/\psi K^{\ast 0}(892)$ decays. The result is $ΔΓ_d / Γ_d = (-0.1 \pm 1.1~\mbox{(stat.)} \pm 0.9~\mbox{(syst.)}) \times 10^{-2}$. 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.

arXiv comment20 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/

References in corpus (19)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• Big-Bang Nucleosynthesis
• The ATLAS Simulation Infrastructure
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Performance of the ATLAS Trigger System in 2015
• Performance of the ATLAS Trigger System in 2010
• In Pursuit of New Physics with B_s Decays
• Production and Hadronization of Heavy Quarks
• Performance of the ATLAS muon trigger in pp collisions at $\sqrt{s}=8$ TeV
• On new physics in $\Delta {\Gamma }_d$
• Study of CP-violating charge asymmetries of single muons and like-sign dimuons in p pbar collisions
• Measurements of the $B^{+}$, $B^0$, $B_s^0$ meson and ${\Lambda }_b^0$ baryon lifetimes
• Limits on the Decay-Rate Difference of Neutral-B Mesons and on CP, T, and CPT Violation in B0-antiB0 Oscillations
• Measurement of the B0bar-B0 and Bsbar-Bs production asymmetries in pp collisions at sqrt(s)=7 TeV
• Search for Time-Dependent CPT Violation in Hadronic and Semileptonic B Decays
• Measurement of the effective B_s^0 -> J/ψ K_S^0 lifetime
• Bottom Production Asymmetries at the LHC

Cited by in corpus (8)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Boosted Self-interacting Dark Matter in a Multi-component Dark Matter Model
• Search for supersymmetry in pp collisions at sqrt(s) = 13 TeV in the single-lepton final state using the sum of masses of large-radius jets
• On the Feasibility of Bell Inequality Violation at ATLAS Experiment with Flavor Entanglement of $B^0{\bar{B}}^0$ Pairs from $pp$ Collisions
• Theory Motivation: What measurements are needed?
• Summary of CKM 2016 Working Group 4 : mixing and mixing-related $CP$ violation in the $B$ system