Measurement of the $𝛬^0_b$ lifetime and mass in the ATLAS experiment

Le résumé fourni par la source

A measurement of the $𝛬^0_b$ lifetime and mass in the decay channel $𝛬^0_𝑏→𝐽/𝜓⁡(𝜇^+⁢𝜇^−)⁢𝛬^0⁡(𝑝⁢𝜋^−)$ is presented. The analysis uses a signal sample of about 2200 $𝛬^0_𝑏$ and $\overline{𝛬}^0_𝑏$ decays that are reconstructed in $4.9 fb^{−1} of ATLAS$ $𝑝⁢𝑝$ collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the $𝛬^0_𝑏$ lifetime and mass. They are measured to be $𝜏_{𝛬𝑏}=1.449±0.036⁢(stat)±0.017⁢(syst) ps$ and $𝑚_{𝛬𝑏}=5619.7±0.7⁢(stat)±1.1⁢(syst) MeV$.

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