Determination of the normalised invariant mass distribution of $\mathrm{t\bar{t}}+$jet and extraction of the top quark mass

A measurement of the top quark mass from top quark pair ($\mathrm{t\bar{t}}$) events produced in association with additional hard jets is performed in pp collisions at $\sqrt{s}=8$ TeV with the CMS detector using data recorded in 2012, corresponding to an integrated luminosity of 19.7 fb$^{-1}$. The mass is extracted from the normalised invariant mass distribution of the $\mathrm{t\bar{t}}\text{+jet}$ system at reconstruction level as well as from the related normalised differential cross section. Both measurements are performed in the dileptonic decay channels ($\mathrm{e^+e^-}$, $\mu^+\mu^-$ and $\mathrm{e^{\pm}}\mu^{\pm}$) of the $\mathrm{t\bar{t}}$ quark pairs.