Nuclear Modification Factor RpA of b jets in pPb collisions

We present a measurement of the nuclear modification factor $R_{\mathrm{pA}}^{\mathrm{PYTHIA}}$ of b jets in proton-lead collisions from CMS. Jets from b-quark fragmentations are found by exploiting the long lifetime of the b-quark through tagging methods using distributions of the secondary vertex displacement. From these, b-jet cross-sections are calculated and compared to a pp cross-section obtained from a PYTHIA simulation. The $R_{\mathrm{pA}}^{\mathrm{PYTHIA}}$ is consistent with unity within systematic uncertainties and may show slight enhancement due to cold nuclear matter effects for a wide range in pseudorapidity. These effects are qualitatively consistent with the observed value for the inclusive jet $R_{\mathrm{pA}}$. We use 35 nb$^{-1}$ of proton-lead data collected during the 2013 heavy-ion run at the LHC.