CMS: Recent Results on Heavy Flavor Production with the CMS Experiment

Abstract

The present report summarizes three recent CMS results on Heavy Flavor production, fully or partially exploiting the data collected at LHC with proton-proton collisions at the center-of-mass energy $\sqrt{s}= 13$ TeV. Firstly, a measurement of the prompt open-charm differential production cross section is performed on $29$ nb$^{-1}$ of data collected in 2016. The CMS results are compared to a few theoretical calculations and to previous measurements by other experiments at the LHC in different kinematic ranges. Secondly, the observation of two $B_c$ excited states by CMS, $B_c(2S)^+$ and $B_c^{*}(2S)^+$, has been recently followed by the measurement of their relative production cross sections using $143$ fb$^{-1}$ of data collected during the whole LHC Run-II (2015-2018). The dependence of the cross sections on the transverse momentum and the rapidity of the ground state $B_c$ is studied along with the dipion invariant mass distribution. Finally, a fiducial cross-section for $\Upsilon(1S)$ pair production is measured using $35.9$ fb$^{-1}$ of data collected during 2016. The contribution of double-parton scattering (DPS) to the total inclusive $\Upsilon(1S)$ pair production cross section is also measured for the first time in the same fiducial region.