Speaker
Description
Measurements of heavy quark hadronization fractions, or the probabilities $f_q$ that a bottom quark forms one of the weakly decaying B hadrons, are essential for precision measurements of B branching fractions made at hadron colliders and potentially limit searches for new physics in $B_s$ decays. Although once thought to be universal, recent measurements have suggested an environmental and $p_T$ dependence of the ratio $f_s/f_u$ which is examined in detail by new measurements made by the CMS experiment using $62\;fb^{-1}$ of pp collision data at the LHC. Large samples of J/ψ decays have been collected for this purpose using dedicated triggers, which also allow for the reconstruction of exotic charm states decaying to J/ψ J/ψ. While the nature of these states remains unclear, CMS confirms the observation of the X(6900) state, and observes two new states denoted X(6600) and X(7300) with significance of 6.5 and 4.1 standard deviations, respectively.
