Speaker
Yevgeny Kats
(Weizmann Institute)
Description
Measurements of polarizations of quarks produced in new physics processes could provide crucial information about the structure of the new physics. The $b$ and $c$-quark polarizations are largely preserved in the lightest baryons they hadronize into, $\Lambda_b$ and $\Lambda_c$, respectively. We show how ATLAS and CMS can measure the $b$-quark polarization using semileptonic $\Lambda_b$ decays, and the $c$-quark polarization using $\Lambda_c^+ \to p K^- \pi^+$ decays. For calibrating both measurements we suggest to use $t\bar t$ samples in which these polarizations can be measured with precisions of order 10% using 100 fb$^{-1}$ of data in Run 2 of the LHC.
additional information
Based on arXiv:1505.02771.
Author
Yevgeny Kats
(Weizmann Institute)
