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We study the cross correlation of damped Ly$\alpha$ systems (DLAs) and theirbackground quasars, using the most updated DLA catalog and the Planck 2018 CMBlensing convergence field. Our measurement suggests that the DLA bias $b_{\rmDLA}$ is smaller than $3.1$, corresponding to $\log(M/M_\odot h^{-1})\leq 12.3$at a confidence of $90\%$. These constraints are broadly consistent with Alonsoet al. (2018) and previous measurements by cross-correlation between DLAs andthe Ly$\alpha$ forest (e.g. Font-Ribera et al. 2012; Perez-Rafols et al. 2018).Further, our results demonstrate the potential of obtaining a more precisemeasurement of the halo mass of high-redshift sources using next generation CMBexperiments with a higher angular resolution. The python-based codes and dataproducts of our analysis are available athttps://github.com/LittleLin1999/CMB-lensingxDLA.

Constraining the Halo Mass of Damped Ly$\alpha$ Absorption Systems (DLAs) at $z=2-3.5$ using the Quasar-CMB Lensing Cross-correlation