Updated constraints on dark matter cross section and mass are presented combining CMB power spectrum measurements from Planck , WMAP9 , ACT , and SPT as well as several low-redshift datasets ( BAO , HST , supernovae ) .
For the CMB datasets , we combine WMAP9 temperature and polarization data for l \leq 431 with Planck temperature data for 432 \leq l \leq 2500 , ACT and SPT data for l > 2500 , and Planck CMB four-point lensing measurements .
We allow for redshift-dependent energy deposition from dark matter annihilation by using a ‘ universal ’ energy absorption curve .
We also include an updated treatment of the excitation , heating , and ionization energy fractions , and provide updated deposition efficiency factors ( f _ { \text { eff } } ) for 41 different dark matter models .
Assuming perfect energy deposition ( f _ { \text { eff } } = 1 ) and a thermal cross section , dark matter masses below 26 GeV are excluded at the 2 \sigma level .
Assuming a more generic efficiency of f _ { \text { eff } } = 0.2 , thermal dark matter masses below 5 GeV are disfavored at the 2 \sigma level .
These limits are a factor of \sim 2 improvement over those from WMAP9 data alone .
These current constraints probe , but do not exclude , dark matter as an explanation for reported anomalous indirect detection observations from AMS-02/PAMELA and the Fermi Gamma-ray Inner Galaxy data .
They also probe relevant models that would explain anomalous direct detection events from CDMS , CRESST , CoGeNT , and DAMA , as originating from a generic thermal WIMP .
Projected constraints from the full Planck release should improve the current limits by another factor of \sim 2 , but will not definitely probe these signals .
The proposed CMB Stage IV experiment will more decisively explore the relevant regions and improve upon the Planck constraints by another factor of \sim 2 .