Focus of the March paper is mostly orthogonal to the BICEP2-Planck dispute
You are often being told that polar bears love the chilling weather and thick ice but POLARBEAR is a CMB experiment located in a desert in Chile (although the altitude is over 5 kilometers). Californian cosmologists from Berkeley and San Diego are the main members of the collaboration.
A few hours ago, it announced a "breakthrough" that was reported in the media:
POLARBEAR detects B-modes in the cosmic microwave background: Mapping cosmic structure, finding neutrino masses (Science Daily, news)A problem with the hype is that the paper producing the story is nothing else than the March 2014 preprint that many of us have seen a long time ago. But let me discuss this as if the story were really new because no blog post has been dedicated specifically to POLARBEAR yet.
A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Sub-degree Scales with POLARBEAR (Astrophysical Journal, arXiv)
They describe themselves as the most accurate ones, and so on.