They found that normal matter (made of familiar particles like protons and neutrons, collectively called baryons) makes up about 4 to 5 percent of the cosmos’ total energy density. (The ...

With the Cosmic Origins Spectrograph on Hubble, we are conducting UV spectroscopic studies of missing baryons in the intergalactic medium, quasar ionizing spectra, mass estimates of super-massive ...

It remains to be seen in other meson decays and in decays of other types of particles, such as three-quark particles called baryons. In two new articles posted to the arXiv preprint server ...