New, more precise measurements of a particle called the W boson are again suggesting that physicists' prized Higgs boson is lighter than previously predicted. Using detectors at the Fermi National Accelerator Laboratory in Illinois, Duke physicist Ashutosh Kotwal and his collaborators have made the world's most precise mass measurement of the W boson, a key quantity in the Standard Model -- the theory physicists use to explain the dynamics of subatomic particles. Read more