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Higgs Boson Gets New Mass Limit

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.

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Name Symbol Antiparticle Charge (e) Spin Mass (GeV/c) Interaction mediated Existence
Photon Self 0 1 0 Electromagnetism Confirmed
W boson W- W+ -1 1 80.4 Weak interaction Confirmed
Z boson Z Self 0 1 91.2 Weak interaction Confirmed
Gluon g Self 0 1 0 Strong interaction Confirmed
Higgs boson H Self? 0 0 >112 None Unconfirmed
Graviton G Self 0 2 0 Gravitation Unconfirmed


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