He announced the finding in a talk at Fermilab on Feb. With the new measurement of the W boson mass, the new upper limit of the Higgs has dropped to 145 GeV, "so it is now more likely that the Higgs boson is light," Kotwal said. The new upper limit is 145 GeV.When Kotwal presented his last measurement of the W boson's mass in 2007, it put the upper limit of the Higgs boson mass at 161 GeV. "This result significantly improves the world knowledge of the Higgs boson," Kotwal said, explaining that the precise measurement of the mass of the W boson makes a precise prediction for the mass of the Higgs.Based on the new W boson mass, Kotwal's team has calculated that the Higgs boson mass is roughly 90 GeV, or billion electron volts, with a precision of 30 percent."The best way to think of this is to present the upper limit on the Higgs boson mass with 95 percent probability, which means that there is only one 1 in 20 chance of the Higgs being heavier than this upper limit," Kotwal said. 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.According to the results of the experiment, the W boson's new mass was measured at 80387 million electron volts divided by the speed of light squared, give or take 19 MeV (80387 +- 19 MeV/c^2), with a precision of 0.02 percent. Image courtesy of symmetry magazine/plush toys by artist Julie Peasley/photo by Robert Tilden. The W boson is squeezing in on what the mass of the Higgs can be.
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