JOINT PARTICLE SEMINAR


NOTE SPECIAL TIME

Date: Tuesday, 22 March 2005   Time: 3:00 p.m.

Place: 4135 Frederick Reines Hall

Speaker: Chris Hays, Duke

Title: Toward the World's Most Precise W Mass Measurement with CDF

Abstract: When combined with other electroweak parameters, the W mass provides the most accurate prediction of the mass of the Higgs boson, the last remaining unobserved standard model particle. The measurement of the W mass is therefore a high priority at the Fermilab Tevatron, where it was measured in Run 1 to a precision of better than a part in 1000. The CDF collaboration has analyzed the first 200/pb of Run 2 data and determined the corresponding measurement uncertainty to be 76 MeV, which is below the CDF combined Run 1 uncertainty. With the expected collection of an order of magnitude more data over the next two years, the measurement will achieve better precision than the current world uncertainty of 34 MeV. When combined with the measurement of the top mass, the full set of Run 2 data will indirectly determine the Higgs mass with an accuracy of 25%.

Host: A. Lankford