【直播】【李政道研究所】High-precision measurement of the W boson mass...

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报告题目

High-precision measurement of the W boson mass with the CDF II detector

报告人（单位）

Ashutosh V. Kotwal

报告时间

2022年4月12日（周二）10:00

主办方

上海交通大学李政道研究所、物理与天文学院

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报告人介绍

Ashutosh V. Kotwal is the Fritz London Distinguished Professor of Physics at Duke University. He has got the PhD degree in 1995 from Harvard University. In 1999, he joined the Trinity College of Arts & Sciences of Duke University. Prof. Ashutosh Kotwal’s research focuses on the physics of fundamental particles and forces at high energies. He leads the worldwide effort to measure very precisely the mass of the W boson, which is sensitive to the quantum mechanical effects of new particles or forces. In particular it is directly connected to the properties of the Higgs boson. If the properties of the Higgs differ from the current Standard Model theory, the mass of the W boson will also differ from its predicted value.  For more information, please visit: https://scholars.duke.edu/person/ashutosh.kotwal.

报告摘要

The mass of the W boson,a mediator of the weak force between elementary particles, is tightly constrained by the symmetries of the standard model of particle physics. The Higgs boson was the last missing component of the model. After observation of the Higgs boson, a measurement of the W boson mass provides a stringent test of the model. We measure the W boson mass, M_w, using data corresponding to 8.8 inverse femtobarns of integrated luminosity collected in proton-antiproton collisions at a 1.96 tera-electron volt center-of-mass energy with the CDF II detector at the Fermilab Tevatron collider. A sample of approximately 4 million W boson candidates is used to obtain M_w = 80,433.5 ± 6.4_stat ± 6.9_syst = 80,433.5 ± 9.4 Mev/c², the precision of which exceeds that of all previous measurements combined (stat, statistical uncertainty; syst, systematic uncertainty; MeV, mega-electron volts; c, speed of light in a vacuum). This measurement is in significant tension with the standard model expectation.

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