The CDF value has a precision of 0.01 percent and is in agreement with many W boson mass measurements. Scientists of the Collider Detector at Fermilab collaboration have achieved the world’s most precise measurement. The mass of a W boson is about 80 times the mass of a proton, or approximately 80,000 MeV/c2. It is our most robust measurement to date, and the discrepancy between the measured and expected values persists." It took us many years to go through all the details and the needed checks. "These are challenging, complicated measurements, and they have achieved ever more precision. "Many collider experiments have produced measurements of the W boson mass over the last 40 years," said CDF co-spokesperson Giorgio Chiarelli, Italian National Institute for Nuclear Physics (INFN-Pisa). It is based on the observation of 4.2 million W boson candidates, about four times the number used in the analysis the collaboration published in 2012. This result uses the entire dataset collected from the Tevatron collider at Fermilab. The central value and uncertainty of their latest mass measurement is 80,433 +/- 9 MeV/c 2. CDF researchers have worked on achieving increasingly more precise measurements of the W boson mass for more than 20 years. The mass of a W boson is about 80 times the mass of a proton, or approximately 80,000 MeV/c 2. When we uncovered the value, it was a surprise." Using high-energy particle collisions produced by the Tevatron collider at Fermilab, the CDF collaboration collected huge amounts of data containing W bosons from 1985 to 2011.ĬDF physicist Chris Hays of the University of Oxford said, "The CDF measurement was performed over the course of many years, with the measured value hidden from the analyzers until the procedures were fully scrutinized.
It is responsible for the nuclear processes that make the sun shine and particles decay. The W boson is a messenger particle of the weak nuclear force. "While this is an intriguing result, the measurement needs to be confirmed by another experiment before it can be interpreted fully," said Fermilab Deputy Director Joe Lykken. CDF scientists are studying the properties of the W boson using data they collected at the Tevatron Collider at Fermilab. The W boson is the messenger particle of the weak nuclear force. Future measurements will be needed to shed more light on the result. The new value is in agreement with many previous W boson mass measurements, but there are also some disagreements. If confirmed, this measurement suggests the potential need for improvements to the standard model calculation or extensions to the model. When we finally unveiled the result, we found that it differed from the standard model prediction." "We took into account our improved understanding of our particle detector as well as advances in the theoretical and experimental understanding of the W boson's interactions with other particles. Kotwal of Duke University, who led this analysis and is one of the 400 scientists in the CDF collaboration.
"The number of improvements and extra checking that went into our result is enormous," said Ashutosh V.
The result: The new mass value shows tension with the value scientists obtain using experimental and theoretical inputs in the context of the standard model. The new precision measurement, published in the journal Science, allows scientists to test the standard model of particle physics, the theoretical framework that describes nature at its most fundamental level.
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