The possibility that the mass of a kind of elementary particle 'W boson' exceeds the speculation so far, is it necessary to modify the standard model?



Experiments using

the Tevatron accelerator at the Fermi National Accelerator Laboratory in the United States have shown that the W bosons of weak bosons , which are elementary particles that mediate weak interactions , may be heavier than previously predicted theory. was discovered.

CDF sets W mass against the Standard Model – CERN Courier
https://cerncourier.com/a/cdf-sets-w-mass-against-the-standard-model/



New ATLAS result weighs in on the W boson | ATLAS Experiment at CERN

https://atlas.cern/Updates/Briefing/2023-W-Mass-Measurement



Particle's surprise mass threatens to upend the standard model

https://doi.org/10.1038/d41586-022-01014-5

Weak bosons are elementary particles that mediate weak interactions in particle physics. Weak bosons were predicted to exist theoretically in 1968, and their existence was confirmed in 1983 by the European Organization for Nuclear Research (CERN).

There are two types of weak bosons, W bosons and Z bosons, and the mass of W bosons has been measured by CERN in 2017 as 80.370 ± 0.019 giga electron volts .

However, in April 2022, a research team led by Ashutosh Kotwal of Duke University used the Tevatron accelerator at the Fermi National Accelerator Laboratory to measure the ` `CDF collision experiment''. I'm guessing 80.434±0.009 giga-electronvolts.

The measurement results by Kotwal et al. are 0.064 giga electron volts larger than the mass of the W boson predicted so far, and the error is 0.009%, which is the highest accuracy ever. As a result, it has been pointed out that it may be necessary to revise the theory called the ' standard model ,' which is the pillar of current elementary particle physics and can explain the characteristics of elementary particles, such as their types, masses, and properties. .



Regarding the results of this measurement, David Toback of the research team said, ``It is up to experts in elementary particle theory and other experiments to prove that this measurement is correct.'' 'It is also possible that the discrepancy between the masses of conventional W bosons and our measurements is due to interactions with certain new elementary and

subatomic particles . Future experiments will explore these new elements.' It is very likely that particles and subatomic particles will be found.'

On the other hand, CERN announced the measurement results in March 2023, and in the measurement using the `` ATLAS detector '', one of the experimental devices of the Large Hadron Collider , the mass of the W boson is 80.360 ± 0.016 giga electron volts. , which is about 0.1 gigaelectronvolt lower than the measurement made in 2017, but is consistent with the mass of the W boson expected in the Standard Model.



However, it does not mean which of the measurement results of Mr. Kotowal et al. , one user replied , 'The Standard Model is not fully understood and is still being actively studied, so it is subject to change.' It's akin to asking, 'Can I run this RISC -V program on a RISC-V processor?' RISC-V processors and the Standard Model also differ in extensions they add to the basic definition,' he adds. .

Related Posts:

in Science, Posted by log1r_ut