Home LATEST NEWS The W boson shakes the Standard Model of particle physics

The W boson shakes the Standard Model of particle physics


There are hints that some parts are missing from the Standard Model, and we bring a new one, very interesting and quite importanttold AFP its main author, Professor Ashutosh Kowtal, a physicist at American Duke University.

This theory takes into account all the measurements made in the field of elementary particle physics, that is to say the world of the infinitely small, whose elements constitute the atoms and the forces that govern them.

The Standard Model, finalized in the second half of the 20th century, makes it possible to make predictions with fantastic accuracy on the behavior of these particles, explains physicist Harry Cliff, at the University of Cambridge.

Like that of the W boson, a particle conveying in particular a so-called weak interaction between other particles of matter. It is the basis of radioactivity and, beyond that, of nuclear fusion reactions, like those that drive the Sun.

All these particles and forces find themselves linked in a kind of equilibrium. For example, the mass of the W boson is constrained by that of the Higgs boson.

The standard model predicts an equilibrium, and the experimental result presented to us contradicts this prediction.notes for AFP the physicist and research director at the CNRS Jan Stark.

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This card castle wavers with the study’s announcement that the mass of the W boson is stronger than expected.

The feat of the CDF collaboration, a group of some 400 scientists led by Professor Kowtal, is to have measured this mass, at 80,433 mega-electron-volts, with unprecedented precision (0.01%), two times larger than the best existing one.

It is the result of ten years of analysis on a sample of 4 million particles, produced in the Tevatron, a particle accelerator at Fermilab in the United States, now closed.

This accelerator, like the CERN LHC in Europe [qui a permis d’identifier le boson de Higgs]causes particles to smash together at phenomenal speeds, revealing by breaking the elements that compose them.

It is now up to another team, on another instrument, to confirm the result of this study to prove it.

Because, as Jan Stark reminds us, extraordinary claims require extraordinary evidence.

A major challenge, given the extreme precision of the measurement, which cannot be a matter of statistical chance.

As a result, it’s either a major finding or a problem in the data analysiscomments Jan Stark, who predicts fairly lively discussions in the years to come.

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Questioning the existence of new particles?

The announcement of the CDF collaboration is the latest in cracks that have been appearing for several years in the Standard Model, with precise measurements that contradict the model’s predictionsnote the physicists and authors of another article in Science.

If confirmed, this discovery could betray the existence new interactions or new particleswhich today’s experiments are not yet able to reveal.

If physicists are looking for lice in the head of the Standard Model, it is because the latter struggles, among other things, to explain a big thing in the infinitely bigdark matter, according to Jan Stark, who directs the aptly named Laboratoire des 2 infinis (L2IT), at Paul Sabatier University in Toulouse.

Several observations, such as the velocity of galaxies in galactic clusters, or the abnormal speed of revolution of certain stars, have forced astrophysicists to theorize the existence of a hypothetical black matter driving these phenomena.

But nothing in the Standard Model explains which particle would compose this black matter.

We follow the path, without neglecting any track. So we will come to understandwants to believe Professor Kotwal.

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