Physics | Probing the fragile stability of leptin flavors

Area | Probing the fragile stability of leptin flavors


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W A measurement of the ratio of the decay charge of a boson right into a muon versus its decay charge into an electron. The brand new ATLAS result’s proven as an open blue circle within the final row. Earlier measurements are proven above utilizing strong symbols, and particle knowledge group averages of all earlier outcomes are proven utilizing black diamonds. Credit score: ATLAS/CERN

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W A measurement of the ratio of the decay charge of a boson right into a muon versus its decay charge into an electron. The brand new ATLAS result’s proven as an open blue circle within the final row. Earlier measurements are proven above utilizing strong symbols, and particle knowledge group averages of all earlier outcomes are proven utilizing black diamonds. Credit score: ATLAS/CERN

In a chat on the ongoing Rencontres de Moriond convention, the ATLAS collaboration offered its newest take a look at of a key precept of the Commonplace Mannequin of particle physics known as lepton taste universality. The accuracy of the outcomes is the perfect ever obtained from an experiment in W boson decay and is increased than the present experimental common.

Most simple particles might be divided into teams or households with related properties. For instance, the lepton household consists of the electron, which types the negatively charged cloud of particles surrounding the nucleus in each atom, the muon, a heavy particle present in cosmic rays, and the tau lepton, which There may be solely a fair heavier short-lived particle. seen in high-energy particle interactions.

So far as physicists know, the one distinction between these particles is their mass, as produced by the interplay of their completely different forces with the basic discipline related to the Higgs boson. Specifically, a notable characteristic of the Commonplace Mannequin is that every lepton kind, or “taste”, is equally more likely to work together with a W boson, the weak pressure electrically charged service that’s the attribute of nature. is without doubt one of the 4 elementary forces. This precept is named lepton taste universality.

Excessive-precision checks of the universality of the lepton taste, similar to these obtained by evaluating the decay charges of W bosons to an electron and an electron neutrino, to a muon and a muon neutrino, or to a tau lepton and a tau neutrino, So they’re delicate. Investigating Physics Past the Commonplace Mannequin. Certainly, if the lepton taste is common, these decay charges must be equal (inside mass-independent corrections).

This may be examined by measuring the ratio of the decay charges of W bosons in several lepton flavors. One of many challenges related to such measurements on the Giant Hadron Collider (LHC) is the gathering of a pure (“impartial”) pattern of W bosons.

In a paper revealed by Nature Physics In 2021, ATLAS reported the world’s most correct measurement of the ratio of the decay charge of the W boson to that of the tau lepton and its charge to that of a muon, indicating that collision occasions that A pair of prime quarks is produced in and a clear pattern of W bosons.

In a current paper launch on arXiv The preprint server, ATLAS, launched a brand new measurement, this time specializing in the ratio of the decay charge of a W boson right into a muon versus its decay charge into an electron. Whereas the mixture of all earlier measurements exhibits that this ratio is inside about 0.6% of unity, per the equal decay charge, there may be nonetheless room for enchancment.

The brand new ATLAS result’s primarily based on a research of its full knowledge set from the second run of the LHC, which was collected between 2015 and 2018. The evaluation checked out greater than 100 million top-quark-pair collision occasions. The up quark is immediately transformed right into a w boson and a down quark, so this pattern supplies 100 million pairs of w bosons.

Extra info:
Exact take a look at of the universality of the lepton taste in w-bosons decays into muons and electrons in PP collisions at s√=13 TeV with the ATLAS collaboration, ATLAS detector. arXiv (2024). DOI: 10.48550/arxiv.2403.02133

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