What is G for a muon?

Muon g-2 (pronounced “gee minus two”) is a particle physics experiment at Fermilab to measure the anomalous magnetic dipole moment of a muon to a precision of 0.14 ppm, which will be a sensitive test of the Standard Model. It might also provide evidence of the existence of entirely new particles.

What does the Muon g-2 do?

Muon g-2 (pronounced gee minus two) uses Fermilab’s powerful accelerators to explore the interactions of short-lived particles known as muons with a strong magnetic field in “empty” space. Scientists know that even in a vacuum, space is never empty.

What is g2 anomaly?

The story begins in 2001, when physicists performing an experiment in Brookhaven National Lab, New York, found that fundamental particles called muons weren’t behaving the way they were supposed to in the presence of a magnetic field. This was called the g-2 anomaly (after a number called the gyromagnetic factor).

How Do You measure G-2?

How do we measure g-2? A beam of muons with aligned spins is directed into a storage ring that has a very precisely known magnetic field. As the beam goes around this storage ring, the muons’ spins wobble, or precess. Scientists measure the rate that they precess very precisely.

What is the Muon g-2 discovery?

The Muon g-2 experiment hosted at Fermi National Accelerator Laboratory announced April 7 that they had measured a particle called a muon behaving slightly differently than predicted in their giant accelerator. It was the first unexpected news in particle physics in years.

What is magnetic moment of muon?

It is defined to be aμ = (g–2)/2, where g is the gyromagnetic ratio of the muon – the number of Bohr magnetons, e/2m, which make up the muon’s magnetic moment.

How does the G-2 experiment work?

The Muon g-2 experiment sends a beam of muons into a ring of magnets, where they circulate thousands of times at nearly the speed of light. Detectors lining the ring allow scientists to determine how fast the muons are precessing.

What happens at Fermilab?

We work on the world’s most advanced particle accelerators and dig down to the smallest building blocks of matter. We also probe the farthest reaches of the universe, seeking out the nature of dark matter and dark energy.

What is g2 correlation?

Introduction. The second order correlation function g(2) is one of the most important characteristic function for a light source [1]. It is the major feature to distinguish non-classical, anti-bunching light sources from the classical thermal ones.

Where was the Muon g-2 experiment — that has everyone so excited — conducted?

Who owns Fermilab?

the Fermi Research Alliance
Since 2007, Fermilab has been operated by the Fermi Research Alliance, a joint venture of the University of Chicago, and the Universities Research Association (URA). Fermilab is a part of the Illinois Technology and Research Corridor.

What is correlation of light?

First order correlation is actually the amplitude-amplitude correlation and the second order correlation is the intensity-intensity correlation. It is also used to differentiate between states of light that require a quantum mechanical description and those for which classical fields are sufficient.

Why is g-factor 2?

It became apparent from experiments that the electron’s internal g-factor (as opposed to it’s orbital g-factor) needed to be 2 instead of 1. i.e. the electron’s Gyromagnetic ratio = , Where takes the value of 2 rather than 1.

Why the Muon g-2 results are so exciting?

This result is so exciting because it deviates so clearly from the Standard Model prediction of the muon’s g-factor; there has to be some new particle or interaction that affects muons.”