ALPHA Collaboration Breakthrough

Scientists from the international ALPHA Collaboration just published a paper that has been heralded as a "breakthrough in antimatter research."

Published in the journal, Nature, the result of research focus on the properties of antihydrogen.

Through their work, the team has improved our measurements of the charge of this material by a factor of about 20. This allows us to better understand the nature of anitmatter, and the more accurate measurements could ultimately help us answer some of the most fundamental questions plaguing modern physics.

Case in point, one of the most longstanding questions in the study of antimatter (and physics in general) is based on the assumption that the Big Bang created matter and antimatter in equal amounts. If this is indeed the case, and it seems that it is, then why is there currently so much more matter than antimatter in the universe? Where did all the antimatter go?”

Understanding Charges

According to our understanding of the rules of physics, every particle of matter should have an oppositely charged antiparticle with equal mass. But it seems that the "rules" may be a little bit different than we anticipated.

According to Dr. Andrea Capra, “we take the charge of matter and antimatter for granted, however, you cannot analyze data or make an experiment assuming it's true." To that end, if we want to understand what caused the loss of antimatter in our universe, then we need to have a firm understanding of the charge of antimatter.

So, what do the new findings reveal?

They don't explain why there is so much missing antimatter, but they do help us better understand what didn't cause the scales to tip in favor of matter..

"That means the electrical charge of antihydrogen - the antimatter analogue of hydrogen - can be ruled out as the answer to the antimatter question," explains York University Professor Scott Menary, an ALPHA member.

A view from the Experimental Zone floor of the ALPHA-2 Cryostat . Image Credit: Robert Thompson, ALPHA-2 member, University of Calgary
Piece of the Puzzle

Although we don't have a final answer, the results do add a piece to the overall puzzle. Moreover, this was just the first experiment that was conducted using the upgraded “ALPHA-2” system, whose largest component (the cooling cryostat) lent itself to the creation of the stable cryogenic environment that allowed for the higher trapping rate of the technology—and this first experiment was remarkably successful, giving us precisely the information that we hoped to gain.

The success of this experiment now prompts the ALPHA Collaboration team to begin working on answer other antimatter questions.

"We will now look at the other pieces of the puzzle, such as the colour of the light emitted by antihydrogen, and test whether hydrogen and antihydrogen emit light in the same way," says Capra. "We are also working on measuring the gravitational acceleration of antihydrogen and determining whether matter and antimatter have the same gravitational behaviour. The next several years are going to be very exciting."

And hopefully, they will give us ideas regarding the final solution to the missing antimatter.

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