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STELLAR CHEMISTRY
Fresh Antimatter Study Will Help Search for Dark Matter
by Staff Writers
Geneva, Switzerland (SPX) May 29, 2020

A view of the underground ALICE detector used in the study of the antideuteron (Image: CERN)

The ALICE collaboration has presented new results on the production rates of antideuterons based on data collected at the highest collision energy delivered so far at the Large Hadron Collider.

The antideuteron is composed of an antiproton and an antineutron. The new measurements are important because the presence of antideuterons in space is a promising indirect signature of dark matter candidates. The results mark a step forward in the search for dark matter.

Recent astrophysical and cosmological results point towards dark matter being the dominant form of matter in the universe, accounting for approximately 85% of all matter. The nature of dark matter remains a great mystery, and cracking its secrets would open a new door for physics.

Detecting antideuterons in space could be an indirect signature of dark matter, since they could be produced during the annihilation or decay of neutralinos or sneutrinos, which are hypothetical dark matter particles.

Various experiments are on the hunt for antideuterons in the universe, including the AMS detector on the International Space Station. However, before inferring the existence of dark matter from the detection of these nuclei, scientists must account for both their rates of production by other sources (namely, collisions between cosmic rays and nuclei in the interstellar medium) and the rates of their annihilation caused by encountering matter on their journey.

In order to assert that the detected antideuteron is related to the presence of dark matter, the production and annihilation rates must be well understood.

By colliding protons in the LHC, ALICE scientists mimicked antideuteron production through cosmic ray collisions, and could thus measure the production rate associated with this phenomenon. These measurements provide a fundamental basis for modelling antideuteron production processes in space.

By comparing the amount of antideuterons detected with that of their matter counterparts (deuterons, which do not annihilate in the detector), they were able to determine, for the first time, the annihilation probability of low-energy antideuterons.

These measurements will contribute to future antideuteron studies in the Earth's vicinity, and help physicists determine whether they are signatures of the presence of dark matter particles, or if on the contrary they are manifestations of known phenomena.

In the future, these types of studies at ALICE could be extended to heavier antinuclei. "The LHC and the ALICE experiment represent a unique facility to study antimatter nuclei," says ALICE Spokesperson Luciano Musa. "This research will continue to provide a crucial reference for the interpretation of future astrophysical dark matter searches."

Research Report: "Measurement of the Low-Energy Antideuteron Inelastic Cross Section" and "(Anti-)Deuteron Production in pp Collisions at Sqrt(s) = 13 TeV"


Related Links
2020 Large Hadron Collider Physics conference
Stellar Chemistry, The Universe And All Within It


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STELLAR CHEMISTRY
Cosmic bursts unveil Universe's missing matter
Perth, Australia (SPX) May 28, 2020
The researchers have now found all of the missing 'normal' matter in the vast space between stars and galaxies, as detailed in the journal Nature. Lead author Associate Professor Jean-Pierre Macquart, from the Curtin University node of the International Centre for Radio Astronomy Research (ICRAR), said astronomers have been searching for the missing matter for almost thirty years. "We know from measurements of the Big Bang how much matter there was in the beginning of the Universe," he said. ... read more

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