Sunday 02 February 2025
A team of physicists has made a significant breakthrough in their quest to detect dark matter, a mysterious substance that makes up about 27% of the universe but has yet to be observed directly.
The researchers used a computer simulation called the Phased-Striped Hadron Spectrometer (PHSD) to study the decay of hypothetical particles known as dark photons. These particles are thought to interact with normal matter only weakly, making them difficult to detect.
The team found that the PHSD model accurately predicted the production of dilepton pairs – particles consisting of two electrons or positrons – in collisions between protons and heavier ions such as lead. The results were compared to data from the STAR experiment at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory, which detected dileptons produced in heavy-ion collisions.
The PHSD model also predicted the production of dark photons decaying into dilepton pairs, with the team extracting an upper limit on the kinetic mixing parameter epsilon2. This parameter determines how easily dark photons interact with normal matter.
The results are consistent with existing experimental constraints and suggest that dark photons could make up a small fraction of the total dilepton yield in heavy-ion collisions. The discovery would be significant as it would provide evidence for the existence of dark matter, which is still purely theoretical at this point.
To achieve their goal, the researchers used the PHSD model to simulate heavy-ion collisions and calculate the production rates of dileptons and dark photons. They then compared these predictions with data from the STAR experiment to extract an upper limit on epsilon2.
The team’s findings are not only important for understanding the properties of dark matter but also have implications for particle physics more broadly. The study demonstrates the potential of computer simulations to predict and interpret experimental results, allowing scientists to refine their theories and make new predictions about the behavior of fundamental particles.
In addition, the discovery could pave the way for future experiments aimed at detecting dark matter directly. The search for dark matter is an active area of research, with scientists using a range of methods to detect its presence in the universe.
Cite this article: “Physicists Edge Closer to Detecting Dark Matter”, The Science Archive, 2025.
Dark Matter, Phased-Striped Hadron Spectrometer, Phsd, Dark Photons, Dilepton Pairs, Relativistic Heavy Ion Collider, Rhic, Brookhaven National Laboratory, Star Experiment, Particle Physics
