Researchers have made a groundbreaking discovery. They’ve found particle pairs emerging from the vacuum during intense proton collisions. This adds to our understanding of how mass can come from seemingly empty space.
The findings challenge traditional views about what makes up ordinary matter. Instead of being just a passive void, space itself appears to actively contribute to mass.
In the midst of a collision, pairs of lambda particles were created. They showed a unique spin pattern consistent with the quarks that can form from vacuum energy. Zhoudunming Tu from Brookhaven National Laboratory demonstrated that this alignment stayed constant even after the particles decayed. This persistence raises intriguing questions about how this order translates into measurable mass.
Interestingly, the lambda and anti-lambda particle pairs exhibited an 18% relative polarization, which was statistically significant. This indicates that strange quarks likely emerged from the vacuum already aligned in the same direction. Other types of particle pairs didn’t show this same consistent pattern, making the lambda pairs stand out.
Lambda particles were particularly useful in this research because their short-lived decays preserve information about the spin of their constituent strange quarks. When each lambda particle decayed in a fraction of a second, the resulting daughter particles provided clues about the original spin direction. This allowed the researchers to reconstruct the alignment of the particles, offering a snapshot of their origin.
Modern physics now views the vacuum as more than empty space. It is filled with energy fields that create particle pairs briefly. In quantum chromodynamics (QCD), quarks are so tightly bound that they rarely exist independently. Under high-energy collisions, these fleeting pairs can transform into real particles.
This new research pushes our understanding further. Protons and neutrons have more mass than what their quarks alone would suggest. Much of their weight arises from the energy of the strong force and the conditions of vacuum surrounding the quarks. While this finding doesn’t provide a complete solution, it gives physicists a new perspective and experimental method to explore this complex question.
Distance matters in particle physics. The shared alignment of particles tends to weaken as they separate, losing the quantum order. This phenomenon, known as decoherence, suggests that the original alignment was real and not a product of later measurement.
Researchers also had to rule out other explanations for their observations, as particle collisions can create misleading patterns. They compared their findings against established data and found no correlations in other particle types.
The STAR detector, weighing about 1,200 tons, is designed specifically for tracking the debris from high-energy collisions at Brookhaven. It plays a unique role, as it’s the only collider capable of studying polarized proton beams for spin research. This capability offers insights not just into particle creation but also into how spin information is conserved through confinement.
While this discovery is exciting, it’s also just the beginning. Some scientists believe the findings could lead to new experiments that investigate different conditions in the vacuum. These follow-up studies may reveal whether the patterns observed are isolated incidents or part of a broader framework.
Empty space is now seen less as a silent canvas and more as an influential player in building the mass of visible matter. This marks a significant step in understanding how vacuum dynamics contribute to the universe’s structure. The research is published in Nature.
For more detailed information, you can check the original study here.
