An international team of scientists has released a new report offering insights into the behavior of the heaviest particles in the universe under extreme conditions, similar to those present shortly after the Big Bang. The research, published in Physics Reports, is authored by physicists Juan M. Torres-Rincón,from the Institute of Cosmos Sciences at the University of Barcelona (ICCUB),Santosh K. Das, from the Indian institute of Technology Goa (India), and Ralf Rapp, from Texas A&M University (United States).

The complete review examines how heavy quarks (charm and bottom hadrons) interact within a hot, dense environment known as hadronic matter. This environment is formed during the final stage of high-energy collisions of atomic nuclei, such as those occurring at the Large Hadron Collider (LHC) and the Relativistic Heavy Ion Collider (RHIC). The study emphasizes the importance of including hadronic interactions in simulations to accurately interpret data from thes large-scale experiments.

The research expands our understanding of matter’s behavior under extreme conditions and contributes to solving mysteries about the universe’s origins.

Simulating the Early Universe

When atomic nuclei collide at near-light speeds,they produce temperatures exceeding those at the center of the Sun by over 1,000 times. these collisions briefly create a quark-gluon plasma (QGP), a soup of basic particles that existed microseconds after the Big Bang.As this plasma cools, it transforms into hadronic matter, composed of particles like protons, neutrons, baryons, and mesons.

“To really understand what we see in the experiments, it is crucial to observe how the heavy particles move and interact also during the later stages of these nuclear collisions,”

The study focuses on the behavior of heavy-flavor hadrons (particles containing charmed or background quarks, such as D and B mesons) during this transition and the subsequent hadronic phase expansion.

Heavy Particles as Probes

Heavy quarks act as tiny sensors. Their large mass causes them to be produced shortly after the initial nuclear collision and move more slowly,leading to different interactions with the surrounding matter. Understanding their scattering and spread is crucial for understanding the properties of the medium they traverse.

Researchers analyzed various theoretical models and experimental data to understand how heavy hadrons, like D and B mesons, interact with light particles in the hadronic phase. They also investigated how these interactions affect observable quantities like particle flux and momentum loss.