The new particle is so fundamental that it's almost unbelievable.

Scientists have discovered semi-Dirac fermions, quasiparticles that behave as massless in one direction and massive in another, inside a crystal of ZrSiS. This discovery, achieved using advanced magneto-optical spectroscopy, could revolutionize technologies like batteries and sensors while opening new avenues for quantum physics research. (Artist’s concept.) Credit: SciTechDaily.com (ScitechDaily, “Totally Unexpected” – Scientists Stumble Upon a Bizarre Particle That Defies the Rules)

16 years ago researchers predicted a particle that has mass when it travels in another direction. And it has no mass. While it travels in another direction. The particle has mass and no mass at the same time. So particles are massive and massive at the same time. 

The name semi-Dirac particle means that the Dirac equation can introduce that particle when it travels to another direction and the Dirac equation cannot introduce that particle when it travels into another direction. 

The new semi-Dirac particle is one of the most fundamental findings in physics. The new particle has mass when it travels in one direction. But it has no mass when it travels in the opposite direction. The semi-massless particle can answer the question of why photons have no mass. The half-massless particle is also interesting because it can introduce how fields and other wave movements turn into one particle. The term "Dirac-particle" means particles that spin 1/2. And the Dirac equation can introduce them mathematically.  

"Landau levels spectroscopy sheds light on semi-Dirac fermions at the crossing point of two nodal lines within a semi-metal material (Left: Fermi surface of a nodal-line crossing model, Right: Band structure of material). Credit: Yinming Shao/Penn State" ((ScitechDaily, “Totally Unexpected” – Scientists Stumble Upon a Bizarre Particle That Defies the Rules)

The semi-Dirac particle means that the Dirac equation can introduce it when it travels in another direction. But it cannot introduce a particle when it travels in another direction. Dirac equation cannot introduce particles that spin is something else than 1/2 and that don't have mass. The photon spin is 1. That means the photon rotates a full round around its axle. That spin can explain why a photon has no mass. That spin makes it impossible for photons they touch the quantum field and interact with it. Or the photon cannot bound that quantum field inside it. 

The ring-shaped structure in the photon aims energy field over it and that keeps the energy balance in the photon. Because a photon gets as much energy as it delivers it cannot turn older. There is something that denies the semi-Dirac particle mass when it travels to another side. There is the possibility. That kind of ring-shaped quantum field makes the particle massless when it travels in another direction. The interesting thing is the question about the mass of that new particle when it's in a stable position. 

The new semi-Dirac particle causes ideas that maybe the Dark Matter particles the mysterious and hypothetical Axions are similar parts to this semi-Dirac particle. But can the particle have two masses? That means the particle can have mass when it travels in the universe. But the particle can have a different mass. While it travels in another direction. The reason for that can be that the quantum field packs to the other side of the particle. The particle that has mass while it travels in another direction and has no mass while it travels in another direction is the thing. That is a miracle. 

https://scitechdaily.com/totally-unexpected-scientists-stumble-upon-a-bizarre-particle-that-defies-the-rules/

https://en.wikipedia.org/wiki/Dirac_equation

https://en.wikipedia.org/wiki/Landau_levels