The concept of tachyons, hypothetical particles that travel faster than the speed of light, is still a topic of scientific debate. Tachyons, if they exist, would have imaginary mass and several unusual properties. However, it is important to note that there is currently no experimental evidence supporting the existence of tachyons.
In the context of your question, if we were to consider the existence of tachyons, it would be speculative to suggest that photons are the decayed products of tachyons. Tachyons, if they exist, would not be expected to decay into photons or any other known particles according to our current understanding of particle physics.
Photons, on the other hand, are elementary particles that are the fundamental carriers of electromagnetic radiation. They have zero rest mass and travel at the speed of light in a vacuum. Photons play a crucial role in various phenomena, including light, electromagnetic waves, and the interaction between light and matter.
The origin and behavior of photons are well-studied within the framework of quantum field theory and the Standard Model of particle physics. While tachyons remain speculative, photons are well-established entities with their own distinct properties and behaviors.
It's worth noting that scientific understanding is based on empirical evidence and rigorous investigation. Hypothetical concepts like tachyons are considered within the scientific community, but they require experimental verification to establish their existence and properties.