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The reason why Beyond the Standard Model (BSM) particles typically do not appear at tree level (directly in the initial or final states of a scattering process) and instead manifest primarily in loops (appearing virtually in intermediate states) is closely tied to the structure of the Standard Model (SM) and the nature of quantum field…

In the realm of theoretical physics, the concept of parallel universes and multiverse theories pushes the boundaries of our understanding of the cosmos. What if our universe is just one among countless others, each with its own set of physical laws and realities? Let’s delve into this fascinating topic and explore the intriguing possibilities of…