Currently, the Standard Model of particle physics only accounts for 17 fundamental particles, including the Higgs Boson. These particles are organized into 3 families or generations. So far, there is no evidence or theoretical basis for the existence of other fundamental particles beyond what is already known.
Yes, there are ongoing experiments at various particle accelerators, such as the Large Hadron Collider, to search for evidence of new particles that may exist beyond the Standard Model. These experiments involve colliding particles at high energies and studying the resulting interactions to uncover any new particles.
Some theories, such as String Theory, suggest that there may be additional spatial dimensions beyond the three that we experience in our everyday lives. In these theories, it is possible that there could be other types of particles or particle clusters that exist in these additional dimensions, but this has not been confirmed by experimental evidence.
The discovery of new particles or particle clusters can greatly advance our understanding of the universe and the fundamental forces that govern it. It can also help to fill in gaps in the Standard Model and potentially lead to new technologies and applications.
Scientists use a variety of methods and techniques, including particle colliders, detectors, and mathematical models, to search for new particles. These methods allow them to study the properties and interactions of particles and make predictions about their behavior. If experimental evidence supports these predictions, it can indicate the existence of new particles, including Boson particle clusters.