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Propensity fermions are a theoretical concept in particle physics, introduced to address certain anomalies and inconsistencies in the Standard Model of particle physics. The term "propensity fermion" refers to a hypothetical fermion that interacts with the Higgs field in a way that is different from the known fermions. Unlike the Standard Model fermions, which have a definite chirality (either left-handed or right-handed), propensity fermions are proposed to have a propensity for chirality, meaning they can exist in a superposition of both left-handed and right-handed states.

The concept of propensity fermions was first proposed to explain the observed parity violation in weak interactions. In the Standard Model, parity violation is attributed to the weak interaction, which only affects left-handed fermions. However, the introduction of propensity fermions allows for the possibility of parity violation in interactions involving both left-handed and right-handed fermions, potentially providing a more unified description of parity violation.

Propensity fermions also have implications for the generation of fermion masses. In the Standard Model, fermion masses are generated through the Yukawa interaction with the Higgs field. Propensity fermions, with their propensity for chirality, could potentially lead to new mechanisms for mass generation, further enriching the particle physics landscape.

Despite their theoretical appeal, propensity fermions remain a speculative concept. No experimental evidence has been found to support their existence, and they are not included in the Standard Model. However, they continue to be a topic of interest in theoretical physics, as they offer a potential path to resolving certain anomalies and inconsistencies in our understanding of the fundamental forces and particles.