Seminar detail: Missing final state puzzle in the monopole-fermion scattering

Date&Time	Tue Dec 05 2023 (17:00 - 18:00)
Speaker	Ryutaro Matsudo
Affiliation	National Taiwan Univ.
Title	Missing final state puzzle in the monopole-fermion scattering
Abstract	It has been known that when a charged fermion scatters off a monopole, the fermion in the s-wave component must flip its chirality, i.e., fermion number violation must happen. This fact has led to a puzzle; if there are two or more flavors of massless fermions, any superposition of the fermion states cannot be the final state of the s-wave scattering as it is forbidden by conservation of the electric and flavor charges. The unitary evolution of the state vector, on the other hand, requires some interpretation of the final states. We solve the puzzle by finding new particle excitations in the monopole background, where multi-fermion operators exhibit condensation. The particles are described as excitations of closed-string configurations of the condensates. This talk is based on the paper arXiv:2103.13639.
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