Are the new particles heavy or light in b → s E_miss?

2024/12/26 by Hu, Quan-Yi
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2412.19084

Abstract

In this work, we study the B⁺→ K⁺ E_miss, B⁰→ K^*0 E_miss, and Λ_b⁰→ Λ⁰ E_miss decays under three different new physics hypotheses: the heavy new particles, the light neutral vector particles, and the axion-like particles. We find that all three hypotheses can resolve the Belle-II excess, and they can be clearly distinguished by the longitudinal polarization fraction of K^*. Furthermore, we discover that the longitudinal polarization fraction of Λ can be used to distinguish the chirality of the effective operators.

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