Speaker
Dr
Jongkuk Kim
(Kangwon National University)
Description
In 2023, the Belle II Collaboration announced the observation of the
B→K+νν decay channel for the first time. This decay channel provides a clean signal with high precision in theoretical calculations. However, we encounter a 2.8σ deviation from the Standard Model prediction. To resolve this excess, we study a scalar dark matter model with local discrete Z_3 symmetry. Assuming dark U(1)X≡U(1){Lμ-Lτ} symmetry, this U(1){Lμ-Lτ} symmetry is spontaneously broken into local discrete Z_3 by nonzero vacuum expectation value of dark Higgs boson. Considering a dark Higgs mass is 2 GeV, we can explain the recent Br(B→K+νν) excess reported from the Belle II Collaboration and relic abundance at the same time.
| Primary Abstract Topic | Theory: WIMPs |
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Authors
Dr
Jongkuk Kim
(Kangwon National University)
Prof.
Pyungwon Ko
(KIAS (Korea Institute for Advanced Study))