A joint explanation of the $B\to πK$ puzzle and the $B \to K ν\barν$ excess
Fuente:
arXiv
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915012862279680 |
|---|---|
| author | Altmannshofer, Wolfgang Roy, Shibasis |
| author_facet | Altmannshofer, Wolfgang Roy, Shibasis |
| contents | In light of the recent branching fraction measurement of the $B^{+}\to K^{+} ν\barν$ decay by Belle II and its poor agreement with the SM expectation, we analyze the effects of an axion-like particle (ALP) in $B$ meson decays. We assume a long-lived ALP with a mass of the order of the pion mass that decays to two photons. We focus on a scenario where the ALP decay length is of the order of meters such that the ALP has a non-negligible probability to decay outside the detector volume of Belle II, mimicking the $B^{+}\to K^{+} ν\barν$ signal. Remarkably, such an arrangement is also relevant for the long-standing $B\to πK$ puzzle by noting that the measured $B^{0}\to π^{0}K^{0}$ and $B^{+}\to π^{0}K^{+}$ decays could have a $B^{0}\to a K^{0}$ and $B^{+}\to a K^{+}$ component, respectively. We also argue based on our results that the required ALP-photon effective coupling belongs to a region of parameter space that can be extensively probed in future beam dump experiments like SHiP. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_06592 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A joint explanation of the $B\to πK$ puzzle and the $B \to K ν\barν$ excess Altmannshofer, Wolfgang Roy, Shibasis High Energy Physics - Phenomenology High Energy Physics - Experiment In light of the recent branching fraction measurement of the $B^{+}\to K^{+} ν\barν$ decay by Belle II and its poor agreement with the SM expectation, we analyze the effects of an axion-like particle (ALP) in $B$ meson decays. We assume a long-lived ALP with a mass of the order of the pion mass that decays to two photons. We focus on a scenario where the ALP decay length is of the order of meters such that the ALP has a non-negligible probability to decay outside the detector volume of Belle II, mimicking the $B^{+}\to K^{+} ν\barν$ signal. Remarkably, such an arrangement is also relevant for the long-standing $B\to πK$ puzzle by noting that the measured $B^{0}\to π^{0}K^{0}$ and $B^{+}\to π^{0}K^{+}$ decays could have a $B^{0}\to a K^{0}$ and $B^{+}\to a K^{+}$ component, respectively. We also argue based on our results that the required ALP-photon effective coupling belongs to a region of parameter space that can be extensively probed in future beam dump experiments like SHiP. |
| title | A joint explanation of the $B\to πK$ puzzle and the $B \to K ν\barν$ excess |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2411.06592 |