New horizon in particle physics: first observation of CP violation in baryon decays
Fuente:
arXiv
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912459814600704 |
|---|---|
| author | Yu, Fu-Sheng Lü, Cai-Dian |
| author_facet | Yu, Fu-Sheng Lü, Cai-Dian |
| contents | Recently, the LHCb Collaboration achieved the observation of CP violation (CPV) in baryon decays through the process of $Λ_b^0\to pK^-π^+π^-$, reporting an asymmetry of $(2.45\pm0.46\pm0.10)\%$ with a significance of 5.2$σ$. This marks a breakthrough and a milestone in particle physics, six decades after the first observation of CPV in mesons. It will be helpful to understand the matter-antimatter asymmetry in the universe. In addition to the global CPV, local CPV is also observed by LHCb in the low mass region of $m_{pπ^+π^-}<2.7$GeV as $(5.4\pm0.9\pm0.1)\%$ with a significance of 6.0$σ$. Intriguingly, this measurement aligns well with a theoretical prediction of $(5.6-5.9)\%$ based on a CPV dynamics using the data of $Nπ\to pπ^+π^-$ scatterings. Since baryons contain one more quark than mesons, the dynamics of baryon decays are significantly different from those of mesons. Therefore, the first observation of baryon CPV by LHCb opens a new horizon in the studies of dynamics of the strong interaction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_15008 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | New horizon in particle physics: first observation of CP violation in baryon decays Yu, Fu-Sheng Lü, Cai-Dian High Energy Physics - Phenomenology High Energy Physics - Experiment Recently, the LHCb Collaboration achieved the observation of CP violation (CPV) in baryon decays through the process of $Λ_b^0\to pK^-π^+π^-$, reporting an asymmetry of $(2.45\pm0.46\pm0.10)\%$ with a significance of 5.2$σ$. This marks a breakthrough and a milestone in particle physics, six decades after the first observation of CPV in mesons. It will be helpful to understand the matter-antimatter asymmetry in the universe. In addition to the global CPV, local CPV is also observed by LHCb in the low mass region of $m_{pπ^+π^-}<2.7$GeV as $(5.4\pm0.9\pm0.1)\%$ with a significance of 6.0$σ$. Intriguingly, this measurement aligns well with a theoretical prediction of $(5.6-5.9)\%$ based on a CPV dynamics using the data of $Nπ\to pπ^+π^-$ scatterings. Since baryons contain one more quark than mesons, the dynamics of baryon decays are significantly different from those of mesons. Therefore, the first observation of baryon CPV by LHCb opens a new horizon in the studies of dynamics of the strong interaction. |
| title | New horizon in particle physics: first observation of CP violation in baryon decays |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2504.15008 |