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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2401.15734 |
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| _version_ | 1866909085236985856 |
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| author | London, David |
| author_facet | London, David |
| contents | In this talk, I describe a global fit to $B \to PP$ decays, where $B = \{B^0, B^+, B_s^0\}$ and the pseudoscalar $P = \{π, K\}$, under the assumption of flavour SU(3) symmetry [SU(3)$_F$]. It is found that the individual fits to $ΔS=0$ or $ΔS=1$ decays are good, but the combined fit is very poor: there is a $3.6σ$ disagreement with the standard model. (This is quite a bit larger than the anomaly in $b \to s \ell^+ \ell^-$ transitions.) This discrepancy can be removed by adding SU(3)$_F$-breaking effects, but 1000\% SU(3)$_F$ breaking is required, considerably more than the $\sim 20\%$ breaking of $f_K/f_π- 1$. These results are rigorous, group-theoretically -- no theoretical assumptions have been made. But when one adds a single assumption motivated by QCD factorization, the discrepancy grows to $4.4σ$. These are the anomalies in hadronic $B$ decays. Although one cannot yet claim that new physics is present, it is clear that something very unexpected is going on. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_15734 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anomalies in Hadronic $B$ Decays London, David High Energy Physics - Phenomenology In this talk, I describe a global fit to $B \to PP$ decays, where $B = \{B^0, B^+, B_s^0\}$ and the pseudoscalar $P = \{π, K\}$, under the assumption of flavour SU(3) symmetry [SU(3)$_F$]. It is found that the individual fits to $ΔS=0$ or $ΔS=1$ decays are good, but the combined fit is very poor: there is a $3.6σ$ disagreement with the standard model. (This is quite a bit larger than the anomaly in $b \to s \ell^+ \ell^-$ transitions.) This discrepancy can be removed by adding SU(3)$_F$-breaking effects, but 1000\% SU(3)$_F$ breaking is required, considerably more than the $\sim 20\%$ breaking of $f_K/f_π- 1$. These results are rigorous, group-theoretically -- no theoretical assumptions have been made. But when one adds a single assumption motivated by QCD factorization, the discrepancy grows to $4.4σ$. These are the anomalies in hadronic $B$ decays. Although one cannot yet claim that new physics is present, it is clear that something very unexpected is going on. |
| title | Anomalies in Hadronic $B$ Decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2401.15734 |