Branching fractions and CP asymmetries in charm meson decays
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arXiv
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| Natura: | Preprint |
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2025
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| _version_ | 1866910900233961472 |
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| author | Nierste, Ulrich |
| author_facet | Nierste, Ulrich |
| contents | I present a consistent way to include $η$-$η^\prime$ mixing in global analyses of two-body decays of heavy hadrons employing the approximate flavour-SU(3) symmetry of QCD. The framework is applied to $D\to P η^\prime$ decays, where $P$ denotes a pseudoscalar meson. The result shows that flavour-SU(3) symmetry holds in the decay rates of these modes to better than 30%. With future data we expect the branching ratios of $D_s\to K^+ η^\prime$ and $D \to K^+η^\prime$ to move upward and downward by $\sim\!\! 1σ$, respectively. Subsequently I discuss the implications of the LHCb measurements of the CP asymmetries in $D\to K^+K^-$ and $D\to π^+π^-$ for generic scenarios of new physics. New-physics contributions should have imprints on other CP asymmetries as well and can be tested through sum rules. Promising decays are $D_s^+\to K^0π^+$, $D^+\to \bar K^0K^+$, $D^0\to K^0 \bar K^{*0}$, $D^0\to \bar K^0 K^{*0}$, $D_s^+\to K^{*0}π^+$, and $D^+\to \bar K^{*0}K^+$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_00157 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Branching fractions and CP asymmetries in charm meson decays Nierste, Ulrich High Energy Physics - Phenomenology I present a consistent way to include $η$-$η^\prime$ mixing in global analyses of two-body decays of heavy hadrons employing the approximate flavour-SU(3) symmetry of QCD. The framework is applied to $D\to P η^\prime$ decays, where $P$ denotes a pseudoscalar meson. The result shows that flavour-SU(3) symmetry holds in the decay rates of these modes to better than 30%. With future data we expect the branching ratios of $D_s\to K^+ η^\prime$ and $D \to K^+η^\prime$ to move upward and downward by $\sim\!\! 1σ$, respectively. Subsequently I discuss the implications of the LHCb measurements of the CP asymmetries in $D\to K^+K^-$ and $D\to π^+π^-$ for generic scenarios of new physics. New-physics contributions should have imprints on other CP asymmetries as well and can be tested through sum rules. Promising decays are $D_s^+\to K^0π^+$, $D^+\to \bar K^0K^+$, $D^0\to K^0 \bar K^{*0}$, $D^0\to \bar K^0 K^{*0}$, $D_s^+\to K^{*0}π^+$, and $D^+\to \bar K^{*0}K^+$. |
| title | Branching fractions and CP asymmetries in charm meson decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2504.00157 |