Taming Penguins: Towards High Precision Measurements in $ϕ_d$ and $ϕ_s$
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arXiv
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| Format: | Preprint |
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2025
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| author | De Bruyn, Kristof Fleischer, Robert Malami, Eleftheria |
| author_facet | De Bruyn, Kristof Fleischer, Robert Malami, Eleftheria |
| contents | Experimentally, the phases $ϕ_d$ and $ϕ_s$ are determined from CP asymmetry measurements in the "golden modes" $B_d^0\to J/ψK_{\mathrm{S}}^0$ and $B_s^0\to J/ψϕ$. At leading order, the theoretical interpretation of these measurements is straightforward. However, to reach high precision determinations of $ϕ_d$ and $ϕ_s$, which is essential in view of the searches for signs of beyond the SM physics, corrections from next-to-leading order effects need to be accounted for. These corrections primarily originate from so-called penguin topologies. Using the $SU(3)$ flavour symmetry, these corrections can be determined using suitably chosen control modes. Recent new CP asymmetry measurements from LHCb in $B\to DD$ and Belle-II in $B_d^0\to J/ψπ^0$ decays greatly improve our knowledge on the parameters describing the contribution from penguin topologies. These proceedings will discuss the current constraints on the penguin parameters in $B\to J/ψX$ and $B\to DD$ decays, provide corrected determinations for $ϕ_d$ and $ϕ_s$, and highlight what can be expected at the end of the HL-LHC and Belle-II programmes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_09414 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Taming Penguins: Towards High Precision Measurements in $ϕ_d$ and $ϕ_s$ De Bruyn, Kristof Fleischer, Robert Malami, Eleftheria High Energy Physics - Phenomenology Experimentally, the phases $ϕ_d$ and $ϕ_s$ are determined from CP asymmetry measurements in the "golden modes" $B_d^0\to J/ψK_{\mathrm{S}}^0$ and $B_s^0\to J/ψϕ$. At leading order, the theoretical interpretation of these measurements is straightforward. However, to reach high precision determinations of $ϕ_d$ and $ϕ_s$, which is essential in view of the searches for signs of beyond the SM physics, corrections from next-to-leading order effects need to be accounted for. These corrections primarily originate from so-called penguin topologies. Using the $SU(3)$ flavour symmetry, these corrections can be determined using suitably chosen control modes. Recent new CP asymmetry measurements from LHCb in $B\to DD$ and Belle-II in $B_d^0\to J/ψπ^0$ decays greatly improve our knowledge on the parameters describing the contribution from penguin topologies. These proceedings will discuss the current constraints on the penguin parameters in $B\to J/ψX$ and $B\to DD$ decays, provide corrected determinations for $ϕ_d$ and $ϕ_s$, and highlight what can be expected at the end of the HL-LHC and Belle-II programmes. |
| title | Taming Penguins: Towards High Precision Measurements in $ϕ_d$ and $ϕ_s$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2501.09414 |