CP Violation in $B_{(s)}\toϕK$ Decays: Standard Model Benchmarks and Isospin-Breaking New Physics
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| Format: | Preprint |
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2026
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| _version_ | 1866911512651628544 |
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| author | Fleischer, Robert Groot, Jelle Vos, K. Keri |
| author_facet | Fleischer, Robert Groot, Jelle Vos, K. Keri |
| contents | The penguin loop-suppressed $B\toϕK$ decays are highly sensitive to contributions of hypothetical heavy new particles. Particularly interesting probes for testing the Standard Model and revealing such phenomena are provided by CP violation in the $B^0_d\toϕK_{\rm S}$ decay. Standard-Model estimates for the corresponding CP-violating observables are theoretically limited by doubly Cabibbo-suppressed penguin contributions. We study these effects using a factorization approach, and provide predictions for CP asymmetries, to be contrasted with future measurements. To gain additional insight into these hadronic effects, we propose the $B_s^0\toϕK_{\rm S}$ decay as a new channel. We predict the observables for this decay for which currently no measurements exist. By comparing $B^0_d\toϕK_{\rm S}$ and $B^+ \to ϕK^+$, we further derive state-of-the-art constraints on isospin observables within the Standard Model. The same framework enables probing of possible New-Physics contributions, including general effects and those with non-trivial isospin structure. Interesting prospects arise for the high-precision era of flavour physics ahead. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_13139 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | CP Violation in $B_{(s)}\toϕK$ Decays: Standard Model Benchmarks and Isospin-Breaking New Physics Fleischer, Robert Groot, Jelle Vos, K. Keri High Energy Physics - Phenomenology The penguin loop-suppressed $B\toϕK$ decays are highly sensitive to contributions of hypothetical heavy new particles. Particularly interesting probes for testing the Standard Model and revealing such phenomena are provided by CP violation in the $B^0_d\toϕK_{\rm S}$ decay. Standard-Model estimates for the corresponding CP-violating observables are theoretically limited by doubly Cabibbo-suppressed penguin contributions. We study these effects using a factorization approach, and provide predictions for CP asymmetries, to be contrasted with future measurements. To gain additional insight into these hadronic effects, we propose the $B_s^0\toϕK_{\rm S}$ decay as a new channel. We predict the observables for this decay for which currently no measurements exist. By comparing $B^0_d\toϕK_{\rm S}$ and $B^+ \to ϕK^+$, we further derive state-of-the-art constraints on isospin observables within the Standard Model. The same framework enables probing of possible New-Physics contributions, including general effects and those with non-trivial isospin structure. Interesting prospects arise for the high-precision era of flavour physics ahead. |
| title | CP Violation in $B_{(s)}\toϕK$ Decays: Standard Model Benchmarks and Isospin-Breaking New Physics |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2603.13139 |