CP violation in B(s)→ϕK decays: Standard Model and isospin-dependent New Physics
Abstract
The penguin-dominated B→ϕK decays provide sensitive probes of physics beyond the Standard Model. Interpreting them at increasing experimental precision requires control of doubly Cabibbo-suppressed hadronic contributions. Using a factorization approach, we obtain Standard Model benchmarks for the branching ratios and CP-violating observables, including the hadronic phase shift in Bd0→ϕKS. The Bs0→ϕKS channel, in which the corresponding penguin effects are not Cabibbo-suppressed, offers additional insight into these contributions. Comparing the neutral and charged B→ϕK modes further allows the construction of isospin observables. We discuss their Standard-Model expectations and sensitivity to New Physics in the I=0 and I=1 sectors. The available data are consistent with the Standard Model, while leaving substantial room for New Physics contributions.
Related
- Measurement of time-dependent CP violation parameters in B0 → KS0 π0 γ decays at Belle and Belle II
- Unexpectedly large violation of isospin symmetry in nucleus-nucleus collisions at CERN SPS energies
- Influence of configuration-interaction on isospin impurities and isospin symmetry breaking corrections to superallowed 0+→ 0+ beta decays
- Exploring asymmetries in three-body cLFV lepton decays: probing CP violation in HNL extensions of the SM
- Observation of several sources of C P violation in B+ → K+ π+ π- decays
BibTeX
@misc{fleischer2026violation,
title = {{CP violation in $B_(s)\toϕK$ decays: Standard Model and isospin-dependent New Physics}},
author = {Robert Fleischer and Jelle Groot and K. Keri Vos},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.22970},
eprint = {2609.22970},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.22970},
}
RIS
TY - UNPB
TI - CP violation in B_(s)→ϕK decays: Standard Model and isospin-dependent New Physics
AU - Robert Fleischer
AU - Jelle Groot
AU - K. Keri Vos
PY - 2026
DA - 2026/09/19
PB - arXiv
DO - 10.48550/arxiv.2609.22970
UR - https://arxiv.org/abs/2609.22970
AB - The penguin-dominated B→ϕK decays provide sensitive probes of physics beyond the Standard Model. Interpreting them at increasing experimental precision requires control of doubly Cabibbo-suppressed hadronic contributions. Using a factorization approach, we obtain Standard Model benchmarks for the branching ratios and CP-violating observables, including the hadronic phase shift in B_d^0→ϕK_S. The B_s^0→ϕK_S channel, in which the corresponding penguin effects are not Cabibbo-suppressed, offers additional insight into these contributions. Comparing the neutral and charged B→ϕK modes further allows the construction of isospin observables. We discuss their Standard-Model expectations and sensitivity to New Physics in the I=0 and I=1 sectors. The available data are consistent with the Standard Model, while leaving substantial room for New Physics contributions.
ER -