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PreprintarXiv licencearXiv

Constraining the parameter space of a singlet down-type vector-like quark

  • Mohammad Ahmady
  • Maryam Bibi
  • Ruben Sandapen
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Abstract

We consider a minimal New Physics scenario in which the Standard Model is extended by singlet down-type vector-like quark(VLQ). We constrain its parameter space using the measured branching ratios for Bs → μ+ μ-, B → Xs μ+ μ- and B → Xs γ, which are all consistent with Standard Model predictions. Besides considering the tree-level flavor-changing-neutral-current amplitude allowed in this NP scenario, we account for a Higgs--VLQ loop amplitude and show that their resulting interference drives the VLQ mass into the discovery reach via direct searches at the LHC. We also examine the implications of this minimal NP scenario for the rare B → K νν̅ decay where there is a persistent tension between the SM prediction and the Belle II measurements.

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Cite

BibTeXRIS
BibTeX
@misc{ahmady2026constraining,
  title = {{Constraining the parameter space of a singlet down-type vector-like quark}},
  author = {Mohammad Ahmady and Maryam Bibi and Ruben Sandapen},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.07317},
  eprint = {2611.07317},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.07317},
}
RIS
TY  - UNPB
TI  - Constraining the parameter space of a singlet down-type vector-like quark
AU  - Mohammad Ahmady
AU  - Maryam Bibi
AU  - Ruben Sandapen
PY  - 2026
DA  - 2026/11/05
PB  - arXiv
DO  - 10.48550/arxiv.2611.07317
UR  - https://arxiv.org/abs/2611.07317
AB  - We consider a minimal New Physics scenario in which the Standard Model is extended by singlet down-type vector-like quark(VLQ). We constrain its parameter space using the measured branching ratios for B_s → μ^+ μ^-, B → X_s μ^+ μ^- and B → X_s γ, which are all consistent with Standard Model predictions. Besides considering the tree-level flavor-changing-neutral-current amplitude allowed in this NP scenario, we account for a Higgs--VLQ loop amplitude and show that their resulting interference drives the VLQ mass into the discovery reach via direct searches at the LHC. We also examine the implications of this minimal NP scenario for the rare B → K νν̅ decay where there is a persistent tension between the SM prediction and the Belle II measurements.
ER  -