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Collider-flavour complementarity from the bottom to the top (2025)
Journal Article
Atkinson, O., Englert, C., Kirk, M., & Tetlalmatzi-Xolocotzi, G. (2025). Collider-flavour complementarity from the bottom to the top. The European Physical Journal C, 85(3), Article 258. https://doi.org/10.1140/epjc/s10052-024-13739-w

Motivated by recently observed anomalies in the flavour sector, we analyse the potential of measurements of top quarks at the Large Hadron Collider (LHC) to provide complementary constraints on interactions that shape low-energy precision investigati... Read More about Collider-flavour complementarity from the bottom to the top.

A simple parametrisation of the pion form factor (2025)
Journal Article
Kirk, M., Kubis, B., Reboud, M., & van Dyk, D. (2025). A simple parametrisation of the pion form factor. Physics Letters B, 861, Article 139266. https://doi.org/10.1016/j.physletb.2025.139266

We discuss a novel and simple parametrisation of the pion vector form factor that transparently connects spacelike and timelike regions of the momentum transfer q2. Our parametrisation employs the framework of conformal mapping and respects the known... Read More about A simple parametrisation of the pion form factor.

Updated Bs -mixing constraints on new physics models for b→sℓ+ℓ− anomalies (2018)
Journal Article
Di Luzio, L., Kirk, M., & Lenz, A. (2018). Updated Bs -mixing constraints on new physics models for b→sℓ+ℓ− anomalies. Physical Review D, 97(9), Article 095035. https://doi.org/10.1103/physrevd.97.095035

Many new physics models that explain the intriguing anomalies in the b-quark flavor sector are severely constrained by Bs mixing, for which the Standard Model prediction and experiment agreed well until recently. The most recent Flavour Lattice Avera... Read More about Updated Bs -mixing constraints on new physics models for b→sℓ+ℓ− anomalies.

Charming new physics in rare B decays and mixing? (2018)
Journal Article
Jäger, S., Leslie, K., Kirk, M., & Lenz, A. (2018). Charming new physics in rare B decays and mixing?. Physical Review D, 97(1), Article 015021. https://doi.org/10.1103/physrevd.97.015021

We conduct a systematic study of the impact of new physics in quark-level b → ccs¯ transitions on B physics, in particular rare B decays and B-meson lifetime observables. We find viable scenarios where a sizable effect in rare semileptonic B decays c... Read More about Charming new physics in rare B decays and mixing?.

Dimension-six matrix elements for meson mixing and lifetimes from sum rules (2017)
Journal Article
Kirk, M., Lenz, A., & Rauh, T. (2017). Dimension-six matrix elements for meson mixing and lifetimes from sum rules. Journal of High Energy Physics, 2017(12), Article 68. https://doi.org/10.1007/jhep12%282017%29068

The hadronic matrix elements of dimension-six ∆F = 0, 2 operators are crucial inputs for the theory predictions of mixing observables and lifetime ratios in the B and D system. We determine them using HQET sum rules for three-point correlators. The r... Read More about Dimension-six matrix elements for meson mixing and lifetimes from sum rules.