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Dispersive analysis of B → K (*) and B s → ϕ form factors (2023)
Journal Article
Gubernari, N., Reboud, M., van Dyk, D., & Virto, J. (2023). Dispersive analysis of B → K (*) and B s → ϕ form factors. Journal of High Energy Physics, 2023(12), Article 153. https://doi.org/10.1007/jhep12%282023%29153

We propose a stronger formulation of the dispersive (or unitarity) bounds à la Boyd-Grinstein-Lebed (BGL), which are commonly applied in analyses of the hadronic form factors for B decays. In our approach, the existing bounds are split into several n... Read More about Dispersive analysis of B → K (*) and B s → ϕ form factors.

50 Years of quantum chromodynamics (2023)
Journal Article
Gross, F., Klempt, E., Brodsky, S. J., Buras, A. J., Burkert, V. D., Heinrich, G., …Zhou, X. (2023). 50 Years of quantum chromodynamics. The European Physical Journal C, 83(12), Article 1125. https://doi.org/10.1140/epjc/s10052-023-11949-2

Quantum Chromodynamics, the theory of quarks and gluons, whose interactions can be described by a local SU(3) gauge symmetry with charges called “color quantum numbers”, is reviewed; the goal of this review is to provide advanced Ph.D. students a com... Read More about 50 Years of quantum chromodynamics.

Testable likelihoods for beyond-the-standard model fits (2023)
Journal Article
Beck, A., Reboud, M., & van Dyk, D. (2023). Testable likelihoods for beyond-the-standard model fits. The European Physical Journal C, 83(12), Article 1115. https://doi.org/10.1140/epjc/s10052-023-12294-0

Studying potential BSM effects at the precision frontier requires accurate transfer of information from low-energy measurements to high-energy BSM models. We propose to use normalising flows to construct likelihood functions that achieve this transfe... Read More about Testable likelihoods for beyond-the-standard model fits.

New determination of |V ub /V cb | from B s 0 → { K −, D s − } μ + ν (2023)
Journal Article
Bolognani, C., van Dyk, D., & Vos, K. K. (2023). New determination of |V ub /V cb | from B s 0 → { K −, D s − } μ + ν. Journal of High Energy Physics, 2023(11), Article 82. https://doi.org/10.1007/jhep11%282023%29082

We update the full set of B¯s → K form factors using light-cone sum rules with an on-shell kaon. Our approach determines the relevant sum rule parameters — the duality thresholds — from a Bayesian fit for the first time. Using a modified version of t... Read More about New determination of |V ub /V cb | from B s 0 → { K −, D s − } μ + ν.

Toward a complete description of b → uℓ − ν ¯ within the Weak Effective Theory decays (2023)
Journal Article
Leljak, D., Melić, B., Novak, F., Reboud, M., & van Dyk, D. (2023). Toward a complete description of b → uℓ − ν ¯ within the Weak Effective Theory decays. Journal of High Energy Physics, 2023(8), Article 63. https://doi.org/10.1007/jhep08%282023%29063

We fit the available data on exclusive semileptonic b → uℓ−ν¯ decays within the Standard Model and in the Weak Effective Theory. Assuming Standard Model dynamics, we find Vub=3.59−0.12+0.13×10−3. Lifting this assumption, we obtain stringent constrain... Read More about Toward a complete description of b → uℓ − ν ¯ within the Weak Effective Theory decays.

Resolving the flavor structure in the MFV-SMEFT (2023)
Journal Article
Bruggisser, S., van Dyk, D., & Westhoff, S. (2023). Resolving the flavor structure in the MFV-SMEFT. Journal of High Energy Physics, 2023(2), https://doi.org/10.1007/jhep02%282023%29225

We constrain the flavor structure of Wilson coefficients in the Standard Model Effective Field Theory (SMEFT) from data. In the SMEFT, new physics effects in couplings of up-type and down-type quarks are related through the Cabibbo-Kobayashi-Maskawa... Read More about Resolving the flavor structure in the MFV-SMEFT.