Zobrazeno 1 - 10
of 154
pro vyhledávání: '"Witzel Oliver"'
Autor:
Witzel Oliver
Publikováno v:
EPJ Web of Conferences, Vol 312, p 04001 (2024)
The combination of precise experimental measurements and theoretical predictions allows to extract Cabibbo-Kobayashi-Maskawa (CKM) matrix elements or constrain flavor changing processes in the standard model. Focusing at theoretical predictions, we r
Externí odkaz:
https://doaj.org/article/a5b776b3223847189452a5f6047cd354
Autor:
Hasenfratz, Anna, Witzel, Oliver
Lattice simulations have observed a novel strong coupling symmetric mass generation (SMG) phase for the SU(3) gauge system with $N_f=8$ fundamental fermions (represented by two sets of staggered fields) at very large renormalized coupling ($g^2_{GF}
Externí odkaz:
http://arxiv.org/abs/2412.10322
Autor:
Black, Matthew, Harlander, Robert, Lange, Fabian, Rago, Antonio, Shindler, Andrea, Witzel, Oliver
Fermionic gradient flow in combination with the short-flow-time expansion provides a computational method where the renormalisation of hadronic matrix elements on the lattice can be simplified to address e.g. the issue that operators with different m
Externí odkaz:
http://arxiv.org/abs/2409.18891
Autor:
Witzel, Oliver
The combination of precise experimental measurements and theoretical predictions allows to extract Cabibbo-Kobayashi-Maskawa (CKM) matrix elements or constrain flavor changing processes in the standard model. Focusing at theoretical predictions, we r
Externí odkaz:
http://arxiv.org/abs/2409.02646
Autor:
Brower, Richard C., Culver, Christopher, Cushman, Kimmy K., Fleming, George T., Hasenfratz, Anna, Howarth, Dean, Ingoldby, James, Jin, Xiao Yong, Kribs, Graham D., Meyer, Aaron S., Neil, Ethan T., Osborn, James C., Owen, Evan, Park, Sungwoo, Rebbi, Claudio, Rinaldi, Enrico, Schaich, David, Vranas, Pavlos, Weinberg, Evan, Witzel, Oliver
We present non-perturbative lattice calculations of the low-lying meson and baryon spectrum of the SU(4) gauge theory with fundamental fermion constituents. This theory is one instance of stealth dark matter, a class of strongly coupled theories, whe
Externí odkaz:
http://arxiv.org/abs/2312.07836
Autor:
Black, Matthew, Harlander, Robert, Lange, Fabian, Rago, Antonio, Shindler, Andrea, Witzel, Oliver
Neutral meson mixing and meson lifetimes are theory-side parametrised in terms four-quark operators which can be determined by calculating weak decay matrix elements using lattice Quantum Chromodynamics. While calculations of meson mixing matrix elem
Externí odkaz:
http://arxiv.org/abs/2310.18059
We use lattice simulations and the continuous renormalization-group method, based on the gradient flow, to calculate the $\beta$ function and anomalous dimensions of the SU(3) gauge theory with $N_f=10$ flavors of fermions in the fundamental represen
Externí odkaz:
http://arxiv.org/abs/2306.07236
We use lattice simulations and the continuous renormalization-group method, based on the gradient flow, to study a candidate theory of composite Higgs and a partially composite top. The model is an SU(4) gauge theory with four Dirac fermions in each
Externí odkaz:
http://arxiv.org/abs/2304.11729
Autor:
Flynn, Jonathan M., Hill, Ryan C., Jüttner, Andreas, Soni, Amarjit, Tsang, J. Tobias, Witzel, Oliver
Publikováno v:
Phys. Rev. D 107 (2023), 114512
Semileptonic $B_s \to K \ell \nu$ decays provide an alternative $b$-decay channel to determine the CKM matrix element $|V_{ub}|$, and to obtain a $R$-ratio to investigate lepton-flavor-universality violations. Results for the CKM matrix element may a
Externí odkaz:
http://arxiv.org/abs/2303.11280
Publikováno v:
Phys. Rev. D 108, 014502 (2023)
Nonperturbative determinations of the renormalization group $\beta$ function are essential to connect lattice results to perturbative predictions of strongly coupled gauge theories and to determine the $\Lambda$ parameter or the strong coupling const
Externí odkaz:
http://arxiv.org/abs/2303.00704