Zobrazeno 1 - 10
of 89
pro vyhledávání: '"Roman Zwicky"'
Autor:
Matthew Rowe, Roman Zwicky
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 7, Pp 1-39 (2024)
Abstract Based on explicitly gauge invariant interpolating operators we compute complete next-leading order QED-corrections for leptonic decays. These are sizeable since the helicity-suppression in V-A interactions allows for structure-dependent coll
Externí odkaz:
https://doaj.org/article/87a11c0edc4d4b89a49955e825597b2c
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 5, Pp 1-29 (2024)
Abstract We derive constraints on the four dimensional energy-momentum tensor from gravitational and gauge anomalies. Our work can be considered an extension of Duff’s analysis [1] to include parity-odd terms and explicit symmetry breaking. The con
Externí odkaz:
https://doaj.org/article/b507f8fafb974c879583f69418bf6dc2
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 12, Pp 1-22 (2023)
Abstract We compute the trace, diffeomorphism and Lorentz anomalies of a free Weyl fermion in a gravitational background field by path integral methods. This is achieved by regularising the variation of the determinant of the Weyl operator building o
Externí odkaz:
https://doaj.org/article/56dd6adf612b4dfc9bc6fdb8bb48d5fa
Autor:
Matthew Rowe, Roman Zwicky
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 6, Pp 1-23 (2023)
Abstract We compute the electromagnetic mass difference for the B-, D- and K-mesons using QCD sum rules with double dispersion relations. For the B- and D-mesons we also compute the linear quark mass correction, whereas for the K the standard soft th
Externí odkaz:
https://doaj.org/article/6ebb1491fc594de8acd00afd23309a3f
Autor:
Saad Nabeebaccus, Roman Zwicky
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 11, Pp 1-20 (2022)
Abstract Standard interpolating operators for charged mesons, e.g. J B = b ¯ $$ \overline{b} $$ iγ 5 u for B − , are not gauge invariant in QED and therefore problematic for perturbative methods. We propose a gauge invariant interpolating operato
Externí odkaz:
https://doaj.org/article/97eefc65d2334cbe9908b95bb0c4a009
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 10, Pp 1-27 (2022)
Abstract Using analytic results obtained in a meson effective theory, that includes all infrared sensitive logs, we build a dedicated Monte Carlo framework to describe QED corrections in B ¯ $$ \overline{B} $$ → K ¯ $$ \overline{K} $$ ℓ + ℓ
Externí odkaz:
https://doaj.org/article/177291c4f7634a14b785dc44456ae87b
Autor:
Luigi Del Debbio, Roman Zwicky
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 8, Pp 1-21 (2022)
Abstract As the number of fermion fields is increased, gauge theories are expected to undergo a transition from a QCD-like phase, characterised by confinement and chiral symmetry breaking, to a conformal phase, where the theory becomes scale-invarian
Externí odkaz:
https://doaj.org/article/f469c615d55e4eaea6e5955fe45b6666
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 12, Pp 1-67 (2021)
Abstract We present the first analytic O α s $$ \mathcal{O}\left({\alpha}_s\right) $$ -computation at twist-1,2 of the B ¯ u , d , s $$ {\overline{B}}_{u,d,s} $$ → γ form factors within the framework of sum rules on the light-cone. These form fa
Externí odkaz:
https://doaj.org/article/8fb2e5653b6646ee923aac5437448298
Autor:
Gudrun Hiller, Roman Zwicky
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 11, Pp 1-25 (2021)
Abstract Following our earlier work we establish kinematic endpoint relations for baryon decays using the Wigner-Eckart theorem and apply them to 1 2 → 1 2 $$ \frac{1}{2}\to \frac{1}{2} $$ and 1 2 → 3 2 $$ \frac{1}{2}\to \frac{3}{2} $$ baryon tra
Externí odkaz:
https://doaj.org/article/57d6465d0f594830a271b18ea2098c4a
Autor:
Ben Pullin, Roman Zwicky
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 9, Pp 1-38 (2021)
Abstract The on-shell matrix elements, or couplings g H H ∗ H 1 γ $$ {g}_{H{H}^{\ast}\left({H}_1\right)\upgamma} $$ , describing the B D q ∗ $$ B{(D)}_q^{\ast } $$ → B(D) q γ and B 1q → B q γ (q = u, d, s) radiative decays, are determined
Externí odkaz:
https://doaj.org/article/1cc35bc33e884dd7a726f9e5d603fd23