Zobrazeno 1 - 10
of 3 874
pro vyhledávání: '"matrix elements"'
Autor:
The RQCD collaboration and the ALPHA collaboration, Simon Kuberski, Fabian Joswig, Sara Collins, Jochen Heitger, Wolfgang Söldner
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 7, Pp 1-44 (2024)
Abstract We present results for the leptonic decay constants of the D and Ds mesons from N f = 2 + 1 lattice QCD. We employ a set of 49 high statistics gauge ensembles generated by the Coordinated Lattice Simulations (CLS) effort utilising non-pertur
Externí odkaz:
https://doaj.org/article/e2db68b22e7a4b1d8fd4250b9479fef3
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 7, Pp 1-26 (2024)
Abstract X-space schemes are gauge-invariant, regulator-independent renormalization schemes that are defined by requiring position-space correlation functions of gauge-invariant operators to be equal to their noninteracting values at particular kinem
Externí odkaz:
https://doaj.org/article/9f65e7637c384482861d5377c65fca4e
Autor:
Chien-Yeah Seng
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 7, Pp 1-22 (2024)
Abstract We introduce a useful framework for high-precision studies of the neutron beta decay by merging the current algebra description and the fixed-order effective field theory calculation of the electroweak radiative corrections to the neutron ax
Externí odkaz:
https://doaj.org/article/6e9da12ded1d4bc6a45d851b61773251
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 7, Pp 1-19 (2024)
Abstract We compute the gravitational form factors A i , D i and c ¯ i $$ {\overline{c}}_i $$ of the scalar Yukawa theory using both the light-cone and covariant perturbation theory at the one-loop level. The light-cone formalism provides a potentia
Externí odkaz:
https://doaj.org/article/af2449343ba740c289e827f9902d2901
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 6, Pp 1-20 (2024)
Abstract We investigate the inverse moment of the B s -meson light-cone distribution amplitude (LCDA), denoted as λ B s $$ {\lambda}_{B_s} $$ and defined within the heavy quark effective theory, through the calculation of B s → η s form factors.
Externí odkaz:
https://doaj.org/article/103385a78bb14d29960d8de9069ff288
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 5, Pp 1-35 (2024)
Abstract The coupling of various charmonium mesons to a photon is studied using lattice QCD, giving access to radiative form factors and transitions, and probing the mesons’ structure. Methods are developed which allow the robust determination of a
Externí odkaz:
https://doaj.org/article/8e24460986b24fef8c5cdcbc8a986b1e
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 5, Pp 1-34 (2024)
Abstract Recently, formalism has been derived for studying electroweak transition amplitudes for three-body systems both in infinite and finite volumes. The formalism provides exact relations that the infinite-volume amplitudes must satisfy, as well
Externí odkaz:
https://doaj.org/article/af4e379c1c9445018943391df45d88a8
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 5, Pp 1-41 (2024)
Abstract We derive an explicit expression for the Lellouch-Lüscher (LL) factor in the K → 3π decays at leading order (without derivative couplings). Several important technical details are addressed, like a proper decomposition into the isospin a
Externí odkaz:
https://doaj.org/article/207d3d98dfe14b0d8aa682a740760ba2
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 5, Pp 1-26 (2024)
Abstract The gradient-flow formalism proves to be a useful tool in lattice calculations of quantum chromodynamics. For example, it can be used as a scheme to renormalize composite operators by inverting the short-flow-time expansion of the correspond
Externí odkaz:
https://doaj.org/article/8688e477c86e49589095402b2a1c941f