Results 91 to 100 of about 35,230 (208)

Improved Theory of the Muonium Hyperfine Structure

, 1994
Terms contributing to the hyperfine structure of the muonium ground state at the level of few tenths of kHz have been evaluated. The $\alpha^2 (Z\alpha)$ radiative correction has been calculated numerically to the precision of 0.02 kHz.
A. Karimkhodzhaev, E. E. Salpeter, E. Klempt, F. G. Mariam, F. Nez, G. T. Bodwin, J. R. Sapirstein, M. A. B. Bég, M. E. Cage, M. I. Eides, M. I. Eides, M. I. Eides, M. I. Eides, M. I. Eides, M. I. Eides, M. I. Eides, M. I. Eides, M. I. Eides, M. I. Eides, M. I. Eides, M. I. Eides, M. Nio, M. Weitz, S. G. Karshenboim, T. Kinoshita, T. Kinoshita, V. W. Hughes, W. E. Caswell   +27 more
core   +2 more sources

Quantum GraviElectro Dynamics

Annalen der Physik, Volume 538, Issue 1, January 2026.
The BRST invariant Lagrangian of the gravitationally interacting U(1)$U(1)$ gauge theory, namely the Quantum GraviElectro Dynamics (QGED). The Yan–Mills theory with the Hilbert–Einstein gravitational Lagrangian, namely the Yang–Mills–Utiyama (YMU) theory, is defined and quantised using the standard procedure. The theory is perturbatively renormalisable,
Yoshimasa Kurihara
wiley   +1 more source

Sympathetic cooling of $^4$He$^+$ ions in a radiofrequency trap

, 2004
We have generated Coulomb crystals of ultracold $^4$He$^+$ ions in a linear radiofrequency trap, by sympathetic cooling via laser--cooled $^9$Be$^+$. Stable crystals containing up to 150 localized He$^+$ ions at $\sim$20 mK were obtained.
B. Roth, H. Schnitzler, S. Schiller, S. A. Burrows, U. Fröhlich   +4 more
core   +1 more source

ISR corrections to associated HZ production at future Higgs factories

Physics Letters B, 2018
We evaluate the QED corrections due to initial state radiation (ISR) to associated Higgs boson production in electron–positron (e+e−) annihilation at typical energies of interest for the measurement of the Higgs properties at future e+e− colliders, such ...
Mario Greco, Guido Montagna, Oreste Nicrosini, Fulvio Piccinini, Gabriele Volpi   +4 more
doaj   +1 more source

High-precision epsilon expansions of single-mass-scale four-loop vacuum bubbles

, 2005
In this article we present a high-precision evaluation of the expansions in $\e=(4-d)/2$ of (up to) four-loop scalar vacuum master integrals, using the method of difference equations developed by S. Laporta. We cover the complete set of `QED-type' master
, Aleksi Vuorinen, D.I. Kazakov, D.J. Broadhurst, D.J. Broadhurst, H.R.P. Ferguson, J.A.M. Vermaseren, K. Kajantie, P. Mastrolia, S. Laporta, V.A. Smirnov, Y. Schröder, Y. Schröder, York Schröder   +13 more
core   +1 more source

Combining QED and QCD transverse-momentum resummation for Z boson production at hadron colliders

Journal of High Energy Physics, 2018
We consider the transverse-momentum (q T ) distribution of Z bosons produced in hadronic collisions. At small values of q T , we perform the analytic resummation of the logarithmically enhanced QED contributions up to next-to-leading logarithmic accuracy,
Leandro Cieri, Giancarlo Ferrera, Germán F. R. Sborlini   +2 more
doaj   +1 more source

Combined Effect of QCD Resummation and QED Radiative Correction to W boson Observables at the Tevatron

, 2004
A precise determination of the W boson mass at the Fermilab Tevatron requires a theoretical calculation in which the effects of the initial-state multiple soft-gluon emission and the final-state photonic correction are simultaneously included .
Cao, Qing-Hong, Yuan, C. -P.
core   +1 more source

QED corrections in B ¯ → K ¯ ℓ + ℓ − $$ \overline{B}\to \overline{K}{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-} $$ at the double-differential level

Journal of High Energy Physics, 2020
We present a detailed analysis of QED corrections to B ¯ → K ¯ ℓ + ℓ − $$ \overline{B}\to \overline{K}{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-} $$ decays at the double-differential level.
Gino Isidori, Saad Nabeebaccus, Roman Zwicky   +2 more
doaj   +1 more source

Axion-like-particle decay in strong electromagnetic backgrounds

Journal of High Energy Physics, 2019
The decay of a massive pseudoscalar, scalar and U(1) boson into an electron-positron pair in the presence of strong electromagnetic backgrounds is calculated.
B. King, B. M. Dillon, K. A. Beyer, G. Gregori   +3 more
doaj   +1 more source

Status and accuracy of the Monte Carlo generators for luminosity measurements

, 2010
The status and accuracy of the precision Monte Carlo generators used for luminosity measurements at flavour factories is reviewed. It is shown that, thanks to a considerable, long-term effort in tuned comparisons between the predictions of independent ...
Balossini, G, Bignamini, C, Calame, C M Carloni, Montagna, G, Nicrosini, O, Piccinini, F   +5 more
core   +1 more source