McGill University

Showing 1996 · hep-phShow all

21 papers · 2 filters

hep-ph1996★ 45 cited

A Prediction for the 4-Loop βFunction

John Ellis, Marek Karliner, Mark. A. Samuel

We predict that the four-loop contribution β_3 to the QCD βfunction in the MS-bar prescription is given by β_3\simeq 23,600(900) - 6,400(200) N_f + 350(70) N_f^2 + 1.5 N_f^3, where…

hep-ph1996★ 13 cited

Direct photon production in polarized hadron collisions at collider and fixed target energies

A. P. Contogouris, Z. Merebashvili

Recently determined next-to-leading order sets of polarized parton distributions are used to study large-p_T $p p \to γ + X$ at $s = 38, 100 an d 500 G e V$ . Cert…

hep-ph1996★ 4 cited

Derivation of the Lamb Shift using an Effective Field Theory

Patrick Labelle, S. Mohammad Zebarjad

We rederive the $O (α^{5})$ shift of the hydrogen levels in the non-recoil ( $m_{e} / m_{P} \to 0$ ) limit using Nonrelativistic QED (NRQED), an effective field theory developed by Caswell an…

hep-ph1996★ 13 cited

Exact evaluation of the nuclear form factor for new kinds of majoron emission in neutrinoless double beta decay

C. Barbero, J. M. Cline, F. Krmpotic +1

We have developed a formalism, based on the Fourier-Bessel expansion, that facilitates the evaluation of matrix elements involving nucleon recoil operators, such as appear in serve…

hep-ph1996★ 212 cited

Electroweak Phase Transition in Two Higgs Doublet Models

James M. Cline, Pierre-Anthony Lemieux

We reexamine the strength of the first order phase transition in the electroweak theory supplemented by an extra Higgs doublet. The finite-temperature effective potential, $V_{eff}…

hep-ph1996★ 85 cited

Effective field theories for QED bound states: extending Nonrelativistic QED to study retardation effects

Patrick Labelle

Nonrelativistic QED bound states are difficult to study because of the presence of at least three widely different scales: the masses, three-momenta ( $p_{i}$ ) and kinetic energies ($…