TWO LOCALITY CORRECTIONS

Additions and Corrections

Two-loop Corrections-to- the Cosmological Constant*

The two-loop contributions to the induced cosmological constant are computed in a matterless Einstein theory of gravity expanded about a Minkowski background with no cosmological term present in the classical action. The regularization-independent cancellation of the contribution to one-loop order is found not to occur to two-loop order. Submitted to Physics Letters B * Work supported by the De...

Two-loop corrections to Bhabha scattering.

The two-loop radiative photonic corrections to Bhabha scattering are computed in the leading order of the small electron mass expansion up to the nonlogarithmic term. After including the soft photon bremsstrahlung, we obtain the infrared-finite result for the differential cross section, which can directly be applied to a precise luminosity determination of the present and future e+ e- colliders.

Who Wants a Good Reputation? Two Corrections

The first displayed equation is a new requirement, while the second displayed equation tightens the previous condition that φ′ ∈ (0, 1 − λ) (note that ρ/[ρ + λ(1 − ρ)] < 1 − λ). Both conditions hold if λ and φ′ are not too large, which is the case we have in mind. The first addition ensures that the slope of φ(φ|g) with respect to φ, evaluated at zero, is positive. This ensures that there are v...

Two-loop QED Corrections to Bhabha Scattering

Bhabha scattering, ee → ee, is a crucial process in the phenomenology of particle physics. Its relevance is mainly due to the fact that it is the process employed to determine the luminosity L at ee colliders: in fact, L = NBhabha/σth, where NBhabha is the rate of Bhabha events and σth is the Bhabha scattering cross section calculated from theory. Two kinematic regions are of special interest f...