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Configuration-Space View of High-Energy Scattering

Richard A. Brandt*

  • Department of Physics, New York University, New York, New York 10003

  • *Alfred P. Sloan Foundation Fellow.

Phys. Rev. D 4, 444 – Published 15 July, 1971

DOI: https://doi.org/10.1103/PhysRevD.4.444

Abstract

We consider the amplitude T(ν=2q·p,κ=q2,δ=2q·Δ;t=Δ2) for the reaction A(q)+C(p)B(q)+D(p1), where A and B are scalar currents and C and D are on-shell scalar particles. We assume scaling behavior, TAν1F(ω,τ;t) for ν, with ωκν, τ=δν, and t fixed, and Regge behavior, TRνα(t)β(κ,δ;t) for ν, with κ, δ, and t fixed and implement these behaviors on integral representations with suitable spectral functions. For δ=0, we derive the commutativity relation limω0limAT=limκlimRT and the asymptotic behavior f(λ,0;t)λα(t) for the coefficient f(x·p,x·Δ;t) of the leading light-cone (LC) singularity of the Fourier transform of T. [f isrelatedto F by F(ω,τ;t)0dλeiλωf(λ,λτ;t).] Thus, the leading LC singularity determines the trajectory function α(t) and thus provides a configuration-space view of high-energy behavior. This generalizes our previous results for Δ=0. To see what can happen for δ0, we use the ladder approximation for T. We again derive a commutativity relation limτ0limω0limAT=limκlimδlimRT, butnow f(λ,λτ;t)const0. Thus the large-λ behavior of f is quite different for τ=0 and for τ0. This behavior can, in particular, be nice at τ=0, and the assumption that 0<|0dλf(λ,0;t)|< is seen to lead to interesting constraints on the Regge trajectory.

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