Publications [#287677] of Thomas C. Mehen

search www.slac.stanford.edu.
Papers Published
  1. Fleming, S; Mehen, T, Leptoproduction of J/ψ, Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 57 no. 3 (1998), pp. 1846-1857 .

    Abstract:
    We study leptoproduction of J/ψ at large Q2 within the nonrelativistic QCD (NRQCD) factorization formalism. The cross section is dominated by color-octet terms that are of order αs. The color-singlet term, which is of order α2s, is shown to make a small contribution to the total cross section. We also calculate the tree diagrams for color-octet production at order α2s in a region of phase space where there is no leading color-octet contribution. We find that in this regime the color-singlet contribution dominates. We argue that nonperturbative corrections arising from diffractive leptoproduction, higher twist effects, and higher order terms in the NRQCD velocity expansion should be suppressed as Q2 is increased. Therefore, the color-octet matrix elements 〈script O signψ8(1S0)〉 and 〈script O signψ8(3P0)〉 can be reliably extracted from this process. Finally, we point out that an experimental measurement of the polarization of leptoproduced J/ψ will provide an excellent test of the NRQCD factorization formalism.