TY - JOUR

T1 - Progress in the determination of the [Formula Presented] cross section

AU - Durães, Francisco O.

AU - Kim, Hungchong

AU - Lee, Su Houng

AU - Navarra, Fernando S.

AU - Nielsen, Marina

PY - 2003

Y1 - 2003

N2 - Improving previous calculations, we compute the [Formula Presented] cross section using QCD sum rules. Our sum rules for the [Formula Presented] [Formula Presented] and [Formula Presented] hadronic matrix elements are constructed by using vacuum-pion correlation functions, and we work up to twist-4 in the soft-pion limit. Our results suggest that using meson exchange models is perfectly acceptable, provided that they include form factors and that they respect chiral symmetry. After evaluating a thermal average we get [Formula Presented] at [Formula Presented].

AB - Improving previous calculations, we compute the [Formula Presented] cross section using QCD sum rules. Our sum rules for the [Formula Presented] [Formula Presented] and [Formula Presented] hadronic matrix elements are constructed by using vacuum-pion correlation functions, and we work up to twist-4 in the soft-pion limit. Our results suggest that using meson exchange models is perfectly acceptable, provided that they include form factors and that they respect chiral symmetry. After evaluating a thermal average we get [Formula Presented] at [Formula Presented].

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U2 - 10.1103/PhysRevC.68.035208

DO - 10.1103/PhysRevC.68.035208

M3 - Article

AN - SCOPUS:85035307091

VL - 68

SP - 11

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 3

ER -