### Abstract

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].

Original language | English |
---|---|

Number of pages | 1 |

Journal | Physical Review C - Nuclear Physics |

Volume | 68 |

Issue number | 3 |

DOIs | |

Publication status | Published - 2003 Jan 1 |

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### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

### Cite this

*Physical Review C - Nuclear Physics*,

*68*(3). https://doi.org/10.1103/PhysRevC.68.035208

}

*Physical Review C - Nuclear Physics*, vol. 68, no. 3. https://doi.org/10.1103/PhysRevC.68.035208

**Progress in the determination of the [Formula Presented] cross section.** / Durães, Francisco O.; Kim, Hungchong; Lee, Su Houng; Navarra, Fernando S.; Nielsen, Marina.

Research output: Contribution to journal › Article

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 - 2003/1/1

Y1 - 2003/1/1

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].

UR - http://www.scopus.com/inward/record.url?scp=85035307091&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85035307091&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.68.035208

DO - 10.1103/PhysRevC.68.035208

M3 - Article

VL - 68

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 3

ER -