TY - JOUR
T1 - [Formula Presented] reaction near threshold in a chiral power counting approach
AU - da Rocha, Carlos A.
AU - Miller, Gerald A.
AU - van Kolck, Ubirajara
PY - 2000
Y1 - 2000
N2 - Power-counting arguments are used to organize the interactions contributing to the [Formula Presented] reactions near threshold. We estimate the contributions from the three formally leading mechanisms: the Weinberg-Tomozawa (WT) term, the impulse term, and the Δ-excitation mechanism. Subleading but potentially large mechanisms, including S-wave pion rescattering, the Galilean correction to the WT term, and short-ranged contributions are also examined. The WT term is shown to be numerically the largest, and the other contributions are found to approximately cancel. Similarly to the reaction [Formula Presented] the computed cross sections are considerably smaller than the data. We discuss possible origins of this discrepancy.
AB - Power-counting arguments are used to organize the interactions contributing to the [Formula Presented] reactions near threshold. We estimate the contributions from the three formally leading mechanisms: the Weinberg-Tomozawa (WT) term, the impulse term, and the Δ-excitation mechanism. Subleading but potentially large mechanisms, including S-wave pion rescattering, the Galilean correction to the WT term, and short-ranged contributions are also examined. The WT term is shown to be numerically the largest, and the other contributions are found to approximately cancel. Similarly to the reaction [Formula Presented] the computed cross sections are considerably smaller than the data. We discuss possible origins of this discrepancy.
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U2 - 10.1103/PhysRevC.61.034613
DO - 10.1103/PhysRevC.61.034613
M3 - Article
AN - SCOPUS:85035262254
VL - 61
SP - 12
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
SN - 0556-2813
IS - 3
ER -