标题： 大-N_c 分析对介子-重子相互作用在手征顺序 Q^3 上的约束 显示英文标题

标题： Constraints from a large-N_c analysis on meson-baryon interactions at chiral order Q^3

摘要： 我们考虑由上夸克、下夸克和奇夸克构成的QCD中具有J^P =\frac{1}{2}^+ 或 J^P =\frac{3}{2}^+ 量子数的重子场的手征拉格朗日量。 特定的反项类别的手征阶为Q^3，并在两体水平上对介子-重子相互作用有所贡献，该类反项被构建出来。 总共我们找到24项。 为了便于实际应用，我们建立了一组22个低能常数的求和规则，这些规则由QCD在大-N_c极限下的含义所确定。 在这样的约束条件下，只剩下2个独立的未知参数，需要通过格点QCD模拟或直接从实验截面测量来确定。 在次领头阶，我们得到5个参数。 显示英文摘要

摘要： We consider the chiral Lagrangian for baryon fields with J^P =\frac{1}{2}^+ or J^P =\frac{3}{2}^+ quantum numbers as constructed from QCD with up, down and strange quarks. The specific class of counter terms that are of chiral order Q^3 and contribute to meson-baryon interactions at the two-body level is constructed. Altogether we find 24 terms. In order to pave the way for realistic applications we establish a set of 22 sum rules for the low-energy constants as they are implied by QCD in the large-N_c limit. Given such a constraint there remain only 2 independent unknown parameters that need to be determined by either Lattice QCD simulations or directly from experimental cross section measurements. At subleading order we arrive at 5 parameters.