A bstract Finite energy QCD sum rules with Legendre polynomial integration kernels are used to determine the heavy meson decay constant f B c $$ {f}_{B_c} $$ , and revisit f ~( B )and f B s $$ {f}_{B_s} $$ . Results exhibit excellent stability in a wide range of values of the integration radius in the complex squared energy plane, and of the order of the Legendre polynomial. Results are f B c $$ {f}_{B_c} $$ = 528 ± 19 MeV, f ~( B )= 186 ± 14 MeV, and f B s $$ {f}_{B_s} $$ = 222 ± 12 MeV.
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机译：使用Legendre多项式集成核的Bstract有限能量QCD和规则用于确定沉重的MESON衰减常数F B C $$ {F} _ {B_C} $$，并重新审视f〜（b）和f b s $$ { f} _ {b_s} $$。结果在复杂平方能量平面中的整体半径的宽范围内具有出色的稳定性，以及图例多项式的顺序。结果是f b c $$ {f} _ {b_c} $$ = 528±19 mev，f〜（b）= 186±14 mev，以及f b s $ {f} _ {b_s} $$ = 222 ±12 mev。
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