ar X iv : h ep - l at / 9 71 10 28 v 1 1 5 N ov 1 99 7 1 First study of B → π semileptonic decay form factors using NRQCD
نویسندگان
چکیده
We present a quenched calculation of the form factors of the semileptonic weak decay B → πl¯ ν with O(1/mQ) NRQCD heavy quark and Wilson light quark on a 16 3 × 32 lattice at β = 5.8. The form factors are evaluated at six heavy quark masses, in the range of mQ ∼ 1.5 − 8 GeV. 1/mQ dependence of matrix elements are investigated and compared with HQET predictions. We observe clear signal for the form factors near q 2 max , even at the b-quark mass range. f 0 (q 2 max) is compared with fB/fπ based on the soft pion theorem and significant difference is observed.
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تاریخ انتشار 1997