Dispersive analysis of KL mu 3 and KLe3 scalar and vector form factors using KTeV data

作者：Abouzaid E^*; Arenton M; Barker A R; Bellantoni L; Blucher E; Bock G J; Cheu E; Coleman R; Corcoran M D; Cox B; Erwin A R; Escobar C O; Glazov A; Gomes R A; Gouffon P; Hsiung Y B; Jensen D A; Kessler R; Kotera K; Ledovskoy A; McBride P L; Monnier E; Nguyen H; Niclasen R; Phillips D G II; Ramberg E J; Ray R E; Ronquest M; Santos E; Slater W; Smith D; Solomey N; Swallow E C; Toale P A; Tschirhart R; Wah Y W

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, 81(5): 052001.

DOI：10.1103/PhysRevD.81.052001

Using the published KTeV samples of K(L) -> pi(+/-)e(-/+)nu and K(L) -> pi(+/-)mu(-/+)nu decays, we perform a reanalysis of the scalar and vector form factors based on the dispersive parametrization. We obtain phase-space integrals I(K)(e) = 0.15446 +/- 0.00025 and I(K)(mu) = 0.10219 +/- 0.00025. For the scalar form factor parametrization, the only free parameter is the normalized form factor value at the Callan-Treiman point (C); our best-fit results in InC = 0.1915 +/- 0.0122. We also study the sensitivity of C to different parametrizations of the vector form factor. The results for the phase-space integrals and C are then used to make tests of the standard model. Finally, we compare our results with lattice QCD calculations of F(K)/F(pi) and f(+)(0).

• 出版日期2010-3-1