Light-cone sum rules for $B \to π$ form factors revisited TeX Export

@misc{citeulike:2229978, abstract = {We reconsider and update the QCD light-cone sum rules for \$B\to \pi\$ form factors. The gluon radiative corrections to the twist-2 and twist-3 terms in the correlation functions are calculated. The \$\bar{MS}\$ \$b\$-quark mass is employed, instead of the one-loop pole mass used in the previous analyses. The light-cone sum rule for \$f^+\_{B\pi}(q^2)\$ is fitted to the measured \$q^2\$-distribution in \$B\to \pi l \nu\_l\$, fixing the input parameters with the largest uncertainty: the Gegenbauer moments of the pion distribution amplitude. For the \$B\to \pi\$ vector form factor at zero momentum transfer we predict \$f^+\_{B\pi}(0)= 0.26^{+0.04}\_{-0.03}\$. Combining it with the value of the product \$|V\_{ub}f^+\_{B\pi}(0)|\$ extracted from experiment, we obtain \$|V\_{ub}|=(3.5\pm 0.4\pm 0.2\pm 0.1) \times 10^{-3}\$. In addition, the scalar and penguin \$B\to \pi\$ form factors \$f^0\_{B\pi}(q^2)\$ and \$f^T\_{B\pi}(q^2)\$ are calculated.}, archivePrefix = {arXiv}, author = {Duplancic, G. and Khodjamirian, A. and Th and Melic, B. and Offen, N.}, citeulike-article-id = {2229978}, citeulike-linkout-0 = {http://arxiv.org/abs/0801.1796}, citeulike-linkout-1 = {http://arxiv.org/pdf/0801.1796}, day = {11}, eprint = {0801.1796}, keywords = {bdecay, factor, form, sum\_rules}, month = {Jan}, posted-at = {2008-01-14 11:10:52}, priority = {2}, title = {Light-cone sum rules for \$B \to \pi\$ form factors revisited}, url = {http://arxiv.org/abs/0801.1796}, year = {2008} }

TY - ELEC ID - citeulike:2229978 L3 - citeulike-article-id:2229978 N2 - We reconsider and update the QCD light-cone sum rules for $B\to \pi$ form factors. The gluon radiative corrections to the twist-2 and twist-3 terms in the correlation functions are calculated. The $\bar{MS}$ $b$-quark mass is employed, instead of the one-loop pole mass used in the previous analyses. The light-cone sum rule for $f^+_{B\pi}(q^2)$ is fitted to the measured $q^2$-distribution in $B\to \pi l \nu_l$, fixing the input parameters with the largest uncertainty: the Gegenbauer moments of the pion distribution amplitude. For the $B\to \pi$ vector form factor at zero momentum transfer we predict $f^+_{B\pi}(0)= 0.26^{+0.04}_{-0.03}$. Combining it with the value of the product $|V_{ub}f^+_{B\pi}(0)|$ extracted from experiment, we obtain $|V_{ub}|=(3.5\pm 0.4\pm 0.2\pm 0.1) \times 10^{-3}$. In addition, the scalar and penguin $B\to \pi$ form factors $f^0_{B\pi}(q^2)$ and $f^T_{B\pi}(q^2)$ are calculated. TI - Light-cone sum rules for $B \to \pi$ form factors revisited KW - bdecay KW - factor KW - form KW - sum_rules AU - Duplancic, G AU - Khodjamirian, A AU - Th AU - Melic, B AU - Offen, N PY - 2008/Jan/11/ UR - http://arxiv.org/abs/0801.1796 ER -