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Oliver","submitted_at":"2005-04-22T13:21:36Z","abstract_excerpt":"We perform a phenomenological analysis of the decays $B \\to D^{**}\\pi$, where $D^{**}$ is a $P$-wave excited meson with total angular momentum $j = {1 \\over 2}$ or ${3 \\over 2}$ for the light cloud, recently measured by the Belle Collaboration in the modes $\\bar{B}^0\\to D^{**+}\\pi^-$ (Class I) and $B^- \\to D^{**0}\\pi^-$ (Class III). Making the reasonable assumption of naive factorization, that we test in $B \\to D(D^*)\\pi$ decays, Class I decays allow to extract the Isgur-Wise form factors $\\tau_{1/2}(w)$, $\\tau_{3/2}(w)$ at $w \\cong w_{max}$ ($q^2 \\cong 0$). 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Le Yaouanc, F. Jugeau, J.-C. Raynal, L. Oliver","submitted_at":"2005-04-22T13:21:36Z","abstract_excerpt":"We perform a phenomenological analysis of the decays $B \\to D^{**}\\pi$, where $D^{**}$ is a $P$-wave excited meson with total angular momentum $j = {1 \\over 2}$ or ${3 \\over 2}$ for the light cloud, recently measured by the Belle Collaboration in the modes $\\bar{B}^0\\to D^{**+}\\pi^-$ (Class I) and $B^- \\to D^{**0}\\pi^-$ (Class III). Making the reasonable assumption of naive factorization, that we test in $B \\to D(D^*)\\pi$ decays, Class I decays allow to extract the Isgur-Wise form factors $\\tau_{1/2}(w)$, $\\tau_{3/2}(w)$ at $w \\cong w_{max}$ ($q^2 \\cong 0$). 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