Study of $\bar B^0 \to D^0 μ^+μ^-$ Decay in Perturbative QCD Approach

Details Study of $\bar B^0 \to D^0 μ^+μ^-$ Decay in Perturbative QCD Approach Study of $\bar B^0 \to D^0 μ^+μ^-$ Decay in Perturbative QCD Approach

2011-06-14

arxiv.org/abs/1106.2711v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 5 figures, Final version to be published in JHEP

Scientific paper

Within the perturbative QCD approach and ignoring the contributions of long distance and subleading penguin loops, we investigate $\bar B^0 \to D^0 \mu^+\mu^-$ decay in the large recoiling kinematic region in the Standard Model. At the tree level, $\bar B^0$ decays to $D^0$ by exchanging a $W$ boson accompanied by a virtual photon emission from the valence quarks of $\bar B^0$ and $D^0$ meson, then the virtual photon decays to the lepton pair. Numerically, we find that the branching ratio decreases rapidly as the $q^2$ increases, and the branching ratio of $ \bar B^0\to D^0\mu^+\mu^-$ is $(9.7_{-3.2}^{+4.2})\times 10^{-6}$ in the region $q^2 \in [1,5] \mathrm{GeV}^2$. The order of the branching ratio shows a possibility to study this interesting channel in the current $B$ factories and the Large Hadron Collider. The precise experimental data will help us to test the factorization approach and the QCD theory, in general.

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