Dou Chao

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Dark sectors charged under a new Abelian interaction have recently received much attention in the context of dark matter models. These models introduce a light new mediator, the so-called dark photon (A^{'}), connecting the dark sector to the standard model. We present a search for a dark photon in the reaction e^{+}e^{-}→γA^{'}, A^{'}→e^{+}e^{-},(More)
The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B → X(s)γ plus B → X(d)γ, is studied using a data sample of (382.8 ± 4.2) × 10(6)Υ(4S) → BB decays collected by the BABAR experiment at SLAC. The spectrum is used to extract the branching fraction B(B → X(s)γ) = (3.21 ± 0.33) × 10(-4) for E(γ) >1.8 GeV and the direct CP(More)
We search for the rare flavor-changing neutral current process B^{+}→K^{+}τ^{+}τ^{-} using data from the BABAR experiment. The data sample, collected at the center-of-mass energy of the ϒ(4S) resonance, corresponds to a total integrated luminosity of 424  fb^{-1} and to 471×10^{6}  BB[over ¯] pairs. We reconstruct one B meson, produced in the(More)
for mixing-induced CP violation using partial reconstruction of [bar over B][superscript 0] D[superscript *+]}X[superscript-][bar over ][subscript ]and kaon tagging. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
We study the processes γγ → K 0 S K AE π ∓ and γγ → K þ K − π 0 using a data sample of 519 fb −1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e þ e − collider at center-of-mass energies at and near the ΥðnSÞ (n ¼ 2, 3, 4) resonances. We observe η c decays to both final states and perform Dalitz plot analyses using a(More)
et al. " Time-Dependent Analysis of B[superscript 0] K[0 over S][superscript ][superscript +] Decays and Studies of the K[superscript +][superscript ][superscript +] System in B[superscript +] K[superscript +][superscript ][superscript +] decays. Article is made available in accordance with the publisher's policy and may be subject to US copyright law.(More)