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Register a new userRecent studies of CP violation in bottom meson decays at Belle
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P. Vanhoefer
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We present a summary of recent studies on $CP$ violation with the Belle experiment using the final data sample of $772 times 10^{6}$ Bbar{B} pairs produced at the Ypsilon(4S) resonance at the KEK asymmetric e^+ e^- collider. We discuss preliminary measurements of the branching fraction, the polarization and the $CP$ asymmetries of the decay $B^0 rightarrow rho^{+} rho^{-}$ and an updated constraint on the CKM angle $phi_2$ from the $Btorhorho$ system. Being also related to $phi_2$, we present a preliminary measurement of the branching fraction of $B^0rightarrow pi^0pi^0$ decays. Last, a preliminary model independent dalitz plot analysis of the decay $B^0 rightarrow D^0[K_S^0pi^+pi^-]K^{*0}$ is presented and its sensitivity to the CKM angle $phi_3$ is discussed.
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We report a measurement of the CP violation parameters in b->c anti-c d decays. Mixing-induced CP violation involving this transition is studied using a sample of B0->J/psi pi0, D*+D*- and D*+-D-+ decays with a data set accumulated at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. CP violation parameters are extracted from a fit to the distributions of time intervals between two B0 meson decay vertexes.
In this article we study the rare B-meson decay via two on-shell almost-degenerate Majorana Heavy Neutrinos, into two charged leptons and two pseudoscalar mesons ($B^{pm} to D^0 ell^{pm}_1 ell^{pm}_2 pi^{mp}$). We consider the scenario where the heavy neutrino masses are $sim 2$ GeV and the heavy-light mixing coefficients are $|B_{ell N}|^2 sim 10^{-5}$, and evaluate the possibility to measure the CP-asymmetry at Belle II. We present some realistic conditions under which the asymmetry could be detected.
We report on a search for CP violation in tau -> K^0_S pi nu_tau decays using a data sample of 699 fb^{-1} collected in the Belle experiment at the KEKB electron-positron asymmetric-energy collider. The CP asymmetry is measured in four bins of the invariant mass of the K^0_S pi system and found to be compatible with zero with a precision of O(10^{-3}) in each mass bin. Limits for the CP violation parameter Im(eta_S) are given at a 90 % confidence level. These limits are |Im(eta_S)|<0.026 or better, depending on the parameterization used to describe the hadronic form factors and improve upon previous limits by one order of magnitude.
We report on recent results on radiative and electroweak penguin B decays at Belle at KEKB accelerator.
Quarkonium is the bound state of a heavy quark and its anti-quark counterpart. The study of this system has experienced a renaissance thanks to results from e+e- collider experiments, including discoveries of long-predicted conventional quarkonia, and unusual states consisting of four quarks. The Belle Experiment operated at KEK in Japan from 1999-2010. Analysis of the collected data continues to produce new findings. The Belle II experiment is a substantial upgrade of both the Belle detector and the KEKB accelerator, aiming to collect 50 times more data beginning in 2018. This talk presented recent Belle results related to hadronic and radiative decays in the bottomonium system. It described the capabilities of Belle II to explore these topics, with a particular focus on the physics reach of the first data, where unique opportunities exist to make an immediate impact in this area.
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