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Register a new userExploring CP-violation, via heavy neutrino oscillations, in rare B meson decays at Belle II
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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.
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In this work, we study the lepton flavor and lepton number violating $B_{c}$ meson decays via two intermediate on-shell Majorana neutrinos $N_j$ into two charged leptons and a charged pion $B_{c}^{pm} to mu^{pm} N_j to mu^{pm} tau^{pm} pi^{mp}$. We evaluated the possibility to measure the modulation of the decay width along the detector length produced as a consequence of the lepton flavor violating process, in a scenario where the heavy neutrinos masses range between $2.0$ GeV $leq M_N leq 6.0$ GeV. We study some realistic conditions which could lead to the observation of this phenomenon at futures $B$ factories such HL-LHCb.
Rare and flavour-changing neutral current decays of the B meson are an important probe in the search for physics beyond the Standard Model. There have recently been several anomalies in rare B decays, and lepton-universality measurements, specifically involving the $bto sell^+ell^-$ quark transition. These results tend towards a non-Standard-Model interpretation. The Belle II experiment is a next-generation b physics experiment located at SuperKEKB, an upgraded B factory $e^+e^-$ collider, in Tsukuba, Japan. The first collisions are expected in early 2018 with full physics data expected in 2019. This document describes prospects for several rare B decays at Belle II including $bto sell^+ell^-$ processes and others, such as $bto(s,,d)gamma$ and $bto s ubar u$. Areas where the Belle II program is complementary to that of the currently running LHCb experiment are highlighted.
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.
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.
Measurements of CP--violating observables in neutrino oscillation experiments have been studied in the literature as a way to determine the CP--violating phase in the mixing matrix for leptons. Here we show that such observables also probe new neutrino interactions in the production or detection processes. Genuine CP violation and fake CP violation due to matter effects are sensitive to the imaginary and real parts of new couplings. The dependence of the CP asymmetry on source--detector distance is different from the standard one and, in particular, enhanced at short distances. We estimate that future neutrino factories will be able to probe in this way new interactions that are up to four orders of magnitude weaker than the weak interactions. We discuss the possible implications for models of new physics.
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