66,291 research outputs found

    Light Front Approach for Strong and Weak Decays of Pentaquarks

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    Strong and weak decays of pentaquarks are studied in the framework of the light-front approach.Comment: 3 pages, talk given at the 2004 DPF Meeting, Riverside, CA. Aug 26-31, 200

    Possibly New Charmed Baryon States from Bˉ0ppˉD0\bar B^0\to p\bar p D^{0} Decay

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    We examine the invariant mass spectrum of D0pD^{0}p in Bˉ0ppˉD0\bar B^0\to p\bar p D^{0} decay measured by BABAR and find that through the 2-step processes of Bˉ0Bc+(D0p)pˉ\bar B^0\to {\bf B_c^+}(\to D^{0} p)\bar p, where Bc{\bf B_c} denotes a charmed baryon state, some of the peaks can be identified with the established Σc(2800)+\Sigma_c(2800)^+, Λc(2880)+\Lambda_c(2880)^+ and Λc(2940)+\Lambda_c(2940)^+. Moreover, in order to account for the measured spectrum, it is necessary to introduce a new charmed baryon resonance with (m,Γ)=(3212±20,167±34)(m,\,\Gamma)=(3212\pm 20,\,167\pm 34) MeV.Comment: 8 pages, 1 figure, title changed and discussions updated, version accepted for publication in Phys. Rev.

    Final stare interaction enhancement effect on the near threshold p\bar p system in B^\pm\to p\bar p \p^\pm decay

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    We discuss the low-mass enhancement effect in the baryon-antibaryon invariant mass in three-body baryonic B decays using final state interactions in the framework of Regge theory. We show that the rescattering between baryonic pair can reproduce the observed mass spectrum.Comment: 7 pages, 11 figure

    An extension of tribimaximal lepton mixing

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    Harrison, Perkins and Scott have proposed simple charged lepton and neutrino mass matrices that lead to the tribimaximal mixing UTBMU_{\rm TBM}. We consider in this work an extension of the mass matrices so that the leptonic mixing matrix becomes UPMNS=VLUTBMWU_{\rm PMNS}=V_L^{\ell\dagger}U_{\rm TBM}W, where VLV_L^\ell is a unitary matrix needed to diagonalize the charged lepton mass matrix and WW measures the deviation of the neutrino mixing matrix from the bimaximal form. Hence, corrections to UTBMU_{\rm TBM} arise from both charged lepton and neutrino sectors. Following our previous work to assume a Qin-Ma-like parametrization VQMV_{\rm QM} for the charged lepton mixing matrix VLV_L^\ell in which the {\it CP}-odd phase is approximately maximal, we study the phenomenological implications in two different scenarios: VL=VQMV_L^\ell=V_{\rm QM}^\dagger and VL=VQMV_L^\ell=V_{\rm QM}. We find that the latter is more preferable, though both scenarios are consistent with the data within 3σ3\sigma ranges. The predicted reactor neutrino mixing angle θ13\theta_{13} in both scenarios is consistent with the recent T2K and MINOS data. The leptonic {\it CP} violation characterized by the Jarlskog invariant JCPJ_{\rm CP} is generally of order 10210^{-2}.Comment: 20 pages and 8 figures, Accepted in Phys.Review