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    New Physics Working Group Summary of LCWS2000 at FNAL

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    Here I summarize P5-WG (New/Alternative Physics Working Group) of LCWS2000@FNAL, held on Oct 24-28, 2000. There were 13 talks altogether, 7 talks on collider signals from new particles/interactions and 6 talks on extra dimensional physics. We had very active and hot discussions among participants for those new/alternative physics/ideas.Comment: New/Alternative Physics Working Group Summary, talk given at LCWS2000@FNAL, Oct. 2000. (12 pages, 2 figures

    Sensitivity bounds on heavy neutrino mixing UμN2|U_{\mu N}|^2 and UτN2|U_{\tau N}|^2 from LHCb upgrade

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    Decays of heavy pseudoscalar mesons BB, BcB_c, BsB_s and DsD_s at LHCb upgrade are considered, which produce either two equal sign muons or taus. In addition, we consider the analogous decays with opposite sign muons or taus. All these decays are considered to be mediated by a heavy on-shell neutrino NN. Such decays of BB mesons, if not detected, will give in general stringent upper bounds on the heavy-light mixing parameter UμN2|U_{\mu N}|^2 as a function of the neutrino mass MN1M_N \sim 1 GeV, principally due to the large expected number of produced mesons BB. While some of the decays of the other mentioned mesons are attractive due to a weaker CKM-suppression, the expected produced number of such mesons is significantly smaller that that of BB's; therefore, the sensitivity bounds from such decays are in general comparable or less restrictive. When τ\tau pairs are produced, only two types of such decays are significant: B±,Bc±τ±τ±πB^{\pm}, B_{c}^{\pm} \to \tau^{\pm} \tau^{\pm} \pi^{\mp} (and τ±τπ±\tau^{\pm} \tau^{\mp} \pi^{\pm}), giving us stringent upper bounds on UτN2|U_{\tau N}|^2; the other decays with a pair of τ\tau, such as B0D()τ+τ+πB^0 \to D^{(*)-} \tau^+ \tau^+ \pi^- (and D()τ+τπ+D^{(*)-} \tau^+ \tau^- \pi^+), are prohibited or very suppressed by kinematics.Comment: 13 pages, 4 figures; the paper is a continuation of our work arXiv:1705.09403; v4: improved legends in Fig.