4,475 research outputs found

    Complementarity in direct searches for additional Higgs bosons at the LHC and the International Linear Collider

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    We discuss complementarity of discovery reaches of heavier neutral Higgs bosons and charged Higgs bosons at the LHC and the International Linear Collider (ILC) in two Higgs doublet models (2HDMs). We perform a comprehensive analysis on their production and decay processes for all types of Yukawa interaction under the softly-broken discrete symmetry which is introduced to avoid flavour changing neutral currents, and we investigate parameter spaces of discovering additional Higgs bosons at the ILC beyond the LHC reach. We find that the 500 GeV run of the ILC with the integrated luminosity of 500 fb^{-1} shows an advantage for discovering the additional Higgs bosons in the region where the LHC cannot discover them with the integrated luminosity of 300 fb^{-1}. For the 1 TeV run of the ILC with the integrated luminosity of 1 ab^{-1}, production processes of an additional Higgs boson associated with the top quark can be useful as discovery channels in some parameter spaces where the LHC with the integrated luminosity of 3000 fb^{-1} cannot reach. It is emphasized that the complementary study at the LHC and the ILC is useful not only to survey additional Higgs bosons at the TeV scale, but also to discriminate types of Yukawa interaction in the 2HDM.Comment: 42 pages, 55 eps files; revised Figs. 1-3 due to the small change of parameters, added references, version for publication in Nuclear Physics

    Higgs Decay hμτh\to\mu\tau with Minimal Flavor Violation

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    We consider the tentative indication of flavor-violating Higgs boson decay hμτh\to\mu\tau recently reported in the CMS experiment within the framework of minimal flavor violation. Specifically, we adopt the standard model extended with the seesaw mechanism involving right-handed neutrinos plus effective dimension-six operators satisfying the minimal flavor violation principle in the lepton sector. We find that it is possible to accommodate the CMS hμτh\to\mu\tau signal interpretation provided that the right-handed neutrinos couple to the Higgs boson in some nontrivial way. We take into account empirical constraints from other lepton-flavor-violating processes and discuss how future searches for the μeγ\mu\to e\gamma decay and μe\mu\to e conversion in nuclei may further probe the lepton-flavor-violating Higgs couplings.Comment: 15 pages, no figures, minor errors corrected, references added, matches publicatio

    Revisiting the BB-physics anomalies in RR-parity violating MSSM

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    In recent years, several deviations from the Standard Model predictions in semileptonic decays of BB-meson might suggest the existence of new physics which would break the lepton-flavour universality. In this work, we have explored the possibility of using muon sneutrinos and right-handed sbottoms to solve these BB-physics anomalies simultaneously in RR-parity violating minimal supersymmetric standard model. We find that the photonic penguin induced by exchanging sneutrino can provide sizable lepton flavour universal contribution due to the existence of logarithmic enhancement for the first time. This prompts us to use the two-parameter scenario (C9V,C9U)(C^{\rm V}_9, \, C^{\rm U}_9) to explain bs+b \to s \ell^+ \ell^- anomaly. Finally, the numerical analyses show that the muon sneutrinos and right-handed sbottoms can explain bs+b \to s \ell^+ \ell^- and R(D())R(D^{(\ast)}) anomalies simultaneously, and satisfy the constraints of other related processes, such as BK()ννˉB \to K^{(\ast)} \nu \bar\nu decays, BsBˉsB_s-\bar B_s mixing, ZZ decays, as well as D0μ+μD^0 \to \mu^+ \mu^-, τμρ0\tau \to \mu \rho^0, BτνB \to \tau \nu, DsτνD_s \to \tau \nu, τKν\tau \to K \nu, τμγ\tau \to \mu \gamma, and τμμμ\tau \to \mu\mu\mu decays.Comment: 10 pages, 8 figures, matches to the version published in EPJ
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