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Register a new userSignals of a 2 TeV $W$ boson and a heavier $Z$ boson
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We construct an $SU(2)_Ltimes SU(2)_Rtimes U(1)_{B-L}$ model with a Higgs sector that consists of a bidoublet and a doublet, and with a right-handed neutrino sector that includes one Dirac fermion and one Majorana fermion. This model explains the Run 1 CMS and ATLAS excess events in the $e^+e^-jj$, $jj$, $Wh^0$ and $WZ$ channels in terms of a $W$ boson of mass near 1.9 TeV and of coupling $g_R$ in the 0.4--0.5 range, with the lower half preferred by limits on $t bar b$ resonances and Run 2 results. The production cross section of this $W$ boson at the 13 TeV LHC is in the 700--900 fb range, allowing sensitivity in more than 17 final states. We determine that the $Z$ boson has a mass in the 3.4--4.5 TeV range and several decay channels that can be probed in Run 2 of the LHC, including cascade decays via heavy Higgs bosons.
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We reconsider observables for discovering a heavy Higgs boson (with m_h > 2m_W) via its di-leptonic decays h -> WW -> l nu l nu. We show that observables generalizing the transverse mass that take into account the fact that both of the intermediate W bosons are likely to be on-shell give a significant improvement over the variables used in existing searches. We also comment on the application of these observables to other decays which proceed via narrow-width intermediates.
The hints from the LHC for the existence of a $W$ boson of mass around 1.9 TeV point towards a certain $SU(2)_Ltimes SU(2)_Rtimes U(1)_{B-L}$ gauge theory with an extended Higgs sector. We show that the decays of the $W$ boson into heavy Higgs bosons have sizable branching fractions. Interpreting the ATLAS excess events in the search for same-sign lepton pairs plus $b$ jets as arising from $W$ cascade decays, we estimate that the masses of the heavy Higgs bosons are in the 400--700 GeV range.
We present a renormalizable theory that includes a $W$ boson of mass in the 1.8-2 TeV range, which may explain the excess events reported by the ATLAS Collaboration in a $WZ$ final state, and by the CMS Collaboration in $e^+!e^- jj$, $Wh^0$ and $jj$ final states. The $W$ boson couples to right-handed quarks and leptons, including Dirac neutrinos with TeV-scale masses. This theory predicts a $Z$ boson of mass in the 3.4-4.5 TeV range. The cross section times branching fractions for the narrow $Z$ dijet and dilepton peaks at the 13 TeV LHC are 10 fb and 0.6 fb, respectively, for $M_{Z}= 3.4$ TeV, and an order of magnitude smaller for $M_{Z}= 4.5$ TeV.
The discovery of the Standard Model (SM) Higgs boson at the LHC completed the theory of electroweak and strong interactions. To determine the Higgs bosons intrinsic properties, more measurements on its various decay channels are still necessary. In this paper, we investigate $Hto ellbar{ell}Z$ and $Hto u_ellbar{ u}_ell Z$ (with $ell=e$, $mu$, $tau$) processes at the next-to-leading order electroweak accuracy. The total decay widths, and the differential decay rates with respect to various kinematic variables are obtained. For a typical choice of cut on the invariant mass of lepton pair, we find the branching ratios $mathcal{B}(Hto ellbar{ell}Z)=7.5times 10^{-4}$ (with $ell=e, mu$), $mathcal{B}(Hto tau^-tau^+ Z)=7.3times 10^{-4}$, and $mathcal{B}(Hto u_ellbar{ u}_ell Z)=1.5times 10^{-3}$ (with $ell=e, mu, tau$), which are attainable in the LHC experiments.
Detecting TeV--PeV cosmic neutrinos provides crucial tests of neutrino physics and astrophysics. The statistics of IceCube and the larger proposed IceCube-Gen2 demand calculations of neutrino-nucleus interactions subdominant to deep-inelastic scattering, which is mediated by weak-boson couplings to nuclei. The largest such interactions are W-boson and trident production, which are mediated instead through photon couplings to nuclei. In a companion paper [1], we make the most comprehensive and precise calculations of those interactions at high energies. In this paper, we study their phenomenological consequences. We find that: (1) These interactions are dominated by the production of on-shell W-bosons, which carry most of the neutrino energy, (2) The cross section on water/iron can be as large as 7.5%/14% that of charged-current deep-inelastic scattering, much larger than the quoted uncertainty on the latter, (3) Attenuation in Earth is increased by as much as 15%, (4) W-boson production on nuclei exceeds that through the Glashow resonance on electrons by a factor of $simeq$ 20 for the best-fit IceCube spectrum, (5) The primary signals are showers that will significantly affect the detection rate in IceCube-Gen2; a small fraction of events give unique signatures that may be detected sooner.
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