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Register a new userProspects for the Observation of a Higgs Boson with $Htotau^+tau^-to l^+l^-sla{p_t}$ Associated with One Jet at the LHC
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The sensitivity of the LHC experiments to the Standard Model Higgs using $Htotautauto l^+l^-sla{p_t}$ associated with one high $P_T$ jet in the mass range $110 <M_H<150 gev$/c$^2$ is investigated. A cut and Neural Network based event selections are chosen to optimize the expected signal significance with this decay mode. A signal significance of about $6.6 sigma$ can be achieved for $M_H=120 gev$/c$^2$ with $30 $fb$^{-1}$ of integrated luminosity for one experiment only. With this approach, experimental issues related to tagging forward jets and to the application of a central jet veto are simplified considerably.
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The signature produced by the Standard Model Higgs boson in the Vector Boson Fusion (VBF) mechanism is usually pinpointed by requiring two well separated hadronic jets, one of which (at least) of them tends to be in the forward direction. With the increase of instantaneous luminosity at the LHC, the isolation of the Higgs boson produced with the VBF mechanism is rendered more challenging. In this paper the feasibility of single jet tagging is explored in a high-luminosity scenario. It is demonstrated that the separation in rapidity between the tagging jet and the Higgs boson can be effectively used to isolate the VBF signal. This variable is robust from the experimental and QCD stand points. Single jet tagging allows us to probe the spin-CP quantum numbers of the Higgs boson.
We present a search for a standard model Higgs boson decaying to two $W$ bosons that decay to leptons using the full data set collected with the CDF II detector in $sqrt{s}=1.96$ TeV $pbar{p}$ collisions at the Fermilab Tevatron, corresponding to an integrated luminosity of 9.7 fb${}^{-1}$. We obtain no evidence for production of a standard model Higgs boson with mass between 110 and 200 GeV/$c^2$, and place upper limits on the production cross section within this range. We exclude standard model Higgs boson production at the 95% confidence level in the mass range between 149 and 172 GeV/$c^2$, while expecting to exclude, in the absence of signal, the range between 155 and 175 GeV/$c^2$. We also interpret the search in terms of standard model Higgs boson production in the presence of a fourth generation of fermions and within the context of a fermiophobic Higgs boson model. For the specific case of a standard model-like Higgs boson in the presence of fourth-generation fermions, we exclude at the 95% confidence level Higgs boson production in the mass range between 124 and 200 GeV/$c^2$, while expecting to exclude, in the absence of signal, the range between 124 and 221 GeV/$c^2$.
We investigate the sensitivity of the projected TeV muon collider to the gauged $L^{}_{mu}$-$L^{}_{tau}$ model. Two processes are considered: $Z$-mediated two-body scatterings $mu^+ mu^- to ell^+ ell^-$ with $ell = mu$ or $tau$, and scattering with initial state photon emission, $mu^+ mu^- to gamma Z,~Z to ell overline{ell}$, where $ell$ can be $mu$, $tau$ or $ u_{mu/tau}$. We quantitatively study the sensitivities of these two processes by taking into account possible signals and relevant backgrounds in a muon collider experiment with a center-of-mass energy $sqrt{s} = 3~{rm TeV}$ and a luminosity $L=1~{rm ab^{-1}}$. For two-body scattering one can exclude $Z$ masses $M^{}_{Z} lesssim 100~{rm TeV}$ with $mathcal{O}(1)$ gauge couplings. When $M^{}_{Z} lesssim 1~{rm TeV} <sqrt{s}$, one can exclude $g gtrsim 2times 10^{-2}$. The process with photon emission is more powerful than the two-body scattering if $M^{}_{Z} < sqrt{s}$. For instance, a sensitivity of $g simeq 4 times 10^{-3}$ can be achieved at $M^{}_{Z} = 1~{rm TeV}$. The parameter spaces favored by the $(g-2)^{}_{mu}$ and $B$ anomalies with $M^{}_{Z} > 100~{rm GeV}$ are entirely covered by a muon collider.
We investigate the prospects of discovering the top quark decay into a charm quark and a Higgs boson ($t to c h^0$) in top quark pair production at the CERN Large Hadron Collider (LHC). A general two Higgs doublet model is adopted to study flavor changing neutral Higgs (FCNH) interactions. We perform a parton level analysis as well as Monte Carlo simulations using textsc{Pythia}~8 and textsc{Delphes} to study the flavor changing top quark decay $t to c h^0$, followed by the Higgs decaying into $tau^+ tau^-$, with the other top quark decaying to a bottom quark ($b$) and two light jets ($tto bWto bjj$). To reduce the physics background to the Higgs signal, only the leptonic decays of tau leptons are used, $tau^+tau^- to e^pmmu^mp +slashed{E}_T$, where $slashed{E}_T$ represents the missing transverse energy from the neutrinos. In order to reconstruct the Higgs boson and top quark masses as well as to effectively remove the physics background, the collinear approximation for the highly boosted tau decays is employed. Our analysis suggests that a high energy LHC at $sqrt{s} = 27$ TeV will be able to discover this FCNH signal with an integrated luminosity $mathcal{L} = 3$ ab$^{-1}$ for a branching fraction ${cal B}(t to ch^0) agt 1.4 times 10^{-4}$ that corresponds to a FCNH coupling $|lambda_{tch}| agt 0.023$. This FCNH coupling is significantly below the current ATLAS combined upper limit of $|lambda_{tch}| = 0.064$.
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