We investigate the possibility to discover the charged Higgs via pp → W ± H ∓ → l + ET + bbjj process at LHC, which suffers from large QCD backgrounds. We optimize the kinematic cuts to suppress the backgrounds, so that the reconstruction of the charged Higgs through hadronic decay is possible. The angular distribution of the b-jet from H ± decay is investigated as a way to identify the charged scalar from vector bosons.
The next-to-minimal supersymmetric standard model (NMSSM) more naturally accommodates a Higgs boson with a mass of approximately 125 GeV than the minimal supersymmetric standard model (MSSM). In this work, we assume that the next-to-lightest CP-even Higgs boson h 2 is the SM-like Higgs boson h, whereas the lightest CP-even Higgs boson h 1 is dominantly singlet-like.We discuss the h 1 h 1 , h 2 h 2 , and h 1 h 2 pair production processes via gluon-gluon fusion at the LHC for an collision energy of 14 TeV, and we consider the cases in which one Higgs boson decays to bb and the other one decays to γγ or τ + τ − . We find that, for m h 1 62 GeV, the cross section of the gg → h 1 h 1 process is relatively large and maximally reaches 5400 fb, and the production rate of the h 1 h 1 → bbτ + τ − final state can reach 1500 fb, which make the detection of this final state possible for future searches of an integrated luminosity of 300 and 3000 f b −1 . This is mainly due to the contributions from the resonant production process pp → h 2 → h 1 h 1 and the relatively large branching ratio of h 1 → bb and h 1 → τ + τ − . The cross sections of the pp → h 2 h 2 and pp → h 1 h 2 production processes maximally reach 28 fb and 133 fb, respectively.
We study the charged Higgs production at LHC via its associated production with top quark. The kinematic cuts are optimized to suppress the background processes so that the reconstruction of the charged Higgs and top quark is possible. The angular distributions with respect to top quark spin are explored to study the Htb interaction at LHC.
The Mark II detector has been upgraded in preparation for its role as the first detector to take data at the Stanford Linear Collider. The new detector components include the central drift chamber, the time-of-flight system, the coil, the endcap electromagnetic calorimeters and the beam energy and luminosity measuring devices. There have also been improvements in detector hermeticity. All of the major components were installed for a test run at the PEP storage ring (VIs = 29 GeV) in 1985. This paper describes the upgraded detector, including its trigger and data acquisition systems, and gives performance figures for its components. Future improvements are also discussed.
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