Can the 750-GeV diphoton resonance be the singlet Higgs boson of custodial Higgs triplet model?

The observation of diphoton excess around the mass of 750 GeV in LHC Run-II motivates us to consider whether the singlet Higgs boson in the custodial Higgs triplet model can serve as a good candidate because an earlier study of comprehensive parameter scan shows that it can have the right mass in the viable mass spectra. By assuming the singlet Higgs mass at 750 GeV, its total width less than 50 GeV and imposing constraints from the LHC 8-TeV data, we identify an approximately linear region on the $(v_\Delta, \alpha)$ plane along which the exotic Higgs boson masses satisfy a specific hierarchy and have lower possible spectra, where $v_\Delta$ denotes the triplet vacuum expectation value and $\alpha$ is the mixing angle between the singlet Higgs boson and the standard model-like Higgs boson. Although the diphoton decay rate can be enhanced by charged Higgs bosons running in the loop in this region, it is mostly orders of magnitude smaller than that required for the observed production rate, except for the small $v_\Delta$ region when the diphoton fusion production mechanism becomes dominant. Nonetheless, this part of parameter space suffers from the problems of breakdown of perturbativity and large uncertainties in the photon parton distribution function of proton.Comment: 14 pages, 2 figures, and 2 tables; bugs in numerical calculations fixed, and discussions and conclusions changed; typo corrected; 16 pages, expanded with more detailed discussions, updated figures and tables, version to appear in the journa

Extracting entangled qubits from Majorana fermions in quantum dot chains through the measurement of parity

We propose a scheme for extracting entangled charge qubits from quantum-dot chains that support zero-energy edge modes. The edge mode is composed of Majorana fermions localized at the ends of each chain. The qubit, logically encoded in double quantum dots, can be manipulated through tunneling and pairing interactions between them. The detailed form of the entangled state depends on both the parity measurement (an even or odd number) of the boundary-site electrons in each chain and the teleportation between the chains. The parity measurement is realized through the dispersive coupling of coherent-state microwave photons to the boundary sites, while the teleportation is performed via Bell measurements. Our scheme illustrates \emph{localizable entanglement} in a fermionic system, which serves feasibly as a quantum repeater under realistic experimental conditions, as it allows for finite temperature effect and is robust against disorders, decoherence and quasi-particle poisoning.Comment: Accepted by Scientific Report

Estimating the Stochastic Sickness Effect on Employment, Worktime and Saving Decisions

This paper aims to study labor supply and saving decisions as a result of health uncertainty. O’Donnell (1995) suggested a theoretical positive relationship between working hours (or saving rate) and the perceived health uncertainty. That is, for risk-averse individuals, there exists a precaution motion to work harder and save more when facing the uncertainty for the health condition. We test this hypothetical relationship by applying the 2003-2005 data from the Panel Study of Family Dynamics (PSFD) in Taiwan. Following Hughes and Maguire’s approach (2003), our estimation result indicates that a stochastic sickness has positive effects on the decisions of working time and saving rate.Health, Uncertainty, Labor Supply, Saving

Radiative corrections to Higgs couplings with weak gauge bosons in custodial multi-Higgs models

We calculate 1-loop radiative corrections to the $hZZ$ and $hWW$ couplings in models with next--to--simplest Higgs sectors satisfying the electroweak $\rho$ parameter equal to 1 at tree level: the Higgs singlet model, the two-Higgs doublet models, and the Georgi-Machacek model. Under theoretical and current experimental constraints, the three models have different correlations between the deviations in the $hZZ$ and $hWW$ couplings from the standard model predictions. In particular, we find for each model predictions with no overlap with the other two models.Comment: 5 pages, 1 figur

Architecture of a Coat for the Nuclear Pore Membrane

Nuclear pore complexes (NPCs) reside in the nuclear membrane and mediate macromolecules exchange between the nucleus and cytoplasm. Although the protein components of NPCs, termed collectively nucleoporin, have been identified, how nucleoporins arrange in NPC, however, is still an enigma. NPC is a highly symmetric protein complex, which contains an eight-fold rotational symmetry across the center of the pore and a two-fold symmetry in the plane of the nuclear envelope. In addition, according to electron microscopic reconstruction model, NPC can also be considered schematically as a series of concentric cylinders. A peripheral cylinder coating the nuclear pore membrane contains a heptameric Nup84 complex, which harbors Nup145C/Sec13 complex in the center. Hence, X-ray crystallographic approach was employed to determine the Nup145C/Sec13 structure. Notably, in the two crystal forms I obtained, Nup145C/Sec13 oligmerized to form a slightly bent hetero-octamer rod. In the meantime, the oligomerization state could be observed in solution as well. Furthermore, as indicated by structural analyses, the interacting interfaces not only are evolutionarily conserved but also cover huge area. Taken together, the Nup145C/Sec13 hetero-octamer rod could be physiologically relevant without much doubt. In concordance with the stoichiometric considerations of NPC, then we confidently propose a model with respect to a coat for the nuclear pore membrane. In the model, the coat is constructed of four rings and each ring is composed of eight heptamers. Moreover, due to the three axes on the Nup145C/Sec13 rod, the hetero-octamer is also places vertically in order to connect these four anti-parallel rings. Remarkably, the Nup85/Seh1p crystal structures that were determined recently indicated that the assembly of this pair bears reseblance in its shape and dimension to that of another pair, Nup145C/Sec13. Thus, Nup85/Seh1 does form another hetero-octamer pole as we predicted in the model. Surprisingly, in contrast to the rigidity of the Nup145C/Sec13 hetero-octamer, the Nup85/Seh1 structures reveal a hinge motion that may facilitate the conformational change in the NPC for importing the integral membrane proteins