Interpreting The 750 GeV Diphoton Excess Within Topflavor Seesaw Model

We propose to interpret the 750 GeV diphoton excess in a typical topflavor seesaw model. The new resonance X can be identified as a CP-even scalar emerging from a certain bi-doublet Higgs field. Such a scalar can couple to charged scalars, fermions as well as heavy gauge bosons predicted by the model, and consequently all of the particles contribute to the diphoton decay mode of the X. Numerical analysis indicates that the model can predict the central value of the diphoton excess without contradicting any constraints from 8 TeV LHC, and among the constraints, the tightest one comes from the Z \gamma channel, \sigma_{8 {\rm TeV}}^{Z \gamma} \lesssim 3.6 {\rm fb}, which requires \sigma_{13 {\rm TeV}}^{\gamma \gamma} \lesssim 6 {\rm fb} in most of the favored parameter space.Comment: Major changes, 17 pages, 4 figure, typos corrected, calculation details adde

Post-experiment coincidence counting method for coincidence detection techniques

Recently, two coincidence detection techniques, the coincidence angle-resolved photoemission spectroscopy (cARPES) and the coincidence inelastic neutron scattering (cINS), have been proposed to detect directly the two-body correlations of strongly correlated electrons in particle-particle channel or two-spin channel. In the original proposals, there is a coincidence detector which records the coincidence probability of two photoelectric processes or two neutron-scattering processes. In this article, we present a {\it post-experiment} coincidence counting method for the proposed coincidence detection techniques without a coincidence detector. It requires a time-resolved {\it pulse} photon or neutron source. Suppose $I_{d_1}^{(1)}$ records the emitted photoelectron or the scattered neutron arrived at the detector $D_1$ and similarly $I_{d_2}^{(1)}$ records the counting arrived at the detector $D_2$ within one time window between sequential two incident pulses. The coincidence counting can be defined by $I_d^{(2)}=I_{d_1}^{(1)} \times I_{d_2}^{(1)}$, which records the coincidence probability of two photoelectric processes or two neutron-scattering processes within this time window. Therefore, $I_d^{(2)}$ involves the two-body correlations of the target electrons. The previously proposed cARPES and cINS can be implemented upon the time-resolved angle-resolved photoemission spectroscopy (ARPES) and inelastic neutron scattering (INS) experimental apparatuses with pulse sources.Comment: 5 pages, 1 figur