Search for single vector-like B quark production and decay via B → bH(b¯b) in pp collisions at √s = 13 TeV with the ATLAS detector

A search is presented for single production of a vector-like B quark decaying into a Standard Model b-quark and a Standard Model Higgs boson, which decays into a b¯b pair. The search is carried out in 139 fb−1 of √s = 13 TeV proton-proton collision data collected by the ATLAS detector at the LHC between 2015 and 2018. No significant deviation from the Standard Model background prediction is observed, and mass-dependent exclusion limits at the 95% confidence level are set on the resonance production cross-section in several theoretical scenarios determined by the couplings cW, cZ and cH between the B quark and the Standard Model W, Z and Higgs bosons, respectively. For a vector-like B occurring as an isospin singlet, the search excludes values of cW greater than 0.45 for a B resonance mass (mB) between 1.0 and 1.2 TeV. For 1.2 TeV < mB < 2.0 TeV, cW values larger than 0.50–0.65 are excluded. If the B occurs as part of a (B, Y) doublet, the smallest excluded cZ coupling values range between 0.3 and 0.5 across the investigated resonance mass range 1.0 TeV < mB < 2.0 TeV

Search for resonances decaying into photon pairs in 139 fb−1 of pp collisions at √s = 13 TeV with the ATLAS detector

Searches for new resonances in the diphoton final state, with spin 0 as predicted by theories with an extended Higgs sector and with spin 2 using a warped extra-dimension benchmark model, are presented using 139 fb−1 of √s = 13 TeV pp collision data collected by the ATLAS experiment at the LHC. No significant deviation from the Standard Model is observed and upper limits are placed on the production cross-section times branching ratio to two photons as a function of the resonance mass

A Novel Vertically Polarized Slotted Waveguide Array Antenna

The slot is a commonly used radiator in antenna systems. Slotted waveguide array antennas consist of a certain number of slots cut into the walls of a waveguide forming an array with the slots acting as individual radiating elements. These arrays provide high antenna efficiency, mechanical simplicity and robustness and high reliability. Here are presented simulated and measured results of a novel type of slotted waveguide antenna operating in X-band with vertical polarization.200711961Balanis, C.A., (2006) Antena Theory Analysis and Design, , Wiley-Intersciencewww.cst.comElliot, R.S., (2003) Antenna Theory and Design, , IEEE PressHarrington, R.F., (2001) Time-harmonic Electromagnetic Fields, , IEEE PressMailloux, R.J., Phased array antenna handbook (2006) Artech HouseMilligan, T.A., (1986) Modern Antenna Design, , McGraw- Hill Book CompanySilver, S., Microwave Antenna Theory and Design (1997) Peter Peregrinus Ltda