AION/Magis

Research group

Research theme

Sub department

About

Radiation hard monolithic CMOS sensors with small electrodes for High Luminosity LHC

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 986 (2020) ARTN 164381

Authors:

H Pernegger, P Allport, I Asensi Tortajada, M Barbero, P Barrillon, I Berdalovic, C Bespin, S Bhat, D Bortoletto, P Breugnon, C Buttar, R Cardella, F Dachs, V Dao, Y Degerli, H Denizli, M Dyndal, L Flores Sanz de Acedo, P Freeman, L Gonella, A Habib, T Hemperek, T Hironoi, B Hiti, T Kugathasan, I Mandic, M Mikuz, K Moustakas, M Munker, KY Oyulmaz, P Pangaud, F Piro, P Riedler, H Sandaker, EJ Schioppa, P Schwemling, A Sharma, L Simon Argemi, C Solans Sanchez, W Snoeys, T Suligoj, T Wang, N Wermes

Fourier transform detection of weak optical transitions with cyclic routines

(2020)

Authors:

Jesse S Schelfhout, Lilani D Toms-Hardman, John J McFerran

Reproductive freeze-in of self-interacting dark matter

Physical Review D American Physical Society 102:8 (2020) 83018

Authors:

John March-Russell, Hannah Tillim, Stephen M West

Abstract:

We present a mechanism for dark matter (DM) production involving a self-interacting sector that at early times is ultrarelativistic but far underpopulated relative to thermal equilibrium (such initial conditions often arise, e.g., from inflaton decay). Although elastic scatterings can establish kinetic equilibrium we show that for a broad variety of self-interactions full equilibrium is never established despite the DM yield significantly evolving due to 2→k (k>2) processes (the DM carries no conserved quantum number nor asymmetry). During the active phase of the process, the DM to Standard Model temperature ratio falls rapidly, with DM kinetic energy being converted to DM mass, the inverse of the recently discussed “cannibal DM mechanism.” As this evolution is an approach from an out-of-equilibrium to equilibrium state, entropy is not conserved. Potential observables and applications include self-interacting DM signatures in galaxies and clusters, dark acoustic oscillations, the alteration of free-streaming constraints, and possible easing of σ8 and Hubble tensions.

Search for dark matter produced in association with a dark Higgs boson decaying into $W^\pm W^\mp$ or $ZZ$ in fully hadronic final states from $\sqrt{s}=13$ TeV $pp$ collisions recorded with the ATLAS detector

ArXiv 2010.06548 (2020)

Search for new phenomena in final states with large jet multiplicities and missing transverse momentum using (√s)=13 TeV proton−proton collisions recorded by ATLAS in Run 2 of the LHC

Journal of High Energy Physics Springer 2020 (2020) 62

Abstract:

Results of a search for new particles decaying into eight or more jets and moderate missing transverse momentum are presented. The analysis uses 139 fb−1 of proton-proton collision data at 𝑠√ = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018. The selection rejects events containing isolated electrons or muons, and makes requirements according to the number of b-tagged jets and the scalar sum of masses of large-radius jets. The search extends previous analyses both in using a larger dataset and by employing improved jet and missing transverse momentum reconstruction methods which more cleanly separate signal from background processes. No evidence for physics beyond the Standard Model is found. The results are interpreted in the context of supersymmetry-inspired simplified models, significantly extending the limits on the gluino mass in those models. In particular, limits on the gluino mass are set at 2 TeV when the lightest neutralino is nearly massless in a model assuming a two-step cascade decay via the lightest chargino and second-lightest neutralino.