Conveners
Poster pitch
- Seyda Ipek (University of Washington)
- Samuel Ross Meehan (CERN)
The LHC offers the best prospects for direct production of WIMP Dark Matter (DM) and gauge bosons arising from a dark sector beyond the Standard Model (SM). In particular, a neutral Z’{DM} boson mediating DM-SM interactions is a prime target for resonance searches, and its couplings can thereby be constrained within the broad context of mediator-based simplified DM models. In this poster I...
Abstract: Dark matter models predict the production of weakly interacting massive particles (WIMPs) in proton-proton collisions. Many of these theories are tested at the LHC using the ATLAS detector, in which events are characterised by large missing transverse momentum carried by a dark matter particle-antiparticle pair. These models predict that the dark matter pair may be produced via a new...
One of the ways to look for evidence of dark matter (DM) at a collider experiment is through s-channel processes where a DM mediator decays to two quarks. At ATLAS, analyses looking for di-jet resonances are limited to mediator masses above a TeV, due to the high transverse momentum (pT) requirements of jet triggers. However, sub-TeV mass regions can be explored if the resonance is produced...
A RECAST of an existing ATLAS analysis is used to perform a search for dark matter produced in association with a dark Higgs boson decaying to two b-quarks from pp collisions at a centre-of-mass energy of sqrt(s) = 13 TeV. RECAST is an analysis reinterpretation framework; since analyses are often sensitive to a range of models, RECAST can be used to constrain the plethora of dark matter models...
A search for new resonances decaying into two hadronic jets is reported using the entire dataset of proton-proton collisions recorded at sqrt(s) = 13 TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb−1. The dijet invariant mass distribution is compared to a smoothly-falling background prediction obtained by...
A search for dark matter produced in association with a Higgs boson decaying to a bottom quark-antiquark pair is performed in proton-proton collisions at a center-of-mass energy of 13 TeV collected with the CMS detector at the LHC. The analyzed data sample corresponds to an integrated luminosity of 35.9 fb-1. The signal is characterized by a large missing transverse momentum recoiling against...
Probing the energy frontier with increasingly large particle colliders has culminated at the beginning of the current decade with the discovery of the Higgs boson, the final particle predicted by the Standard Model of particle physics. Nevertheless, the energy frontier program has so far failed to find any particles of the dark sector comprising the 95% of the Universe’s energy density not...
The SHiP Collaboration has proposed a general-purpose experimental facility operating in beam dump mode at the CERN SPS accelerator with the aim of searching for light, long-lived exotic particles of Hidden Sector models. The SHiP experiment incorporates a muon shield based on magnetic sweeping and two complementary apparatuses. The detector immediately downstream of the muon shield is...
Based on a benchmark Hidden Sector model, this analysis explores the possibility of new physics being present at the LHC through long-lived particles. Given that the lifetime of these particles is mostly unconstrained, this raises the possibility of these particles decaying before they leave ATLAS detector. The specific scenario of two of these long-lived particles decaying to standard model...
In R-parity conserving supersymmetric extensions of the standard model, the lightest neutralino $\tilde{\chi}_{1}^{0}$, which is also the lightest supersymmetric particle (LSP), plays the role of the canonical dark matter particle candidate. The traditional $\tilde{\chi}_{1}^{0}$ searches using Drell-Yan processes suffer in the compressed spectrum scenarios, where the LSP mass is only slightly...
Long-lived particles (LLPs) are a feature of many theories beyond the Standard Model and would be generically produced in exotic decays of the Higgs boson. No known search strategy with current experiments will be able to observe the decay of neutral LLPs with masses above $\sim 1\ \mathrm{GeV}$ at lifetimes near the upper limit of $c\tau \sim 10^7\ \mathrm{m}$ set by effects on Big Bang...
CP violation has been observed in neutral meson oscillations, which may explain the matter-antimatter asymmetry of the Universe. We found that a supersymmetric theory with an unbroken U(1)R symmetry and Dirac gauginos can accommodate baryogenesis and asymmetric sneutrino dark matter production via B meson oscillations. This model can be tested via semileptonic asymmetries of B mesons, Flavor...
The total decay width of the Higgs has not yet been constrained precisely, which allows for up to 30% of the branching fraction to be from beyond the standard model decays. If sufficiently light, dark matter motivates a decay of the Higgs to invisible final states. This talk will discuss searches for invisible decays of the Higgs produced in all production modes in pp collisions at √s= 13 TeV...
