The individual fermion generations of the Standard Model fit neatly into a representation of a simple Grand Unified Theory gauge algebra. If Grand Unification is not realised in nature, this would appear to be a coincidence. We attempt to quantify how frequent this coincidence is among theories with group structure and fermion content similar to the Standard Model. While not constituting...
I will discuss an agnostic, model-independent analysis of baryon number violation using the power of Effective Field Theory. In my presentation, I show the contribution of dimension six and seven effective operators to ∣Δ(B−L)∣=0, 2 nucleon decays taking into account the effects of Renormalisation Group Evolution and we will find lower limits on the energy scale of each operator and...
I will start by explaining why it is interesting and how one can quantise from first principles field theories living on the background of a bubble wall in the planar limit, i.e. a domain wall, with a particular focus on the case of spontaneous breaking of gauge symmetry. Using the tools we introduced, we can compute the average momentum transfer from transition radiation, which denotes the...
Quantum entanglement is a fundamental property of quantum mechanics. Recently, studies have explored entanglement in the top-anti-top system at the Large Hadron Collider (LHC) when both the top quark and anti-top quark decay leptonically. Entanglement is detected via correlations between the polarizations of the top and anti-top and these polarizations are measured through the angles of the...
Many theories beyond the Standard Model predict new phenomena, such as heavy vectors or scalar, vector-like quarks, and leptoquarks in final states containing bottom or top quarks. Such final states offer great potential to reduce the Standard Model background, although with significant challenges in reconstructing and identifying the decay products and modelling the remaining background. The...
Searches for anomalous neutral triple gauge boson couplings (NTGCs) provide important tests for the gauge structure of the standard model. In SMEFT NTGCs appear at the level of dimension-8 operators. We point out that the complete matching of UV models requires four different CP-conserving $d=8$ operators and that the single CPC $d=8$ operator, most commonly used by the experimental...
We discuss heavy particles that can be used to pin down the faithful Standard Model (SM) gauge group and their patterns in the SM effective field theory (SMEFT). These heavy particles are not invariant under a specific Z6 subgroup of SU(3)c ×SU(2)L ×U(1)Y, which however acts trivially on all the SM particles, hence the faithful SM gauge group remains undetermined. Different realizations of the...
Composite Higgs models with a fermionic UV completion predict unusual top partners and an extended scalar sector. We present a particular model which predicts color octet and color neutral fermions as as a color triplet scalar. This model has an additional `baryon' number implying the stability of the lightest resonance which can serve as a dark matter candidate. We discuss the LHC...
Many different theories beyond the Standard Model (SM) predict that new physics will manifest itself by decaying into final states involving leptons. Leptoquarks are predicted by many new physics theories to describe the similarities between the lepton and quark sectors of the SM. Right-handed Ws and heavy-neutrinos are also predicted by many extensions of the SM in the gauge sector, and...
Long-range angular correlations among particles may uncover physics
beyond the Standard Model, such as Hidden Valley (HV) scenarios. We particularly investigate a QCD-like sector, where HV matter coupled with QCD partonic cascades, may enhance azimuthal correlations among final-state particles. Our examination at the detector level concentrates on discerning these signals at future e+e-...
We discuss the experimental prospects for measuring differential observables in b-quark and c-quark pair production at the International Linear Collider (ILC) baseline energies, 250 and 500 GeV. The study is based on full simulation and reconstruction of the International Large Detector (ILD) concept. Two gauge-Higgs unification models predicting new high-mass resonances beyond the Standard...
We examine the detection prospects of new Standard Model (SM)-neutral vector bosons (Z′) that couple exclusively to leptons at the Future Circular Collider (FCC-ee), by performing parton level and detector level analyses. We show that FCC-ee can significantly extend the unprobed parameter space in the kinematically allowed mass range, and competes with other proposed lepton collider options...
FlexibleSUSY is a framework for automating computations of physical quantities in BSM theories. We show an extension of FlexibleSUSY which allows us to define and add new observables. The extension has already been used to include Charged Lepton Flavor Violation (CLFV) observables and now further observables can be added straightforwardly.
The talk is split into two parts. We explain how to...
We develop a numerical technique for the optimal extraction of the new physics (NP) couplings applicable to any collider process, without any simplifying assumption. This approach also provides a way to compare with the NP estimates derived using standard $\chi^2$ analysis and can be used to gauge the advantages of various modalities of collider design, such as centre of mass energy, beam...
Various theories beyond the Standard Model predict new, long-lived particles with unique signatures which are difficult to reconstruct and for which estimating the background rates is also a challenge. Signatures from displaced and/or delayed decays anywhere from the inner detector to the muon spectrometer, as well as those of new particles with fractional or multiple values of the charge of...
Many models beyond the standard model predict new particles with long lifetimes. These long-lived particles (LLPs) decay significantly displaced from their initial production vertex thus giving rise to non-conventional signatures in the detector. Dedicated data streams and innovative usage of the CMS detector boost are exploited in this context to significantly boost the sensitivity of such...
The MoEDAL-MAPP experiment at the LHC is designed to search for Highly Ionizing Particle (HIPs) such as magnetic monopoles and massive (meta)stable electrically charged particles. The main passive elements of the MoEDAL detector do not require a trigger system, electronic readout, or online computerized DAQ. Also, the detector is immune to standard model backgrounds that can mimic signal...
High-Electric-Charge Objects (HECOs) are featured in numerous theoretical particle physics models extending beyond the Standard Model.
HECOs are actively pursued in contemporary collider experiments like the LHC. In these searches, the determination of mass limits for HECOs has relied on Drell-Yan and Photon-Fusion processes at the tree level thus far. However, these approximations lack...
Many theories beyond the Standard Model predict new phenomena giving rise to multijet final states. These jets could originate from the decay of a heavy resonance into SM quarks or gluons, or from more complicated decay chains involving additional resonances that decay e.g. into leptons. Also of interest are resonant and non-resonant hadronic final states with jets originating from a dark...
Axion-like particles (ALPs) are expected to arise in a wide variety of models, whenever a global symmetry is spontaneously broken. Although they can produce a rich phenomenology, they typically need to be supplemented by extra new physics in order to explain neutrino masses. In this talk, we will discuss the interplay of axion-like particles and heavy neutral leptons in a collider setting,...
The MoEDAL-MAPP experiment is currently installing the MAPP-1 (MoEDAL Apparatus for Penetrating Particles, Phase-1) in the UA83 tunnel on the LHC ring to search for evidence of Weakly Ionizing Particles (WIPs) , such as millicharged particles. MAPP-2 will be deployed in during the LHC’s next long shutdown to take data along with MoEDAL and MAPP-1 at the High Luminosity LHC. MAPP-2 is designed...
The proposed LUXE experiment (LASER Und XFEL Experiment) at DESY, Hamburg, using the electron beam from the European XFEL, aims to probe QED in the non-perturbative regime created in collisions between high-intensity laser pulses and high-energy electron or photon beams. This setup also provides a unique opportunity to probe physics beyond the standard model. In this talk we show that by...
