Majorana and pseudo-Dirac heavy neutrinos are introduced into the type-I inverse seesaw models, respectively, in explaining naturally small neutrino mass. TeV scale can also be accommodated to have a sizable mixing with Standard Model light neutrinos, through which they produced detected at high energy colliders. In this paper we consider Next-to-Leading Order QCD corrections production, study variation cross-sections as well kinematic distributions different final states 14 LHC context of...

We consider SUSY-like missing energy events at hadron colliders and critically examine the common assumption that is result of two identical particles. In order to experimentally test this hypothesis, we generalize subsystem M T2 variable case asymmetric event topologies, where SUSY decay chains terminate in different "children" more general approach, endpoint T2(max) distribution now gives mass $$ {\tilde M_p}\left( M_c^{(a)},\tilde M_c^{(b)}} \right) parent particles as a function input...

This paper seeks to demonstrate that many of the existing mass-measurement variables proposed for hadron colliders (${m}_{T}$, ${m}_{\mathrm{eff}}$, ${m}_{T2}$, missing ${\stackrel{\ensuremath{\rightarrow}}{p}}_{T}$, ${h}_{T}$, ${\sqrt{\stackrel{^}{s}}}_{\mathrm{min}}$, etc.) are far more closely related each other than is widely appreciated, and indeed can all be viewed as a common mass-bound specialized variety purposes. A consequence this one may understand better strengths weaknesses...

Hadronic signals of new-physics origin at the Large Hadron Collider can remain hidden within copiously produced hadronic jets. Unveiling such signatures require highly performant deep-learning algorithms. We construct a class Graph Neural Networks (GNN) in message-passing formalism that makes network output infra-red and collinear (IRC) safe, an important criterion satisfied perturbative QCD calculations. Including IRC safety as requirement construction GNN improves its explainability...

The model-independent theoretical upper bound on the thermal dark matter (DM) mass can be derived from maximum inelastic DM cross section featuring whole observed abundance. We deploy partial-wave unitarity of scattering matrix to derive maximal thermally averaged for general number-changing processes <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>r</a:mi><a:mo stretchy="false">→</a:mo><a:mn>2</a:mn></a:math> (with <d:math...

A bstract In this study, we critically evaluate the approximation capabilities of existing infra-red and collinear (IRC) safe feature extraction algorithms, namely Energy Flow Networks (EFNs) Energy-weighted Message Passing (EMPNs). Our analysis reveals that these algorithms fall short in extracting features from any N -point correlation isn’t a power two, based on complete basis IRC observables, specifically C-correlators. To address limitation, introduce Hypergraph (H-EMPNs), designed to...

We propose a new model-independent technique for mass measurements in missing energy events at hadron colliders. illustrate our method with the most challenging case of single-step decay chain. consider inclusive same-sign chargino pair production supersymmetry, followed by leptonic decays to sneutrinos...

To understand physics beyond the Standard Model (SM) it is important to have precise knowledge of Higgs boson and top quark masses as well strong coupling. Recently discovered new which likely be SM with mass 123-127 GeV has a submissive impact on stability standard model (BSM). The scenarios that include many scalar fields posses potential quartic couplings. Due complicated structures such potentials indeed difficult adjudge vacuum. Thus one needs formulate proper prescription for computing...

Anomaly detection through employing machine learning techniques has emerged as a novel powerful tool in the search for new physics beyond Standard Model. Historically similar to development of jet observables, theoretical consistency not always assumed central role fast algorithms and neural network architectures. In this work, we construct an infrared collinear safe autoencoder based on graph networks by energy-weighted message passing. We demonstrate that whilst approach theoretically...

A bstract The Inert Higgs Doublet model (IDM), assisted by Peccei-Quinn (PQ) symmetry, offers a simple but natural framework of dark sector that accommodates Weakly Interacting Massive Particle (WIMP) and axion as matter components. Spontaneous breaking U(1) PQ which was originally proposed an elegant solution to the strong charge-parity (CP) problem, also ensures stability WIMP through residual ℤ 2 symmetry. Interestingly, additional fields necessitated symmetry further enrich sector. These...

The precise knowledge of the Standard Model (SM) Higgs boson and top-quark masses couplings are crucial to understand physics beyond it. An SM-like having a mass in range 123--127 GeV squeezes parameters for Model. In recent LHC era many TeV-scale neutrino models have earned much attention as they pose interesting phenomenological aspects. We contemplated $B\ensuremath{-}L$ extended which theoretically well motivated phenomenologically interesting, successfully explain generation. this...

The existence of tiny neutrino masses and flavor mixings can be explained naturally in various seesaw models, many which typically having additional Majorana type SM gauge singlet right handed neutrinos ($N$). If they are at around the electroweak scale furnished with sizeable light active neutrinos, produced high energy colliders, such as Large Hadron Collider (LHC). A characteristic signature would same sign lepton pairs, violating number, together jets -- $pp\to N\ell^{\pm}, \;...

We examine the non-thermal production of dark matter in a scalar extended singlet doublet fermion model where lightest admixture fermions constitutes suitable candidate. The sector is non-minimal with MeV scale scalar, which stable Universe lifetime and can mediate self-interaction for multi-GeV mitigating small structure anomalies Universe. If strongly coupled, it undergoes internal thermal equilibrium after freeze-in production, we end up suppressed relic abundance radiation dominated In...

In this paper we consider the generation of naturally small neutrino masses from a dimension-7 operator. Such term can arise in presence scalar quadruplet and pair vectorlike fermion triplets enables one to obtain through TeV scale linear seesaw mechanism. We study phenomenology charged scalars model, particular, multilepton signatures at Large Hadron Collider. Of special importance is same-sign-tri-lepton originating triply scalars. The Standard Model background for such processes small,...

A weakly interacting massive particle (WIMP) provides an attractive dark matter candidate, and should be within reach of the next generation high-energy colliders. We consider process direct WIMP pair-production, accompanied by initial-state radiation photon, in electron–positron collisions at proposed International Linear Collider (ILC). present a parametrization differential cross section for this which conveniently separates model-independent information provided cosmology from...

The variable \sqrt{s}_{min} was originally proposed in arXiv:0812.1042 as a model-independent, global and fully inclusive measure of the new physics mass scale missing energy events at hadron colliders. In original incarnation \sqrt{s}_{min}, however, connection to blurred by effects underlying event, most notably initial state radiation multiple parton interactions. this paper we advertize two improved variants variable, which overcome problem. First show that evaluating RECO level, terms...

We explore the challenging but phenomenologically interesting hierarchical mass spectrum of Inert Doublet Model where relatively light dark matter along with much heavier scalar states can fully satisfy constraints on relic abundance and also fulfill other theoretical as well collider astrophysical bounds. To probe this region parameter space at LHC, we propose a signal process that combines up to two large radius boosted jets substantial missing transverse momentum. Aided by our intuitive...

A large part of the mSUGRA parameter space satisfying WMAP constraint on dark matter relic density corresponds to a higgsino LSP mass $\simeq 1$ TeV. We find promising signal for this at CLIC, particularly with polarized electron and positron beams. One also expects viable monochromatic $\gamma$-ray from its pair annihilation galactic center least cuspy DM halo profiles. All these results hold equally other SUSY models like non-universal scalar or gaugino so-called inverted hierarchy more...

Abstract We examine a scenario for freeze-in production of dark matter, which occurs due to the large thermal correction mass decaying mediator particle present in bath early Universe. show that decays, are kinematically forbidden otherwise, can open up at very high temperatures and dominate matter production. explore such minimal U(1) B-L model, comparing phenomenology context frozen-in with standard picture.

If coupled feebly to the Standard Model bath, dark matter can evade severe constraints from direct search experiments. At same time, such interactions help produce via freeze-in mechanism. The scenario becomes more interesting if one also includes thermal masses of different particles involved in phenomenology. Incorporating corrections opens up possibility production channels that remain kinematically disallowed standard setup. Motivated by this, we investigate a minimally extended...

We study the production of heavy neutrinos at Large Hadron Collider (LHC) through dominant s-channel mode as well vector boson fusion (VBF) process. consider TeV scale minimal linear seesaw model containing two singlets with opposite lepton number. This is fully reconstructible from oscillation data apart an overall normalization constant which can be constrained meta-stability electroweak vacuum and bounds coming flavor violation (LFV) searches. Dirac nature in this implies suppression...