Matching fixed order calculations with parton showers enables us to predict jet observables over a wide kinematic range, combining the precision of the fixed order cross section at hand with the parton shower's abilty to resum logarithms in regions where a fixed order cross section would loose its predictive power.
In this lightning talk I would introduce the basic building blocks of the...
We are trying to investigate how to extract particles' properties, such as colour charge and spin, and use them to improve the jet clustering, as the standard models use only kinematics variables. At the moment, we are looking at two different events, $pp \rightarrow gZ \rightarrow b\bar{b}e{e}$ and $pp \rightarrow HZ \rightarrow b\bar{b}e{e}$, in order to find a way to use the differences...
We present H1jet, a fast code that computes the total cross section and differential distribution in the transverse momentum of a colour singlet. In its current version, the program implements only leading-order 2 → 1 and 2 → 2 processes, but could be extended to higher orders. We discuss the processes implemented in H1jet, give detailed instructions on how to implement new processes, and...
We assess the performance of different jet-clustering algorithms, in the presence of different resolution parameters and reconstruction procedures, in resolving fully hadronic final states emerging from the chain decay of the discovered Higgs boson into pairs of new identical Higgs states, the latter in turn decaying into bottom antibottom quark pairs. We show that, at the LHC, to select a...
Using the kappa formulation for the coupling strengths of the five higgses to quarks and W bosons we aim to construct a toolbox to work alongside MadGraph that will enable the user to scan over various variables including the titular kappas and calculate the cross-sections at each of these parameter points. In doing this we can highlight regions with large excess compared to the SM that would...
We study an extended 2 Higgs doublet model (2HDM) in which the Standard Model (SM) Yukawa interactions are forbidden due to a global U(1)' symmetry, but may arise via mixing with vectorlike families. In this model, the hierarchical structure of Yukawa couplings of quarks and leptons in the SM arises from the heavy masses of the fourth and fifth vectorlike families. Within this model, we...
We consider an explicit effective field theory example based on the Bousso-Polchinski framework with a large number N of hidden sectors contributing to supersymmetry breaking. Each contribution comes from four form quantized fluxes, multiplied by random couplings. The soft terms in the observable sector in this case become random variables, with mean values and standard deviations which are...
Neutrinoless double-beta decay is a unique probe of BSM physics, owing to its sensitivity to both the neutrino mass scale and the proposed Majorana nature of neutrinos. In this research, we explore the Bayesian inference of constraints on neutrino mass and Majorana phases via Markov-Chain Monte Carlo (MCMC) methods. In particular we study the role that prior assumptions play in inference by...
NOvA is a long-baseline, two-detector, accelerator-based neutrino experiment at FERMILAB. It studies neutrino properties which are too complicated to be directly extracted from data, therefore needing to compare the data to a simulation as close to the real world as possible. The basis of this simulation is the prediction of the neutrino beam, which in NOvA's case is created by colliding...
Neutrino oscillation implies the neutrino is massive which means the Standard Model(SM) need to be extended. Supersymmetry(SUSY) is one of the most studied frameworks to construct beyond the SM model. The advantage of SUSY model is sneutrino, the superpartner of neutrino, can decay visibly in collider in some case. It gives chance to study neutrino dynamics at collider. The minimal...
For the High-Luminosity LHC (HL-LHC) expected in 2025 the CMS detector will be modified.
The upgrade of the tracker will enable tracks to be reconstructed in time for their use in the level 1 trigger.
I am exploring the effectiveness of a simple algorithm (that could be applied in HL-LHC) that will be able to take the track Z position resolution into account as a function of track pseudorapidity.
Since the first positive measurement of the Λ-hyperon global spin polarization in heavy-ion collisions by STAR in 2017, the understanding of the nature of this phenomenon is one of the most intriguing challenges for the community. As relativistic fluid dynamics celebrates multiple successes in describing collective dynamics of the QCD matter in such reactions, the natural question arises...
Expanding previous ATLAS analysis at lower energies, the high mass DY analysis aims to study the single- and double-differential cross section of the Drell-Yan production of dileptons in the range m_{ll}>116 GeV, exploring a phase space crucial to set constraints on the parton distribution functions (PDFs), covering a wide range of the proton’s momentum fraction.
The large dilepton...
Limitations on the most general mono-X Dark Matter signature at colliders motivate searches beyond this, such as multilepton plus missing energy signatures. In this talk I present our latest limits on the inert 2-Higgs Doublet model (I2HDM) and Minimal Fermion Dark Matter model (MFDM) for 8/13 TeV pp collisions at the LHC, producing 2-3 leptons plus missing energy final states, using...
In this talk, I will briefly introduce the asymptotic-safety paradigm in quantum gravity. As an application, I will explore scalar-gravity systems to show the constraining power of asymptotic safety: the strength of the gravitational fluctuations should not exceed a critical value otherwise they generate complex fixed-point values in higher-order scalar interactions. On the other hand, within...
In this talk we present a new approach called Local Analytic Sector subtraction, recently proposed in Turin, which aims to efficiently tackled the problem of the cancellation of infrared singularities in order to perform multi-parton NLO (and beyond) QCD calculations.
The actual cancellation is basically achieved subtracting from the real radiation scattering amplitude simple counterterms...
I shall discuss the new method that Andrea Banfi, Basem El-Menoufi and myself have been working on to compute leading hadronisation corrections to two-jet event shapes in $e^+e^-$ annihilation.
In our work we study the cosmological phase transition (PT) in a conformal extension of the Standard Model (SM). The model considered is called SU(2)cSM, it extends the SM gauge group by an additional hidden SU(2)$_X$ gauge group, and a scalar doublet (whilist singlet under SM gauge group). The tree-level potential has no mass terms, all the masses are generated via the Coleman-Weinberg...
In this talk, I will briefly discuss my current research on dark matter based on $SU(2)_D$ gauge group. The stability of the dark matter sector is required by the new gauge group. Two new scalar multiplets are introduced to give mass to SM particles and new gauge bosons. In this scenario, there are three possible dark matter in the model. The phenomenology study of this model needs further...
We study the process qq, gg → A → Z ∗h in a 2-Higgs Doublet Model Type-II where the mass of the CP-odd Higgs state A is lower than the rest mass of the Z and h particles (the latter being the Standard Model-like Higgs state discovered at the Large Hadron Collider in 2012), i.e., mA < mZ +mh ≈ 215 GeV. This is a mass range which is not being currently tested by ATLAS and CMS, yet we show that...
The CMB anisotropies are an incredibly accurate probe of the ionisation history of our universe. Sources of energy injection into the intergalactic medium (IGM) act to dampen the CMB signal and can give insight into the processes that lead to the reionization of our universe. Typically, the epoch of reionization is attributed to energy injection from early star formation. Other sources of...