Conveners
Parallel Session V, Collider - Experiment
- Nadir Hashim (Kenyatta University)
- Shimaa AbuZeid (Ain Shams University - Egypt and INFN)
Many extensions to the Standard Model (SM) introduce a hidden or dark sector (DS) to provide candidates for dark matter in the universe and an explanation to astrophysical observations such as the positron excess observed in the cosmic radiation flux. This hidden sector could rise from an additional U(1)d gauge symmetry. ATLAS has searched for the gauge boson of the DS, which could be a...
We investigate the possibility of observing a havey Higgs boson ($H$) within the context of type-I 2 Higgs Doublet Model (2HDM). Our study is focused on $gg$ $\rightarrow{}$ $H \rightarrow{} hh \rightarrow{} b$$\bar{b}$ $ZZ \rightarrow{} b\bar{b}4\mu$ for $H$ production and decay. The study is done assuming a data-set of size 3000 $fb^{-1}$ of proton-proton collisions at $\surd s = 14$ TeV at...
The charged Higgs searches can be served to probe new physics at the LHC. In this study, we focus on the associated production of the charged Higgs boson with the bottom-quark and jet in 2HDM-type-I as a promising mode for a light H ± , i.e. m H ± < mt . We consider both situations where h(H) are the SM-like Higgs boson discovered with a mass near 125 GeV and investigate their bosonic decays,...
The measurement of the off-shell Higgs production and its decay width is performed in the Higgs decay channels of $ZZ\rightarrow 4\ell$ and $ZZ\rightarrow 2\ell2\nu$. The measurement uses Monte Carlo samples at a centre-of-mass energy of 13 TeV, produced according to the ATLAS detector configurations with an integrated luminosity of 139 fb$^{-1}$. The results are presented as an expected upper...
Parasitic collisions are proton-proton collisions that happen offset from the nominal ATLAS interaction point. With a 25 ns bunch spacing, the bunches can have parasitic encounters at z = n × 3.75 m, with n < 7. Using MC simulations, it would be possible to observe the distributions of key variables (from tracks and energy deposits) for such events at various distances. The task consisted of...
The Spin Physics Detector (SPD) is planned to run at the NICA collider that is currently under construction at JINR (Dubna). The main goal of SPD is to study the spin structure and other spin-related phenomena of the nucleon. SPD will operate with polarized proton-proton, deuteron-deuteron, and proton-deuteron collisions at energies up to $\sqrt{s} = 27$ GeV and luminosity up to $10^{32}$...
Machine learning techniques have been improving rapidly, and this has seen their
application grow within the high energy particle physics space. In this work, we propose the use of deep neural networks based on full supervised learning to search for heavy resonances at the electroweak scale with topological requirements. This study is carried out in both inclusive and exclusive regions of the...
The Standard Model (SM) of particle physics was completed by the discovery of the Higgs boson in 2012 by the ATLAS and CMS collaborations. However, the SM is not able to explain a number of phenomena and anomalies in the data. These discrepancies to the SM motivate the search for new bosons. In this paper, searches for new bosons are completed by looking for Zgamma resonances in Zgamma (pp > H...
A search for the $CP$-even scalar $H$ in a SM + real singlet scalar field $\phi_{H}$ model is presented. A proposed high energy Future Circular Hadron-Electron Collider (FCC - LheC) would provide sufficient energy in a clean environment to probe the heavy scalar $H$ resonance, $m_{H} \approx$ 270 GeV in deep inelastic scattering (DIS) charged current (CC) and neutral current (NC)...
In the search for new physics, beyond the standard model, the use of semi-supervised machine learning techniques provides a methodology to extract signal processes while minimizing potential biases caused by prior understanding. When using semi-supervised techniques in the training of machine learning models, over-training can lead to background events incorrectly being labeled as signal...
Search for resonant Higgs boson pair production, where one Higgs boson decays to bb and the other to WW, using the full Run 2 data of proton-proton collisions collected at a center-of-mass energy of 13 TeV with the ATLAS detector. The trilinear coupling leads to non-resonant pair production of Higgs bosons, where an off-shell Higgs decays to a pair of Higgs bosons. Physics beyond the SM can...
Astronomical and cosmological observations support the existence of invisible matter that can only be detected through its gravitational effects, thus making it very difficult to study. Dark matter (DM) makes up about 27% of the known universe. As a matter of fact, one of the main goals of the physics program of the experiments at the Large Hadron Collider of the CERN laboratory is the search...
