Conveners
Beyond the Standard Model - Posters: Block I
- Iurii Karpenko (Czech Technical University in Prague)
Beyond the Standard Model - Posters: Block II
- Iurii Karpenko (Czech Technical University in Prague)
Beyond the Standard Model - Posters: Block III
- Iurii Karpenko (Czech Technical University in Prague)
New resonances decaying into pairs of quarks or gluons appear in a variety of new physics models from simple gauge extensions of the standard model to Grand Unified Theories. The dijet final state at high transverse momentum can probe the highest energies reached in a collider experiment. This corresponds to the largest reach in mass for the production of new particles. Some BSM particles may...
This poster presents a search for pair-produced scalar leptoquarks decaying to leptons and hadronic top quarks using 139 fb-1 of data recorded by the ATLAS detector at √s = 13 TeV. As well as being predicted by various extensions of the Standard Model to describe the similarity between the quark and lepton sectors, leptoquarks provide a promising explanation for anomalies observed in both the...
Compositeness models are a popular explanation for the observed three generations of standard model (SM) particles. One consequence of compositeness would be the observation of excited leptons, such as excited electrons, e, or excited muons, mu. At the LHC such particles could be produced in pp collisions under the assumption that leptons are composite objects. Produced excited leptons are...
Ultraperipheral lead-lead collisions at $\sqrt{s_{NN}} = 5.02$ TeV produce such very large photon fluxes that the fundamental, and very rare, quantum-mechanical process of Light-by-light (LbyL) scattering can be observed. The studies of LbyL scattering in ultraperipheral PbPb collisions data collected during the 2015 and 2018 LHC runs will be presented, using samples corresponding to...
The Model Unspecific Search in CMS (MUSiC) analysis searches for anomalies in data that can be probed for new physics phenomena based purely on the comparison of the recorded data to the expectation according to the standard model (SM), obtained from simulations. Events selected with at least one lepton are classified into several hundred event classes based on their final state topology,...
We discuss the CP-violating effects at partonic level arising due to anomalous Wtb vertices at the Large Hadron Collider in the semileptonic decay modes of the top-quark for the ttbar events at the LHC. Limits on these anomalous couplings are also discussed for the 13 TeV LHC energy run. The improvements over these estimates for the forthcoming HL-LHC with 14 and 27 TeV and FCC-hh with 100...
Electroweak production of supersymmetric particles becomes relevant whenever strongly coupled SUSY is present only at relatively high masses. Due to the strict constraints in squark and gluino properties obtained at the LHC experiments, low mass sleptons and/or gauginos could dominate SUSY production at LHC. A search for supersymmetric particles in multileptonic final states using data...
A search for supersymmetry involving the pair production of gluinos decaying via third generation squarks into the lightest neutralino is performed. The final state contains large missing transverse momentum, leptons, and several energetic jets (including at least three b-tagged jets). This poster summarizes the recent ATLAS result on this search which was performed with LHC pp collision data...
The non-diagonal correlator of vector and tensor fermionic currents is considered as the concrete example of the two-point one-loop amplitudes modified by a constant homogeneous magnetic field. The crossed-field limit of this correlator is found. The tensor current is a fermionic part of the Pauli Lagrangian relevant for the electromagnetic interaction of fermions through the anomalous...
Vector like quarks (VLQs) are hypothetical spin-1/2 particles of the fourth generation that have left- and right-handed components. They are postulated to solve the hierarchy problem and stabilize the Higgs mass, while escaping constraints on the Higgs cross section measurement. The poster will present of the current status of the search for VLQs (T`) decaying to a top quark and a Higgs boson...
The discovery of neutrino oscillations implies they have non-null masses much smaller than charged leptons. This is difficult to accommodate in a natural way through a pure Standard Model Yukawa coupling to the Higgs field. Type-III SeeSaw mechanism is a proposed beyond the SM model, introducing at least two new triplets of fermionic fields with zero hypercharge in the adjoint representation...
Proton Decay is one of the apparent consequences of Baryon Number Violation, which has been predicted in many Grand Unified Theories. It would become an explanation to the asymmetry of matter and anti-matter in the universe. Many experiments have been contributing to search for this rare but key sign of new physics. Among them, SuperK has acquired the best result. On the channel p to ν and K+,...
Within the context of a $U(1)_{B-L}$ model, we develop and present novel analytical formulas to assess the effects of the anomalous magnetic moment and electric dipole moment of the tau-neutrino on the stellar energy loss rates through some common physical process of pair-annihilation $e^+e^- \to (\gamma, Z, Z') \to \nu \bar\nu$. Our results show that the stellar energy loss rates strongly...
The discovery of a 125 GeV Higgs-boson and no other (under TeV) new resonance yet at the Large Hadron Collider poses a major challenge for the minimal supersymmetric standard model (MSSM). We present our search with the assistance of information theory and the prior experimental data, to find out the “finely-tuned” CMSSM under the aforesaid circumstances along with the dark-matter experiment.
We estimate the new physics contributions to the calculation of muon anomalous magnetic moment, $a_{\mu}= \frac{g_{\mu}-2}{2}$ in
a $U(1)_{L_\mu-L_\tau}$ extension of left-right symmetric model based on the gauge group $SU(2)_L\times SU(2)_R\times U(1)_{B-L}\times SU(3)_C\times U(1)_{L_\mu-L_\tau}$.
The gauged $U(1)_{L_\mu-L_\tau}$ symmetry helps in realising low-scale inverse seesaw...
We investigate the effect of CP violation in the Higgs sector of the U(1)′-extended MSSM. We are particularly interested in the mass and decay dependence of the second lightest neutral Higgs boson, in the presence of CP violating phases for $\mu_{eff}$. The masses of the neutral Higgs bosons are calculated at the one-loop level by taking into account the contributions from top and bottom...
A search for scalar top quark pair production at the LHC is presented. This search targets a region of parameter space where the kinematics of top squark pair production and top quark pair production are very similar, because of the mass difference between the top squark and the neutralino being close to the top quark mass. The search is performed with the full run 2 data set of proton-proton...
Motivated by the stringy effects by modifying the local kinetic term of the Higgs field by the Gaussian kinetic term we show that the Higgs field does not possess any instability, the Yukawa coupling between the scalar and the fermion, the gauge coupling, and the self interaction of the Higgs yields exponentially suppressed running at high energies, showing that such class of theory never...
In order to simultaneously account for both $R_{D^{(\ast)}}$ and
$R_{K^{(\ast)}}$ anomalies in $B$-decays, we consider an extension
of the Standard Model by a single vector leptoquark field, and study
how one can achieve the required lepton flavour non-universality,
starting from a priori universal gauge couplings. While the unitary
quark-lepton mixing induced by $SU(2)_L$...
Assuming that the degrees of freedom of a black hole are finite in number and of fermionic nature, we naturally obtain, within a second-quantized toy model of the evaporation, that the Bekenstein bound is a consequence of the Pauli exclusion principle for these fundamental degrees of freedom. We show that entanglement, Bekenstein and thermodynamic entropies of the black hole all stem from the...
