Model-independent sensitivity estimates for the electromagnetic dipole
moments of the **top** **quark** at the Large Hadron Collider and beyond

**top**

**quark**ensures testing of the Standard Model and occupies a significant role in a lot of theories of new physics beyond the Standard Model. Up to now, the

**top**

**quark**has been only generated at the Tevatron and the Large Hadron Collider. However, one of the most important tasks of the physics program at the Large Hadron Collider is the investigation of the anomalous

**top**

**quark**interactions. In addition, the production of single

**top**quarks, though rarer than production in pairs, presents us a different way to study the

**top**

**quark**produced via the electroweak interaction. This makes single

**top**

**quark**production an important signature for studying the properties of the

**top**

**quark**. Hence, we examine the anomalous $t\bar{t}\gamma$ interactions to investigate limits on the anomalous $a_A$ and $a_V$ couplings through single

**top**

**quark**production of the process $pp\rightarrow p \gamma^{*} p \rightarrow p t W X$ at the Large Hadron Collider, the High Luminosity Large Hadron Collider and High Energy Large Hadron Collider. The best limits obtained on the anomalous $a_A$ and $a_V$ couplings through the subprocess $\gamma^{*} b \rightarrow W t$ at the High Energy Large Hadron Collider with $L_{int}=15$ ab$^{-1}$ at $68\%$ Confidence Level are found to be $|a_{A}|=0.0590$ and $a_{V}=[-0.3202;0.0108]$. Therefore, we understand that $\gamma^{*} p$ collisions at the High Energy Large Hadron Collider improves the sensitivity limits of the anomalous coupling parameters according to previous studies.

10/10 relevant

arXiv

**Top** **Quark** Mixed Hybrid Meson and the Quark-Gluon Plasma

**top**

**quark**mesons and possible detection of the creation of the Quark-Gluon Plasma via Relativistic Heavy Ion Collisions. Expand abstract.

**top**

**quark**meson state with a hybrid admixture. This new estimate uses the previous estimates of hybrid charmonium and upsilon states, but with the mass of the

**top**

**quark**mass being much greater than the charm and bottom

**quark**masses. We discuss production of mixed hybrid

**top**

**quark**mesons and possible detection of the creation of the

**Quark**-Gluon Plasma via Relativistic Heavy Ion Collisions.

10/10 relevant

arXiv

Modified interactions in the **top**-**quark** electroweak sector: exploiting
unitarity violating effects at the amplitude level to probe New Physics

**top**

**quarks**in the Electroweak sector. We parametrise the modified interactions using the Standard Model Effective Field Theory framework and discuss how the New Physics effects lead to unitarity violating behaviour at the amplitude level. For each scattering amplitude we compute the helicity amplitudes in the high energy limit paying special attention to the effects of the higher dimensional operators. We also discuss whether and to what extent the unitarity violating effects are retained in physical processes at colliders.

9/10 relevant

arXiv

The EFT and FCNC interpretations in the processes with **top** **quarks** at CMS

**top**

**quarks**are presented. Expand abstract.

**top**

**quarks**are sensitive to several classes of EFT operators including the flavour-changing neutral currents (FCNC). The summary of the latest CMS results based on the recent studies of the standard model processes and searches for new physics effects involving

**top**

**quarks**are presented.

10/10 relevant

arXiv

Gluino Search with Stop and **Top** in Nonuniversal Gaugino Mass Models at
LHC and Future Colliders

**top**quarks, $\tilde{g}\rightarrow \tilde{t}_{1}t$ and $\tilde{g}\rightarrow \bar{t}t\tilde{\chi}_{1}^{0}$, where $\tilde{t}_{1}t$ represents both $\tilde{t}_{1}\bar{t}$ and $\tilde{t}_{1}^{*}t$. The region with $m_{\tilde{g}} \lesssim 2$ TeV is excluded up to $68\%$ CL in the CMSSM if the gluino decays into a stop and

**top**quark, while the $95\%$ CL exclusion requires $m_{\tilde{g}}\gtrsim 1.9$ TeV. Such exclusion bounds on the gluino mass more or less overlap with the current LHC results. The decay mode $\tilde{g}\rightarrow \bar{t}t\tilde{\chi}_{1}^{0}$ may take over if $\tilde{g}\rightarrow \tilde{t}_{1}t$ is not allowed. One can probe the gluino mass in this case up to about 1.5 TeV with $68\%$ CL in the CMSSM, and about 1.4 TeV with $95\%$ CL. A similar analyses in the NUGM framework yield exclusion curves for the gluino mass $m_{\tilde{g}}\gtrsim 2.1$ TeV at 14 TeV for both decay modes of the gluino under consideration. We also show that increasing the center of mass energy to 27 TeV can probe the gluino mass up to about 3 TeV through its decay mode into stop and

**top**

**quark**. The Dark Matter constraints are not very severe in the framework of NUGM, and they allow solutions with $m_{\tilde{g}},m_{\tilde{t}} \gtrsim 1$ TeV. In addition, with NUGM the LSP neutralino can coannihilate with gluino and/or stop for $m_{\tilde{g}},m_{\tilde{t}}\approx m_{\tilde{\chi}_{1}^{0}} \in [0.9-1.5]$ TeV. The 100 TeV FCC collider can probe the gluino masses up to about 6 TeV with $36.1~fb^{-1}$ integrated luminosity. We also find that the decay $\tilde{g}\rightarrow \tilde{t}t$ can indirectly probe the stop mass up to about 4 TeV.

9/10 relevant

arXiv

Symbolic expressions for fully differential single **top** **quark** production
cross section and decay width of polarized top quark in presence of anomalous
Wtb couplings

**top**

**quark**production and its subsequent decay are investigated for the case of contributions involving anomalous Wtb couplings. We obtained analytical expressions for the differential width for the three-particle decay of a polarized t-

**quark**in its rest frame and also expressions for the differential cross sections of the full process of production and decay of the t-

**quark**($2\to 4$) as a function of the energy of a charged lepton and two angles of orientation of the quantization axis of the t-

**quark**spin. The expression is presented in the most general form for the case of real and imaginary vector and tensor anomalous Wtb couplings. It is shown that shapes of certain multidimensional kinematic distributions of final state particles are significantly different for the contributions proportional to different combinations of the anomalous couplings. The most noticeable differences appear in the shape of the surfaces of two-dimensional distributions, where one of the variables is the energy of a charged lepton and the other is one of the t-

**quark**spin orientation angles. Observed properties are confirmed by two methods of computations either from the obtained symbolic expression for the differential cross sections of full process of production and decay of the t-

**quark**or by means of the CompHEP program for the complete process involving the t-channel single

**top**. In addition, using the obtained analytical expressions, we estimate the statistical accuracy of extracting values of the anomalous Wtb couplings for different levels of the expected integral luminosity at the LHC.

10/10 relevant

arXiv

**Top** **quark** as a probe of heavy Majorana neutrino at the LHC and future
collider

**top**

**quark**neutrinoless double beta decay process $t \to b \ell^+ \ell^+ j j^{\prime}$ ($\ell=e, \mu$) at hadron colliders. By performing detector level simulation, we demonstrate that the heavy neutrinos with the mixing parameters $|V_{eN,\mu N}|^2 \gtrsim 5\times 10^{-6}$ in the mass range of 15 GeV $< m_N

10/10 relevant

arXiv

SUSY-QCD corrected and Sommerfeld enhanced stau annihilation into heavy
**quarks** with scheme and scale uncertainties

**quarks**in the phenomenological Minimal Supersymmetric Standard Model within the \DMNLO project. We present the calculation of the corresponding cross section including corrections up to $\mathcal{O}(\alpha_s)$ and QED Sommerfeld enhancement. The numerical impact of these corrections is discussed for the cross section and the dark matter relic density, where we focus on

**top**-

**quark**final states and consider either neutralino or gravitino dark matter. Similarly to previous work, we find that the presented corrections should be included when calculating the relic density or extracting parameters from cosmological observations. Considering scheme and scale variations, we estimate the theoretical uncertainty that affects the prediction of the annihilation cross section and thus the prediction of the relic density.

4/10 relevant

arXiv

On the ATLAS **Top** Mass Measurements and the Potential for Stealth Stop
Contamination

**top**

**quark**off its mass shell; such decays would contaminate the top mass measurements. Expand abstract.

**top**

**quark**- is a key goal of the physics program enabled by the Large Hadron Collider. Although much of the accessible parameter space has already been probed, a narrow open region persists. This "stealth stop" regime is characterized by decay kinematics that force the final state

**top**

**quark**off its mass shell; such decays would contaminate the

**top**mass measurements. We investigate the resulting bias imparted to the template method based ATLAS approach. A careful recasting of these results shows that effect can be as large as 2.0 GeV, comparable to the current quoted error bar. Thus, a robust exploration of the stealth stop splinter requires the simultaneous consideration of the impact on the

**top**mass. Additionally, we explore the robustness of the template technique, and point out a simple strategy for improving the methodology implemented for the semi-leptonic channel.

6/10 relevant

arXiv

Tumbling to the **top**

**top**

**quark**to a composite Goldstone Higgs, which we dub {\it Global Extended Technicolor} (GETC). Top, techni-fermions and spin-1 mediators arise as bound states of a tumbling chiral gauge theory. We propose a simple model based on a tumbling $SU(4)$ dynamics, which predicts partial compositeness for the

**top**and an $SU(3)$ model with 6 Dirac flavours for the low-energy composite Higgs. Neutron decay bounds require the new dynamics to confine above $10^{6\div 7}$ TeV. A simple extension of the basic model allows to generate partial compositeness also for bottom and tau, and a walking dynamics from an intermediate $SU(3)$ theory with 10 flavours (6 light + 4 heavy), whose dynamics can be studied on the Lattice.

4/10 relevant

arXiv