We discuss a formalism for the spin correlations and polarizations in two-particle systems with spins half-half, half-one one-one, provide connections between joint angular distributions of decay products identifying asymmetries them. demonstrate processes $e^-e^+\to t\bar{t}$, $gb \to tW^-$ ZZ$ standard model as examples. investigate effect some anomalous couplings on $u\bar{d}\to ZW^+$ at parton level compare their strengths. The have potential to significant improvement over probing couplings.

We study the anomalous trilinear gauge couplings of Z and $$\gamma $$ using a complete set polarization asymmetries for boson in $$e^+e^-\rightarrow ZZ/Z\gamma processes with unpolarized initial beams. use these asymmetries, along cross section, to obtain simultaneous limit on all Markov Chain Monte Carlo (MCMC) method. For an $$e^+e^-$$ collider running at 500 GeV center-of-mass energy 100 fb $$^{-1}$$ integrated luminosity limits are 1–3 $$\times 10^{-3}$$ .

We study anomalous couplings among neutral gauge bosons in $ZZ$ production at the LHC for $\sqrt{s}=13$ TeV $4$-lepton final state. use cross section and polarization asymmetries of $Z$ boson to estimate simultaneous limits on coupling using Markov-Chain--Monte-Carlo (MCMC) method luminosities $35.9$ fb$^{-1}$, $150$ $300$ fb$^{-1}$ $1000$ fb$^{-1}$. The $CP$-even asymmetry $A_{x^2-y^2}$ is sensitive mainly $CP$-odd $f_4^{Z/γ}$ (quadratically) providing a probe identify nature interaction...

The anomalous trilinear gauge couplings of $Z$ and $\gamma$ are studied in $e^+e^-\to ZZ/Z\gamma$ with longitudinal beam polarizations using a complete set polarization asymmetries for the boson. We quantify goodness terms likelihood find best-choice $e^-$ $e^+$ to be ($+0.16$, $-0.16$), ($+0.09$, $-0.10$) ($+0.12$, $-0.12$) $ZZ$, $Z\gamma$ combined processes, respectively. Simultaneous limits on obtained these choices Markov-Chain--Monte-Carlo (MCMC) an $e^+e^-$ collider running at...

We study the anomalous $t\bar{t}Z$ couplings in production leptonic final state at $13$ TeV LHC. use polarizations of top quarks and $Z$ boson, two-body three-body spin correlations among cross section to probe couplings. estimate one parameter simultaneous limits on effective vertex as well operators for a set luminosities $150$ fb$^{-1}$, $300$ $1000$ $3000$ fb$^{-1}$. The are found be helpful better constrain

We study the anomalous $W^+W^-V$ ($V=\gamma,Z$) couplings in $e^+e^-\to W^+W^-$ using complete set of polarization observables $W$ boson with longitudinally polarized electron ($e^-$) and positron ($e^+$) beams. For effective couplings, we use most general Lorentz invariant form factor parametrization as well $SU(2)\times U(1)$ dimension-$6$ operators. estimate simultaneous limits on Markov-Chain--Monte-Carlo (MCMC) method for an $e^+e^-$ collider running at center mass energy $\sqrt{s}=500$...

A study of the top quark flavor changing neutral current (FCNC) through $Z$-boson has been performed in proposed future ${e}^{\ensuremath{-}}p$ collider for energy, ${E}_{e(p)}=60(7000)\text{ }\text{ }\mathrm{GeV}$. We considered an effective theory where anomalous FCNC couplings are vector and tensor nature. The effect these is probed single production along with scattered electron. polar angle $\ensuremath{\theta}$ electrons coming out primary vertex association polarization asymmetries...

Abstract We perform a collider search for fatjet signals originating from boosted heavy neutral and charged leptons with masses between few hundred GeV to TeV. These originate the decay of gauge bosons above 4 TeV in left-right symmetric extension Standard Model (SM), which considers universal seesaw mechanism generation all SM fermion masses. The arise naturally this model due presence partners fermions carrying large boosts. employ substructure based variables lepton sub-jet fraction ( LSF...

Entanglement, rooted in the non-deterministic, non-local nature of quantum mechanics, serves as a fundamental correlation. High-energy particle colliders offer unique platform for exploring entanglement relativistic regime. The recent observation $t\bar{t}$ production by ATLAS has sparked significant interest investigating phenomena at colliders. While bipartite receives extensive attention, tripartite remains relatively uncharted. We investigate $t\bar{t}Z$ Large Hadron Collider (LHC)...

Abstract The interaction between the dark $$U(1)_d$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>U</mml:mi> <mml:msub> <mml:mo>(</mml:mo> <mml:mn>1</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> <mml:mi>d</mml:mi> </mml:msub> </mml:math> sector with visible Standard Model (SM) takes place through kinetic mixing photon field $$Z_d^\mu $$ <mml:msubsup> <mml:mi>Z</mml:mi> <mml:mi>μ</mml:mi> </mml:msubsup> and SM $$U(1)_Y$$ <mml:mi>Y</mml:mi> gauge $$B_\mu...

A bstract We study the anomalous triple gauge boson couplings (aTGC) in ZW ± production 3 l + "Image missing" channel at LHC for $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV. use cross sections, azimuthal asymmetry, forward-backward asymmetry and polarization asymmetries of Z reconstructed W to estimate simultaneous limits on both effective vertex formalism as well operator approach using...

The recent discovery of a Higgs boson at the LHC, while establishing mechanism as way electroweak symmetry breaking, started an era precision measurements involving boson. In effective Lagrangian framework, we consider $e^+e^-\rightarrow ZHH$ process ILC running centre mass energy 500 GeV to investigate effect $ZZH$ and $ZZHH$ couplings on sensitivity $HHH$ coupling in this process. Our results show that trilinear self has somewhat strong dependence Higgs-gauge couplings. Single two...

In the detailed probe of Higgs boson properties at Large Hadron Collider, and in looking for new physics signatures electroweak symmetry breaking sector, bottom quark Yukawa coupling has a crucial role. We investigate possible departure from standard model value $b\bar{b}h$ coupling, phenomenologically expressed terms modification factor $\alpha_b$, $b\bar{b}$-associated production $125$-GeV scalar high-luminosity LHC. next-to-leading order estimate, we make use gradient boosting algorithm...

We study the anomalous $W^+W^-V$ ($V=γ,Z$) couplings in $e^+e^-\to W^+W^-$ using complete set of polarization observables $W$ boson with longitudinally polarized beams. use most general Lorentz invariant form factors parametrization as well $SU(2)\times U(1)$ dimension $6$ effective operators for couplings. estimate simultaneous limits on both parametrizations cross section, forward backward asymmetry and different kinematical cuts Markov-Chain--Monte-Carlo (MCMC) method an $e^+e^-$ collider...

Abstract We investigate the possibility of multi-lepton (four and six) signatures, including an exotic signature same-sign four-lepton (SS4L) as signals pair production a doubly charged Higgs in minimal left-right symmetric model, extended with two doublet scalars. The right-handed neutrino masses are generated this model through dimension-5 lepton-number violating operator allowing triplet scalar interactions leptons to become negligibly small. This leads interesting six-lepton SS4L...

We investigate the possibility to identify nature of spin exotic charged particles at future $e^+e^-$ collider in $l^\pm+2j+MET$ final state choosing IDM and MSSM as examples for new physics models with scalar fermionic particles, respectively. choose four benchmarks mass parameters a significant deviation from SM $W^+W^-$ background. find that $\cos\theta$ $W$ boson constructed $jj$ pair lepton have potential signal compared longitudinally polarized initial beams. A more robust comparison...

We study the $W$ boson associated single top quark production at Large Hadron Collider to probe anomalous chromomagnetic and chromoelectric moments of with help polarization spin correlation observables besides cross section in leptonic final state. reconstruct two neutrinos state using ${M}_{T2}$ assisted on-shell reconstruction method measure asymmetries boson. estimate limits on a detector-level simulation considering possible backgrounds for few sets integrated luminosities examine...

We study the anomalous $t\bar{t}Z$ couplings in production leptonic final state at $13$ TeV LHC. use polarizations of top quarks and $Z$ boson, two-body three-body spin correlations among cross section to probe couplings. estimate one parameter simultaneous limits on effective vertex as well operators for a set luminosities $150$ fb$^{-1}$, $300$ $1000$ $3000$ fb$^{-1}$. The are found be helpful better constrain

We study the prospect of measuring electroweak quantum numbers beyond Standard Model (SM) color sextet particles that decay into same-sign top quark pairs. Among these particles, scalars give rise to quarks with same chirality, while coming from vector would have opposite chirality. This difference gets encoded in angular distributions bottom and leptons originating decays quarks. utilize this feature energy final state jets distinguish among three possible resonances, taking account various...

We study the $W$ boson associated single top quark production at Large Hadron Collider to probe anomalous chromomagnetic and chromoelectric moments of with help polarization spin correlation observables besides cross section in leptonic final state. reconstruct two neutrinos state using ${M}_{T2}$ assisted on-shell reconstruction method measure asymmetries boson. estimate limits on a detector-level simulation considering possible backgrounds for few sets integrated luminosities examine...

We investigate the possibility of multi-lepton (four and six) signatures, including an exotic signature same-sign four-lepton (SS4L) as signals pair production a doubly charged Higgs in minimal left-right symmetric model, extended with two doublet scalars. The right-handed neutrino masses are generated this model through dimension-$5$ lepton-number violating operator allowing triplet scalar interactions leptons to become negligibly small. This leads interesting six-lepton SS4L signatures...

We study the prospect of measuring electroweak quantum numbers beyond Standard Model color sextet particles that decay into same-sign top-quark pairs. Among these particles, scalars give rise to top quarks with same chirality, while coming from vector would have opposite chirality. This difference gets encoded in angular distributions bottom and leptons originating decays quarks. utilize this feature energy final-state jets distinguish among three possible resonances, taking account various...