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Eda Alici

Publications and source records attributed to Eda Alici.

5 recordsLinked to original sources
arXiv2026

Pair Production of Singlet Vector-Like B Quarks in Boosted bZ Final States at a Muon Collider

We investigate the pair production of singlet vector-like bottom quarks at a future $10~\mathrm{TeV}$ muon collider in the boosted $Zb$ final-state topology. The signal process is considered as $\mu^{+}\mu^{-}\to B\bar{B}\to (Zb)(Z\bar{b})$, with one $Z$ boson decaying leptonically and the other hadronically, leading to a final state with an opposite-sign same-flavour dilepton pair, multiple jets, and two $b$-tagged jets. Signal and Standard Model background events are generated at leading order with MadGraph5\_\allowbreak aMC@NLO and subsequently interfaced with \textsc{Pythia}~8 for parton showering and hadronization. Detector effects are simulated with \textsc{Delphes} using a muon-collider detector configuration. A cut-based analysis exploiting boosted kinematics, including hard leading-$b$-jet transverse momentum, small dilepton angular separation, and large hadronic activity, is performed to suppress the dominant $ZZjj$, $ZZb\bar{b}$, and $t\bar{t}$ backgrounds. Statistical sensitivities are evaluated with the Asimov approximation, including both zero and $10\%$ background systematic uncertainty scenarios. For the singlet benchmark $\mathrm{BR}(B\to bZ)=0.25$ and an integrated luminosity of $10~\mathrm{ab}^{-1}$, a $5\sigma$ discovery reach up to $M_B\simeq 4.3~\mathrm{TeV}$ is obtained, reduced slightly to $M_B\simeq 4.2~\mathrm{TeV}$ when systematic effects are included. These results demonstrate that a $10~\mathrm{TeV}$ muon collider provides a powerful and clean environment for probing vector-like $B$ quarks well beyond present LHC limits.

hep-ph↗
arXiv2026

Sensitivity Analysis of Singlet Vector-Like B Quarks via Photon-Induced Processes at FCC--$\mu p$

This study presents a dedicated and systematic sensitivity analysis of a singlet-type vector-like $B$ quark at an FCC--$\mu p$ collider with a center-of-mass energy of $\sqrt{s}=24.5~\mathrm{TeV}$ via photon-induced production mechanisms. The analyses are based on the $B \to Zb$ decay and the lepton decay of the $Z$ boson on a clean and selective final state. In this regard, we observed that the applied kinematic cuts suppress the Standard Model backgrounds by several orders of magnitude while maintain high signal efficiency. Also, the obtained results show that for $\mathcal{L}=1000~\mathrm{fb^{-1}}$, even small coupling constant values in the mass range $M_B = 2$--$3$~TeV are accessible. In this context, an exclusion limit of $g^\ast \simeq 0.12$--$0.17$ at 95\% confidence level and a sensitivity in the range of $g^\ast \simeq 0.22$--$0.30$ for the $5\sigma$ discovery region are obtained. Moreover, the calculations indicate that scenarios with smaller ${\rm BR}(B\to Zb)$ values via increasing integrated luminosity values can be experimentally tested. As a result, the outputs of the study show that the FCC--$\mu p$ environment offers a unique and powerful discovery potential for vector-like quark searches that go beyond the current LHC limits and complement the decreasing sensitivity of the ep and $e^+e^-$ colliders in the high-mass regime. In this context, the findings suggest that the $\mu p$ colliders can be considered not only as a complementary option for the search of heavy new particles in the future accelerator programme, but also as a strategic discovery tool.

hep-ph↗
arXiv2024

Investigation of the FCNC couplings between the top quark and the photon in $\gamma\gamma$ and $\gamma^{*}\gamma^{*}$ collisions at the CLIC

The investigation of flavour-changing neutral current transitions(FCNC) involving the top quark are only possible with new theoretical frameworks that extend the Standard Model(SM), given that these transitions are almost entirely suppressed within the SM. In this regard, examining these transitions with extended theories beyond the SM may provide significant insights into future experiments. To this end, we present a phenomological study about the anomalous FCNC transitions via $tq\gamma$ couplings with effective field theory. Here, ${\gamma \gamma}{\rightarrow} {\textit{l}} {\nu}_\textit{l} b \bar{q} $ , ${e^{+}} {e^{-}} {\rightarrow} {e^{+}} {\gamma}^{} {\gamma}^{} {\rightarrow} {e^{+}} \textit{l}{} {\nu_\textit{ l}} b \bar{q} {e^{-}} $, $\gamma \gamma {\rightarrow} j \bar{j} b \bar{q} $ and ${e^{+}} {e ^{-}} {\rightarrow} {e^{+}} {\gamma}^{} {\gamma}^{} {e^{-}} {\rightarrow}{e^{+}} j \bar{j} b \bar{q} {e^{-}} $ processes are investigated for the CLIC at $\sqrt{s} =1.5$TeV and 3 TeV. Thus, we have calculated the constraints at $95{\%}$ confidence level on the $BR(t\rightarrow q\gamma)$. As a result, the obtained constraints are at least one order of magnitude better than the available experimental ones.

hep-ph↗
arXiv2024

Exploring Anomalous Flavor-Changing Neutral tqh Transitions at Future Muon Colliders: Insights from $\mu^{+}\mu^{-}\rightarrow t\bar{q}h$ Interactions

Flavour-changing neutral current (FCNC) interactions between the Higgs boson and the top quark are subject to significant suppression within the Standard Model (SM). Consequently, these interactions can only attain an observable level through the influence of Beyond the Standard Model (BSM) physics effects. It is therefore of great importance to investigate these rare interactions, both to test the limits of the Standard Model and to reveal new physical signatures.In this context, the present study analyses the signal of the process $\mu^+\mu^- \to t\bar{q}h$ and the background processes $t\bar{t}$, $tW\bar{b}$, $WWh$ and $WW$ at both in $\sqrt{s} = 1$ TeV and $\sqrt{s} = 3$ TeV energy levels. Analyses at the $1 TeV$ energy level reveal the observability of FCNC interactions even at low energy conditions and achieve the limit $\text{Br}(t \to qH) = 1.96 \times 10^{-4}$. This result corresponds to an improvement of approximately 1.5 times compared to the current limits of the ATLAS experiment, which are $3.0 \times 10^{-4}$. On the other hand, at the 3 TeV energy level, the most stringent limit was calculated under the luminosity $\mathcal{L} = 20 ab^{-1}$ , yielding a value of $\text{Br}(t \to qH) = 1.1 \times 10^{-4}$. This result coincides an improvement of approximately 3 times with respect to the current ATLAS experimental limits. The findings of the study underscore the potential of muon colliders in the search for new physics and the pivotal role they can play in the study of rare processes such as Higgs-top quark interactions. Consequently, the results are expected to provide a crucial foundation for both experimental and theoretical studies and to make a significant contribution to the search for BSM physics.

hep-ph↗
arXiv2022

Probing the anomalous tqgamma couplings in photon-proton collisions

The top quark flavor changing neutral current processes are extremely suppressed within the Standard Model. Nevertheless, they could be enhanced in a new physics model beyond the Standard Model. Investigating the top quark's flavor changing neutral current interactions at colliders would be an important test in terms of new physics. In this work, we examine the potentials of the processes ${e^{-}} {p} {\rightarrow} {e^{-}} {\gamma}^{*} {p} {\rightarrow} {e^{-}} W^{+} b {\gamma}^{*}{\rightarrow} {e^{-}} {j} {\bar{j}} b {\gamma}^{*} $ and ${e^{-}} {p} {\rightarrow} {e^{-}} {\gamma}^{*} {p} {\rightarrow} {e^{-}} W^{+} b {\gamma}^{*}{\rightarrow} {e^{-}} \textit{l} {\nu}_\textit{l} b {\gamma}^{*} $ at the FCC-eh with $\sqrt{s} = 7.08 $ and $ 10.0 TeV $ to study anomalous $tq\gamma$ couplings via effective Lagrangians. We obtain $95{\%}$ confidence level sensitivities on the anomalous coupling parameters at the three FCC-eh energies and various integrated luminosities. We find that our limits are at least two orders of magnitude better than the current LHC experimental results.

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