arXiv subjects

E. Gurkanli

Publications and source records attributed to E. Gurkanli.

16 recordsLinked to original sources

arXiv2025

The future muon collider for the research of the anomalous neutral quartic $Zγγγ$, $ZZγγ$, and $ZZZγ$ couplings

In the post-LHC era, the muon collider represents a frontier project capable of providing high-energy and high-luminosity leptonic collisions among future lepton-lepton particle accelerators. In addition, it provides significantly cleaner final states than those produced in hadron collisions. With this expectation in mind, in this article, we research the sensitivity of the anomalous neutral gauge boson couplings $Zγγγ$, $ZZγγ$, and $ZZZγ$ defined by dimension-8 operators, through the $μ^+μ^- \to μ^+μ^-Zγ$ signal, with the $Z$-boson decaying to a neutrino pair. The projections at the future muon collider with a center-of-mass energy of $\sqrt{s}=10$ TeV, integrated luminosity of ${\cal L}=10$ $\rm ab^{-1}$, and systematic uncertainties of $δ_{sys}=0\%, 3\%, 5\%$, give an expected sensitivity on the anomalous $f_ {T,j}/Λ^4$ couplings at $95\%$ confidence level of the order of ${\cal O}(10^{-3}- 10^{-1})$ $\rm TeV^{-4}$. Compared with the research of the ATLAS and CMS Collaborations on the anomalous quartic gauge couplings, we find that the high-luminosity future muon collider could have better sensitivity.

hep-ph↗

arXiv2024

Probing the anomalous triple $ZZγ$ and $Zγγ$ couplings at the FCC-$μp$ and SPPC-$μp$

In this study, 24.5 TeV CoM energy FCC-$μp$ and 20.2 TeV CoM energy SPPC-$μp$ muon-proton colliders have been utilized to explore the anomalous $ZZγ$ and $Zγγ$ couplings corresponding to dim-8 operators through the process of $μ^- γ\to Z l^{-} \to l^{-} \tilde{ν_{l}} ν_{l}$. A cut-based method has been applied to enhance the signal background ratio in the analysis. Coupling sensitivities, at a 95\% Confidence Level (C.L.), under the systematic uncertainties of 0\% and 5\%, were obtained with luminosities of ${\cal L}_{int}=5$ and 42.8 fb$^{-1}$ for FCC-$μp$ and SPPC-$μp$ colliders, respectively. The sensitivities for anomalous $C_{BB}/Λ^{4}$, $C_{\tilde{B}W}/Λ^{4}$, $C_{BW}/Λ^{4}$ and $C_{WW}/Λ^{4}$ couplings without systematic uncertainty for FCC-$μp$ and SPPC-$μp$ were found as follows, respectively: [0.068; 0.070] TeV-4, [-0.187; 0.184] TeV-4, [-0.236; 0.238] TeV-4, [-0.619; 0.621] TeV-4, and [-0.066; 0.051] TeV-4, [-0.158; 0.151] TeV-4, [-0.207; 0.192] TeV-4, [-0.514; 0.522] TeV-4.

hep-ph↗

arXiv2024

Search for the anomalous $ZZZ$ and $ZZγ$ gauge couplings through the process $e^+e^- \to ZZ $ with unpolarized and polarized beams

This work offers the constraints on the anomalous neutral triple gauge couplings for the process $e^+e^- \to ZZ $ at the CLIC with $\sqrt{s}=3$ TeV. The realistic CLIC detector environments and their effects are considered in our analysis. The study is planned for the decays of produced $Z$ bosons to a pair of charged leptons (electrons or muons) and neutrino pairs. The bounds on the anomalous neutral triple gauge couplings defining $CP$-violating $C_{\widetilde{B}W}/{Λ^4}$ coupling and three $CP$-conserving $C_{WW}/{Λ^4}$, $C_{BW}/{Λ^4}$, and $C_{BB}/{Λ^4}$ couplings are obtained. Also, the effects and advantages of polarization for incoming electron beams in these calculations are investigated.

hep-ph↗

arXiv2024

Sensitivities on the anomalous quartic $γγγγ$ and $γγγZ$ couplings at the CLIC

It is essential to directly investigate the self-couplings of gauge bosons in the Standard Model (SM) due to its non-Abelian nature, as these couplings play a significant role in comprehending the gauge structure of the model. The discrepancies between the Standard Model's expectations and the measured value of gauge boson self-couplings would serve as strong evidence towards the existence of new physics phenomena that extend beyond the Standard Model. Such deviations could provide valuable insights into the nature of new physics and potentially lead to a deeper understanding of fundamental particles and their interactions. In this study, we examine the sensitivities of anomalous couplings associated with dimension-8 operators that affect the $γγγγ$ and $Z γγγ$ quartic vertices. The study focuses on the process $e^- γ\to e^-γγ$ with the incoming photon under Weizsäcker-Williams approximation at the stage-3 scenerio of Compact Linear Collider (CLIC) that is refer to a CoM energy of 3 TeV. Due to the CLIC options, we take into account the both unpolarized and $\mp80\%$ polarized electron beam with the related integrated luminosities of ${\cal L}=5, 4, 1$ $\rm ab^{-1}$ under the systematic uncertainties of $δ_{sys}=0, 3, 5$. Obtained sensitivities on the anomalous quartic gauge couplings (aQGCs) for the process $e^- γ\to e^-γγ$ at $\sqrt{s}= 3$ TeV and various polarizations, are improved by a factor of 2-200 times better for the couplings $f_{T,j}/Λ^4$ compared with the experimental results.

hep-ph↗

arXiv2023

Expected sensitivity on the anomalous quartic neutral gauge couplings in $γγ$ collisions at the CLIC

The presence of multi-boson self-interactions is implied by the non-Abelian gauge structure of the Standard Model (SM). Precise measurements of these interactions allow not only testing the nature of the SM but also new physics contribution arising from the beyond SM. The investigation of these interactions can be approached in a model-independent manner using an effective theory approach, which forms the main motivation of this study. In this paper, we examine the anomalous neutral quartic gauge couplings through the process $γγ\rightarrow Z Z$ at the Compact Linear Collider (CLIC) with the center-of-mass energy of $\sqrt{s}=3$ TeV, integrated luminosities of ${\cal L}=5$ $\rm ab^{-1}$. The anomalous neutral quartic gauge couplings is implemented into FeynRules to generate a UFO module inserted into Madgraph to generate both background and signal events. These events are then passed through Pythia 8 for parton showering and Delphes to include realistic detector effects. We obtain that the sensitivities on the anomalous quartic neutral gauge couplings with $95\%$ Confidence Level are given as: $f_{T0}/Λ^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm TeV^{-4}}$, $f_{T1}/Λ^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm TeV^{-4}}$,$f_{T2}/Λ^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm TeV^{-4}}$,$f_{T0}/Λ^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm TeV^{-4}}$, $f_{T5}/Λ^{4}=[-4.08; 4.08]\times 10^{-4}$ ${\rm TeV^{-4}}$ and $f_{T8}/Λ^{4}=[-1.10; 1.10]\times10^{-4}$ ${\rm TeV^{-4}}$. Our results on the anomalous quartic neutral gauge couplings are set more stringent sensitivity with respect to the recent experimental limits.

hep-ph↗

arXiv2023

Study of the projected sensitivity on the anomalous quartic gauge couplings via $Zγγ$ production at the CLIC

Gauge boson self-couplings are completely defined by the non-Abelian gauge symmetry of the Standard Model (SM). For this reason, a direct search for these couplings is extremely significant in understanding the gauge structure of the SM. The possible deviation from the SM predictions of gauge boson self-couplings would be a sign of the presence of new physics beyond the SM. In this work, we study the sensitivities on the anomalous couplings defined by dimension-8 operators related to the $ZZγγ$ and $Zγγγ$ quartic vertices through the process $e^+e^- \to Zγγ$ with Z-boson decaying to charged leptons at the Compact Linear Collider (CLIC). We analyze the center-of-mass energy of 3 TeV, integrated luminosities of ${\cal L}=1, 4, 5$ $\rm ab^{-1}$, systematic uncertainties of $δ_{sys}=0\%, 3\%, 5\%$, unpolarized and polarized electron beams and considering the Initial State Radiation and Beamstrahlung effects for extraction of expected sensitivity on the anomalous $f_ {T,j}/Λ^4$ couplings at $95\%$ confidence level, which are especially sensitive to the $Zγγ$ channel. It is clear from the results that we expect better limits on the couplings if the systematic error is improved. The best limits obtained on the anomalous quartic couplings for the process $e^+e^- \to Zγγ$ with $\sqrt{s}= 3$ TeV, ${\cal L}=5$ $\rm ab^{-1}$, and $δ_{sys}=0\%$ can be approximately improved up to about 1.1 times better than the limits obtained with $δ_{sys}=5\%$. Our sensitivities on the anomalous quartic couplings can set more stringent sensitivity by two orders of magnitude concerning the best sensitivity derived from the current experimental limits. Finally, with initial electron beam polarization, the sensitivity of the anomalous quartic couplings improves by almost a factor of 1.2.

hep-ph↗

arXiv2022

Model-independent study on the anomalous $ZZγ$ and $Zγγ$ couplings at the future muon collider

In this study, we investigate the potential of $μ^{-} μ^{+}\to Zγ\to ν\barνγ$ process at the future muon collider with a center-of-mass energy of 3 TeV to examine the anomalous $ZZγ$ and $Zγγ$ neutral triple gauge couplings defining $CP$-conserving $C_{\widetilde{B}W}/{Λ^4}$ coupling and three $CP$-violating $C_{BB}/{Λ^4}$, $C_{BW}/{Λ^4}$, $C_{WW}/{Λ^4}$ couplings. All signal and relevant background events are generated in MadGraph and passed through Pythia for parton showering and hadronization. Detector effects are also considered via tuned muon detector cards in Delphes. The effects of systematic uncertainties of $0\%$, $3\%$ and $5\%$ on the sensitivities are studied. The best sensitivities obtained from the process $μ^{-} μ^{+}\to Zγ\to ν\barνγ$ are $[-6.53;6.64]\times10^{-2}$ TeV$^{-4}$ on $CP$-conserving $C_{\widetilde{B}W}/{Λ^4}$ coupling and $[-2.47;2.47]\times10^{-2}$ TeV$^{-4}$, $[-8.46;8.46]\times10^{-2}$ TeV$^{-4}$ and $[-2.20;2.20]\times10^{-1}$ TeV$^{-4}$ on $CP$-conserving $C_{BB}/{Λ^4}$, $C_{BW}/{Λ^4}$, $C_{WW}/{Λ^4}$ couplings , respectively. Our obtained results on the anomalous neutral gauge couplings set more stringent sensitivity, ranging between 5 and 15 times than the current experimental results while slightly better than the phenomenological studies at future pp colliders such as the HL-LHC, the HE-LHC and the FCC-hh, respectively. On the other hand, we can see that the bounds on the anomalous neutral gauge couplings expected to be obtained for the future $e^{-}e^{+}$ colliders such as the CLIC are roughly 2 times better than our results.

hep-ph↗

arXiv2022

Bounds on anomalous quartic $WWZγ$ couplings in $e^-p$ collisions at the FCC-he

Non-Abelian structure of the Standard Model predicts the self-interactions of gauge bosons triple gauge couplings (TGC) and quartic gauge couplings (QGC). On the other hand, it is also important to determine the deviations from Standard Model (SM) via anomalous triple gauge couplings (aTGC) and anomalous quartic gauge couplings (aQGC) to test the nature of the Standard Model (SM) and to see the effects of new physics arising from the beyond standard model (BSM). In this study, we focus on the $e^-p \to j Zγν_e \to j (l^{+} l^{-})γν_e$ process to examine the $WWZγ$ anomalous quartic gauge couplings (aQGC) at the Future Circular Collider-hadron electron (FCC-he) with center-of-mass energy $\sqrt{s}=5.29$ TeV using with a model-independent way in the effective theory approach. A Cut-based method are applied to analyse the signal and relevant SM background. Using with the total cross-sections, we constrained on the anomalous $ f_ {T,i=0,1,2,5,6,7}/Λ^4$ couplings arising from dimension-8 operators at $95\%$ Confidence Level (C.L.) for the dilepton decay of the $Z$-boson. The results are composed with integrated luminosities of ${\cal L}=1,2$ and $3$ $\rm ab^{-1}$ under the systematic uncertainties of $\%0$, $\%5$ and $\%10$. In the calculations, we use the form factor to eleminate the effects of the violation of unitarity. With this, we obtained the limits for the energy scale of the form factor $Λ=1$ TeV. In addition to all this, we use the adventages of $ep$ collisions for analysing the process with much cleaner environment and lower background effects comparing with the $pp$ collisions. The obtained sensitivities on $ f_ {T,i=0,1,2,5,6,7}/Λ^4$ are comparable with the experimental results and related phenomenological studies in the literature.

hep-ph↗

arXiv2022

Future projections on the anomalous $WWγγ$ couplings in hadron-hadron interactions at the FCC-hh

We carry out a study in the approach of a dimension-8 effective field theory on the anomalous quartic $WWγγ$ couplings that arise from the process $pp \to Wγγ$ at the Future Circular Collider-hadron hadron (FCC-hh). The process is sensitive to the $WWγγ$ vertex, and future projections on the anomalous $f_ {M,i}/Λ^4$ and $ f_ {T,j}/Λ^4$ couplings can be put by measurements of $Wγγ$ production. We illustrate the physics opportunities and reach of the FCC-hh operating for a high integrated luminosity scenario of ${\cal L}=1, 5, 10, 30$ ${\rm ab}^{-1}$ of proton-proton collisions at a center-of-mass energy of $\sqrt{s}=100$ TeV and systematic uncertainties of $δ_{sys}=0\%, 3\%, 5\%, 10\%$. Production cross-sections of the signal and the sensitivity constraints on the anomalous $f_ {M,i}/Λ^4$ and $ f_ {T,j}/Λ^4$ couplings at $95\%$ C.L. are identified through the leptonic and hadronic decay modes of the $W$-boson. The FCC-hh sensitivity on these anomalous couplings is expected might reach up to the order of magnitude ${\cal O}(10^{-4}-10^1)$. These sensitivity perspectives indicate that the $pp \to Wγγ$ channel at the FCC-hh has a greater potential to search for the anomalous quartic $WWγγ$ couplings and to search for new physics than present colliders.

hep-ph↗

arXiv2022

Search for the anomalous $ZZγ$ and $Zγγ$ couplings via $ννγ$ production at the CLIC

The non-Abelian gauge structure of the Standard Model implies the presence of the multi-boson self-interactions. Precise measurements in experimental and theoretical studies of these interactions allow not only testing the nature of the Standard Model but also new physics contribution coming from the beyond Standard Model. These interactions can be examined using a model-independent way in effective theory approach that composes the motivation part of this study. In this paper, we examine the anomalous $ZZγ$ and $Zγγ$ neutral triple gauge couplings via the process $e^{-} e^{+}\to Zγ$ for the neutrino-antineutrino pair decay of $Z$ boson. It has performed with both unpolarized and polarized electron beams at the Compact Linear Collider with $\sqrt{s}= 3$ TeV. The study focused on $CP$-conserving $C_{\widetilde{B}W}/{Λ^4}$ and $CP$-violating $C_{BB}/{Λ^4}$, $C_{BW}/{Λ^4}$, $C_{WW}/{Λ^4}$ couplings. Obtained sensitivities on the anomalous neutral triple gauge couplings with $95\%$ Confidence Level are given with systematic uncertainties of $0\%$, $5\%$ and $10\%$ for unpolarized, $-80\%$ and $80\%$ polarized electron beams with integrated luminosities of ${\cal L}_{\text{int}}=5$ $\rm ab^{-1}$, ${\cal L}_{\text{int}}=4$ $\rm ab^{-1}$ and ${\cal L}_{\text{int}}=1$ $\rm ab^{-1}$, respectively. Comparing the latest experimental limits and related phenomenological studies, our results on the anomalous neutral gauge couplings are set more stringent sensitivity between 10-30 times of magnitude.

hep-ph↗

arXiv2021

Analysis of the anomalous quartic $WWWW$ couplings at the LHeC and the FCC-he

The quartic gauge boson couplings that identify the strengths of the gauge boson self-interactions are exactly determined by the non-Abelian gauge nature of the Standard Model. The examination of these couplings at $ep$ collisions with high center-of-mass energy and high integrated luminosity provides an important opportunity to test the validity of the Standard Model and the existence of new physics beyond the Standard Model. The quartic gauge boson couplings can contribute directly to multi-boson production at colliders. Therefore, we examine the potential of the process $ep \rightarrow ν_{e}W^{+}W^{-} j$ at the Large Hadron Electron Collider and the Future Circular Collider-hadron electron to study non-standard $WWWW$ couplings in a model independent way by means of the effective Lagrangian approach. We present an investigation on measuring $W^{+}W^{-}$ production in pure leptonic and semileptonic decay channels. In addition, we calculate the sensitivity limits at $95\%$ Confidence Level on the anomalous $\frac{f_{M0}}{Λ^{4}}$, $\frac{f_{M1}}{Λ^{4}}$, $\frac{f_{M7}}{Λ^{4}}$, $\frac{f_{S0}}{Λ^{4}}$, $\frac{f_{S1}}{Λ^{4}}$, $\frac{f_{T0}}{Λ^{4}}$, $\frac{f_{T1}}{Λ^{4}}$ and $\frac{f_{T2}}{Λ^{4}}$ couplings obtained by dimension-8 operators through the process $ep \rightarrow ν_{e}W^{+}W^{-} j$ for the Large Hadron Electron Collider and the Future Circular Hadron Electron Collider's different center-of-mass energies and integrated luminosities. Our results show that with the process $ep \rightarrow ν_{e}W^{+}W^{-} j$ at the Large Hadron Electron Collider and the Future Circular Collider-hadron electron the sensitivity estimated on the anomalous $WWWW$ couplings can be importantly strengthened.

hep-ph↗

arXiv2021

Study on the anomalous quartic $W^+W^-γγ$ couplings of electroweak bosons in $e^-p$ collisions at the LHeC and the FCC-he

In this paper, a study is carried out on the $e^-p \to e^-γ^* p \to p W^+γν_e$ production to probe quartic $W^+W^-γγ$ couplings using 10, 100 ${\rm fb^{-1}}$ of $e^-p$ collisions data at $\sqrt{s}$= 1.30, 1.98 GeV at the Large Hadron electron Collider (LHeC) and 100, 1000 ${\rm fb^{-1}}$ with $\sqrt{s}$= 3.46, 5.29 GeV at the Future Circular Collider-hadron electron (FCC-he). Production cross-sections are determined for both at leptonic and hadronic decay channel of the $W$-boson. With the data from future $e^-p$ colliders, it is possible to obtain sensitivity measures at $95\%$ C.L. on the anomalous $f_ {M,i}/Λ^4$ and $ f_ {T,i}/Λ^4$ couplings which are competitive with the limits obtained by the LHC, as well as with others limits reported in the literature. The production mode $e^-p \to e^-γ^* p \to p W^+γν_e $ in $e^-p$ collisions offers a window for study the quartic $W^+W^-γγ$ electroweak bosons couplings at the LHeC and the FCC-he, which provides a much cleaner collision environment than the LHC.

hep-ph↗

arXiv2020

Model independent study for the anomalous quartic $WWγγ$ couplings at Future Electron-Proton Colliders

The Large Hadron Electron Collider and the Future Circular Collider-hadron electron with high center-of-mass energy and luminosity allow to better understand the Standard Model and to examine new physics beyond the Standard Model in the electroweak sector. Multi-boson processes permit for a measurement of the gauge boson self-interactions of the Standard Model that can be used to determine the anomalous gauge boson couplings. For this purpose, we present a study of the process $ep \rightarrow ν_{e} γγj$ at the Large Hadron Electron Collider with center-of-mass energies of 1.30, 1.98 TeV and at the Future Circular Collider-hadron electron with center-of-mass energies of 7.07, 10 TeV to interpret the anomalous quartic $WWγγ$ gauge couplings using a model independent way in the framework of effective field theory. We obtain the sensitivity limits at $95\%$ Confidence Level on 13 different anomalous couplings arising from dimension-8 operators. The best limit in $f_{Mi}/Λ^{4}$ ($i=0,1,2,3,4,5,7$) parameters is obtained for $f_{M2}/Λ^{4}$ parameter while the best sensitivity derived on $f_{Ti}/Λ^{4}$ ($i=0,1,2,5,6,7$) parameters is obtained for $f_{T5}/Λ^{4}$. In addition, this study is the first report on the anomalous quartic couplings determined by effective Lagrangians at $ep$ colliders.

hep-ph↗

arXiv2020

Sensitivity physics expected to the measurement of the quartic $WWγγ$ couplings at the LHeC and the FCC-he

We explore the physics expected sensitivity at the Large Hadron electron Collider (LHeC) and the Future Circular Collider-hadron electron (FCC-he) to search for the anomalous quartic $WWγγ$ couplings in single $W$-boson production in association with a photon. We study the process $ep \to e^-γ^* p \to eWγq'X$ via the subprocess $γ^* q \to Wγq'$. The center-of-mass energies and luminosities of the LHeC are assumed to be $\sqrt{s}=1.30, 1.98$ TeV, ${\cal L}=10-100$ ${\rm fb^{-1} }$ and for the FCC-he $\sqrt{s}=3.46, 5.29$ TeV and ${\cal L}=100-1000$ ${\rm fb^{-1} }$. With these energies and luminosities, we estimate bounds on the anomalous quartic $WWγγ$ couplings at $95\%$ C.L., which can be an order of magnitude stringent than the experimental limits report by ATLAS and CMS Collaborations at the LHC.

hep-ph↗

arXiv2019

Anomalous quartic $WWγγ$ couplings in $ep$ collisions at the LHeC and the FCC-he

We conducted a study on measuring $W^+W^-$ production and on the sensitivity limits at $95\%$ Confidence Level on thirteen anomalous couplings obtained by dimension-8 operators which are related to the anomalous quartic $WWγγ$ couplings. We consider the main $e^-p \to e^-γ^*γ^*p \to e^-W^+W^-p$ reaction with the sub-process $γ^*γ^* \to W^+W^-$ at the Large Hadron electron Collider (LHeC) and the Future Circular Collider-hadron electron (FCC-he). For the LHeC, energies of the $e^-$ beams are taken to be $E_e =60$ and 140 GeV and the energy of the $p$ beams is taken to be $E_p = 7$ TeV. For the FCC-he, energies of the $e^-$ beams are taken to be $E_e =60$ and 140 GeV and the energy of the $p$ beams is taken to be $E_p = 50$ TeV, respectively. It is interesting to notice that the LHeC and the FCC-he will lead to model-independent limits on the anomalous quartic $WWγγ$ couplings which are one order of magnitude stringent than the CMS Collaboration limits, in addition to being competitive with other limits reported in the literature.

hep-ph↗

arXiv2016

Prediction for CP Violation via Electric Dipole Moment of $τ$ Lepton in ${γγ\to τ^{+}τ^{-}}$ Process at CLIC

Pair production of tau leptons in two photon collision ${γγ\to τ^{+}τ}^{-}$ is studied at CLIC to test CP violating QED couplings of tau leptons. CP violating effects are investigated using tau pair spin correlations which are observed through the hadronic decay of each $τ$ into $πν$. Competitive bounds with previous works on the electric dipole moment from CP odd terms have been obtained.

hep-ph↗