arXiv subjects

M. Koksal

Publications and source records attributed to M. Koksal.

18 recordsLinked to original sources

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.

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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.

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arXiv2019

Probing the anomalous electromagnetic dipole moments of the top quark in $γp$ collision at the LHC, the HL-LHC and the HE-LHC

The determination of the electromagnetic dipole moments of the top quark is one of the most important goals of the top quark physics program in the collider experiments. For this reason, the top quark pair production to investigate the sensitivity on the electric and magnetic dipole moments of the top quark via the process $pp\rightarrow p γp \rightarrow p t \bar{t} X$ at the Large Hadron Collider (LHC), the High-Luminosity Large Hadron Collider (HL-LHC) and High-Energy Large Hadron Collider (HE-LHC) is discussed. We apply pure leptonic and semileptonic decays for top quark pair production in the final state. Moreover, we consider systematic uncertainties of $0,3\%$ and $5\%$. The best limits obtained from the process $pp\rightarrow p γp \rightarrow p t \bar{t} X$ on the anomalous $a_{A}$ and $a_{V}$ couplings are $|a_{A}|=0.0200$ and $a_{V}=[-0.9959; 0.0003]$. Thus, our results indicate that the process $pp\rightarrow p γp \rightarrow p t \bar{t} X$ is a very good perspective to probe the electric and magnetic dipole moments of the top quark at the HL-LHC and the HE-LHC.

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arXiv2019

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

As the heaviest known fundamental particle, the 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 $t\bar{t}γ$ interactions to investigate limits on the anomalous $a_A$ and $a_V$ couplings through single top quark production of the process $pp\rightarrow p γ^{*} p \rightarrow p t W X$ 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 $γ^{*} b \rightarrow W t$ 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 $γ^{*} p$ collisions at the High Energy Large Hadron Collider improves the sensitivity limits of the anomalous coupling parameters according to previous studies.

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arXiv2019

Bounds on the non-standard $W^+W^-γ$ couplings at the LHeC and the FCC-he

We examine the potential of the $e^-p \to e^-γ^*p \to e^-W^-q'X$ ($γ^*$ is Weizsacker-Willams photon) reaction to probe the non-standard $W^+W^-γ$ couplings at the Large Hadron electron Collider (LHeC) and the Future Circular Collider-hadron electron (FCC-he). We find $95\%$ confidence level bounds on the anomalous coupling $Δκ_γ$ and $λ_γ$ parameters in the view of effective Lagrangian approach with various values of the integrated luminosity. We assume center-of-mass energies of the electron-proton system $\sqrt{s}= 1.30, 1.98, 7.07, 10\hspace{0.8mm}{\rm TeV}$ and luminosities ${\cal L} = 10-1000 \hspace{0.8mm}{\rm fb^{-1}}$. The best limits obtained from the process $e^-p \to e^-γ^*p \to e^-W^-q'X$ on the anomalous $Δκ_γ$ and $λ_γ$ couplings are $Δκ_γ= |0.00069|$ and $λ_γ= [-0.0099, 0.0054]$. These bounds show that the process under consideration is a good prospect for the searching of the non-standard $Δκ_γ$ and $λ_γ$ couplings at the LHeC and the FCC-he. In addition, our results provide complementary information on other results for $Δκ_γ$ and $λ_γ$ couplings.

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arXiv2018

Model-independent sensibility studies for the anomalous dipole moments of the $ν_τ$ at the CLIC based $γe^-$ colliders

To improve the theoretical prediction of the anomalous dipole moments of the $τ$-neutrino, we have carried out a study through the process $γe^- \to τ\barν_τν_e$, which represents an excellent and useful option in determination of these anomalous parameters. To study the potential of the process $γe^- \to τ\barν_τν_e$, we apply a future high-energy and high-luminosity linear electron-positron collider, such as the CLIC, with $\sqrt{s}=380, 1500, 3000\hspace{0.8mm}GeV$ and ${\cal L}=10, 50, 100, 200, 500, 1000, 1500, 2000, 3000\hspace{0.8mm}fb^{-1}$, and we consider systematic uncertainties of $δ_{sys}=0, 5, 10\%$. With these elements, we present a comprehensive and detailed sensitivity study on the total cross-section of the process $γe^- \to τ\barν_τν_e$, as well as on the dipole moments $μ_{ν_τ}$ and $d_{ν_τ}$ at the $95\%$ C.L., showing the feasibility of such process at the CLIC at the $γe^-$ mode with unpolarized and polarized electron beams.

hep-ph↗

arXiv2018

Model-independent bounds probing on the electromagnetic dipole moments of the $τ$-lepton at the CLIC

We establish model independent bounds on the anomalous magnetic and electric dipole moments of the tau-lepton using the two-photon processes $γγ\to τ^+τ^-$ and $γγ\to τ^+τ^-γ$. We use ${\cal L}=10, 50, 100, 300, 500, 1000, 1500, 2000, 3000 \hspace{0.8mm}fb^{-1}$ of data collected with the future $e^+e^-$ linear collider such as the CLIC at $\sqrt{s}=380, 1500, 3000 \hspace{0.8mm}GeV$ and we consider systematic uncertainties of $δ_{sys}=0, 3, 5\hspace{1mm}\%$. Precise bounds at $95\%$ C. L. on the anomalous dipole moments to the tau-lepton $-0.00015\leq \tilde{a}_τ\leq 0.00017$ and $|\tilde{d}_τ(ecm)|=9.040\times 10^{-19}$ are set from our study. Our results show that the processes under consideration are a very good prospect for probing the dipole moments of the tau-lepton at the future $e^+e^-$ linear collider at the $γγ$ mode.

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arXiv2017

Studies on the anomalous magnetic and electric dipole moments of the tau-neutrino in $pp$ collisions at the LHC

In this paper the production cross section $pp\rightarrow (γ, Z) \to ν_τ\bar ν_τγ+X$ in $pp$ collisions at $\sqrt{s}=8, 13, 14, 33TeV$ is presented. Furthermore, we estimate bounds at the $95\%C. L.$ on the dipole moments of the tau-neutrino using integrated luminosity of ${\cal L}=20, 50, 100, 200, 500, 1000, 3000 fb^{-1}$ collected with the ATLAS detector at the LHC and we consider systematic uncertainties of $δ_{sys}=0, 5, 10\%$. It is shown that the process under consideration is a good prospect for probing the dipole moments of the tau-neutrino at the LHC.

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arXiv2015

Improved bounds on the dipole moments of the tau-neutrino at high-energy $γ^* e^-$ and $γ^* γ^*$ collisions: ILC and CLIC

In this work we study the potential of the processes $e^+e^- \to e^+γ^* e^- \to e^+τ\barν_τν_e $ and $e^+e^- \to e^+γ^* γ^* e^- \to e^+ν_τ\barν_τe^- $ at a future high-energy and high-luminosity linear electron positron collider, such as the ILC and CLIC to study the sensibility on the anomalous magnetic and electric dipole moments of the tau-neutrino. For integrated luminosity of 590\hspace{1mm}$fb^{-1}$ and center-of-mass energy of 3\hspace{1mm}$TeV$, we derive $95 \% \hspace{1mm}C. L.$ limits on the dipole moments: $μ_{ν_τ}\leq 1.44 \times 10^{-6}μ_B$ and $d_{ν_τ}\leq 2.78 \times 10^{-17}\hspace{1mm} e\hspace{0.5mm} cm$ in the $γ^* e^-$ collision mode and of $μ_{ν_τ}\leq 3.4 \times 10^{-7}μ_B$ and $d_{ν_τ}\leq 6.56 \times 10^{-18}\hspace{1mm} e\hspace{0.5mm}cm$ with the $γ^*γ^*$ collision mode, improving the existing limits.

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arXiv2015

Graviton production through photon-quark scattering at the LHC

We have investigated real graviton emission in the ADD and RS model of extra dimensions through the photoproduction process pp-> p gamma p-> pGqX at the LHC. We have considered all contributions from the subprocesses gamma q -> G q, where q=u,d,c,s,b,anti-u,anti-d, anti-c, anti-s, anti-b quark. The constraints on model parameters of the ADD and RS model of extra dimensions have been calculated. During numerical calculations we have taken account of 3, 4, 5 and 6 large extra dimensional scenarios. The constraints on RS model parameters have been calculated by considering G -> gamma gamma, e^- e^+, mu^- mu^+ decay channels of the graviton.

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arXiv2014

Study of anomalous $WWγγ$ coupling sensitivity at the Compact Linear Collider

The Compact Linear Collider (CLIC) is one of the most popular linear colliders, planned to realize $e^{-}e^{+}$ collisions in three energy stages of $0.5$, $1.5$, and $3$ TeV. It has an energy scale never reached by any existing lepton collider. In this study, we present the sensitivity studies of the $WWγγ$ anomalous quartic gauge boson coupling (aQGC) in the three different processes $e^{+}e^{-}\rightarrow W^{-} W^{+}γ$, $e^{+}e^{-} \rightarrow e^{+}γ^{*} e^{-} \rightarrow e^{+} W^{-} γν_{e}$, and $e^{+}e^{-} \rightarrow e^{+}γ^{*} γ^{*} e^{-} \rightarrow e^{+} W^{-} W^{+} e^{-}$ at the CLIC. We obtained $95\%$ confidence level limits on the aQGC parameters $\frac{a_{0}}{Λ^{2}}$ and $\frac{a_{c}}{Λ^{2}}$ at various integrated luminosities and center-of-mass energies. The best limits obtained on the aQGCs $\frac{a_{0}}{Λ^{2}}$ and $\frac{a_{c}}{Λ^{2}}$ in these processes are at the order of $10^{-2}$ TeV$^{-2}$ and $10^{-1}$ TeV$^{-2}$, respectively.

hep-ph↗

arXiv2014

Anomalous interactions of the top quark with photon via flavor changing neutral currents at the CLIC

Photon-photon reaction provides an excellent opportunity to isolate the $tqγ$ vertex. For this purpose, we have examined the potential of the $e^{-}e^{+}\rightarrow e^{-}γ^{*}γ^{*}e^{+}\rightarrow e^{-}t\bar{q}e^{+}\rightarrow e^{-}W b\bar{q}e^{+}$ ($γ^{*}$ is the Weizsacker-Williams photon and $q=u,c$) process to investigate the anomalous $tqγ$ couplings in $γ^{*}γ^{*}$ collisions at the CLIC. We have obtained $95\%$ confidence level limits on the anomalous couplings for various values of the center-of-mass energy and integrated luminosity. We have shown that the limit on anomalous $κ_{tqγ}$ coupling is more restricted with respect to current experimental limits.

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arXiv2014

Probe of electromagnetic moments of the tau lepton in gamma-gamma collisions at the CLIC

We have investigated the electromagnetic moments of the tau lepton in $e^{+}e^{-} \rightarrow e^{+}γ^{*} γ^{*} e^{-}\rightarrow e^{+}τ\barτe^{-}$ process at the CLIC. We have obtained 95% confidence level bounds on the anomalous magnetic and electric dipole moments for various values of the integrated luminosity and the center of mass energy. We have shown that the $e^{+}e^{-} \rightarrow e^{+}γ^{*} γ^{*} e^{-}\rightarrow e^{+}τ\barτe^{-}$ process at the CLIC leads to a remarkable improvement in the existing experimental bounds on the anomalous magnetic and electric dipole moments.

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arXiv2013

Probe of extra dimensions in gamma q->gamma q at the LHC

We have examined TeV scale effects of extra spatial dimensions through the processes gamma q-> gamma q where q=u,d,c,s,b, anti-u, anti-d, anti-c, anti-s, anti-b. These processes have been treated in a photon-proton collision via the main reaction pp-> p gamma p-> p gamma qX at the LHC. We have employed equivalent photon approximation for incoming photon beams and performed statistical analysis for various forward detector acceptances.

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arXiv2013

The effect of electromagnetic properties of neutrinos on the photon-neutrino decoupling temperature

We examine the impact of electromagnetic properties of neutrinos on the annihilation of relic neutrinos with ultra high energy cosmic neutrinos for the $ν\barν\to γγ$ process. For this process, photon-neutrino decoupling temperature is calculated via effective lagrangian model beyond the standard model. We find that photon-neutrino decoupling temperature can be importantly reduced below the QCD phase transition with the model independent analysis defining electromagnetic properties of neutrinos.

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arXiv2012

The impact of excited neutrinos on $ν\barν\to γγ$ process

We examine the effect of excited neutrinos on the annihilation of relic neutrinos with ultra high energy cosmic neutrinos for the $ν\barν\to γγ$ process. The contribution of the excited neutrinos to the neutrino-photon decoupling temperature are calculated. We see that photon-neutrino decoupling temperature can be significantly reduced below the obtained value of the Standard Model with the impact of excited neutrinos.

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arXiv2011

Lepton flavor violation in medium energy setup of a beta-beam facility

We examine lepton flavor violating couplings of the neutrinos to W boson in medium energy setup of a beta-beam experiment. We show that muon production via quasielastic scattering and deep inelastic scattering processes nu_e n-> mu p and nu_e N-> mu X are very sensitive to W-mu-nu_e couplings. We perform a model independent analysis and obtain 95% confidence level bounds on these couplings.

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arXiv2011

Search for electromagnetic properties of the neutrinos at the LHC

Exclusive production of neutrinos via photon-photon fusion provides an excellent opportunity to probe electromagnetic properties of the neutrinos at the LHC. We explore the potential of processes pp-> p gamma gamma p -> p nu anti-nu p and pp -> p gamma gamma p -> p nu anti-nu Z p to probe neutrino-photon and neutrino-two photon couplings. We show that these reactions provide more than seven orders of magnitude improvement in neutrino-two photon couplings compared to LEP limits.

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