Search

We examine the potential of the $e^-p \to e^-��^*p \to e^-W^-q'X$ ($��^*$ is Weizsacker-Willams photon) reaction to probe the non-standard $W^+W^-��$ 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 $����_��$ and $��_��$ 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 $e^-p \to e^-��^*p \to e^-W^-q'X$ on the anomalous $����_��$ and $��_��$ couplings are $����_��= |0.00069|$ and $��_��= [-0.0099, 0.0054]$. These bounds show that the process under consideration is a good prospect for the searching of the non-standard $����_��$ and $��_��$ couplings at the LHeC and the FCC-he. In addition, our results provide complementary information on other results for $����_��$ and $��_��$ couplings., 16 pages, 4 figures. arXiv admin note: text overlap with arXiv:1910.02307, arXiv:1909.10299

We establish model independent bounds on the anomalous magnetic and electric dipole moments of the tau-lepton using the two-photon processes $����\to ��^+��^-$ and $����\to ��^+��^-��$. 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 $��_{sys}=0, 3, 5\hspace{1mm}\%$. Precise bounds at $95\%$ C. L. on the anomalous dipole moments to the tau-lepton $-0.00015\leq \tilde{a}_��\leq 0.00017$ and $|\tilde{d}_��(ecm)|=9.040\times 10^{-19}$ 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 $����$ mode., 38 pages, 26 figures

We conduce a study to probe the sensitivity of the process $e^+e^-\rightarrow (��, Z) \to ��_��\bar ��_����$ to the total cross section, the magnetic moment and the electric dipole moment of the tau-neutrino in a model-independent way. For this study, the beam polarization facility at the Compact Linear Collider (CLIC) along with the typical center-of-mass energies $\sqrt{s}=380-3000\hspace{0.8mm}GeV$ and integrated luminosities ${\cal L}=10-3000\hspace{0.8mm}fb^{-1}$ is considered. We estimate the sensitivity at the $95\%\hspace{1mm}$ Confidence Level (C.L.) and systematic uncertainties $��_{sys}=0, 5, 10\hspace{1mm}\%$ on the dipole moments of the tau-neutrino. It is shown that the process under consideration $e^+e^-\rightarrow (��, Z) \to ��_��\bar ��_����$ is a good prospect for study the dipole moments of the tau-neutrino at the CLIC. Also, our study illustrates the complementarity between CLIC and other $e^+e^-$ and $pp$ colliders in probing extensions of the Standard Model, and shows that the CLIC at high energy and high luminosity provides a powerful means to sensitivity estimates for the electromagnetic dipole moments of the tau-neutrino., 24 pages, 11 figures and 6 tables. arXiv admin note: text overlap with arXiv:1807.00238

To improve the theoretical prediction of the anomalous dipole moments of the $��$-neutrino, we have carried out a study through the process $��e^- \to ��\bar��_����_e$, which represents an excellent and useful option in determination of these anomalous parameters. To study the potential of the process $��e^- \to ��\bar��_����_e$, 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 $��_{sys}=0, 5, 10\%$. With these elements, we present a comprehensive and detailed sensitivity study on the total cross-section of the process $��e^- \to ��\bar��_����_e$, as well as on the dipole moments $��_{��_��}$ and $d_{��_��}$ at the $95\%$ C.L., showing the feasibility of such process at the CLIC at the $��e^-$ mode with unpolarized and polarized electron beams., 28 pages, 15 figures

We study the sensitivity for testing the anomalous triple gauge couplings $ZZ��$ and $Z����$ via the process $e^+e^-\to ��\bar����$ at high energy linear colliders. For integrated luminosities of 500 $fb^{-1}$ and center of mass energies between 0.5 and 1.5 $TeV$, we find that this process can provide tests of the triple neutral gauge boson couplings of order $10^{-4}$, one order of magnitude lower than the standard model prediction., 12 pages, 6 figures

We obtain bounds on the anomalous magnetic and electric dipole moments of the tau-neutrino through the reaction $e^{+}e^{-}\to ��\bar ����$ at the $Z_1$-pole in the framework of a Left-Right symmetric model and a class of $E_6$ inspired models with an additional neutral vector boson $Z_��$. We use the data collected by the L3 Collaboration at LEP. For the parameters of the $E_6$ model we consider the mixing angle $��_{E_6}=37.8^o$ and $M_{Z_��}=7M_{Z_1}$. We find that our bounds are of the same order of magnitude as those obtained in other extensions of the Standard Model., 17 pages, 2 figure

We study the triple Higgs self-coupling at future $e^{+}e^{-}$ colliders energies, with the reactions $e^{+}e^{-}\to b \bar b HH$ and $e^{+}e^{-}\to t \bar t HH$. We evaluate the total cross section of $b\bar bHH$, $t\bar tHH$ and calculate the total number of events considering the complete set of Feynman diagrams at tree-level. The sensitivity of the triple Higgs coupling is considered in the Higgs mass range 110-190 $GeV$, for the energy which is expected to be available at a possible Next Linear $e^{+}e^{-}$ Collider with a center-of-mass energy $800, 1000, 1500$ $GeV$ and luminosity 1000 $fb^{-1}$., 15 pages, 10 figures

We investigate the possibility of detecting the Higgs bosons predicted in the Minimal Supersymmetric extension of the Standard Model $(h^0, H^0, A^0, H^\pm)$, with the reactions $e^{+}e^{-}\to b\bar b h^0 (H^0, A^0)$, and $e^+e^-\to \tau^-\bar \nu_\tau H^+, \tau^+\nu_\tau H^-$, using the helicity formalism. We analyze the region of parameter space $(m_{A^0}-\tan\beta)$ where $h^0, H^0, A^0$ and $H^\pm$ could be detected in the limit when $\tan\beta$ is large. The numerical computation is done considering two stages of a possible Next Linear $e^{+}e^{-}$ Collider: the first with $\sqrt{s}=500$ $GeV$ and design luminosity 50 $fb^{-1}$, and the second with $\sqrt{s}=1$ $TeV$ and luminosity 100-200 $fb^{-1}$., Comment: 12 latex pages, 12 figures

WOS: 000462775700023, In this paper, we study the production of a top-quark in association with a bottom-quark and a electron-neutrino at the Future Circular Collider Hadron Electron (FCC-he) to probe the sensitivity on its magnetic moment ((a) over cap (V)) and its electromagnetic dipole moment ((a) over cap (A)) through the process e(-) p -> e(-) gamma p -> (t) over bart nu(e)bp. Assuming a large amount of collisions, as well as of data with cleaner environments, the FCC-he is an excellent option to study new physics, such as the (a) over cap (V) and (a) over cap (A). For our sensitivity study on (a) over cap (V) and (a) over cap (A), we consider center-of-mass energies root s = 7.07, 10 TeV and luminosities L = 50, 100, 300, 500, 1000 fb(-1). In addition, we apply systematic uncertainties delta(sys) = 0%, 3%, 5% and we consider unpolarized and polarized electron beam. Our results show that the FCC-he is a very good perspective to probe the (a) over cap (V) and (a) over cap (A) at high-energy and high-luminosity frontier. (C) 2019 The Author(s). Published by Elsevier B.V., Sistema Nacional de Investigadores (SNI); PROFOCIE (Mexico), A.G.R. and M.A.H.R. acknowledge support from Sistema Nacional de Investigadores (SNI) and PROFOCIE (Mexico).