Anomalous Wtb couplings in ?p collision at the LHC

We study the possibility for the process pp›p?p›pW -t(W +t¯)X with anomalous Wtb couplings in a model-independent effective Lagrangian approach at the LHC. We find 95% confidence level bounds on the anomalous coupling parameters for various values of the integrated luminosity. The improved constraints on the anomalous Wtb couplings have been obtained compared to current limits. © 2012 American Physical Society.Japan Society for the Promotion of Science: 2110500

Bounds on the non-standard W+W−γW^+W^-\gamma couplings at the LHeC and the FCC-he

We examine the potential of the e−p→e−γ⁎p→e−W−q′X ( γ⁎ is the Weizsacker-Williams 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). Using the effective Lagrangian approach with various values of the center-of-mass energy and integrated luminosity, we find 95% confidence level bounds on the anomalous coupling Δκγ and λγ parameters. We assume center-of-mass energies of the electron-proton system s=1.30,1.98,7.07,10 TeV and luminosities L=10−1000 fb−1 . The best limits obtained from the process e−p→e−γ⁎p→e−W−q′X on the anomalous Δκγ and λγ couplings are Δκγ=|0.00069| and λγ=[−0.0099,0.0054] . These bounds show that the process under consideration is a very promising option to probe the non-standard Δκγ and λγ couplings at the LHeC and the FCC-he. Our results also provide complementary information on other results for Δκγ and λγ couplings.We examine the potential of the $e^-p \to e^-\gamma^*p \to e^-W^-q'X$ ($\gamma^*$ is Weizsacker-Willams photon) reaction to probe the non-standard $W^+W^-\gamma$ 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 $\Delta\kappa_\gamma$ and $\lambda_\gamma$ 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 $e^-p \to e^-\gamma^*p \to e^-W^-q'X$ on the anomalous $\Delta\kappa_\gamma$ and $\lambda_\gamma$ couplings are $\Delta\kappa_\gamma = |0.00069|$ and $\lambda_\gamma = [-0.0099, 0.0054]$. These bounds show that the process under consideration is a good prospect for the searching of the non-standard $\Delta\kappa_\gamma$ and $\lambda_\gamma$ couplings at the LHeC and the FCC-he. In addition, our results provide complementary information on other results for $\Delta\kappa_\gamma$ and $\lambda_\gamma$ couplings

FCC-he sensitivity estimates on the anomalous electromagnetic dipole moments of the top-quark

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 (aˆV) and its electromagnetic dipole moment (aˆA) through the process e−p→e−γp→t¯νebp. 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 aˆV and aˆA. For our sensitivity study on aˆV and aˆA, we consider center-of-mass energies s=7.07,10 TeV and luminosities L=50,100,300,500,1000 fb−1. In addition, we apply systematic uncertainties δsys=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 aˆV and aˆA at high-energy and high-luminosity frontier

Analysis of the anomalous electromagnetic moments of the tau lepton in γ p collisions at the LHC

In this study, we investigate the potential of the process pp?p??p?p??¯?q?X at the LHC to examine the anomalous electromagnetic moments of the tau lepton. We obtain 95% confidence level bounds on the anomalous coupling parameters with various values of the integrated luminosity and center-of-mass energy. The improved bounds have been obtained on the anomalous coupling parameters of electric and magnetic moments of the tau lepton a? and |d?| compared to the current experimental sensitivity bounds. The ?p mode of photon reactions at the LHC have shown that it has great potential for the electromagnetic dipole moments studies of the tau lepton. © 2018 The Authors115F136This work has been supported by the Scientific and Technological Research Council of Turkey (TUBITAK) in the framework of Project No. 115F136

Graviton production through photon-quark scattering at the LHC

We have investigated real graviton emission in the Arkani-Hamed-Dimopoulos-Dvali (ADD) and Randall-Sundrum (RS) models of extra dimensions through the photoproduction process pp›p?p›pGqX at the LHC. We have considered all contributions from the subprocesses ?q›Gq, where q=u,d,c,s,b,u¯,d¯,c¯,s¯,b¯ quark. The constraints on model parameters of the ADD and RS models of extra dimensions have been calculated. During numerical calculations we have taken into account 3, 4, 5, and 6 large extradimensional scenarios. The constraints on RS model parameters have been calculated by considering G›??, ee¯, µµ¯ decay channels of the graviton. © 2015 American Physical Society

Probe of extra dimensions in ?q›?q at the LHC

We have examined TeV scale effects of extra spatial dimensions through the processes ?q›?q, where q=u, d, c, s, b, u, d¯, c¯, s¯, b¯. These processes have been treated in a photon-proton collision via the main reaction pp›p?p›p?qX at the LHC. We have employed the equivalent photon approximation for incoming photon beams and performed statistical analysis for various forward detector acceptances. © 2013 American Physical Society