57 citations · 540 across the 44 of their papers we have counts for
35 papers · 1 filter
W-boson helicity fractions in top decay as probes of dimension-6 and dimension-8 SMEFT operators
Afsaneh Kianfar, Gholamhossein Haghighat, Mojtaba Mohammadi Najafabadi
Precision measurements of top-quark decays provide powerful probes of physics beyond the Standard Model (SM). While the impact of dimension-6 operators in the SM Effective Field Th…
Exploring Axion-Like Particle Couplings through Single Top -Channel and Top Pair Production at the LHC
Yasaman Hosseini, Mojtaba Mohammadi Najafabadi
In this paper, we explore the interactions between light axion-like particles (ALPs) and top quarks, gluons, and W-bosons. Utilizing high-energy probes at the LHC, we probe these c…
Prospect study for measurement of coupling at the LHC and FCC-hh
Zahra Abdy, Mojtaba Mohammadi Najafabadi
This paper employs the signature in proton-proton collisions to explore the structure of the couplings.The focus of the analysis lies in the decay of…
Exploring non-standard interactions at future electron-proton colliders
Gholamhossein Haghighat, Reza Jafari, Hamzeh Khanpour +1
In this paper, we use the charged-current Higgs boson production process at future electron-proton colliders, , with the subsequent decay of the Higgs boson into…
Probing a light dark sector at future lepton colliders via invisible decays of the SM-like and dark Higgs bosons
Gholamhossein Haghighat, Mojtaba Mohammadi Najafabadi, Kodai Sakurai +1
A renormalizable UV model for Axion-Like Particles (ALPs) or hidden photons, that may explain the dark matter usually involves a dark Higgs field which is a singlet under the stand…
Prospects for probing axionlike particles at a future hadron collider through top quark production
Yasaman Hosseini, Mojtaba Mohammadi Najafabadi
Axionlike particles (ALPs) emerge from spontaneously broken global symmetries in high energy extensions of the Standard Model (SM). This causes ALPs to be among the objectives of f…
Search for lepton-flavor-violating decays of the tau lepton at a future muon collider
Gholamhossein Haghighat, Mojtaba Mohammadi Najafabadi
Tau leptons can have lepton-flavor-violating (LFV) couplings to a muon or an electron and an Axion-Like Particle (ALP). ALPs are pseudo Nambu-Goldstone bosons associated with spont…
Unitarity Constraints and Collider Searches for Dark Photons
Yasaman Hosseini, Mojtaba Mohammadi Najafabadi
Dark photons are predicted by various new physics models, and are being intensively studied in a variety of experiments. In the first part of this paper, we obtain partial wave uni…
Searching for lepton flavor violating interactions at future electron-positron colliders
S. M. Etesami, R. Jafari, M. Mohammadi Najafabadi +1
Lepton flavor violating interactions are absent in the standard model but are expected in various beyond standard models. In this work, the potential of the future circular electro…
Search for lepton-flavor-violating ALPs at a future muon collider and utilization of polarization-induced effects
Gholamhossein Haghighat, Mojtaba Mohammadi Najafabadi
Axion-Like Particles (ALPs) are pseudo Nambu-Goldstone bosons associated with spontaneously broken global symmetries. Such particles can have lepton-flavor-violating (LFV) c…
Beyond the Standard Model Physics at the HL-LHC and HE-LHC
X. Cid Vidal, M. D'Onofrio, P. J. Fox +294
This is the third out of five chapters of the final report [1] of the Workshop on Physics at HL-LHC, and perspectives on HE-LHC [2]. It is devoted to the study of the potential, in…
Study of top quark dipole interactions in production associated with two heavy gauge bosons at the LHC
Seyed Mohsen Etesami, Sara Khatibi, Mojtaba Mohammadi Najafabadi
In this paper, we investigate the prospects of measuring the strong and weak dipole moments of the top quark at the Large Hadron Collider (LHC). Measurements of these couplings pro…
Probing Higgs boson couplings in H+ production at the LHC
Hamzeh Khanpour, Sara Khatibi, Mojtaba Mohammadi Najafabadi
In this paper, we examine the potential of Higgs boson production associated with a photon at the LHC to probe the new physics effects in the framework of the standard model effect…
Constraining the monochromatic gamma-rays from dark matter annihilation by the LHC
Arman Esmaili, Sara Khatibi, Mojtaba Mohammadi Najafabadi
The installation of forward detectors in CMS and ATLAS turn the LHC to an effective photon-photon collider. The elastic scattering of the beam-protons via the emission of photons,…
Exploring anomalous couplings in -proton collisions at the LHC
S. Taheri Monfared, Sh. Fayazbakhsh, M. Mohammadi Najafabadi
The coupling, which is highly sensitive to the new physics beyond the standard model, is studied through the process at the LHC. To this pu…
Measuring anomalous WW and t couplings using top+ production at the LHC
Seyed Mohsen Etesami, Sara Khatibi, Mojtaba Mohammadi Najafabadi
We consider the electroweak production of a top quark in association with a photon at the LHC to probe the electroweak top quark couplings (t) as well as the tripl…
Constraints on top quark flavor changing neutral currents using diphoton events at the LHC
Sara Khatibi, Mojtaba Mohammadi Najafabadi
In this paper we show that the diphoton mass spectrum in proton-proton collisions at the LHC is sensitive to the top quark flavor changing neutral current in the vertices of …
Direct and Indirect Searches for Top-Higgs FCNC Couplings
Hoda Hesari, Hamzeh Khanpour, Mojtaba Mohammadi Najafabadi
Large top quark flavor changing through neutral currents is expected by many extensions of the standard model. Direct and indirect searches for flavor changing neutral currents (FC…
Double Higgs Production with a Jet Substructure Analysis to Probe Extra Dimensions
Seyed Mohsen Etesami, Mojtaba Mohammadi Najafabadi
In this paper, we perform a comprehensive study to probe the effects of large extra dimensions through double Higgs production in proton-proton collisions at the center-of-mass ene…
Exploring the Anomalous Higgs-top Couplings
Sara Khatibi, Mojtaba Mohammadi Najafabadi
Top quark with its large Yukawa coupling is crucially important to explore TeV scale physics. Therefore, the study of Higgs-top sector is highly motivated to look for any deviation…
Single top quark production as a probe of anomalous and couplings at the FCC-ee
Hamzeh Khanpour, Sara Khatibi, Morteza Khatiri Yanehsari +1
In this paper, a detailed study to probe the top quark Flavour-Changing Neutral Currents (FCNC) and at the future collider FCC-ee in three different center…
Direct photon production as a probe of quarks chromoelectric and chromomagnetic dipole moments at the LHC
Hoda Hesari, Mojtaba Mohammadi Najafabadi
In this paper we show that the jet invariant mass distribution in proton-proton collisions at the LHC is significantly sensitive to the quarks chromoelectric () and chromoma…
Probing the Anomalous FCNC Interactions in Top-Higgs Final State and Charge Ratio Approach
Sara Khatibi, Mojtaba Mohammadi Najafabadi
We study the anomalous production of a single top quark in association with a Higgs boson at the LHC originating from flavor changing neutral current (FCNC) interactions in a…
From Tevatron's top and lepton-based asymmetries to the LHC
Adrian Carmona, Mikael Chala, Adam Falkowski +4
We define a lepton-based asymmetry in semi-leptonic ttbar production at the LHC. We show that the ratio of this lepton-based asymmetry and the ttbar charge asymmetry, measured as a…