arXiv subjects

Saleh Sultansoy

Publications and source records attributed to Saleh Sultansoy.

At least 19 recordsLinked to original sources

arXiv2026

Flavor Democracy Calls for Vector Like Leptons and Quarks

There are strong arguments favoring the Flavor Democracy hypothesis (or the Democratic Mass Matrix approach) within the Standard Model framework. However, the large mass of the top quark ($m_t >> m_b, m_τ$) poses an obstacle to the functioning of Flavor Democracy in the three SM family scenario. While a fourth Standard Model generation could have provided a natural resolution, this possibility is now almost entirely excluded by precision data on Higgs boson production and decay rates. The Flavor Democracy hypothesis can be elegantly resurrected through the introduction of Vector-Like Leptons (VLLs) and Vector-Like Quarks (VLQs), which naturally accommodate the observed fermion mass hierarchies while remaining consistent with current experimental constraints. Currently, experimental searches for VLLs conducted by the ATLAS and CMS collaborations rely on a highly constrained Restricted Model. This model imposes a mass degeneracy between charged and neutral VLLs within a doublet and assumes the absence of right-handed neutrinos. Consequently, current results are valid only for the restricted model and do not cover a more realistic, general scenario. Therefore, to accurately reflect the physical reality, it is imperative to conduct a comprehensive re-evaluation that incorporates all viable decay channels.

hep-ph↗

arXiv2024

Beyond Earthly Limits: Protection against Cosmic Radiation through Biological Response Pathways

The upcoming phase of space exploration not only includes trips to Mars and beyond, but also holds great promise for human progress. However, the harm caused by cosmic radiation, consisting of Galactic Cosmic Rays and Solar Particle Events, is an important safety concern for astronauts and other living things that will accompany them. Research exploring the biological effects of cosmic radiation includes experiments conducted in space itself and in simulated space environments on Earth. Notably, NASA's Space Radiation Laboratory has taken significant steps forward in simulating cosmic radiation by using particle accelerators and is currently pioneering the progress in this field. Curiously, much of the research emphasis thus far has been on understanding how cosmic radiation impacts living organisms, instead of finding ways to help them resist the radiation. In this paper, we briefly talk about current research on the biological effects of cosmic radiation and propose possible protective measures through biological interventions. In our opinion, biological response pathways responsible for coping with stressors on Earth can provide effective solutions for protection against the stress caused by cosmic radiation. We also recommend establishing the Dedicated International Accelerator Laboratory for Space Travel related radiation research (DIAL-ST) to advance this field and evaluate protective biological pathways through particle accelerator experiments simulating cosmic radiation.

physics.bio-ph↗

arXiv2024

μTRISTAN and LHC/Tevatron/FCC/SppC Based Antimuon-Hadron Colliders

Recently, the construction of {μ^+}{e^-} and {μ^+}{μ^+} colliders, μTRISTAN, at KEK has been proposed. We argue that the construction of a similar {μ^+} ring tangential to LHC/Tevatron/FCC/SppC will give an opportunity to realize {μ^+}p and {μ^+}A collisions at multi-TeV scale center-of-mass energies. In this paper the main parameters of proposed colliders have been studied. It is shown that sufficiently high luminosities can be achieved for all proposals under consideration: L exceeds {10^{33} cm^{-2}s^{-1}} for {μ^+}p colliders and {10^{30} cm^{-2}s^{-1}} for {μ^+}A colliders. Certainly, proposed colliders will provide huge potential for both SM (especially QCD basics) and BSM physics searches.

hep-ph↗

arXiv2024

Muon Ring and FCC-ee / CEPC Based Antimuon-Electron Colliders

Recently, the construction of an antimuon-electron collider, μTRISTAN, at KEK has been proposed. We argue that the construction of a similar muon ring tangential to FCC-ee and CEPC will give an opportunity to realize antimuon-electron collisions at higher center-of-mass energies. Moreover, the same ring may be used later to realize energy-frontier antimuon-proton colliders based on FCC-pp and SppC. Similarly, changing of electron ring in μTRISTAN project into proton ring will give opportunity to investigate lepton-hadron collisions at ~2 TeV center-of-mass energies. In this paper the main parameters of proposed colliders have been studied. It is shown that sufficiently high luminosities can be achieved for all proposals under consideration.

physics.acc-ph↗

arXiv2024

Two options for muon-proton collider at FNAL

We discuss a possibility to construct multi-TeV scale μp collider at FNAL. Main advantage of this project is existence of two ring tunnels tangential to each other. There are two possible options, namely, muons in main injector with protons in Tevatron ring and vice versa. Two choices are considered for center-of-mass energy values: 2.57 TeV using 8 T bending magnets and 5.10 TeV with 16 T magnets. It is shown that luminosity values exceeding 1033 cm-2s-1 can be achieved. It is obvious that μ-FNAL will provide unique potential for both SM (especially QCD basics) and BSM searches, far beyond the eRHIC and LHeC capacities.

physics.acc-ph↗

arXiv2023

The incompleteness of the experimental searches for vector-like leptons at CERN

There are strong phenomenological arguments favoring the existence of vector-like leptons and quarks in nature. In spite of extensive studies conducted in search of vector-like quarks, there are only a limited number of experimental studies on vector-like leptons. Moreover, these searches do not include all possible decay modes of vector-like leptons. Therefore, the analyses done so far are incomplete. In this letter, we highlight decay channels that are not covered by different experimental analyses, with a focus on L3, ATLAS, and CMS results. We argue that experimental analyses should be redone considering these shortcomings.

hep-ex↗

arXiv2022

Comment on $μp$ and $μA$ Luminosities of Muon-Ion Collider at BNL

Luminosities of muon-proton and muon-nucleus collisions at a recently proposed muon-ion collider (MuIC) at Brookhaven National Laboratory (BNL) in the USA have been estimated using A Luminosity Optimizer for High Energy Physics (AloHEP) software keeping in mind beam-beam tune-shift values. It is shown that L$_{μp}$ = 3.6x10$^{31}$ cm$^{-2}$s$^{-1}$ and L$_{μ{\rm -Au}}$ = 2.84x10$^{27}$ cm$^{-2}$s$^{-1}$ values can be achieved at MuIC. The physics search potential of the collider is superior to HERA. However, LHeC will provide 2 orders of higher luminosities at approximately same center-of-mass (CoM) energies.

physics.acc-ph↗

arXiv2022

Contact Interactions at Future Circular Collider based Muon-Proton Colliders

Recently proposed Future Circular Collider based muon-proton colliders will allow investigating lepton-hadron interactions at the highest center-of-mass energy. In this study, we investigate the potential of these colliders for a four-fermion contact interactions search. Regarding the constructive and destructive interferences of contact interactions, we estimated discovery, observation, and exclusion limits on the compositeness scale for the left-left, right-right, left-right, and right-left helicity structures. This study's findings show that the FCC-based μp colliders have great potential for investigating four-fermion contact interactions.

hep-ph↗

arXiv2022

Why should we search for vector-like leptons?

There are two strong arguments in favor of vector-like leptons and quarks: Flavor Democracy call for them, and E6 GUT predicts existence of iso-singlet quarks and iso-doublet leptons. Vector-like quarks (VLQ) are extensively searched by ATLAS and CMS collaborations, but this is not the case for vector-like leptons (VLL), while they have actually similar status from phenomenology viewpoint. In this study we argue that vector-like leptons should be included into the new physics search programs of energy-frontier colliders. We consider production of vector-like partners of the first SM family leptons at the HL-LHC, HE-LHC, FCC, ILC, CLIC, Muon Collider, as well as, at ep and μ-p colliders. As for decays of vector-like leptons, we present branching ratios formulas to different channels for the most general case. Since there are many different production and decay channels for charged and neutral vector-like leptons, relevant studies should be done systematically. We invite the High Energy Physics community (both experimenters and phenomenologists) to actively participate in research on this topic.

hep-ph↗

arXiv2022

Main Parameters of the MC and FCC/SppC/LHC/RHIC based Muon-Nucleus Colliders

Construction of future Muon Collider (or dedicated mu-ring) tangential to nucleus colliders will give opportunity to realize mu-A collisions at multi-TeV center of mass energies at a luminosity of order of 10^29-10^30 cm^-2s^-1. Obviously, such colliders will essentially enlighten fundamentals of strong interactions from quark to nucleus levels as well as clarify QCD basics. This paper is devoted to estimation of main parameters of the FCC, SppC, HL-LHC, HE-LHC and RHIC based muon-nucleus collider proposals by the software AloHEP.

physics.acc-ph↗

arXiv2022

Review of Muon-Proton Collider Proposals: Main Parameters

Construction of future Muon Collider (or dedicated mu-ring) tangential to the energy frontier pp colliders will give opportunity to realize mu-p collisions at multi-TeV center of mass energies at a luminosity of order of $10^{33}$ cm$^{-2}$s$^{-1}$ ($10^{34}$ cm$^{-2}$s$^{-1}$). Obviously, such colliders will essentially enlarge the physics search potential of corresponding muon and hadron colliders for both the SM (especially for clarifying QCD basics) and BSM phenomena. This paper is devoted to review of main parameters of mu-p colliders proposed until now.

physics.acc-ph↗

arXiv2021

A search for the first generation charged vector-like leptons at future colliders

Flavor Democracy Hypothesis favors existence of iso-singlet quarks and vector-like charged leptons. Their observation at future colliders could shed light on the nature of mass and mixing patterns of known leptons and quarks, as well as Higgs boson itself. Vector-like quarks are extensively searched by ATLAS and CMS collaborations. Unfortunately, this is not the case for vector-like leptons, while they have actually similar status from phenomenology viewpoint. We argue that vector-like charged leptons should be included into the new physics search programs of future energy frontier colliders. It is shown that pair production at the HE-LHC with decay of one of the leptons to Ze and another to He channel, followed by H \rightarrow bb and Z \rightarrow μμdecays will give opportunity to scan masses of iso-singlet and iso-doublet charged leptons up to 0.9 TeV and 1.5 TeV, respectively. FCC will extend this region up to 2 TeV for iso-singlet and 3.6 TeV for iso-doublet charged leptons.

hep-ph↗

arXiv2019

Scenarios for LHC/FCC Based Gamma-Proton Colliders

The advantage of the linac-ring type electron proton collider is that it allows for the straightforward construction of $γ$p collider. In a $γ$p collider high energy photons can be generated from Compton backscattering of laser photons off electrons from a linear accelerator. In this study main parameters of photon-proton colliders based on some future electron linear accelerator projects and protons supplied form LHC or FCC are evaluated.

physics.acc-ph↗

arXiv2019

A Search for R-Parity Violated Scalar Tau-neutrino ($\widetilde{ν_τ}$) at the Future Circular Collider

Future Circular Collider is one of the next generation energy-frontier proton-proton colliders with 100 TeV center of mass energy and promising very high luminosity. FCC will be an extraordinary machine for searching Beyond the Standard Model physics because of its very high center of mass energy and luminosity. Searching supersymmetric particles via R-parity violated interactions could be listed in promising BSM physics at the FCC. Scalar tau neutrino is one of the most interesting predictions. A search for $\widetildeν_τ$ neutrino decaying into $eμ$ final state via R-parity violated interactions has been conducted at the FCC-pp. It is seen from this research that FCC-pp will be able to discover $\widetildeν_τ$ up to 28.8 TeV, observe 32.0 TeV and exclude 34.5 TeV mass values by taking $λ_{311}^{\prime}=0.11$ and $λ_{312}=λ_{321}=0.07$ at $\mathcal{L}_{int}=17500\,fb^{-1}$. FCC-pp, also, will allow to examine very low values of the Yukawa coupling constants which cause R-parity violation interactions. It is obviously seen that FCC-pp will give an opportunity for detailed research on scalar tau neutrino production and decay via R-parity violated interactions.

hep-ph↗

arXiv2019

Search for Excited $u$ and $d$ Quarks in Dijet Final States at Future $pp$ Colliders

Resonant production of excited $u$ and $d$ quarks at the Future Circular Collider and Super proton-proton Collider have been researched. Dominant jet-jet decay mode has been considered. It is shown that FCC and SppC have great potential for discovery of excited $u$ ($d$) quark: up to 44.1 (36.3) and 58.4 (47.8) TeV masses, respectively. For degenerate case (M$_{u^{\star}}$ = M$_{d^{\star}}$), these values are 45.9 and 60.9 TeV, respectively. This discovery will also afford an opportunity to determine the compositeness scale up to multi-PeV level.

hep-ph↗

arXiv2019

Energy frontier lepton-hadron colliders, vector-like quarks and leptons, preons and so on

First of all, an importance of the LHC and FCC based energy frontier lepton-hadron and photon-hadron colliders is emphasised. Then arguments favoring existence of new heavy isosinglet down-type quarks and vector-like isosinglet or isodoublet leptons are presented, following by historical arguments favoring new (preonic) level of matter. The importance of Super-Charm factory and GeV energy proton linac for Turkey national road map is argued. Finally, several recommendations for ESPP2020 are suggested.

hep-ph↗

arXiv2018

The LHeC Project: e-Ring Revisited

Construction of a new 9 km long e-ring tangential to the LHC has been proposed as an option for QCD-Explorer stage of the LHeC. It is shown that L = 10^33 cm^-2s^-1 can be achieved with 90 MW synchrotron radiation losses.

physics.acc-ph↗

arXiv2018

Resonance Production of Excited u-quark at the FCC Based $γ$ $p$ Colliders

Several Beyond the Standard Model theories are proposed that fermions might have composite substructure. The existence of excited quarks is going to be the noticeable proof for the compositeness of Standard Model fermions. For this reason, excited quarks have been investigated by phenomenological and experimental high energy physicists at various collider options for the last few decades. The Future Circular Collider (FCC) has been recently planned as particle accelerator to be established at CERN. Beside the $\sqrt{s}$ = 100 TeV proton-proton collisions, the FCC includes electron-positron and electron-proton collision options. Construction of linear $e^- e^+$ colliders (or dedicated e-linac) tangential to the FCC will afford an opportunity to handle multi-TeV $ep$ and $γp$ collisions. In this respect, we executed a simulation of the resonance production of the excited $u$ quark at the FCC based $γp$ colliders with choosing both the polarized and unpolarized photon beams. The findings revealed that the chirality structure of the $q^*$-$q$-$γ$ vertex can be determined by the photon beam polarization. The attainable mass limits of the excited $u$ quark reached the highest values when the polarized photon beam was chosen. In addition, the ultimate compositeness scale values can be handled by appropriate choice of the photon beam polarization.

hep-ph↗