Digesh Raut

Dark Matter $Z^{'}$ and XENON1T Excess from $U (1)_{X}$ Extended Standard Model

Nobuchika Okada, Satomi Okada, Digesh Raut +1

A gauged $U (1)_{X}$ symmetry appended to the Standard Model (SM) is particularly well-motivated since it can account for the light neutrino masses by the seesaw mechanism, explain th…

Displaced vertex signature of type-I seesaw

Sudip Jana, Nobuchika Okada, Digesh Raut

A certain class of new physics models includes long-lived particles which are singlet under the Standard Model (SM) gauge group.A displaced vertex is a spectacular signature to pro…

Probing the seesaw mechanism at the 250 GeV ILC

Arindam Das, Nobuchika Okada, Satomi Okada +1

We consider a gauged U(1) $_{B - L}$ (Baryon-minus-Lepton number) extension of the Standard Model (SM), which is anomaly-free in the presence of three Right-Handed Neutrinos (RHNs). A…

Enhanced pair production of heavy Majorana neutrinos at LHC

Arindam Das, Nobuchika Okada, Digesh Raut

Towards experimental confirmations of the type-I seesaw mechanism, we explore a prospect of discovering the heavy Majorana right-handed neutrinos (RHNs) from a resonant production…

Monopoles, Exotic states and Muon $g - 2$ in TeV scale Trinification

Digesh Raut, Qaisar Shafi, Anil Thapa

We study the low energy implications of a trinification model based on the gauge symmetry $G = S U (3)_{c} \times S U (3)_{L} \times S U (3)_{R}$ , without imposing gauge coupling unification. A…

hep-ph2020

Inflection-Point Inflation with Axion Dark Matter in light of Trans-Planckian Censorship Conjecture

Nobuchika Okada, Digesh Raut, Qaisar Shafi

Motivated by the recently proposed Trans-Planckian Censorship Conjecture (TCC), we propose a gauged $B - L$ model of inflection-point inflation with axion dark matter. The Hubble sca…

Light $Z^{'}$ and Dirac fermion dark matter in the $B - L$ model

Newton Nath, Nobuchika Okada, Satomi Okada +2

We consider a $U (1)_{B - L}$ model with a $Z^{'}$ portal Dirac fermion dark matter (DM) $I ¨ $ of low mass which couples very weakly to the $B - L$ gauge boson $Z^{'}$ . An arbitr…

astro-ph.CO2024

Double Inflation in Classically Conformal $B - L$ Model

Anish Ghoshal, Nobuchika Okada, Arnab Paul +1

It has recently been shown in Ref. [1] that the double-inflation scenario based on the Coleman-Weinberg potential can successfully generate primordial black holes (PBHs) with the i…

Pseudo-Goldstone Dark Matter in gauged $B - L$ extended Standard Model

Nobuchika Okada, Digesh Raut, Qaisar Shafi

Gauging the global $B - L$ (Baryon number minus Lepton number) symmetry in the Standard Model (SM) is well-motivated since anomaly cancellations require the introduction of three rig…

hep-ph2017

Inflection-point Higgs Inflation

Nobuchika Okada, Digesh Raut

Inflection-point inflation is an interesting possibility to realize a successful slow-roll inflation when inflation is driven by a single scalar field with its initial value below…

hep-ph2015

Running Non-Minimal Inflation with Stabilized Inflaton Potential

Nobuchika Okada, Digesh Raut

In the context of the Higgs model involving gauge and Yukawa interactions with the spontaneous gauge symmetry breaking, we consider $I^» I ¨ ^{4}$ inflation with non-minimal gravitationa…

Heavy Majorana neutrino pair productions at the LHC in minimal U(1) extended Standard Model

Arindam Das, Nobuchika Okada, Digesh Raut

In our recent paper [1], we explored a prospect of discovering the heavy Majorana right-handed neutrinos (RHNs) at the future LHC in the context of the minimal non-exotic U(1) exte…

hep-ph2025

Analytic formulation of Leptogenesis with neutrino oscillation data employing the general parametrization for neutrino mass matrix

Nobuchika Okada, Digesh Raut

The observed neutrino oscillations and baryon asymmetry, unexplained by the Standard Model (SM), can both be accounted for by extending the SM to include Majorana right-handed neut…

hep-ph2025

Nambu-Goldstone boson phenomenology in Domain-Wall Standard Model

Puja Das, Nobuchika Okada, Digesh Raut +1

We investigate the Domain-Wall Standard Model (DWSM), a five-dimensional framework in which all Standard Model (SM) particles are localized on a domain wall embedded in a non-compa…

Hunting Inflaton at FASER

Nobuchika Okada, Digesh Raut

We explore a possibility that an inflaton, which drives the cosmological inflation in the early Universe, can be detected by the recently approved FASER at the High-Luminosity LHC…

physics.ed-ph2025

Dangerous Questions in Astronomy Education

Michael Fitzgerald, Rachel Freed, Dan Reichart +63

As astronomy enters an era defined by global telescope networks, petabyte-scale surveys, and powerful computational tools, the longstanding goals of astronomy education, particular…

Pseudo-Goldstone Dark Matter in $S O (10)$

Nobuchika Okada, Digesh Raut, Qaisar Shafi +1

We propose a pseudo-Goldstone boson dark matter (pGDM) particle in $S O (10)$ grand unified theory (GUT). Due to its Goldstone nature, this pGDM evades the direct DM detection experi…

Domain-Wall Standard Model in non-compact 5D and LHC phenomenology

Nobuchika Okada, Digesh Raut, Desmond Villalba

We propose a framework to construct "Domain-Wall Standard Model" in a non compact 5-dimensional space-time, where all the Standard Model (SM) fields are localized in certain domain…

Axions, WIMPs, proton decay and observable $r$ in $S O (10)$

Nobuchika Okada, Digesh Raut, Qaisar Shafi

We explore some experimentally testable predictions of an $S O (10)$ axion model which includes two 10-plets of fermions in order to resolve the axion domain wall problem. The axion…

The Forward Physics Facility: Sites, Experiments, and Physics Potential

Luis A. Anchordoqui, Akitaka Ariga, Tomoko Ariga +78

The Forward Physics Facility (FPF) is a proposal to create a cavern with the space and infrastructure to support a suite of far-forward experiments at the Large Hadron Collider dur…

hep-ph2020

SMART U(1) $_{X}$ $-$ Standard Model with Axion, Right handed neutrinos, Two Higgs doublets and U(1) $_{X}$ gauge symmetry

Nobuchika Okada, Digesh Raut, Qaisar Shafi

To address five fundamental shortcomings of the Standard Model (SM) of particle physics and cosmology, we propose a SMART U(1) $_{X}$ model which is a $U (1)_{X} \times U (1)_{P Q}$ extens…

hep-ph2017

Inflection-point inflation in hyper-charge oriented U(1) $_{X}$ model

Nobuchika Okada, Satomi Okada, Digesh Raut

Inflection-point inflation is an interesting possibility to realize a successful slow-roll inflation when inflation is driven by a single scalar field with its value during inflati…

Fermion Mass Hierarchy and Phenomenology in the 5D Domain Wall Standard Model

Nobuchika Okada, Digesh Raut, Desmond Villalba

We have recently proposed a setup of the "Domain-Wall Standard Model" in 5D spacetime, where all the Standard Model (SM) fields are localized in certain domains of the extra 5th di…

SU(5) $\times$ U(1) $_{X}$ grand unification with minimal seesaw and $Z^{'}$ -portal dark matter

Nobuchika Okada, Satomi Okada, Digesh Raut

We propose a grand unified SU(5) $\times$ U(1) $_{X}$ model, where the standard SU(5) grand unified theory is supplemented by minimal seesaw and a right-handed neutrino dark matter with…

Displaced Vertex and Disappearing Track Signatures in type-III Seesaw

Sudip Jana, Nobuchika Okada, Digesh Raut

We investigate a prospect of probing the type-III seesaw neutrino mass generation mechanism at various collider experiments by searching for a disappearing track and a displaced ve…

Inflation, Proton Decay, and Higgs-Portal Dark Matter in $S O (10) \times U (1)_{I ¨} $

Nobuchika Okada, Digesh Raut, Qaisar Shafi

We propose a simple non-supersymmetric grand unified theory (GUT) based on the gauge group $S O (10) \times U (1)_{I ¨} $ . The model includes 3 generations of fermions in $16$ ( $+ 1$ …

hep-ex2022

The Forward Physics Facility at the High-Luminosity LHC

Jonathan L. Feng, Felix Kling, Mary Hall Reno +233

High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing L…

hep-ph2023

Aspects of Domain-Wall Standard Model

Nobuchika Okada, Digesh Raut, Desmond Villalba

We have recently proposed a setup of the "Domain-Wall Standard Model" in a non-compact 5-dimensional space-time, where all the Standard Model (SM) fields are localized in certain d…

A natural $Z^{'}$ -portal Majorana dark matter in alternative U(1) extended Standard Model

Nobuchika Okada, Satomi Okada, Digesh Raut

We consider a non-exotic gauged U(1) $_{X}$ extension of the Standard Model (SM), where the U(1) $_{X}$ charge of a SM field is given by a linear combination of its hypercharge and Baryo…

hep-ph2023

Higgs-Portal Dark Matter in Brane-World Cosmology

Taoli Liu, Nobuchika Okada, Digesh Raut

The Higgs-portal scalar dark matter (DM) model is a simple extension of the Standard Model (SM) to incorporate a DM particle to the SM, where a $Z_{2}$ -odd real scalar field is intro…

Non-minimal quartic inflation in classically conformal U(1) $_{X}$ extended Standard Model

Satsuki Oda, Nobuchika Okada, Digesh Raut +1

We propose quartic inflation with non-minimal gravitational coupling in the context of the classically conformal U(1)_X extension of the SM. In this model, the U(1)_X gauge symmetr…

hep-ph2023

Type III seesaw with R-parity violation in light of $m_{W}$ (CDF)

Anish Ghoshal, Nobuchika Okada, Satomi Okada +3

Motivated by the recently reported measurement of the $W$ boson mass $M_{W} = 80.4335 \pm 0.0094$ GeV by the CDF collaboration, we propose a type III seesaw extension of the minimal…