18 citations · 41 across the 13 of their papers we have counts for
14 papers
A Narrow Neutrino Window for the LZ Event
Vedran Brdar, Dibya S. Chattopadhyay
The LUX-ZEPLIN (LZ) experiment has reported an event consistent with a keV nuclear recoil. Explaining the absence of lower-energy recoil events typically calls for some form…
Four, One, and None: Quantifying the Ultra-High-Energy Neutrino Anomaly Across ANITA-IV, KM3NeT, and IceCube
Dibya S. Chattopadhyay, Carlos A. Argüelles, Vedran Brdar
The four near-horizon neutrino-like events reported by ANITA-IV and the ultra-high-energy track-like event KM3-230213A observed by KM3NeT imply neutrino event rates that are in ten…
Ruling Out Spiky WIMP Dark Matter using Indirect Searches
Dibya S. Chattopadhyay, P. S. Bhupal Dev, Yago Porto
The dark matter (DM) density profile in the innermost region of the Galaxy remains an open question. In particular, while adiabatic growth of the supermassive black hole Sgr A$^\as…
Exploring Quantumness at Long-Baseline Neutrino Experiments
Murshed Alam, Vedran Brdar, Dibya S. Chattopadhyay
Violations of classicality can be probed through measurements performed on a system at different times, as proposed by Leggett and Garg. Specifically, violations of Leggett-Garg in…
Prospects for Neutrino Observation and Mass Measurement from Binary Neutron Star Mergers
Vedran Brdar, Dibya S. Chattopadhyay, Samiur R. Mir +2
Over the next decade, diffuse supernova neutrino background (DSNB) events are expected in Hyper-Kamiokande. Another neutrino source that has received far less at…
Neutron Star Eclipses as Axion Laboratories
Vedran Brdar, Dibya S. Chattopadhyay
In light-shining-through-walls experiments, axions and axion-like particles (ALPs) are searched for by exposing an optically thick barrier to a laser beam. In a magnetic field, pho…
Does the 220 PeV Event at KM3NeT Point to New Physics?
Vedran Brdar, Dibya S. Chattopadhyay
The KM3NeT collaboration recently reported the observation of KM3-230213A, a neutrino event with an energy exceeding 100 PeV, more than an order of magnitude higher than the most e…
Neutrino Oscillations in Presence of Diagonal Elements of Scalar NSI: An Analytic Approach
Dharitree Bezboruah, Dibya S. Chattopadhyay, Abinash Medhi +2
Scalar Non-Standard Interactions (SNSI) in neutrinos can arise when a scalar mediator couples to both neutrinos and standard model fermions. This beyond the Standard Model (BSM) sc…
Cosmological selection of a small weak scale from large vacuum energy: a minimal approach
Susobhan Chattopadhyay, Dibya S. Chattopadhyay, Rick S. Gupta
We present a minimal cosmological solution to the hierarchy problem. Our model consists of a light pseudoscalar and an extra Higgs doublet in addition to the field content of the S…
Light Shining Through Wall Bounds on Axions From Obscured Magnetars
Dibya S. Chattopadhyay, Basudeb Dasgupta, Amol Dighe +1
Coupling of axions or axion-like particles (ALPs) with photons may lead to photons escaping optically opaque regions by oscillating into ALPs. This phenomenon may be viewed as the…
Quantum mismatch: a powerful measure of "quantumness" in neutrino oscillations
Dibya S. Chattopadhyay, Amol Dighe
The quantum nature of neutrino oscillations would be reflected in the mismatch between the neutrino survival probabilities with and without an intermediate observation. We propose…
Sterile Neutrinos: Propagation in Matter and Sensitivity to Sterile Mass Ordering
Dibya S. Chattopadhyay, Moon Moon Devi, Amol Dighe +3
We analytically calculate the neutrino conversion probability in the presence of sterile neutrinos, with exact dependence on and with matter effects explicitly…
Analytic treatment of 3-flavor neutrino oscillation and decay in matter
Dibya S. Chattopadhyay, Kaustav Chakraborty, Amol Dighe +1
We present compact analytic expressions for 3-flavor neutrino oscillation probabilities with invisible neutrino decay, where matter effects have been explicitly included. We take i…
Neutrino propagation when mass eigenstates and decay eigenstates mismatch
Dibya S. Chattopadhyay, Kaustav Chakraborty, Amol Dighe +2
We point out that the Hermitian and anti-Hermitian components of the effective Hamiltonian for decaying neutrinos cannot be simultaneously diagonalized by unitary transformations f…