Monojit Ghosh

Monojit Ghosh

Ruđer Bošković Institute
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Monojit Ghosh has a total of 792 co-authors. Here are the top co-authors by number of shared publications:

Latest Publications

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    Study of Supernova Neutrinos at ESSnuSB

    by J. Aguilar, M. Anastasopoulos, D. Barčot, E. Baussan, A. K. Bhattacharyya, A. Bignami, M. Blennow, M. Bogomilov, B. Bolling, E. Bouquerel, et al.

    In this paper, we have studied the sensitivity of the ESSnuSB far detector to supernova neutrinos. ESSnuSB is a proposed long-baseline neutrino experiment in Sweden, which will use a 538 kt water Cherenkov detector to probe the leptonic phase δCP by studying the second oscillation maximum. However, given the very large detector volume, it will have an excellent sensitivity to supernova neutrinos if a supernova explosion occurs during the run-time of ESSnuSB. Motivated by this, we first estimate the expected event rates at the ESSnuSB far detector for three different supernova flux models and then we probe its capability to distinguish these flux models. Additionally, we also investigate the impact of systematic errors and detector efficiency. Our results show that depending on the model of the supernova neutrinos, the expected number of events detected at Earth varies significantly. Our results also show that the ESSnuSB far detector may have excellent potential in distinguishing these flux models depending upon the distance of the supernova explosion, systematic errors and detector efficiency.

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    Probing non-unitarity of the PMNS matrix in P2SO and comparison with DUNE

    by Sambit Kumar Pusty, Samiran Roy, Monojit Ghosh, Rukmani Mohanta

    A bstract: We compare the sensitivity of the upcoming long-baseline neutrino experiments Protvino to Super-ORCA (P2SO) and the Deep Underground Neutrino Experiment (DUNE) to non-unitarity (NU) of the leptonic mixing matrix in a model-independent framework. NU can arise in theories beyond the Standard Model that include heavy neutral leptons. These effects can modify neutrino oscillation probabilities and introduce new sources of CP violation, which may affect precision measurements of neutrino parameters. We find that DUNE provides stronger bounds on α 11 and | α 21 |, while P2SO shows better sensitivity to α 22 and α 33 , mainly due to its longer baseline and stronger matter effects. Our results show that DUNE (P2SO) will be able to improve the current bounds of α 11 ( α 33 ). We further examine correlations with standard oscillation parameters and quantify the impact of NU on mass hierarchy, octant, and CP-violation sensitivities. Our results show that these sensitivities depend upon NU in a non-trivial way interconnecting the parameter degeneracies and matter effects. Our results demonstrate the complementarity of P2SO and DUNE in probing NU and show that NU can significantly influence next-generation precision oscillation studies.

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    Searching non-standard interactions with atmospheric neutrinos at ESSnuSB

    by J. Aguilar, M. Anastasopoulos, D. Barčot, E. Baussan, A. K. Bhattacharyya, A. Bignami, M. Blennow, M. Bogomilov, B. Bolling, E. Bouquerel, et al.

    A bstract: Atmospheric neutrinos provide a unique avenue to study neutrino interactions in matter. In this work, the prospects of constraining non-standard neutrino interactions with atmospheric neutrino oscillations are investigated for the proposed ESSnuSB far detector. By analyzing atmospheric neutrino samples equivalent to 5.4 Mt·year exposure, it is found that ESSnuSB could be able to set the upper bounds $$ \mid {\epsilon}_{e\mu}^m\mid <0.053 $$ ∣ ϵ eμ m ∣ < 0.053 , $$ \mid {\epsilon}_{e\tau}^m\mid <0.057 $$ ∣ ϵ eτ m ∣ < 0.057 , $$ \mid {\epsilon}_{\mu \tau}^m\mid <0.021 $$ ∣ ϵ μτ m ∣ < 0.021 , $$ {\epsilon}_{ee}^m-{\epsilon}_{\mu \mu}^m<0.075 $$ ϵ ee m − ϵ μμ m < 0.075 and $$ \mid {\epsilon}_{\tau \tau}^m-{\epsilon}_{\mu \mu}^m\mid <0.031 $$ ∣ ϵ ττ m − ϵ μμ m ∣ < 0.031 at 90% CL, when the results are minimized for $$ {\phi}_{e\mu}^m $$ ϕ eμ m , $$ {\phi}_{e\tau}^m $$ ϕ eτ m and $$ {\phi}_{\mu \tau}^m $$ ϕ μτ m and normal ordering is assumed for neutrino masses. It is also shown that the presence of non-standard interactions could affect the sensitivities to neutrino mass ordering and θ 23 octant in comparison to the standard interaction scheme. The results of this work highlight the complementarity between atmospheric and accelerator neutrino programs in ESSnuSB.

    Cited by 1
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    Physics with Next Generation Neutrino Experiments: ESSnuSB

    by M. Ghosh

    In this contribution, we explore the physics potential of the ESSnuSBplus setup to study beam- and non-beam-based physics scenarios in both standard and New Physics cases. The ESSnuSBplus setup consists of three neutrino sources: the main ESS linac, a low-energy monitored neutrino beam, and a low-energy nuSTORM facility and three detectors: the main far detector and two near detectors. The goal of this facility is to measure the leptonic CP phase with extremely high precision and the neutrino–nucleus cross section in the few-hundred-MeV region. Published by the Jagiellonian University 2026 authors

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    Physics with next generation neutrino experiments: ESSnuSB

    by E S Snu S B, Monojit Ghosh

    In this proceedings we explore the physics potential of the ESSnuSBplus setup to study beam and non-beam based physics scenarios in both standard and new physics cases. The ESSnuSBplus setup consists of three neutrino sources: the main ESS linac, a low energy monitored neutrino beam and a low energy nuSTORM facility and three detectors: the main far detector and two near detectors. The goal of this facility is to measure the leptonic CP phase with extremely high precision and the neutrino nucleus cross-section in the few hundred MeV region.

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    Impact of scalar NSI with off-diagonal parameters at DUNE and P2SO

    by Sambit Kumar Pusty, Rudra Majhi, Dinesh Kumar Singha, Monojit Ghosh, Rukmani Mohanta

    In this paper, we studied the impact of the off-diagonal SNSI parameters in the future long-baseline neutrino oscillation experiments DUNE and P2SO. In our analysis, we found that the sensitivities of these experiments altered in a very non-trivial way due to the presence of these parameters. Depending on the values of these parameters, they can either completely mimic the standard scenario or can wash out their CP sensitivity. For large values of parameters $$\eta _{e\mu }$$ η e μ and $$\eta _{e\tau }$$ η e τ , we obtained larger mass ordering and octant sensitivities as compared to the standard three flavour scenario. For the parameter $$\eta _{\mu \tau }$$ η μ τ , the mass ordering sensitivity and the precision of $$\Delta m^2_{31}$$ Δ m 31 2 deteriorated compared to the standard scenario. Our results also showed that the sensitivities were significantly influenced by the phases of the off-diagonal parameters.

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    Probing long-range forces in neutrino oscillations at the ESSnuSB experiment

    by J. Aguilar, M. Anastasopoulos, D. Barčot, E. Baussan, A. K. Bhattacharyya, A. Bignami, M. Blennow, M. Bogomilov, B. Bolling, E. Bouquerel, et al.

    A bstract: Neutrino oscillations constitute an excellent tool to probe physics beyond the Standard Model. In this paper, we investigate the potential of the ESSnuSB experiment to constrain the effects of flavour-dependent long-range forces (LRFs) in neutrino oscillations, which may arise due to the extension of the Standard Model gauge group by introducing new U(1) symmetries. Focusing on three specific U(1) symmetries — L e − L μ , L e − L τ , and L μ − L τ , we demonstrate that ESSnuSB offers a favourable environment to search for LRF effects. Our analyses reveal that ESSnuSB can set 90% confidence level bounds of V eμ < 2.99 × 10 − 14 eV, V eτ < 2.05 × 10 − 14 eV, and V μτ < 1.81 × 10 − 14 eV, which are competitive to the upcoming Deep Underground Neutrino Experiment (DUNE). It is also observed that reducing the systematic uncertainties from 5% to 2% improves the ESSnuSB limits on V αβ . Interestingly, we find limited correlations between LRF parameters and the less constrained lepton mixing parameters θ 23 and δ CP , preserving the robustness of ESSnuSB’s sensitivity to CP violation. Even under extreme LRF potentials ( V αβ ≫ 10 − 13 eV), the CP-violation sensitivity and δ CP precision remain largely unaffected. These results establish ESSnuSB as a competitive experimental setup for probing LRF effects, complementing constraints from other neutrino sources and offering critical insights into the physics of long-range forces.

    Cited by 2
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    Study of Large Extra Dimension and neutrino decay at P2SO experiment

    by Papia Panda, Priya Mishra, Samiran Roy, Monojit Ghosh, Rukmani Mohanta

    In this study, we explore two intriguing new physics scenarios: the theory of Large Extra Dimensions (LED) and the theory of neutrino decay. We analyze the impact of LED on neutrino oscillations in the contexts of Protvino to Super-ORCA (P2SO), DUNE, and T2HK, with a particular emphasis on P2SO. In contrast, the effects of neutrino decay are examined exclusively in the context of P2SO. For the LED scenario, we find that combining data from P2SO, DUNE, and T2HK can yield tighter constraints than current bounds, but only if all oscillation parameters are measured with high precision. In the case of neutrino decay, P2SO can achieve slightly better bounds compared to ESSnuSB and MOMENT, although its bounds remain weaker than those provided by DUNE and T2HK. Regarding sensitivities to unresolved oscillation parameters, the existence of LED has a minimal impact on the determination of CP violation, mass ordering and octant. However, neutrino decay can significantly influence the sensitivities related to CP violation and octant in a non-trivial manner.

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    Quantum Decoherence at ESSnuSB Experiment

    by Monojit Ghosh, ESSnuSB collaboration

    In this proceedings we study the sensitivity of the ESSnuSB experiment to probe quantum decoherence. ESSnuSB is a future long-baseline neutrino oscillation experiment which aims to measure $\delta_{\rm CP}$ by probing the second oscillation maximum. Using the open quantum system formalism for decoherence, we have shown that the sensitivity of ESSnuSB to constrain the decoherence parameters is better than MINOS but comparable to DUNE. We have also shown that the CP measurement capability of ESSnuSB is robust in presence of decoherence.

    Cited by 4
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    Effect of torsion in long-baseline neutrino oscillation experiments

    by Papia Panda, Dinesh Kumar Singha, Monojit Ghosh, Rukmani Mohanta

    In this work, we investigate the effect of curved spacetime on neutrino oscillation. In a curved spacetime, the effect of curvature on fermionic fields is represented by spin connection. The spin connection consists of a non-universal “contorsion” part which is expressed in terms of vector and axial current density of fermions. The contraction of contorsion part with the tetrad fields, which connects the internal flat space metric and the spacetime metric, is called torsion. In a scenario where neutrino travels through background of fermionic matter at ordinary densities in a curved spacetime, the Hamiltonian of neutrino oscillation gets modified by the torsional coupling constants $$\lambda _{21}^{\prime }$$ λ 21 ′ and $$\lambda _{31}^{\prime }$$ λ 31 ′ . The aim of this work is to study the effect of $$\lambda _{21}^{\prime }$$ λ 21 ′ and $$\lambda _{31}^{\prime }$$ λ 31 ′ in DUNE and P2SO. In our study we, (i) discuss the effect of torsional coupling constants on the neutrino oscillation probabilities, (ii) estimate the capability of P2SO and DUNE to put bounds on these parameters and (iii) show how the physics sensitivities get modified in presence of torsion.

    Cited by 7
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