Debajyoti Dutta
A5011640548- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Planetary Science and Exploration
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Black Holes and Theoretical Physics
- Quantum, superfluid, helium dynamics
- Spacecraft and Cryogenic Technologies
- Radioactive Decay and Measurement Techniques
- Cold Atom Physics and Bose-Einstein Condensates
- Molecular Spectroscopy and Structure
- Offshore Engineering and Technologies
- Superconducting Materials and Applications
- Toxic Organic Pollutants Impact
- Advanced NMR Techniques and Applications
Assam Don Bosco University
2018-2024
Krea University
2024
Tata Institute of Fundamental Research
2024
Tezpur University
2021-2023
Mississippi State University
2010-2022
Bhabha Atomic Research Centre
2011-2020
Harish-Chandra Research Institute
2016-2018
Homi Bhabha National Institute
2017
Gauhati University
2012-2015
Campbell Collaboration
2012
Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing strong interaction dynamics nucleon's quark constituents; indeed, recent proton data have attracted intense theoretical interest. In this Letter, we report new measurements factor ratio using recoil polarization method, at momentum transfers Q2=5.2, 6.7, and 8.5 GeV2. By extending range Q2 which G(E)(p) is accurately determined by more than 50%,...
We present a measurement of angular observables and test lepton flavor universality in the $B\to K^\ast \ell^+\ell^-$ decay, where $\ell$ is either $e$ or $μ$. The analysis performed on data sample corresponding to an integrated luminosity $711~\mathrm{fb}^{-1}$ containing $772\times 10^{6}$ $B\bar B$ pairs, collected at $Υ(4S)$ resonance with Belle detector asymmetric-energy $e^+e^-$ collider KEKB. result consistent Standard Model (SM) expectations, largest discrepancy from SM prediction...
We present a measurement of angular observables, $P_4'$, $P_5'$, $P_6'$, $P_8'$, in the decay $B^0 \to K^\ast(892)^0 \ell^+ \ell^-$, where $\ell^+\ell^-$ is either $e^+e^-$ or $\mu^+\mu^-$. The analysis performed on data sample corresponding to an integrated luminosity $711~\mathrm{fb}^{-1}$ containing $772\times 10^{6}$ $B\bar B$ pairs, collected at $\Upsilon(4S)$ resonance with Belle detector asymmetric-energy collider KEKB. Four $P_{4,5,6,8}'$ are extracted five bins invariant mass...
The ratio of the nucleon F_{2} structure functions, F_{2}^{n}/F_{2}^{p}, is determined by MARATHON experiment from measurements deep inelastic scattering electrons ^{3}H and ^{3}He nuclei. was performed in Hall A Facility Jefferson Lab using two high-resolution spectrometers for electron detection, a cryogenic target system which included low-activity tritium cell. data analysis used novel technique exploiting mirror symmetry nuclei, essentially eliminates many theoretical uncertainties...
We report the first precision measurement of proton electric to magnetic form factor ratio from spin-dependent elastic scattering longitudinally polarized electrons a hydrogen internal gas target. The was performed at MIT-Bates South Hall Ring over range four-momentum transfer squared Q2 0.15 0.65 (GeV/c)(2). Significantly improved results on and factors are obtained in combination with existing cross-section data electron-proton same region.
Intensive theoretical and experimental efforts over the past decade have aimed at explaining discrepancy between data for proton electric to magnetic form factor ratio, G(E)/G(M), obtained separately from cross section polarization transfer measurements. One possible explanation this difference is a two-photon-exchange contribution. In an effort search effects beyond one-photon-exchange or Born approximation, we report measurements of observables in elastic H(e[over →],e(')p[over →])...
The GEp-III and GEp-2$\gamma$ experiments were carried out in Jefferson Lab's (JLab's) Hall C from 2007-2008, to extend the knowledge of $G_E^p/G_M^p$ highest practically achievable $Q^2$ search for effects beyond Born approximation polarization transfer observables elastic $\vec{e}p$ scattering. This article reports an expanded description common experimental apparatus data analysis procedure, results a final reanalysis both experiments, including previously unpublished full-acceptance...
The Neutrino oscillations have provided an excellent opportunity to study new-physics beyond the Standard Model, popularly known as BSM. unknown couplings involving neutrinos, termed non-standard interactions (NSI), may appear `new-physics' in different neutrino experiments. NSI offers significant effects on and CP-sensitivity, which be probed various idea of neutrinos coupling with a scalar has evolved recently looks promising. perturbation mass matrix Hamiltonian. It modifies provide...
A bstract The Non-Standard Interactions (NSIs) are subdominant effects, often appearing in various extensions of SM, which may impact the neutrino oscillations through matter. It is important and interesting to explore NSIs ongoing upcoming precise experiments. In this work, we have studied imprints a scalar-mediated NSI three long-baseline (LBL) experiments (DUNE, T2HK T2HKK). effects scalar appears as medium-dependent correction mass term. Its contribution scales linearly with matter...
A bstract The study of neutrino non-standard interactions (NSI) is a well-motivated phenomenological scenario to explore new physics beyond the Standard Model. possible scalar coupling neutrinos ( ν ) with matter one such scenarios that appears as sub-dominant effect can impact -oscillations in matter. presence NSI introduces an additional contribution directly -mass matrix interaction Hamiltonian and subsequently -oscillations. This indicates may have significant on measurements related...
We evaluate the impact of sterile neutrino oscillations in so-called $3+1$ scenario on proposed long baseline experiment USA and Japan. There are two proposals for Japan which called T2HK T2HKK. show oscillation parameters expected sensitivity T2HKK to mass hierarchy, $CP$ violation octant ${\ensuremath{\theta}}_{23}$ compare it against that case standard oscillations. add ten years data from DUNE present combined $\mathrm{T}2\mathrm{HKK}+\mathrm{DUNE}$ parameters. do a full marginalization...
Assuming that there is a sterile neutrino, we ask what then the ability of long-baseline experiments to i) establish neutrino oscillation violates CP, ii) determine three-neutrino mass ordering, and iii) which CP-violating phase or phases are cause any CP violation may be observed. We find ordering could very substantial. However, effects quite large, it might prove difficult responsible for an observed violation. explain why changes sensitivities in ways does. note can probe presence...
We report the first measurement of $τ$ lepton polarization in decay ${\bar B} \rightarrow D^* τ^- {\barν_τ}$ as well a new ratio branching fractions $R(D^{*}) = \mathcal{B}({\bar {\barν_τ}) / \ell^- {\barν_{\ell}})$, where $\ell^-$ denotes an electron or muon, with decays $τ^- π^- ν_τ$ and ρ^- ν_τ$. use full data sample $772 \times 10^6$ $B{\bar B}$ pairs accumulated Belle detector at KEKB electron-positron collider. Our preliminary results, $R(D^*) 0.276 \pm 0.034{\rm (stat.)} ^{+0.029}...
A bstract We probe for evidence of invisible neutrino decay in the latest NOvA and T2K data. It is seen that both data sets are better fitted when one allows decay. consider a scenario where only third mass eigenstate ν 3 unstable decays into components. The best-fit value lifetime obtained as τ / m = 3.16 × 10 −12 s/eV from analysis 1.0×10 −11 anti-neutrino combined gives 5.01 lifetime. However, statistical significance this preference weak with no-decay hypothesis still allowed at close to...
The presence of non-unitary neutrino mixing can affect the measurement three-neutrino leptonic Dirac CP phase and hamper efforts to probe violation due degeneracies extra with standard phase. We study effect including non-unitarity on probing long-baseline experiments NO$\nu$A, T2K DUNE. analyze at level oscillation probabilities associated relevant baselines, present sensitivity for individual their combination. Our results show that there is an improvement in combination compared experiments.
We have explored the possibilities of resolving $\theta_{23}$ octant degeneracy present in newly planned Long-Baseline Neutrino Experiment (LBNE) by combining reactor data. Reactor experiments already measured third mixing angle $\theta_{13}$ very precisely and this precise measurenent turn helps measurement. examined sensitivity with without data it improves if is added. The comparative study sensitivities 10kt 35kt liquid argon Far Detectors, Near Detector, reveals that increases an...
The CP phases associated with the sterile neutrino cannot be measured in dedicated short-baseline experiments being built to test hypothesis. On other hand, these can long-baseline experiments, even though main goal of is not or measure parameters. In particular, phase $$\delta _{24}$$ affects charged-current electron appearance data experiment. this paper we show how well by next-generation DUNE, T2HK (and T2HKK). We also expected precision which combining DUNE from T2HKK. experiment seen...
We study the possibility of probing different texture zero neutrino mass matrices at long baseline experiment DUNE. Assuming a diagonal charged lepton basis and Majorana nature light neutrinos, we first classify possible with one two zeros then numerically evaluate parameter space in terms atmospheric mixing angle $\theta_{23}$ Dirac CP phase $\delta_{\text{CP}}$ which satisfies conditions. feed these values into numerical analysis order to sensitivity DUNE them. find that will be able...
We propose a new precision measurement of parity-violating electron scattering on the proton at very low Q^2 and forward angles to challenge predictions Standard Model search for physics. A unique opportunity exists carry out first proton's weak charge, $Q_W =1 - 4\sin^2θ_W$. 2200 hour parity violating asymmetry in elastic ep Q^2=0.03 (GeV/c)^2 employing 180 $μ$A 85% polarized beam 35 cm liquid Hydrogen target will determine charge with approximately 4% combined statistical systematic...
The neutrino mass ordering is one of the principal unknowns in sector. Long baseline experiments have potential resolving this issue as they are sensitive to large matter effects. superbeam experiment DUNE most promising candidates study hierarchy, along with NO$\nu$A and T2K. But presence non unitarity leptonic mixing matrix, capability such discriminate between two hierarchies gets suppressed. hierarchy sensitivity decreases new physics. In paper we analyze origin extent loss at level...