A5002005429- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Molecular Physics
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Advanced Chemical Physics Studies
- Fractal and DNA sequence analysis
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Quantum, superfluid, helium dynamics
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
Bhabha Atomic Research Centre
2013-2023
Homi Bhabha National Institute
2017-2023
A. Alikhanyan National Laboratory
2020
Indian Institute of Technology Bombay
2015-2019
Midnapore Medical College and Hospital
1983-1986
The nuclear transparency of the charged hadron produced in inclusive $(e,e^\prime)$ reaction on nucleus has been calculated using Glauber model for reaction. color (CT) and short-range correlation (SRC) nucleons have incorporated to investigate their effects hadron. transparencies proton pion are compared with data.
The ${\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ invariant mass distribution spectra in the $(\ensuremath{\gamma},{\ensuremath{\pi}}^{0}\ensuremath{\gamma})$ reaction were measured by TAPS/ELSA Collaboration to look for hadron parameters of $\ensuremath{\omega}$ meson Nb nucleus. We study mechanism this reaction, where we consider that elementary nucleus proceeds as...
For the forward going proton and $\eta$ meson, coherent meson production in $(p,p^\prime)$ reaction on spin-isospin saturated nucleus occurs only due to exchange interaction between beam nucleus. In this process, nucleon can be excited resonances $N^*$ final state arise $N^* \to N\eta$. We investigate dynamics of resonances, including Born terms, their interferences coherently added cross section reaction. discuss importance $N(1520)$ resonance show sensitivity hadron interaction.
Cross sections for the $\pi^+\pi^-$ events arising due to decay of $\rho^0$ meson have been calculated. This rho is considered produce coherently in $(p,p^\prime)$ reaction on a nucleus. The distorted wave functions continuum particles and propagator are described by eikonal form. sensitivity cross section pion emission angle as well beam energy has investigated. decaying inside outside nucleus compared. In addition, coherent incoherent contributions amplitudes presented. initial final state...
For the forward going ejectile, $\ensuremath{\Delta}$ excitation and coherent pion emission in charge exchange reaction have been described by real induced reaction. Using a pseudovector coupling to nucleon eikonally distorted waves for projectile double differential cross section ejectile energy/momentum distribution is written terms of scattering on nucleus. This has approximated corresponding measured pion. Calculated spectral shapes various reactions agree very well with distributions.
Color transparency is studied for the $K^+$ meson produced due to large four-momentum transfer in $(e,e^\prime)$ reaction on nuclei. The variation of color ($K^+$CT) with photon virtuality, and kaon momentum investigated. calculated results $K^+$CT are compared data reported from Jefferson Laboratory.
The interference of the $\rho^0$ and $\omega$ mesons has been studied in hadronic leptonic decay channels, i.e., dipion dilepton channels respectively, but this is not yet semihadronic or semileptonic channel, e.g., $V \to \pi^0\gamma$. $V$ denotes either meson. To look for quoted $\pi^0\gamma$ channel as well contribution $\rho$ meson to cross section, correlated invariant mass distribution spectra are calculated photonuclear reaction multi-GeV region. It assumed that these bosons arise...
The photonuclear reaction in the multi-GeV region occurs because of electromagnetic and hadronic interactions. latter originates due to fluctuation, i.e., vector meson, photon. total cross section is shadowed meson--nucleus (hadronic) interaction. To estimate it quantitatively, was calculated low energy ($\ensuremath{\sim}1--3$ GeV) using simple vector-meson dominance (SVMD) model, low-lying mesons (${\ensuremath{\rho}}^{0}, \ensuremath{\omega}$, $\ensuremath{\phi}$ mesons) were considered....
The coherent $\ensuremath{\eta}$-meson energy ${E}_{\ensuremath{\eta}}$ distribution spectra in proton nucleus reactions have been calculated to investigate the ${\ensuremath{\pi}}^{0}--\ensuremath{\eta}$ mesons' interference, addition study of resonance ${N}^{*}$ dynamics nucleus. elementary reaction occurring is assumed proceed as $pN\ensuremath{\rightarrow}p{N}^{*}$; ${N}^{*}\ensuremath{\rightarrow}N\ensuremath{\eta}$. Born terms intermediate state are also considered. In a...
The transparency of the hadrons produced in $\ensuremath{\gamma}(n,p){\ensuremath{\pi}}^{\ensuremath{-}}$ reaction nuclei is calculated using Glauber model modified by including Fermi motion nucleon nucleus. Because results underestimate measured for $^{4}\mathrm{He}$ nucleus, further incorporating short-range correlation and color hadron nuclear ${\ensuremath{\theta}}_{{\ensuremath{\pi}}^{\ensuremath{-}}}(\mathrm{c}.\mathrm{m}.)={50}^{\ensuremath{\circ}}, {70}^{\ensuremath{\circ}}$,...
The quasifree ${\ensuremath{\Delta}}^{++}$ production mechanism in charge exchange reactions on the $^{12}\mathrm{C}$ nucleus has been studied here framework of DWIA. In this study, is assumed to be produced a one-step process through elementary $pp\ensuremath{\rightarrow}n{\ensuremath{\Delta}}^{++}$ reaction. Since reaction localized low density region, Lagrangian for describing $\ensuremath{\Delta}$ excitation taken from study free present calculation explores mass phenomenologically, so...
The reaction mechanism for the correlated ${\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ emission in photon-induced on a proton target is studied. Since this studied GeV region, one can assume that it proceeds through formation of vector meson intermediate state. meson, being an unstable particle, decays into bosons after propagating certain distance. analysis shows event seen coincidence final state dominantly arises owing to decay \ensuremath{\omega} meson. calculated results reproduce...
Recent measurements on the energy spectra of ejectiles in (p,n) and ${(}^{3}$He,t) reactions coincidence with p${\mathrm{\ensuremath{\pi}}}^{+}$ charged particles integrated over their energies angles are analyzed theoretically DWIA framework. It is assumed that events generated by direct decay ${\mathrm{\ensuremath{\Delta}}}^{++}$. Due to peripheral nature reaction ${\mathrm{\ensuremath{\Delta}}}^{++}$ itself be produced through quasifree...
The [Formula: see text] interference has been studied in the dilepton invariant mass distribution spectra photonuclear reaction, but that is not done for gamma-nucleon reaction. In recent past, spectrum i.e., was measured at Jefferson Laboratory to look multi-GeV region. To study mechanism of this differential cross section calculated quoted energy reaction assumed proceed as text]; text], where denotes a vector meson, either or meson. photoproduction meson described by Vector Meson...
Cross sections for coherent rho production in the ${(p,p}^{\ensuremath{'}})$ reaction on ${}^{12}\mathrm{C}$ have been calculated beam energy range $1.8\ensuremath{-}2.5 \mathrm{GeV}.$ The meson produced at ${\mathrm{pp}}^{\ensuremath{'}}$ vertex is brought on-shell by effect of target nucleus through an optical potential. latter constructed using high ansatz with elementary $\ensuremath{\rho}N$ scattering amplitude coming from vector dominance model and resonance model, coupled channel...
The hadronic properties of the $\rho$ meson produced in inclusive photonuclear reaction have been investigated. elementary occurring nucleus is assumed as $\gamma N \to \rho^0 N$. meson, while propagating through nucleus, interacts with nuclear particles, and therefore, can be modified because this interaction. Being a short-lived particle, decays to various such as, $e^+e^-$, $\pi^+\pi^-$, .... etc. $e^+e^-$ invariant mass, i.e., distribution spectra calculated extract information about...
We report results from a study of hadronic transitions the $χ_{bJ}(nP)$ states bottomonium at Belle. The $P$-wave are reconstructed in to $Υ(1S)$ with emission an $ω$ meson. $n=2$ triplet provide unique laboratory which nonrelativistic quantum chromodynamics, as kinematic threshold for production and lies between $J=0$ $J=1$ states. A search $χ_{bJ}(3P)$ is also reported.