Publications (111)
Characteristics of polar coronal hole jets
K. Chandrashekhar, A. Bemporad, D. Banerjee +2
High spatial- and temporal-resolution images of coronal hole regions show a dynamical environment where mass flows and jets are frequently observed. These jets are believed to be i…
Lattice study of a magnetic contribution to heavy quark momentum diffusion
D. Banerjee, S. Datta, M. Laine
Heavy quarks placed within a hot QCD medium undergo Brownian motion, characterized by specific transport coefficients. Their determination can be simplified by expanding them in $T…
Phase components in Zr7Ni10 and Hf7Ni10 binary alloys; investigations by perturbed angular correlation spectroscopy and first principles calculations
S. K. Dey, C. C. Dey, S. Saha +3
Intermetallic compounds Zr7Ni10 and Hf7Ni10 have been studied by perturbed angular correlation (PAC) spectroscopy considering the fact that Zr7Ni10 has application as hydrogen stor…
Unravelling the components of a multi-thermal coronal loop using magnetohydrodynamic seismology
S. Krishna Prasad, D. B. Jess, J. A. Klimchuk +1
Coronal loops, constituting the basic building blocks of the active Sun, serve as primary targets to help understand the mechanisms responsible for maintaining multi-million Kelvin…
Search for a light muon-philic with the NA64- experiment at CERN
Yu. M. Andreev, D. Banerjee, B. Banto Oberhauser +58
The extension of Standard Model made by inclusion of additional gauge symmetry can explain the difference between the measured and the predicted value of the muo…
The Extended Solar Cycle: Muddying the Waters of Solar/Stellar Dynamo Modeling Or Providing Crucial Observational Constraints?
A. K. Srivastava, S. W. McIntosh, N. Arge +17
In 1844 Schwabe discovered that the number of sunspots increased and decreased over a period of about 11 years, that variation became known as the sunspot cycle. Almost eighty year…
Atomic Quantum Simulation of Dynamical Gauge Fields coupled to Fermionic Matter: From String Breaking to Evolution after a Quench
D. Banerjee, M. Dalmonte, M. Müller +4
Using a Fermi-Bose mixture of ultra-cold atoms in an optical lattice, we construct a quantum simulator for a U(1) gauge theory coupled to fermionic matter. The construction is base…
Accelerating waves in polar coronal holes as seen by EIS and SUMER
G. R. Gupta, D. Banerjee, L. Teriaca +2
We present EIS/Hinode & SUMER/SoHO joint observations allowing the first spectroscopic detection of accelerating disturbances as recorded with coronal lines in inter-plume and plum…
Hindered Dipole Strength in octupole bands in Gd from Lifetime Measurements with fast timing technique
A. Pal, S. Basak, D. Kumar +7
The lifetimes of the low-lying negative-parity state at 1414~keV and state at 1398~keV in Gd have been measured using the -- fast-timing technique with…
Improved limits on a new in scenarios with the NA64 experiment at CERN
The NA64 Collaboration, Yu. M. Andreev, A. Antonov +53
Extensions of the Standard Model featuring an additional gauge symmetry provide a compelling framework linking the origin of neutrino masses to possible dark matter ca…
Twisting/Swirling Motions During a Prominence Eruption as seen from SDO/AIA
V. Pant, A. Datta, D. Banerjee +2
A quiescent prominence was observed at north-west limb of the Sun using different channels of Atmospheric Imaging Assembly (AIA) onboard Solar Dynamics Observatory (SDO). We report…
The Fibre Resolved opticAl and Near-ultraviolet Czerny-Turner Imaging Spectropolarimeter (FRANCIS)
D. B. Jess, S. D. T. Grant, W. Bate +9
The solar physics community is entering a golden era that is ripe with next-generation ground- and space-based facilities. With ever-increasing resolving power stemming from the ne…
Mass distribution in 36.2 MeV alpha induced fission of 232Th
D. Banerjee, T. N. Nag, R. Tripathi +7
Mass distribution of fission products has been determined in (alpha+232Th) reaction at Elab=36.2 MeV using alpha particles from the cyclotron at the Variable Energy Cyclotron Centr…
Propagating MHD waves in coronal holes
D. Banerjee, G. R. Gupta, L. Teriaca
Coronal holes are the coolest and darkest regions of the solar atmosphere, as observed both on the solar disk and above the solar limb. Coronal holes are associated with rapidly ex…
Kelvin-Helmholtz Instability in non-Newtonian Complex Plasma
D. Banerjee, S. Garai, M. S. Janaki +1
The Kelvin-Helmholtz (KH) instability is studied in a non-Newtonian dusty plasma with an experimentally verified model [Phys. Rev. Lett. {\bf 98}, 145003 (2007)] of shear flow rate…
Non-reciprocal circular dichroism of ferro-rotational phonons in MnTiO
H. Y. Huang, G. Channagowdra, D. Banerjee +10
X-ray circular dichroism (XCD), defined as the difference in absorption or scattering intensity between X-rays of opposite polarizations, arises from the breaking of spatial invers…
Search for Light Dark Matter with NA64 at CERN
Yu. M. Andreev, D. Banerjee, B. Banto Oberhauser +60
Thermal dark matter models with particle masses below the electroweak scale can provide an explanation for the observed relic dark matter density. This would imply the existen…
Measurement of -decay end point energy with Planar HPGe detector
T. Bhattacharjee, Deepak Pandit, S. K. Das +7
The end point energies of nuclear decays have been measured with a segmented planar Ge LEPS detector using both singles and coincidence techniques. The coincidence ha…
Broken Symmetry and Fractionalized Flux Strings in a Staggered U(1) Pure Gauge Theory
A. Banerjee, D. Banerjee, G. Kanwar +3
Inspired by self-adjoint extensions of the electric field operator in the Hamiltonian formalism, we extend the Wilsonian framework of Abelian lattice gauge theory by introducing a…
Forward Modelling of Standing Slow Modes in Flaring Coronal Loops
D. Yuan, T. Van Doorsselaere, D. Banerjee +1
Standing slow mode waves in hot flaring loops are exclusively observed in spectrometers and are used to diagnose the magnetic field strength and temperature of the loop structure.…
Automated Detection of Coronal Mass Ejections in STEREO Heliospheric Imager data
V. Pant, S. Willems, L. Rodriguez +3
We have performed, for the first time, the successful automated detection of Coronal Mass Ejections (CMEs) in data from the inner heliospheric imager (HI-1) cameras on the STEREO A…
Transverse oscillations in a coronal loop triggered by a jet
S. Sarkar, V. Pant, A. K. Srivastava +1
We detect and analyse transverse oscillations in a coronal loop, lying at the south east limb of the Sun as seen from the \textit{Atmospheric Imaging Assembly} (AIA) onboard \texti…
Detection of high frequency oscillations and damping from multi-slit spectroscopic observations of the corona
T. Samanta, J. Singh, G. Sindhuja +1
During the total solar eclipse of 11 July 2010, multi-slit spectroscopic observations of the solar corona were performed from Easter Island, Chile. To search for high-frequency wav…
Unsupervised machine learning for detection of phase transitions in off-lattice systems II. Applications
R. B. Jadrich, B. A. Lindquist, W. D. Pineros +2
We outline how principal component analysis (PCA) can be applied to particle configuration data to detect a variety of phase transitions in off-lattice systems, both in and out of…
Digitized archive of the Kodaikanal images: Representative results of solar cycle variation from sunspot area determination
B. Ravindra, T. G. Priya, K. Amareswari +3
Photographic images are valuable data resources for studying long term changes in the solar magnetic field and its influence on the Earth's climate and weather. We digitized more t…
Study of surface-bulk mass transport and phase transformation in nano TiO2 using hyperfine interaction technique
S. K. Das, D. Banerjee, S. V. Thakare +4
Phase transition from anatase to rutile for the 70nm TiO2 crystallite has been investigated by annealing at different temperatures followed by TDPAC measurement of these TiO2 cryst…
Jeans Instability in a viscoelastic fluid
M. S. Janaki, N. Chakrabarti, D. Banerjee
The well known Jeans instability is studied for a viscoelastic, gravitational fluid using generalized hydrodynamic equations of motions. It is found that the threshold for the onse…
Shear Flow instability in a strongly coupled dusty plasma
D. Banerjee, M. S. Janaki, N. Chakrabarti
Linear stability analysis of strongly coupled incompressible dusty plasma in presence of shear flow has been carried out using Generalized Hydrodynamical(GH) model. With the proper…
Extraction of the bare form factors for the semi-leptonic decays
F. Bahr, D. Banerjee, M. Koren +2
The computation of the form factors for the decay is presented. The b quark is treated by means of Heavy Quark Effective Theory, currently in the static approxi…
Shear Waves in an inhomogeneous strongly coupled dusty plasma
M. S Janaki, D. Banerjee, N. Chakrabarti
The properties of electrostatic transverse shear waves propagating in a strongly coupled dusty plasma with an equilibrium density gradient are examined using the generalized hydrod…
50 GeV in, nothing out: a sensitive probe of invisible and decays with NA64h
Yu. M. Andreev, A. Antonov, M. A. Ayala Torres +54
We present the first results from a proof-of-concept search for dark sectors via invisible decays of pseudoscalar and mesons in the NA64h experiment at the CERN SPS. Our…
Real-Time Simulation of Large Open Quantum Spin Systems driven by Measurements
D. Banerjee, F. -J. Jiang, M. Kon +1
We consider a large quantum system with spins whose dynamics is driven entirely by measurements of the total spin of spin pairs. This gives rise to a dissipative coup…
Reflectivity Studies and Production of New Flat Mirrors for the Cherenkov Threshold Detectors at CERN
J. Buesa Orgaz, M. van Dijk, D. Banerjee +13
Cherenkov threshold detectors (XCET) are used for identifying particles in the experimental areas at CERN. These detectors observe Cherenkov light emitted by charged particles trav…
From the Quantum Link Model on the Honeycomb Lattice to the Quantum Dimer Model on the Kagomé Lattice: Phase Transition and Fractionalized Flux Strings
D. Banerjee, F. -J. Jiang, T. Z. Olesen +2
We consider the -d quantum link model on the honeycomb lattice and show that it is equivalent to a quantum dimer model on the Kagomé lattice. The model has crystall…
High efficiency veto hadron calorimeter in the NA64 experiment at CERN
Yu. M. Andreev, A. Antonov, M. A. Ayala Torres +53
NA64 is a fixed-target experiment at the CERN SPS designed to search for Light particle Dark Matter (LDM) candidates with masses in the sub-GeV range. During the 2016-2022 runs, th…
Variation of Emission Line Width in Mid- and High-Latitude Corona
S. Krishna Prasad, Jagdev Singh, D. Banerjee
Spectroscopic studies of the solar corona, using the high spatial and spectral resolution 25-cm coronagraph at the Norikura observatory for equatorial off-limb observations, indica…
Atomic Quantum Simulation of U(N) and SU(N) Non-Abelian Lattice Gauge Theories
D. Banerjee, M. Bögli, M. Dalmonte +4
Using ultracold alkaline-earth atoms in optical lattices, we construct a quantum simulator for U(N) and SU(N) lattice gauge theories with fermionic matter based on quantum link mod…
Summary Report of the Physics Beyond Colliders Study at CERN
R. Alemany Fernández, M. Au, G. Arduini +80
The Physics Beyond Collider (PBC) Study Group was initially mandated by the CERN Management to prepare the previous European Particle Physics Strategy Update for CERN projects othe…
The effect of z^prime boson on same-sign dimuon charge asymmetry in system
S. Sahoo, M. Kumar, D. Banerjee
The recent observation of the same-sign dimuon charge asymmetry in the B system by the D0 collaboration has 3.9 sigma deviation from the standard model prediction. However, the rec…
Nature of Quiet Sun Oscillations Using Data from the Hinode, TRACE, and SOHO Spacecraft
G. R. Gupta, S. Subramanian, D. Banerjee +2
We study the nature of quiet-Sun oscillations using multi-wavelength observations from TRACE, Hinode, and SOHO. The aim is to investigate the existence of propagating waves in the…
Search for pseudoscalar bosons decaying into pairs in the NA64 experiment at the CERN SPS
Yu. M. Andreev, D. Banerjee, J. Bernhard +52
We report the results of a search for a light pseudoscalar particle that couples to electrons and decays to performed using the high-energy CERN SPS H4 electron beam.…
Dynamics of Coronal Bright Points as seen by Sun Watcher using Active Pixel System detector and Image Processing (SWAP), Atmospheric Imaging Assembly AIA), and Helioseismic and Magnetic Imager (HMI)
K. Chandrashekhar, S. Krishna Prasad, D. Banerjee +2
The \textit{Sun Watcher using Active Pixel system detector and Image Processing}(SWAP) on board the \textit{PRoject for OnBoard Autonomy\todash 2} (PROBA\todash 2) spacecraft provi…
Role of p-induced population of medium mass(A 150) neutron rich nuclei
D. Banerjee, A. Saha, T. Bhattacharjee +11
Excitation functions were measured by stacked-foil activation technique for the Nd(p, xpyn) reaction using 97.65 enriched Nd target. Measurement up to 50$%…
Hunting down the X17 boson at the CERN SPS
E. Depero, Yu. M. Andreev, D. Banerjee +53
Recently, the ATOMKI experiment has reported new evidence for the excess of events with a mass 17 MeV in the nuclear transitions of He, that they previously obs…
Frequency-dependent damping in propagating slow magneto-acoustic waves
S. Krishna Prasad, D. Banerjee, T. Van Doorsselaere
Propagating slow magneto-acoustic waves are often observed in polar plumes and active region fan loops. The observed periodicities of these waves range from a few minutes to few te…
Oscillations in active region fan loops: Observations from EIS/{\it Hinode} and AIA/SDO
S. Krishna Prasad, D. Banerjee, Jagdev Singh
Active region fan loops in AR 11076 were studied, in search of oscillations, using high cadence spectroscopic observations from EIS on board Hinode combined with imaging sequences…
MHD Seismology of a loop-like filament tube by observed kink waves
V. Pant, A. K. Srivastava, D. Banerjee +4
We report and analyze the observational evidence of global kink oscillations in a solar filament as observed in H alpha by National Solar Observatory (NSO)/Global Oscillation Netwo…
Optimised sensitivity to leptonic CP violation from spectral information: the LBNO case at 2300 km baseline
LBNO Collaboration, S. K. Agarwalla, L. Agostino +157
One of the main goals of the Long Baseline Neutrino Observatory (LBNO) is to study the behaviour (spectral information) of the electron neutrino and antineutrino appearance p…
PAC study of the static and dynamic aspects of metal atom inside C60 cage
S. K. Das, R. Guin, D. Banerjee +5
30 keV 111mCd and 50 keV 199mHg beams from ISOLDE were used to implant on preformed target of C60 with the thickness of 1 mg/cm2. Endofullerene compounds, viz.,111mCd@C60 and 199mH…
Searching for Light Dark Matter and Dark Sectors with the NA64 experiment at the CERN SPS
Yu. M. Andreev, A. Antonov, M. A. Ayala Torres +49
Since its approval in 2016, NA64 has pioneered light dark matter (LDM) searches with electron, positron, muon, and hadron beams. The experiment has successfully met its primary obj…
Crystalline Confinement
D. Banerjee, P. Widmer, F. -J. Jiang +1
We show that exotic phases arise in generalized lattice gauge theories known as quantum link models in which classical gauge fields are replaced by quantum operators. While these q…
Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN
D. Banerjee, V. E. Burtsev, A. G. Chumakov +45
We report the first results on a direct search for a new 16.7 MeV boson (X) which could explain the anomalous excess of e+e- pairs observed in the excited Be-8 nucleus decays. Due…
Investigating width distribution of slow and fast CMEs in solar cycles 23 and 24
V. Pant, R. Majumdar, R. Patel +3
Coronal Mass Ejections (CMEs) are highly dynamic events originating in the solar atmosphere, that show a wide range of kinematic properties and are the major drivers of the space w…
Dark matter search in missing energy events with NA64
D. Banerjee, V. E. Burtsev, A. G. Chumakov +48
A search for sub-GeV dark matter production mediated by a new vector boson , called dark photon, is performed by the NA64 experiment in missing energy events from 100 GeV elect…
Propagating waves in polar coronal holes as seen by SUMER and EIS
D. Banerjee, L. Teriaca, G. R. Gupta +3
To study the dynamics of coronal holes and the role of waves in the acceleration of the solar wind, spectral observations were performed over polar coronal hole regions with the SU…
Probing Light Dark Matter with positron beams at NA64
Yu. M. Andreev, A. Antonov, D. Banerjee +63
We present the results of a missing-energy search for Light Dark Matter which has a new interaction with ordinary matter transmitted by a vector boson, called dark photon $A^\prime…
Search for vector mediator of Dark Matter production in invisible decay mode
NA64 Collaboration, D. Banerjee, V. E. Burtsev +41
A search is performed for a new sub-GeV vector boson () mediated production of Dark Matter () in the fixed-target experiment, NA64, at the CERN SPS. The , called dark p…
Propagating intensity disturbances in polar corona as seen from AIA/SDO
S. Krishna Prasad, D. Banerjee, G. R. Gupta
Polar corona is often explored to find the energy source for the acceleration of the fast solar wind. Earlier observations show omni-presence of quasi-periodic disturbances, travel…
Anisotropy of electron momentum distribution in BiSrCaCuO superconductor studied by positron annihilation technique
Mahuya Chakrabarti, A. Sarkar, S. Chattapadhayay +4
The temperature dependent (30 K to 300 K) Doppler broadening of the positron annihilated g-radiation (DBPAR) measurement has been carried out on single crystalline Bi-2212 high Tc…
Identification of a long lived decaying isomer in Pm
A. Saha, T. Bhattacharjee, D. Banerjee +9
The decay of odd-odd Pm has been studied by populating the nucleus with the Nd(p,n)Pm reaction at E = 8.0 MeV using 97 enriched Nd targ…
Proof of principle for a light dark matter search with low-energy positron beams at NA64
Yu. M. Andreev, A. Antonov, M. A. Ayala Torres +54
Thermal light dark matter (LDM) with particle masses in the 1 MeV - 1 GeV range could successfully explain the observed dark matter abundance as a relic from the primordial Univers…
Properties of slow magneto-acoustic waves observed simultaneously using Hi-C 2.1 and AIA
Suraj K. Tripathy, S. Krishna Prasad, D. Banerjee
Propagating slow magneto-acoustic waves are commonly observed in different coronal structures but are most prominent in active region fan loops. Their rapid damping with damping le…
Lifetimes and Transition Probabilities in
D. Kumar, S. Basak, A. Pal +4
Lifetimes for the and states have been directly measured using fast timing technique for low lying states of , populated from $β^-$ decay of…
Investigation of the effectiveness of non-inductive `multi-harmonic' electron cyclotron current drive through modeling multi-pass absorptions in the EXL-50 spherical tokamak
D. Banerjee, S. D. Song, H. S. Xie +14
The effectiveness of multiple electron cyclotron resonance (ECR) harmonics has been thoroughly investigated in context of high current drive efficiency, generally observed in fully…
Constraints on New Physics in the Electron g-2 from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector
Yu. M. Andreev, D. Banerjee, J. Bernhard +49
We performed a search for a new generic boson, which could be a scalar (), pseudoscalar (), vector () or an axial vector () particle produced in the 100 GeV electro…
Study of Electric Quadrupole Perturbation at Multiple Probe Sites in Hf-doped Rutile in a Single Perturbed γ-γ Angular Correlation Measurement
D. Banerjee, S. K. Das, S. V. Thakare
Two different probes, viz., 111In/111Cd and 181Hf/181Ta, simultaneously have been incorporated in both pure rutile and Hafnium (Hf) -doped rutile Titanium Dioxide (TiO2) systems fo…
Nematic Confined Phases in the Quantum Link Model on a Triangular Lattice: An Opportunity for Near-Term Quantum Computations of String Dynamics on a Chip
D. Banerjee, S. Caspar, F. -J. Jiang +2
The quantum link model on the triangular lattice has two rotation-symmetry-breaking nematic confined phases. Static external charges are connected by confining strings consi…
The LBNO long-baseline oscillation sensitivities with two conventional neutrino beams at different baselines
LBNO Collaboration, S. K. Agarwalla, L. Agostino +157
The proposed Long Baseline Neutrino Observatory (LBNO) initially consists of kton liquid double phase TPC complemented by a magnetised iron calorimeter, to be installed a…
Search for a New B-L Z' Gauge Boson with the NA64 Experiment at CERN
Yu. M. Andreev, D. Banerjee, B. Banto-Oberhauser +55
A search for a new gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out for the first time using the missing-energy technique in the NA…
Interfaces, Strings, and a Soft Mode in the Square Lattice Quantum Dimer Model
D. Banerjee, M. Bögli, C. P. Hofmann +3
The quantum dimer model on the square lattice is equivalent to a gauge theory. Quantum Monte Carlo calculations reveal that, for values of the Rokhsar-Kivelson (RK) coupling…
Study of decays in the nonuniversal Z' model
D. Banerjee, M. Kumar, P. Nayek +1
We investigate decays in a nonuniversal Z' model derived from extension of the standard model (SM). Considering the Z'-mediated flavor changing neutra…
Qubit rotation and Berry Phase
D. Banerjee, P. Bandyopadhyay
A quantized fermion can be represented by a scalar particle encircling a magnetic flux line. It has the spinor structure which can be constructed from quantum gates and qubits. We…
Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel
C. Cazzaniga, P. Odagiu, E. Depero +55
We report the results of a search for a new vector boson () decaying into two dark matter particles of different mass. The heavier particle subsequently deca…
First Imaging Observation of Standing Slow Wave in Coronal Fan loops
V. Pant, A. Tiwari, D. Yuan +1
We observe intensity oscillations along coronal fan loops associated with the active region AR 11428. The intensity oscillations were triggered by blast waves which were generated…
Simultaneous longitudinal and transverse oscillation in an active filament
V. Pant, R. Mazumder, D. Yuan +3
We report on the co-existence of longitudinal and transverse oscillations in an active filament. On March 15 2013, a M1.1 class flare was observed in the active region AR 11…
MHD Waves in open coronal structures
D. Banerjee, S. Krishna Prasad, V. Pant +8
Modern observatories have revealed the ubiquitous presence of magnetohydrodynamic waves in the solar corona. The propagating waves (in contrast to the standing waves) are usually o…
On the statistical detection of propagating waves in polar coronal holes
G. R. Gupta, E. O'Shea, D. Banerjee +2
Waves are important for the heating of the solar corona and the acceleration of the solar wind. We have examined a long spectral time series of a northern coronal hole observed on…
Viscosity gradient driven instability of `shear mode' in a strongly coupled plasma
D. Banerjee, M. S. Janaki, N. Chakrabarti +1
The influence of viscosity gradient (due to shear flow) on low frequency collective modes in strongly coupled dusty plasma is analyzed. It is shown that for a well known viscoelast…
MHD Waves in the coronal holes
D. Banerjee, S. Krishna Prasad
Coronal holes are the dark patches in the solar corona associated with relatively cool, less dense plasma and unipolar fields. The fast component of the solar wind emanates from th…
Signatures of Alfven waves in the polar coronal holes as seen by EIS/Hinode
D. Banerjee, D. Perez-Suarez, J. G. Doyle
Context. We diagnose the properties of the plume and interplume regions in a polar coronal hole and the role of waves in the acceleration of the solar wind. Aims. We attempt to det…
Effect of both Z and Z^prime - mediated flavor-changing neutral currents on decays into
S. Sahoo, D. Banerjee, M. Kumar +1
In recent years, decays into has attracted a lot of attention since it is very sensitive to the structure of standard model (SM) and potential source of new phys…
A New Type of Lattice Gauge Theory through Self-adjoint Extensions
A. Banerjee, D. Banerjee, G. Kanwar +3
A generalization of Wilsonian lattice gauge theory may be obtained by considering the possible self-adjoint extensions of the electric field operator in the Hamiltonian formalism.…
Search for invisible decays of sub-GeV dark photons in missing-energy events at the CERN SPS
NA64 Collaboration, D. Banerjee, V. Burtsev +44
We report on a direct search for sub-GeV dark photons (A') which might be produced in the reaction e^- Z \to e^- Z A' via kinetic mixing with photons by 100 GeV electrons incident…
High purity 100 GeV electron identification with synchrotron radiation
E. Depero, D. Banerjee, V. Burtsev +36
In high energy experiments such as active beam dump searches for rare decays and missing energy events, the beam purity is a crucial parameter. In this paper we present a technique…
Prospects in the search for a new light boson with the NA64 experiment at the CERN SPS
H. Sieber, D. Banerjee, P. Crivelli +6
A light vector boson coupled to the second and third lepton generations through current with mass below 200 MeV provides a very viable explanation in terms of new…
Performance of Multiplexed XY Resistive Micromegas detectors in a high intensity beam
D. Banerjee, V. Burtsev, A. Chumakov +38
We present the performance of multiplexed XY resistive Micromegas detectors tested in the CERN SPS 100 GeV/c electron beam at intensities up to 3.3 10 e/(s…
Analysis of rare decays in a non-universal model
D. Banerjee, S. Sahoo
We investigate the rare baryonic decays in a non-universal model, which is one of the well-motivated extensions of the standard model (SM). Consider…
On the observations of rapid forced reconnection in the solar corona
A. K. Srivastava, Sudheer K. Mishra, P. JelÃnek +7
Using multiwavelength imaging observations from the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) on 03 May 2012, we present a novel physical scen…
Low lying excitations in Pm
A. Pal, S. Basak, T. Bhattacharjee +19
The low lying excitations in odd-odd Pm have been studied through proton induced reaction with an array of five Compton suppressed Clover HPGe and one segmented planar Ge d…
Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS
Yu. M. Andreev, D. Banerjee, B. Banto Oberhauser +54
A search for Dark Sectors is performed using the unique M2 beam line at the CERN Super Proton Synchrotron. New particles () could be produced in the bremsstrahlung-like reaction…
The (2+1)-d U(1) Quantum Link Model Masquerading as Deconfined Criticality
D. Banerjee, F. -J. Jiang, P. Widmer +1
The -d U(1) quantum link model is a gauge theory, amenable to quantum simulation, with a spontaneously broken SO(2) symmetry emerging at a quantum phase transition. Its low-…
Propagating Disturbances along fan-like coronal loops in an active region
S. Mandal, T. Samanta, D. Banerjee +2
Propagating disturbances are often observed in active region fan-like coronal loops. They were thought to be due to slow mode MHD waves based on some of the observed properties. Bu…
On the formation height of low-corona and chromospheric channels of the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO)
Y. Sanjay, S. Krishna Prasad, R. Erdelyi +3
The multi-wavelength data from the Solar Dynamics Observatory (SDO) is extensively used in studying the physics of the Sun and its atmosphere. In this study, we estimate the format…
Diagnostics of the Coronal Hole and the adjacent Quiet Sun by The Hinode/EUV Imaging Spectrometer (EIS)
P. Kayshap, D. Banerjee, A. K. Srivastava
A comparison between a Coronal Hole (CH) and the adjacent Quiet-Sun (QS) has been performed using spectroscopic diagnostics of Hinode/ the EUV Imaging Spectrometer (EIS). Coronal f…
Improved limits on a hypothetical X(16.7) boson and a dark photon decaying into pairs
D. Banerjee, J. Bernhard, V. E. Burtsev +51
The improved results on a direct search for a new X(16.7 MeV) boson which could explain the anomalous excess of pairs observed in the excited 8Be nucleus decays ("Berilliu…
Spectroscopic Observations of Propagating Disturbances in a Polar Coronal Hole: Evidence of Slow Magneto-acoustic Waves
G. R. Gupta, L. Teriaca, E. Marsch +2
We focus on detecting and studying quasi-periodic propagating features that have been interpreted both in terms of slow magneto-acoustic waves and of high speed upflows. We analyze…
First constraints on the explanation of the muon anomaly from NA64- at CERN
Yu. M. Andreev, A. Antonov, D. Banerjee +58
The inclusion of an additional gauge symmetry would release the tension between the measured and the predicted value of the anomalous muon magnetic moment: this…
Solar coronal magnetic fields derived using seismology techniques applied to omnipresent sunspot waves
D. B. Jess, V. E. Reznikova, R. S. I. Ryans +9
Sunspots on the surface of the Sun are the observational signatures of intense manifestations of tightly packed magnetic field lines, with near-vertical field strengths exceeding 6…
The effects of transients on photospheric and chromospheric power distributions
T. Samanta, V. M. J. Henriques, D. Banerjee +4
We have observed a quiet Sun region with the Swedish 1-meter Solar Telescope (SST) equipped with CRISP Imaging SpectroPolarimeter. High-resolution, high-cadence, H line scannin…
Low lying spectroscopy of odd-odd Eu
T. Bhattacharjee, D. Banerjee, S. K. Das +6
Electron Capture (EC) decay of Gd( = 48d) to the low lying states of Eu has been studied using high-resolution ray spectroscopy. The Gd a…