S. Hassani
A5114374568- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Algebraic structures and combinatorial models
- Muon and positron interactions and applications
- Advanced Combinatorial Mathematics
- Theoretical and Computational Physics
- Nonlinear Waves and Solitons
- Quantum chaos and dynamical systems
- Molecular spectroscopy and chirality
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Medical Imaging Techniques and Applications
- Nuclear reactor physics and engineering
- advanced mathematical theories
- Nuclear physics research studies
Université Paris-Saclay
2012-2025
Institut de Recherche sur les Lois Fondamentales de l'Univers
2015-2024
CEA Paris-Saclay
2015-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
John F. Kennedy Medical Center
2024
University of Bern
2023
Albert Einstein College of Medicine
2023
Eötvös Loránd University
2023
Boston University
2023
Duke University
2023
The T2K experiment reports updated measurements of neutrino and antineutrino oscillations using both appearance disappearance channels. This result comes from an exposure $14.9(16.4)\ifmmode\times\else\texttimes\fi{}1{0}^{20}$ protons on target in (antineutrino) mode. Significant improvements have been made to the interaction model far detector reconstruction. An extensive set simulated data studies also performed quantify effect uncertainties oscillation parameter sensitivity. performs...
The future opportunities for high-density QCD studies with ion and proton beams at the LHC are presented. Four major scientific goals identified: characterisation of macroscopic long wavelength Quark-Gluon Plasma (QGP) properties unprecedented precision, investigation microscopic parton dynamics underlying QGP properties, development a unified picture particle production from small (pp) to large (nucleus--nucleus) systems, exploration densities in nuclei broad ($x$, $Q^2$) kinematic range...
We present a formalism for calculating three effects of nuclear dissipation on neutron emission prior to fission: (1) Kramers's modification the Bohr-Wheeler statistical-model result fission width; (2) transient time required build up quasistationary probability flow over barrier; and (3) mean system descend from saddle point scission. Each these increases average multiplicity neutrons emitted relative that calculated with standard statistical model. The calculation includes dependence ratio...
This paper reports the first simultaneous measurement of double differential muon neutrino charged-current cross section on oxygen and carbon without pions in final state as a function outgoing kinematics, made at ND280 off-axis near detector T2K experiment. The ratio sections is also provided to help validate various models' ability extrapolate between nuclear targets, required oscillation analyses. data are taken using beam with an energy spectrum peaked 0.6 GeV. extracted compared...
From some observations on the linear differential operators occurring in Lattice Green function of d-dimensional face centred and simple cubic lattices, n-particle contributions to magnetic susceptibility square Ising model, we forward conjectures diagonals rational functions. These are also agreement with exact results obtain for many Calabi-Yau operators, other examples related, or not related physics. Consider a globally bounded power series which is diagonal functions certain number...
We study the discovery potential of axion-like particles (ALP), pseudo-scalars weakly coupled to Standard Model fields, at Large Hadron Collider (LHC). Our focus is on ALPs electromagnetic field, which would induce anomalous scattering light-by-light. This can be directly probed in central exclusive production photon pairs ultra-peripheral collisions LHC proton and heavy ion collisions. consider non-standard collision modes LHC, such as argon-argon $\sqrt{s_{NN}} = 7$ TeV proton-lead 8.16$...
We consider the Fuchsian linear differential equation obtained (modulo a prime) for , five-particle contribution to susceptibility of square lattice Ising model. show that one can understand factorization corresponding operator from calculations using just single prime. A particular combination and be removed resulting series is annihilated by high order globally nilpotent ODE. The (minimal order) operator, 29, splits into factors small orders. fifth-order occurs as left-most factor...
We show that the n-fold integrals χ(n) of magnetic susceptibility Ising model, as well various other 'Ising class', or from enumerative combinatorics, like lattice Green functions, correspond to a distinguished class functions generalizing algebraic functions: they are actually diagonals rational functions. As consequence, power series expansions the, analytic at x = 0, solutions these linear differential equations 'derived geometry' globally bounded, which means after just one rescaling...
This paper presents the first combined measurement of double-differential muon neutrino and antineutrino charged-current cross sections with no pions in final state on hydrocarbon at off-axis near detector T2K experiment. The data analyzed this work comprise $5.8\ifmmode\times\else\texttimes\fi{}{10}^{20}$ $6.3\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons target mode respectively, a beam energy peak 0.6 GeV. Using two measured sections, sum, difference, asymmetry were calculated aim...
The modeling of neutrino-nucleus interactions constitutes a challenging source systematic uncertainty for the extraction precise values neutrino oscillation parameters in long-baseline accelerator experiments. To improve such and minimize corresponding uncertainties, new generation detectors is being developed, which aim to measure complete final state particles resulting from interactions. In order fully benefit improved detector capabilities, simulations nuclear effects on final-state...
We calculate very long low- and high-temperature series for the susceptibility χ of square lattice Ising model as well five-particle contribution χ(5) six-particle χ(6). These calculations have been made possible by use highly optimized polynomial time modular algorithms a total more than 150 000 CPU hours on computer clusters. The (low- regimes), χ(6) are now extended to 2000 terms. In addition, χ(5), 10 terms calculated modulo single prime, used find linear ODE satisfied prime. A diff-Padé...
Present and next generation of long-baseline accelerator experiments are bringing the measurement neutrino oscillations into precision era with ever-increasing statistics.One most challenging aspects achieving such measurements is developing relevant systematic uncertainties in modeling nuclear effects neutrino-nucleus interactions.To address this problem, state-of-the-art detectors being developed to extract detailed information about all particles produced fully profit from these...
We use the recently derived form factor expansions of diagonal two-point correlation function square Ising model to study susceptibility for a magnetic field applied only one lattice, isotropic model. exactly evaluate and two particle contributions χ(1)d χ(2)d corresponding susceptibility, obtain linear differential equations three four contributions, as well five contribution χ(5)d, but modulo given prime. these exact show that not Russian-doll structure also direct sum on operators...
A bstract The electron (anti-)neutrino component of the T2K neutrino beam constitutes largest background in measurement appearance at far detector. scattering is measured directly with off-axis near detector, ND280. selection events plastic scintillator target from both and anti-neutrino mode beams discussed this paper. flux integrated single differential charged-current inclusive cross-sections, dσ/dp dσ/d cos( θ ), total cross-sections a limited phase-space momentum angle ( p > 300...
In a previous paper (2004 J. Phys. A: Math. Gen. 37 9651–68) we have given the Fuchsian linear differential equation satisfied by χ(3), 'three-particle' contribution to susceptibility of isotropic square lattice Ising model. This gives details calculations (with some useful tricks and tools) allowing one obtain long series in polynomial time. The method is based on expansion variables that appear (n − 1)-dimensional integrals representing n-particle model χ. integration rules are...
We present a simple, but efficient, way to calculate connection matrices between sets of independent local solutions, defined at two neighboring singular points, Fuchsian differential equations quite large orders, such as those found for the third and fourth contribution ($\chi^{(3)}$ $\chi^{(4)}$) magnetic susceptibility square lattice Ising model. deduce all critical behaviors solutions $\chi^{(3)}$ $\chi^{(4)}$, well asymptotic behavior coefficients in corresponding series expansions....
We study the Ising model two-point diagonal correlation function $ C(N,N)$ by presenting an exponential and form factor expansion in integral representation which differs from known of Wu, McCoy, Tracy Barouch. extend this expansion, weighting, powers a variable $\lambda$, $j$-particle contributions, f^{(j)}_{N,N}$. The corresponding \lambda$ extension function, C(N,N; \lambda)$, is shown, for arbitrary to be solution sigma Painlev{\'e} VI equation introduced Jimbo Miwa. Linear differential...
We give the Fuchsian linear differential equation satisfied by $\chi^{(4)}$, ``four-particle'' contribution to susceptibility of isotropic square lattice Ising model. This is deduced from a series expansion method introduced in two previous papers and applied with some symmetries tricks specific $\chi^{(4)}$. The corresponding order ten operator exhibits large set factorization properties. Among these factorizations one highly remarkable: it corresponds fact that two-particle $\chi^{(2)}$...