A5033190076- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Nuclear Physics and Applications
- Black Holes and Theoretical Physics
- Muon and positron interactions and applications
- Planetary Science and Exploration
- International Science and Diplomacy
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Gamma-ray bursts and supernovae
- Superconducting Materials and Applications
- Relativity and Gravitational Theory
- Advanced Combinatorial Mathematics
- Solar and Space Plasma Dynamics
Fermi National Accelerator Laboratory
2016-2025
Brookhaven National Laboratory
2020-2022
University of Southampton
2020
Karlsruhe Institute of Technology
2019
Institute for Basic Science
2019
Niels Brock
2018
University of Copenhagen
2018
Universidad Autónoma de Madrid
2018
The University of Tokyo
2018
Uppsala University
2018
A nontrivial squared helicity amplitude is given for the scattering of an arbitrary number gluons to lowest order in coupling constant and leading colors.Received 17 March 1986DOI:https://doi.org/10.1103/PhysRevLett.56.2459©1986 American Physical Society
Analytic results are presented for the probability of detecting an electron neutrino after passage through a resonant oscillation region. If is produced far above resonance density, this simply given by $〈{P}_{{\ensuremath{\nu}}_{e}}〉\ensuremath{\approx}{sin}^{2}{\ensuremath{\theta}}_{0}+{P}_{x}cos2{\ensuremath{\theta}}_{0}$, where ${\ensuremath{\theta}}_{0}$ vacuum mixing angle. The averaged over production as well detection positions and ${P}_{x}$ Landau-Zener transition between adiabatic...
We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, particle physics in each case viewed both theoretical experimental/observational perspectives. After reviewing the role active neutrinos physics, we focus on context Matter puzzle. Here, first motivation for based challenges tensions purely cold scenarios. then round out discussion by critically summarizing known...
We show how to observe sizable angular correlations between the decay products of top quark and those antiquark in pair production at hadron colliders. These result from large asymmetry rate for producing like-spin versus unlike-spin pairs provided appropriate spin axes are used. The effects new physics or on these briefly discussed. \textcopyright{} 1996 American Physical Society.
We show that by combining high precision measurements of the atmospheric $\ensuremath{\delta}{m}^{2}$ in both electron and muon neutrino (or antineutrino) disappearance channels one can determine mass hierarchy. The required is a very challenging fraction per cent for measurements. At even higher precision, sensitivity to cosine $CP$ violating phase also possible. This method determining hierarchy sector does not depend on matter effects.
Unitarity is a fundamental property of any theory required to ensure we work in theoretically consistent framework. In comparison with the quark sector, experimental tests unitarity for 3x3 neutrino mixing matrix are considerably weaker. It must be remembered that vast majority our information on angles originates from $\overline{\nu}_e$ and $\nu_\mu$ disappearance experiments, assumption being invoked constrain remaining elements. New physics can invalidate this subset thus modify precision...
We inspect recently updated neutrino oscillation data---specifically coming from the Tokai to Kamioka and NuMI Off-axis ${\ensuremath{\nu}}_{e}$ Appearance experiments---and how they are analyzed determine whether mass ordering is normal (${m}_{1}<{m}_{2}<{m}_{3}$) or inverted (${m}_{3}<{m}_{1}<{m}_{2}$). show that, despite previous results giving a strong preference for ordering, with newest data T2K NOvA, this has all but vanished. Additionally, we highlight importance of result...
If $A$ is an $n \times n$ Hermitian matrix with eigenvalues $\lambda _1(A),\dots ,$ _n(A)$ and $i,j = 1,\dots ,n$, then the $j$th component $v_{i,j}$ of a unit eigenvector $v_i$ associated to eigenvalue _i(A)$ related _1(M_j),\dots _{n-1}(M_j)$ minor $M_j$ formed by removing row column formula \begin{equation*} |v_{i,j}|^2\prod _{k=1;k\neq i}^{n}\left (\lambda _i(A)-\lambda _k(A)\right )=\prod _{k=1}^{n-1}\left _k(M_j)\right ). \end{equation*} We refer this identity as
The production cross section and distributions of the top quark are sensitive to new physics; e.g., $t\overline{t}$ system can be a probe resonances or gauge bosons that strongly coupled quark, in analogy with Drell-Yan production. existence such physics is expected dynamical electroweak symmetry-breaking schemes, associated large mass quark. total more than doubled, significantly distorted chosen scale \ensuremath{\sim} 1 TeV vector color singlet octet $s$ channel. New resonance most...
At a 14 TeV proton-proton collider, the Large Hadron Collider (LHC), we show that top quark pair production is dominated at low invariant mass by fusion of two like-helicity gluons, producing pairs in left-left or right-right helicity configurations. Whereas, higher unlike-helicity up-down down-up off-diagonal configurations, identical to via quark-antiquark annihilation. We study detail region, and spin correlations can be easily observed this region looking distribution difference...
The cross section for exciting simple atoms by slowly moving magnetic monopoles is calculated. Including the effects of monopole field on atomic energy levels, an loss per unit density obtained that much larger than previous studies. For helium $(\frac{1}{\ensuremath{\rho}})\frac{\mathrm{dE}}{\mathrm{dx}}=15(\frac{\ensuremath{\beta}}{{10}^{\ensuremath{-}4}}){[1\ensuremath{-}{(9.29\ifmmode\times\else\texttimes\fi{}\frac{{10}^{\ensuremath{-}5}}{\ensuremath{\beta}})}^{2}]}^{\frac{3}{2}}$ MeV...
We further develop and extend a recent perturbative framework for neutrino oscillations in uniform matter density so that the resulting oscillation probabilities are accurate complete potential versus baseline divided by energy plane. This extension also gives exact vacuum all values of energy. The expansion parameter used is related to ratio solar atmospheric $\Delta m^2$ scales but with unique choice such certain first-order effects taken into account zeroth-order Hamiltonian. Using mixing...
The scalar nonstandard interactions (NSI) can also introduce matter effect for neutrino oscillation in a medium. Especially the recent Borexino data prefer nonzero NSI, η_{ee}=-0.16. In contrast to conventional vector type contributes as correction mass matrix rather than potential. Consequently, is energy independent while one scales linearly with energy. This leads significantly different phenomenological consequences reactor, solar, atmospheric, and accelerator oscillations. A synergy of...
We revisit, reformulate, and extend a method for determining the neutrino mass ordering by using precision measurements of atmospheric <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi mathvariant="normal">Δ</a:mi><a:msup><a:mi>m</a:mi><a:mn>2</a:mn></a:msup><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi mathvariant="normal">s</a:mi></a:math> in both electron muon disappearance channels, first proposed authors 2005 [H. Nunokawa , ]. The is very important outstanding...
We show in single top quark production that the spin of is correlated with direction d-type event. For W* channel, comes dominantly from antiproton at Tevatron, whereas for W-gluon fusion channel spectator jet majority time this machine. Our results are 98% quarks process have their spins direction, and 96% direction. also compare more traditional, but less effective, helicity basis. The reflected angular correlations its decay products.
The results of a detailed calculation the effects resonant neutrino oscillations in sun on current and proposed solar-neutrino experiments are presented. Analytic used for electron-neutrino survival probability so that sophisticated model both production distribution solar sources electron-number density can be employed. Contour plots capture rate, plane mass difference squared versus vacuum mixing angle, given $^{37}\mathrm{Cl}$ experiment $^{71}\mathrm{Ga}$ detector.
We show that the exact monopole and dyon solutions found by Prasad Sommerfield are stable proving they absolute minima of energy.Received 2 June 1976DOI:https://doi.org/10.1103/PhysRevD.15.544©1977 American Physical Society
The MINOS experiment at Fermilab has recently reported a tension between the oscillation results for neutrinos and antineutrinos. We show that this tension, if it persists, can be understood in framework of nonstandard neutrino interactions (NSI). While neutral current NSI (nonstandard matter effects) are disfavored by atmospheric neutrinos, new charged coupling tau nucleons fit data without violating other constraints. In particular, we loop-level contributions to flavor-violating...