abstract provided as attached pdf-file
for abstract see attached pdf-file
text provided in the uploaded pdf
Cold molecular ions prepared by sympathetic cooling with laser-cooled atomic ions in an ion trap represent attractive systems for new spectroscopic experiments. The long trapping times (up to hours) and state lifetimes (up to minutes) [1,2] in an almost perturbation-free environment enable the long interaction times required for the study of “forbidden” spectroscopic transitions which have not...
for abstract see attached pdf-file
abstract provided as attached pdf-file
abstract as attachement
for abstract see attached pdf-file
abstract provided as attached pdf-file
Extra fundamental short-range interactions mediated by new bosons are predicted in many extentions of the Standard Model of particle physics. They are also predicted in theories with large extra spatial dimentions and theories involving the light dark matter hypothesis.
To search for such interactions at different charateristic distances, the experimentalists use many methods including...
We describe recent developments in tests of quantum-electrodynamics (QED),
the theory of the interactions of matter with electro-magnetic fields and forces. The tests focus on consistency in the determination of parameters or constants within QED obtained via multiple independent means and, in particular, by comparisons of precision measurements with, equivalently accurate, theoretical...
For abstract see attached pdf-file.
text provided in the uploaded pdf
text provided in the uploaded pdf
abstract provided as attached pdf-file
for abstract see the attached pdf-file
Single particles in traps allow for clean investigations of basic interactions and also for the determination of fundamental constants. This has been demonstrated by investigations of Quantum Electrodynamics (QED) with respect to the g-factor of the free electron [1] and of hydrogen-like or lithium-like ions [2 - 4], which form the most precise determinations of the fine-structure constant and...
The polarizability in atomic physics is important to determining the frequency standard [1], magic wavelengths and the tune-out wavelengths [2,3] of the atom in the optical lattice clock. It is also used to calculating the long-range interactions between atoms [4], in the cold atom research. However the higher order corrections are still researched inadequately [1,5].
In this work, starting...
please see the attached file for abstract
for abstract see attached pdf file
We consider bound states between an atomic nucleus and a muon,
so called muonic atoms. Especially for high charge numbers, the sur-
rounding atomic electrons do not influence the muon and the system
is essentially hydrogenlike. Just as in normal atoms, there is fine and
hyperfine splitting, but the significance of the various contributions
differs dramatically. In particular, nuclear...
text provided in the uploaded pdf
Abstract provided in the attachment.
For abstract see attached pdf-file.
We present a new method of spectroscopy, utilizing a drift effect to disperse
charged particles in a uniformly curved magnetic field. The curved field results
in a drift of the charged particles perpendicular to the radius of the curvature
and to the magnetic field, which is proportional to the particle’s momentum.
A spatial-resolving detector will determine the momentum spectra.
The first...
For abstract, please see attached PDF file.
For abstract, please see the attached PDF file.
text provided in the uploaded pdf
abstract as attachement
abstract provided as attached pdf-file
see uploaded abstract file
Abstract is provided as attached pdf-file.
text provided in the uploaded pdf
At present a theoretical prediction for the spin-averaged frequency of vibrational transitions in the hydrogen molecular ions (HMI) has reached a relative precision of $\sim\!7.5\!\times\!10^{-12}$ [1]. On the other hand, recent experiment [2] on pure rotational transition in HD$^+$ has demonstrated the power of the Lamb-Dicke regime for precision spectroscopy of the HMI and potentiality in...
for abstract see attached pdf file
text provided in the uploaded pdf
text provided in the uploaded pdf
text provided in the uploaded pdf
Text provided in the uploaded pdf.
Laser spectroscopy of atomic hydrogen is a source of valuable data for a least-square adjustment of fundamental constants and precise tests of QED. Further improvement of precision of those measurements is of key interests for a problem, known as a Proton Size Puzzle \cite{Antognini2013}. This work requires suppression of different systematic effects, including a Doppler shift. Cooling the...
\documentclass[11pt,a4paper]{article}
%\documentstyle[epsf,12pt]{article}
\usepackage{epsfig}
\usepackage{graphicx}
\usepackage{eurosym}
\usepackage{multicol}
\usepackage{subfig}
\usepackage{caption}
\usepackage{times}[11pt]
\usepackage{geometry}
\geometry{a4paper, portrait, margin=3cm}
%\textwidth = 15.59cm
%\hoffset = -0.54cm
%\topmargin = 0.5cm
%\headheight = 0.5cm
%\headsep...
For abstract see the attached pdf file.
Towards a search for Dark Matter using atomic Dysprosium
A. Sharma a,b, M. Leyser a,b, A. V. Viatkina a,b, L. Bougas a,b and D. Budker a,b
a Helmholtz Institut Mainz (HIM), Johannes Gutenberg Universitat, Mainz 55128, Germany
b Institut fur Physik, Johannes Gutenberg Universitat, Mainz 55128, Germany
Studies of rotation curves of galaxies, initiated by Oort & Zwicky (1930’s) and...
In diatomic systems, the rich and varied spectra and nearly degenerate energy levels provide huge enhancements for tiny physical effects, making it possible to look for new physics beyond the Standard Model in a single experiment. Nuclear-spin dependent parity-violating interactions and nuclear-anapole-moment effects in diatomic molecules in particular provide precise test of the electroweak...
abstract provided as attached pdf-file
ALPHATRAP is a high-precision Penning-trap based experiment dedicated to the exploration of ground-state properties of heavy, highly charged ions (HCI). The major goal of ALPHATRAP is the measurement of the bound-electron gyromagnetic factor, or $\textit{g}$-factor, which can be predicted to very high precision in the framework of bound-state quantum electrodynamics (BS-QED). The comparison of...
for abstract see attached pdf-file
text provided in the uploaded pdf
for abstract see attached pdf-file.
The 1S-2S two-photon transition frequency in hydrogen can be measured most accurately compared to other transitions in hydrogen due to its narrow natural linewidth, and serves as a corner stone for fundamental constants. However, only a combination of the precisely known 1S-2S transition with additional measurements allows to extract specific constants such as the proton root mean square...
abstract provided as attached pdf-file
For abstract please see the attached pdf.
Please see the attached pdf file for the abstract.
text provided in the uploaded attachment
See attached pdf document
We critically examine the current status of theoretical calculations of the energies and the isotope shift of the lowest-lying states of helium, searching for unresolved discrepancies with experiments. Calculations are performed within the nonrelativistic quantum electrodynamics ex- pansion in powers of the fine structure constant α and the electron-to-nucleus mass ratio m/M. For energies,...
Positronium is an excellent system to test bound state QED theory to very high precision, since it is almost exlusively governed by the electromagnetic force and does not exhibit the finite size effects which plague measurements of protonic atoms.
Numerous precise experiments have therefore been conducted in the past to measure the hyperfine splitting of Positronium. However, these...
Positronium spectroscopy is of continuing interest as a high-precision test of our understanding of binding in QFT. Positronium represents the purest example of binding in QFT as the constituents are structureless and their interactions are dominated by QED with only negligible contributions from strong and weak effects. Positronium differs from other Coulombic bound systems such as...
text provided in the uploaded pdf
Theoretical studies of hydrogen molecule is the cornerstone of the molecular quantum mechanics. Due to its simplicity, the achieved precision is the highest among all molecules and still has a potential of significant enhancement. This high precision of theoretical predictions for H$_2$ leads to improved tests of quantum electrodynamics (QED) and improved bounds on hypothetical interactions....
Molecular hydrogen has emerged as a benchmark quantum test system for fundamental physics, where current high-precision measurements challenge the most accurate theoretical calculations that include relativistic and quantum electrodynamics (QED) contributions. Investigations on isotopic molecular species containing deuterium and tritium provide opportunities to expand such fundamental tests,...
Text provided in the uploaded pdf.
text provided in the uploaded pdf
for abstract please see the attached pdf file
I shall review the results obtained in recent years in the experimental studies of exotic atoms, in particular on hadronic atoms.
I shall mostly focus on the studies of kaonic atoms performed at the DAFNE collider of LNF-INFN and at J-PARC in Japan, which have produced a valuable wealth of data which are used by theoreticians to better understand the QCD in non-perturbative sector, with...
text provided in the uploaded pdf
The proton is a fundamental constituent of the matter. However, it has a complicated internal structure which is difficult to be fully understood. The internal structure of the proton is described by the electronic and magnetic form factors. The charge radius of the proton is defined by these form factors and has been determined experimentally. In recent years, a significant discrepancy...
abstract provided as attached pdf-file
Precision spectroscopy in few-body atomic systems, like hydrogen and helium, enables the testing of the quantum electrodynamics(QED) theory and determination of the fundamental physical constants, such as the Rydberg constant~\cite{2013H}, the proton charge radius~\cite{2009Biraben_HydrogenReview}, and the fine-structure constant~\cite{2010Pachucki,2017Zheng}. It also sets constraints on new...
for abstract see the attached pdf-file
text provided in the uploaded pdf
As the simplest system, Li+ has significant application in verifying the quantum electrodynamics (QED) theory and determination of the fine-structure constant, because the spectrum of Li+ ion can be calculated accurately in theory. We constructed a low energy Li+ source by electron bombardment, and energy of the 7Li+ ions is 500 eV. The 1s2s 3S -1s2s 3P transitions of 7Li+ are investigated by...
We study, using the formalism proposed by Dalibard, Dupont-Roc, and Cohen-Tannoudji, the resonance interatomic energy (RIE) of two identical two-level static atoms in a symmetric/antisymmetric entangled state, which are coupled to massless scalar fields, in a number of different spacetimes. We first show that the presence of a boundary in a flat Minkowski spacetime can dramatically modify the...
For abstract see attached pdf file.
abstract provided as attached pdf-file
This is a Precision measurement plays an important role in unveiling new physics by probing beyond the known boundaries of knowledge. In a similar footing, it has a wide range of application in trade and commerce. From fundamental physics viewpoint, the Standard Model (SM) of particle physics though considered to be the most celebrated model in physics is known to have shortcomings as is...
abstract provided as attached pdf-file
The accuracy of the molecular spectroscopy on weak transitions (too weak to saturate) in molecules which cannot be cooled and trapped, is presently limited to the sub-megahertz level, without clear perspectives for further substantial improvements. We demonstrate a new method with the potential to achieve kilohertz-level accuracy. We bring the Doppler-regime measurements into the high-pressure...
The dissociation energy (D$_0$) of H$_2$ is a benchmark value in quantum chemistry, with recent QED calculations now approaching accuracies achievable in simple atoms. Precise measurement of the GK-X molecular transition, in combination with other precision measurements, provides a determination of D$_0$. The GK-X transition is excited through Doppler-free two-photon spectroscopy using 179-nm...
for abstract see attached pdf file
text provided in the uploaded pdf
text provided in the uploaded pdf
for abstract see attached pdf-file
text provided in the uploaded pdf
The BESIII experiment at BEPCII accumulated the world's largest $e^+e^-$ collision samples at 3.773 and 4.178 GeV. We have studied the purely leptonic decays $D^+_{(s) }\to l^+v$, and the semi-leptonic decays of $D^0\to K(\pi)^-e^+v_e$, $K(\pi)^-\mu^+v_\mu$, $D^+\to\bar K^0(\pi^0)e^+v_e$, $\bar K^0(\pi^0)\mu^+v_\mu$ and $D_s^+\to K^{(*)0}e^+v_e$. We will report the improved measurements of the...
After a short review of the overall physics program of BESIII and the key features of the BEPCII collider and BESIII detector, I will present some of the recent highlights of the charmonium(-like) spectroscopy program of BESIII. The results include measurements of radiative and hadronic decays of several charmonium(-like) states below and above the open-charm production threshold. The ultimate...
The construction of the low-energy $e^+e^-$ collider ($\mu\mu$tron)
operating near the muon-pair production threshold begins in 2018 at
BINP (Novosibirsk). The collider parameters and configuration
(a luminosity of $8\times 10^{31}$ cm$^{-2}$c$^{-1}$), an center-of-mass
energy spread of 400 keV, and beams collision with a large crossing angle)
allow to perform experiments on study of dimuonium...
Spherical neutral detector (SND) is an experiment for $e^{+}e^{-}$ annihilation study at moderate energies 0.2-2 GeV. The light quark anti-quark bound states are main subject of study at these energies. The quark anti-quark states express themselves as resonances in the e+e- ->hadronic cross sections. The hadronic cross sections could be recalculated to hadronic vacuum polarization (HVP). The...
