scholarly journals Spurious poles in the scattering of electric and magnetic charges

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
John Terning ◽  
Christopher B. Verhaaren
Keyword(s):  
Perturbation Theory ◽  
Scattering Amplitudes ◽  
Pair Production ◽  
Magnetic Particles ◽  
Single Photon ◽  
Low Energy ◽  
Magnetic Interactions ◽  
Parity Conservation ◽  
Non Local ◽  
The Way

Abstract Theories with both electric and magnetic charges (“mutually non-local” theories) have several major obstacles to calculating scattering amplitudes. Even when the interaction arises through the kinetic mixing of two, otherwise independent, U(1)’s, so that all low-energy interactions are perturbative, difficulties remain: using a self-dual, local formalism leads to spurious poles at any finite order in perturbation theory. Correct calculations must show how the spurious poles cancel in observable scattering amplitudes. Consistency requires that one type of charge is confined as a result of one of the U(1)’s being broken. Here we show how the constraints of confinement and parity conservation on observable processes manages to cancel the spurious poles in scattering and pair production amplitudes, paving the way for systematic studies of the experimental signatures of “dark” electric-magnetic processes. Along the way we demonstrate some novel effects in electric-magnetic interactions, including that the amplitude for single photon production of magnetic particles by electric particles vanishes.

scholarly journals The pole structure of low energy πN scattering amplitudes

2019 ◽  
Vol 199 ◽  
pp. 02004
Author(s):  
Yu-Fei Wang
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Scattering Amplitudes ◽  
Low Energy ◽  
Tree Level ◽  
Chiral Perturbation ◽  
Left Hand ◽  
Pole Structure ◽  
Pion Nucleon ◽  
Branch Cuts

This report presents an investigation of the pion-nucleon elastic scattering in low energy region using a production representation of the partial wave S matrix. The phase shifts are separated into contributions from poles and branch cuts, where the left-hand cut term can be evaluated by tree-level covariant baryon chiral perturbation theory. A comparison between the sum of known contributions and the data in S- and P- wave channels is made. It is found that the known components in S11 and P11 channels are far from enough to saturate the corresponding experimental data, indicating the existence of low-lying hidden poles. The positions of those hidden poles are figured out and the physics behind them are explored.

scholarly journals LIGHT SCALARS AS TETRAQUARKS OR TWO-MESON STATES FROM LARGE-Nc AND UNITARIZED CHIRAL PERTURBATION THEORY

2004 ◽  
Vol 19 (39) ◽  
pp. 2879-2894 ◽  
Author(s):  
J. R. PELÁEZ
Keyword(s):  
Perturbation Theory ◽  
Scattering Amplitudes ◽  
Chiral Perturbation Theory ◽  
Low Energy ◽  
Effective Theory ◽  
Chiral Perturbation ◽  
Large N ◽  
Light Scalar ◽  
Meson States

By means of unitarized Chiral Perturbation Theory it is possible to obtain a remarkable description of meson–meson scattering amplitudes up to 1.2 GeV, and generate poles associated to scalar and vector resonances. Since Chiral Perturbation Theory is the QCD low energy effective theory, it is then possible to study its large-N c limit where [Formula: see text] states are easily identified. The vectors thus generated follow closely a [Formula: see text] behavior, whereas the light scalar poles follow the large-N c behavior expected for a dominant tetraquark or two-meson structure.

Low-energy scattering parameters for van der Waals perturbation theory

1986 ◽  
Vol 33 (6) ◽  
pp. 3749-3755 ◽  
Author(s):  
L. P. Benofy ◽  
E. Buendía ◽  
R. Guardiola ◽  
M. de Llano
Keyword(s):  
Perturbation Theory ◽  
Van Der Waals ◽  
Low Energy ◽  
Scattering Parameters ◽  
Energy Scattering

scholarly journals Lepton pair production in heavy-ion collisions in perturbation theory

2002 ◽  
Vol 66 (4) ◽  
Author(s):  
E. Bartoš ◽  
S. R. Gevorkyan ◽  
E. A. Kuraev ◽  
N. N. Nikolaev
Keyword(s):  
Perturbation Theory ◽  
Pair Production ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Lepton Pair ◽  
Lepton Pair Production ◽  
Ion Collisions

scholarly journals Conformal Symmetry in Field Theory and in Quantum Gravity

Universe ◽  
2018 ◽  
Vol 4 (11) ◽  
pp. 125 ◽  
Author(s):  
Lesław Rachwał
Keyword(s):  
Field Theory ◽  
Scattering Amplitudes ◽  
Effective Action ◽  
Conformal Symmetry ◽  
Gravitational Theory ◽  
Fine Tuning ◽  
Conformal Anomaly ◽  
Conformal Theory ◽  
Conformally Invariant ◽  
Non Local

Conformal symmetry always played an important role in field theory (both quantum and classical) and in gravity. We present construction of quantum conformal gravity and discuss its features regarding scattering amplitudes and quantum effective action. First, the long and complicated story of UV-divergences is recalled. With the development of UV-finite higher derivative (or non-local) gravitational theory, all problems with infinities and spacetime singularities might be completely solved. Moreover, the non-local quantum conformal theory reveals itself to be ghost-free, so the unitarity of the theory should be safe. After the construction of UV-finite theory, we focused on making it manifestly conformally invariant using the dilaton trick. We also argue that in this class of theories conformal anomaly can be taken to vanish by fine-tuning the couplings. As applications of this theory, the constraints of the conformal symmetry on the form of the effective action and on the scattering amplitudes are shown. We also remark about the preservation of the unitarity bound for scattering. Finally, the old model of conformal supergravity by Fradkin and Tseytlin is briefly presented.

scholarly journals The MicroBooNE Single-Photon Low-Energy Excess Search

2020 ◽  
Author(s):  
Sowjanya Gollapinni ◽  
Georgia Karagiorgi ◽  
Mark Lonegran ◽  
William Louis ◽  
Richard Van De Water ◽  
...  
Keyword(s):  
Single Photon ◽  
Low Energy ◽  
Energy Excess

Preparation and Properties of Well-Defined Magnetic Particles

MRS Bulletin ◽  
1989 ◽  
Vol 14 (12) ◽  
pp. 35-40 ◽  
Author(s):  
Masataka Ozaki
Keyword(s):  
Drug Delivery Systems ◽  
Magnetic Particles ◽  
Magnetic Interactions ◽  
Recording Media ◽  
Magnetic Media ◽  
Magnetic Recording Media ◽  
Scientific Interest ◽  
Small Particles ◽  
Magnetic Dispersions ◽  
Geomagnetic Fields

Magnetic particles are important not only in the technology, but also in the function of some biosystems. In addition, they are of great scientific interest in developing a better understanding of magnetic phenomena. Ever since magnetic recording media were first prepared, extensive efforts have been made to produce improved magnetic dispersions. The particle s for magnetic media must be of single domain, high saturation magnetization, and proper coercive force. However, the magnetic interactions between such particles are very strong, and stable dispersions are difficult to obtain. Originally, their use was limited to audio tapes, but presently they are employed in a variety of applications. Thus, small particles of different magnetic properties are constituents of magnetic fluids.In 1975, magnetic particles were identified in the bodies of some bacteria, which can navigate along geomagnetic fields. It is also believed that certain animais have the ability to detect a magnetic field due to the presence of magnetic particles in their cells.Techniques are being developed to introduce new functions to materials by incorporating magnetic particles. For example, magnetic particles that are encapsulated by nonmagnetic compounds (e.g. polymers) or particles are used for binding and separating enzymes from reactant mixtures. Efforts are under way to use magnetic particles in drug delivery Systems and for diagnosis.

PROCEDURE FOR GENERATING EQUATIONS IN LINEAR SIGMA MODEL

2011 ◽  
Vol 26 (14) ◽  
pp. 2327-2352 ◽  
Author(s):  
AMIR H. FARIBORZ
Keyword(s):  
Scattering Amplitudes ◽  
Sigma Model ◽  
Point Interaction ◽  
Low Energy ◽  
Linear Sigma Model ◽  
Pseudoscalar Mesons ◽  
Decay Widths ◽  
Symmetry Breaking Term ◽  
The Masses ◽  
Breaking Term

A procedure for implementation of the generating equations in the linear sigma model of low energy QCD is presented. For any explicit symmetry breaking term, this procedure computes the masses of scalar and pseudoscalar mesons as well as various three-point and four-point interaction vertices that are needed in calculation of different decay widths and scattering amplitudes.

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