Internal structure modification and decay of hadrons in strong magnetic field

2015 ◽  
Vol 39 ◽  
pp. 1560114
Author(s):  
Peter Filip
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
External Magnetic Field ◽  
Internal Structure ◽  
Strong Magnetic Field ◽  
Structure Modification ◽  
Decay Channels ◽  
Enhanced Production ◽  
Decay Products ◽  
Sufficient Strength

We discuss the influence of external magnetic field on strong decays of [Formula: see text], [Formula: see text] and [Formula: see text] mesons. Due to increasing energy of [Formula: see text] Landau level of charged decay products, particular decay channels may become suppressed and isospin rules for strong decays can be violated. In the case of [Formula: see text] meson, enhanced production of photons and dileptons (with modified invariant mass) may occur. Similar considerations are applied to decays of [Formula: see text] baryon. We also suggest that static electromagnetic field of sufficient strength can modify the internal structure (wavefunction) of [Formula: see text] J/[Formula: see text] and [Formula: see text] mesons, and specific decay channels (e.g. CP — violating [Formula: see text]) can become enhanced.

An Investigation of the Behaviour of Magnetorheological Fluids in the Rotary Shock-Absorber

2012 ◽  
Vol 628 ◽  
pp. 512-517 ◽  
Author(s):  
Sławomir Kciuk ◽  
Monika Kciuk ◽  
Roman Turczyn ◽  
Paweł Martynowicz
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Structure Formation ◽  
Internal Structure ◽  
Carbonyl Iron ◽  
Shock Absorber ◽  
Experimental Studies ◽  
Magnetorheological Fluids ◽  
Control Current

The main aim of the article was to present the investigation results of created megnetorheological fluids using carbonyl iron (CI) particles and analyse their behaviour in terms of the internal structure formation by a control of external magnetic field. Results of the experimental studies of a prototype magnetorheological rotary shock-absorber at various magnitudes of control current was presented in this paper.

Regulation Behavior of Microwave Reflectivity in Magnetorheological Fluids

2011 ◽  
Vol 413 ◽  
pp. 213-216
Author(s):  
Ji Jun Fan ◽  
Nan Hui Yu
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
External Magnetic Field ◽  
Field Strength ◽  
Internal Structure ◽  
Magnetic Field Strength ◽  
Particle Concentration ◽  
Microwave Frequency ◽  
Microwave Reflection ◽  
The Given

In this paper, experimental study of the microwave reflection behavior in MRF was carried out. The results showed that at the same frequency the microwave reflectivity of MRF decreased with the increasing of magnetic field strength; and with the increasing of particle concentration, microwave reflectivity decreased, monotonously. Under the given magnetic field, with the increasing of microwave frequency, it first decreased, there is a lowest point at 9.2GHz, and then it increased. Usually, it is considered that the change of internal structure of MRF under external magnetic field is the main reason for the regulation behavior of microwave reflectivity.

Interaction of External Acoustic Waves - Confined Electrons - Internal Phonons in a Cylindrical Quantum Wire with an Infinite Potential in the Presence of an External Magnetic Field

2018 ◽  
Vol 783 ◽  
pp. 62-72
Author(s):  
Nguyen Vu Nhan ◽  
Nguyen Van Nghia ◽  
Nguyen Quyet Thang ◽  
Nguyen Quang Bau
Keyword(s):  
Magnetic Field ◽  
Kinetic Equation ◽  
External Magnetic Field ◽  
Quantum Wells ◽  
Strong Magnetic Field ◽  
Acoustic Waves ◽  
Quantum Wire ◽  
Heisenberg Equation ◽  
Quantum Kinetic Equation ◽  
System Temperature

Interaction of external acoustic waves - confined electrons - internal phonons in a cylindrical quantum wire with an infinite potential (CQWIP) has been theoretically studied via the quantum kinetic equation for electrons in the presence of an external magnetic field (EMF). The quantum kinetic equation for the distribution function of electrons interacting with internal and external acoustic phonons is obtained from the Heisenberg equation of motion and the model of CQWIP. The density of acoustomagnetoelectric (AME) current and the analytical expressions for the AME field in the CQWIP in the presence of the EMF are obtained. The theoretical results are numerically evaluated for the specific CQWIP of GaAs/GaAsAl. It is shown that the AME field strongly depends on the system temperature in both cases of the strong magnetic field and the weak magnetic field. However, the graph showing the relationship between the AME field and the system temperature has the peaks in case of the strong magnetic field. The reason may be due to movement of the electrons between the mini-bands. The AME field obtained in this work are then compared with those of bulk semiconductors, superlattices, quantum wells (QW) and rectangular quantum wire (RQW).

scholarly journals Deconfinement of heavy quarks at finite density and strong magnetic field

2020 ◽  
Vol 229 (22-23) ◽  
pp. 3387-3394
Author(s):  
Michał Szymański
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Heavy Quark ◽  
Critical Point ◽  
Strong Magnetic Field ◽  
Chemical Potential ◽  
Heavy Quarks ◽  
Polyakov Loop ◽  
Finite Density ◽  
Simultaneous Effect

AbstractWe study the simultaneous effect of the external magnetic field and finite chemical potential on deconfinement of heavy quarks, probed by the Polyakov loop and its fluctuations. We calculate the Polyakov loop, its real and imaginary susceptibilities, their ratio, as well as the heavy quark and anti-quark entropies. We find that these quantities are sensitive probes of deconfinement. Especially, the real Polyakov loop susceptibility and heavy quark and anti-quark entropies diverge at the critical point.

The Experiment Research on the Fluid Magnetic Abrasives

2012 ◽  
Vol 522 ◽  
pp. 3-7
Author(s):  
Wei Dong Li ◽  
Ming Lv
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Rheological Property ◽  
Strong Magnetic Field ◽  
Micro Structure ◽  
Experiment Research ◽  
Intelligent Material ◽  
New Type ◽  
Magnetic Abrasives

The fluid magnetic abrasive (FMA) is a new type of intelligent material. The fluid magnetic abrasive (FMA) has typical liquid characteristics, when there is no external magnetic field around it. But when a strong magnetic field is applied, the viscosity of it will increase more than 100 times within a few milliseconds, and it will show the characteristics those are resemble to solid's. We call this feature as rheological property, of which because the workpiece can be finished by fluid magnetic abrasive (FMA). On base of researching on the micro-structure of fluid magnetic abrasive (FMA), the experiments and results are presented in this paper.

Theoretical and experimental study on the effect of the external strong magnetic field on the shaped charge jet

2017 ◽  
Vol 31 (03) ◽  
pp. 1750018 ◽  
Author(s):  
B. Ma ◽  
Z. X. Huang ◽  
X. D. Zu ◽  
Q. Q. Xiao ◽  
X. Jia
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Strong Magnetic Field ◽  
Shaped Charge ◽  
Coupling Mechanism ◽  
Field Coupling ◽  
Magnetic Field Coupling ◽  
Shaped Charge Jet ◽  
Breakup Time ◽  
The Magnetic Field

The external strong magnetic field coupling with shaped charge is an effectively method to increase the penetration capability of the shaped charge jet. In this study, a theoretical model was developed to analyze the effect of the external strong magnetic field on breakup time and inhibition of rotation and drift of the shaped charge jet. The discharge current of the circuit system and the magnetic field of the shaped charge jet undergoing were calculated in detail. A series of depth of penetration (DOP) experiments were conducted to analyze the coupling mechanism between the external magnetic field and the shaped charge jet. Theoretical and experimental results indicated that the external strong magnetic field coupling with shaped charge jet can effectively improve the stability of the shaped charge jet, which the magnetic field can delay its breakup time and inhibit its rotation and drift. The ability of penetration of the jet produced by the Ø56 mm shaped charge is increased by 69.13% under the action of the external magnetic field.

Model Fokker—Planck Equations: Part 3. Application to transport phenomena

1967 ◽  
Vol 1 (3) ◽  
pp. 327-339 ◽  
Author(s):  
J. P. Dougherty ◽  
S. R. Watson ◽  
M. A. Hellberg
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Strong Magnetic Field ◽  
Transport Phenomena ◽  
Transport Coefficients ◽  
Planck Equation ◽  
Fokker Planck Equation ◽  
Complete Set ◽  
Fokker Planck Equations ◽  
Fokker Planck

The Chapman—Enskog expansion is applied to the model Fokker—Planck equation for a plasma, derived in part 2. It is shown that the complete set of transport coefficients can be calculated without further approximations. Results are derived first in the absence of any external magnetic field. The transport coefficients are also derived when there is a strong magnetic field, in which case they become anisotropic.

scholarly journals Production Cross Sections of Axion in a Static Electromagnetic Field

2013 ◽  
Vol 23 (1) ◽  
pp. 21
Author(s):  
Dang Van Soa ◽  
Tran Dinh Tham
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Total Cross Section ◽  
Strong Magnetic Field ◽  
Cross Section ◽  
Cross Sections ◽  
Feynman Diagram ◽  
Production Cross ◽  
The Cross

Photon - axion conversions in staticelectromagnetic fields of the size \(a\times b \times c\) areconsidered in detail by the Feynman diagram methods. Thedifferential cross sections are presented and the numericalevaluations of the total cross section are given. Our result showsthat the conversion cross-sections in the electric field are quitesmall, while in the strong magnetic field, the cross-sections are much enhanced, which can be measurable in current experiments.

scholarly journals On the photon-pseudoscalar particle mixing in media and external fields

2021 ◽  
Vol 81 (5) ◽  
Author(s):  
Damian Ejlli
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
External Magnetic Field ◽  
Equations Of Motion ◽  
Magnetized Plasma ◽  
Arbitrary Direction ◽  
Particle Mixing ◽  
Field State ◽  
Pseudoscalar Particle ◽  
First Time

AbstractIn this work, I study the mixing of photons with pseudoscalar particles and vice-versa in the presence of an external magnetic field and a pseudoscalar field. I solve exactly for the first time in the literature the equations of motion of the electromagnetic field coupled with a pseudoscalar field in the presence of a constant magnetic field with arbitrary direction with respect to the direction of propagation of the fields in vacuum. In addition, I also solve exactly the equations of motion in a magnetized plasma/gas for perpendicular propagation with respect to the external magnetic field. By finding exact solutions to the equations of motion, I find exact expressions for the transition efficiencies of photons into pseudoscalar particles in different situations. The expressions of the transition efficiencies generalize and correct those previously found in the literature by using approximate WKB methods on solving the equations of motion. In the case when the direction of propagation of fields with respect to the external magnetic field is not perpendicular, a longitudinal state of the electromagnetic field is generated even in a magnetized vacuum. The appearance of the longitudinal electric field state could be used for laboratory searches of pseudoscalar particles such as the axion and/or axion-like particles.

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