Quark structure and radiative decays of new particles

We present research on radiative decays of vector [Formula: see text] to pseudoscalar [Formula: see text] particles ([Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] quark system) using broken symmetry techniques in the infinite-momentum frame and equal-time commutation relations and the [Formula: see text] Lie algebra, and conducted without ascribing any specific form to meson quark structure or intra-quark interactions. We utilize the physical electromagnetic current [Formula: see text] including its singlet [Formula: see text] term and focus on the [Formula: see text] 35-plet. We derive new relations involving the electromagnetic current (including its singlet — proportional to the [Formula: see text] singlet). Remarkably, we find that the electromagnetic current singlet plays an intrinsic role in understanding the physics of radiative decays and that the charged and neutral [Formula: see text] meson radiative decays into [Formula: see text] are due entirely to the singlet term in [Formula: see text]. Although there is insufficient radiative decay experimental data available at this time, parametrization of possible predicted values of [Formula: see text] is made. For conciseness and self-containment, we compute all [Formula: see text] Lie algebra simple roots, positive roots, weights and fundamental weights which allow the construction of all [Formula: see text] representations. We also derive all nonzero [Formula: see text] generator commutators and anticommutators — useful for further research on grand unified theories.

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Mass spectra of the new particles and theψ′radiative decays

Physical Review D ◽

10.1103/physrevd.14.1463 ◽

1976 ◽

Vol 14 (5) ◽

pp. 1463-1466

Author(s):

Malcolm H. Mac Gregor

Keyword(s):

Mass Spectra ◽

Radiative Decays ◽

New Particles

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Quark structure of the $$\chi _{\mathrm{c}}(3P)$$ and X(4274) resonances and their strong and radiative decays

The European Physical Journal C ◽

10.1140/epjc/s10052-020-8032-5 ◽

2020 ◽

Vol 80 (5) ◽

Cited By ~ 1

Author(s):

J. Ferretti ◽

E. Santopinto ◽

M. Naeem Anwar ◽

Yu Lu

Keyword(s):

Radiative Decays ◽

Quark Structure

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New Particles

10.1093/oso/9780198827870.003.0007 ◽

2018 ◽

Author(s):

Roger H. Stuewer

Keyword(s):

Gamma Rays ◽

Atomic Hydrogen ◽

Nuclear Physics ◽

Hydrogen Isotope ◽

Alpha Particles ◽

Cloud Chamber ◽

Ernest Rutherford ◽

James Chadwick ◽

Theoretical Foundations ◽

New Particles

In December 1931, Harold Urey discovered deuterium (and its nucleus, the deuteron) by spectroscopically detecting the faint companion lines in the Balmer spectrum of atomic hydrogen that were produced by the heavy hydrogen isotope. In February 1932, James Chadwick, stimulated by the claim of the wife-and-husband team of Irène Curie and Frédéric Joliot that polonium alpha particles cause the emission of energetic gamma rays from beryllium, proved experimentally that not gamma rays but neutrons are emitted, thereby discovering the particle whose existence had been predicted a dozen years earlier by Chadwick’s mentor, Ernest Rutherford. In August 1932, Carl Anderson took a cloud-chamber photograph of a positron traversing a lead plate, unaware that Paul Dirac had predicted the existence of the anti-electron in 1931. These three new particles, the deuteron, neutron, and positron, were immediately incorporated into the experimental and theoretical foundations of nuclear physics.

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Search for New Particles Decaying tobb¯inpp¯Collisions at√s=1.8TeV

Physical Review Letters ◽

10.1103/physrevlett.82.2038 ◽

1999 ◽

Vol 82 (10) ◽

pp. 2038-2043 ◽

Cited By ~ 22

Author(s):

F. Abe ◽

H. Akimoto ◽

A. Akopian ◽

M. G. Albrow ◽

A. Amadon ◽

...

Keyword(s):

New Particles

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Hidden-charm and radiative decays of theZ(4430)as a hadronicD1D¯*bound state

Physical Review D ◽

10.1103/physrevd.82.054025 ◽

2010 ◽

Vol 82 (5) ◽

Cited By ~ 33

Author(s):

Tanja Branz ◽

Thomas Gutsche ◽

Valery E. Lyubovitskij

Keyword(s):

Bound State ◽

Radiative Decays

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On the constituent quark structure

10.1063/1.48172 ◽

1995 ◽

Author(s):

Adam Szczepaniak ◽

Chueng-Ryong Ji ◽

Stephen R. Cotanch

Keyword(s):

Constituent Quark ◽

Quark Structure

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Particle Size, Structure and Powdering Process of Calcium Carbonate Nanoparticles Filled Powdered Styrene-Butadiene Rubber

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.415-417.237 ◽

2011 ◽

Vol 415-417 ◽

pp. 237-242

Author(s):

Zhou Da Zhang ◽

Xue Mei Chen ◽

Guo Liang Qu

Keyword(s):

Particle Size ◽

Calcium Carbonate ◽

Size Structure ◽

Average Diameter ◽

Rubber Matrix ◽

Styrene Butadiene Rubber ◽

Butadiene Rubber ◽

Particle Structure ◽

Styrene Butadiene ◽

New Particles

Calcium carbonate nanoparticles (nano-CaCO3) filled powdered styrene-butadiene rubber (P(SBR/CaCO3) was prepared by adding nano-CaCO3 particles, encapsulant and coagulant to styrene-butadiene rubber (SBR) latex by coacervation, and the particle size distribution, structure were studied. Scanning electron microscopy (SEM) was used to investigate the (P(SBR/CaCO3) particle structure, and a powdering model was proposed to describe the powdering process. The process includes: (i) the latex particles associated with the dispersed nano-CaCO3 particles (adsorption process) to form “new particles” and (ii) the formation of P(SBR/CaCO3) by coagulating “new particles”. The SEM results also shown that the nano-CaCO3 and rubber matrix have formed a macroscopic homogenization in the (P(SBR/CaCO3) particles and nano-CaCO3 dispersed uniformly in the rubber matrix with an average diameter of approximately 50 nm.

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