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Symmetry
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Advances in Spin Physics
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Advances in Spin Physics

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (28 February 2021) | Viewed by 11255

Special Issue Editor

Prof. Dr. Sergey Troshin

E-Mail Website
Guest Editor
Institute for High Energy Physics, 142280 Protvino, Moscow Oblast, Russia
Interests: spin physics

Special Issue Information

Dear Colleagues,

In recent years, there has been a steady progress in research activities related to spin phenomena in high energy physics and their theoretical interpretations. This Special Issue is devoted to the various aspects of studies related to the spin degrees of freedom and their manifestation in the structure of particles and in their interaction dynamics. Research on spin phenomena has now attracted a significant following of experimental and theoretical physicists, and therefore, both experimental and theoretical aspects of spin studies will be discussed in this issue, making it interesting for a wide audience in the high-energy physics community. The already obtained experimental results along with their interpretations and future prospects of spin studies will be treated. Emphasis under these discussions will be given to the spin-dependent measurements in further testing of QCD, the Standard Model, spin structute of hadrons studies, and role of spin in the nonperturbative regime of QCD with an impact on the possible confinement problem solution and impartance of spin for the spontaneous chiral symmetry-breaking phenomena.

Prof. Dr. Sergey Troshin
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • spin structure of proton
  • spin-dependent dynamics of particle interaction
  • intepretations of the results of spin mesurements
  • role of spin in confinement
  • program of spin studies with fixed target at the LHC in CERN
  • spin studies at the electron colliders
  • spin and supersymmetry
  • spin and electroweak interactions
  • spin and extensions of the Standard Model
  • searches for the new physics with the help of spin
  • role of spin in model construction.

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Published Papers (6 papers)

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Editorial

Jump to: Research, Review, Other

3 pages, 171 KiB  
Editorial
Special Issue: Advances in Spin Physics
by Sergey Mikhailovich Troshin
Symmetry 2022, 14(7), 1355; https://doi.org/10.3390/sym14071355 - 30 Jun 2022
Viewed by 913
Abstract
The notion of spin entered physics about one hundred years ago when Uhlenbeck and Goudsmit introduced the internal degree of freedom for the electron- spin as a real physical characteristics instead of the so called non-mechanical strength used at first by Pauli under [...] Read more.
The notion of spin entered physics about one hundred years ago when Uhlenbeck and Goudsmit introduced the internal degree of freedom for the electron- spin as a real physical characteristics instead of the so called non-mechanical strength used at first by Pauli under formulation of his famous principle [...] Full article
(This article belongs to the Special Issue Advances in Spin Physics)

Research

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20 pages, 623 KiB  
Article
Nucleon Structure and Spin Effects in Elastic Hadron Scattering
by Oleg Selyugin
Symmetry 2021, 13(2), 164; https://doi.org/10.3390/sym13020164 - 21 Jan 2021
Cited by 7 | Viewed by 2079
Abstract
Soft diffraction phenomena in elastic nucleon scattering are considered from the viewpoint of the spin dependence of the interaction potential. Spin-dependent pomeron effects are analyzed for elastic pp scattering, and spin-dependent differential cross sections and spin correlation parameters are calculated. The spin [...] Read more.
Soft diffraction phenomena in elastic nucleon scattering are considered from the viewpoint of the spin dependence of the interaction potential. Spin-dependent pomeron effects are analyzed for elastic pp scattering, and spin-dependent differential cross sections and spin correlation parameters are calculated. The spin correlation parameter AN is examined on the basis of experimental data from s=4.9 GeV up to 23.4GeV in the framework of the extended High Energy Generalized Structure (HEGS) model. It is shown that the existing experimental data of proton-proton and proton-antiproton elastic scattering at high energy in the region of the diffraction minimum and at large momentum transfer give the support of the existence of the energy-independent part of the hadron spin flip amplitude. Full article
(This article belongs to the Special Issue Advances in Spin Physics)
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12 pages, 306 KiB  
Article
Transverse–Spin Quark Distributions from Asymmetry Data and Symmetry Arguments
by Vincenzo Barone, Anna Martin and Franco Bradamante
Symmetry 2021, 13(1), 116; https://doi.org/10.3390/sym13010116 - 12 Jan 2021
Cited by 1 | Viewed by 1725
Abstract
The transversity and the Sivers distribution functions of quarks incorporate important information about the transverse-spin and transverse-momentum structure of nucleons. We show how these distributions can be directly determined point by point from leptoproduction asymmetry data collected for various targets and produced hadrons [...] Read more.
The transversity and the Sivers distribution functions of quarks incorporate important information about the transverse-spin and transverse-momentum structure of nucleons. We show how these distributions can be directly determined point by point from leptoproduction asymmetry data collected for various targets and produced hadrons by the COMPASS Collaboration. Only simple symmetry relations are used in the extraction. Full article
(This article belongs to the Special Issue Advances in Spin Physics)
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28 pages, 1170 KiB  
Article
Spin and Polarization in High-Energy Hadron-Hadron and Lepton-Hadron Scattering
by László Jenkovszky
Symmetry 2020, 12(11), 1784; https://doi.org/10.3390/sym12111784 - 28 Oct 2020
Cited by 5 | Viewed by 1869
Abstract
The role of spin degrees of freedom in high-energy hadron-hadron and lepton-hadron scattering is reviewed with emphasis on the dominant role of soft, diffractive, non-perturbative effects. Explicit models based on analyticity and Regge-pole theory, including the pomeron trajectory (gluon exchange in the t [...] Read more.
The role of spin degrees of freedom in high-energy hadron-hadron and lepton-hadron scattering is reviewed with emphasis on the dominant role of soft, diffractive, non-perturbative effects. Explicit models based on analyticity and Regge-pole theory, including the pomeron trajectory (gluon exchange in the t channel) are discussed. We argue that there is a single, universal pomeron in Nature, manifest as relatively “soft” or “hard”, depending on the kinematics considered. Both the pomeron and the non-leading (secondary) Regge trajectories, made of quarks are non-linear, complex functions. They are populated by a finite number of resonances: known baryons and mesons in case of the reggeons and hypothetical glueballs in case of the pomeron (“oddballs” on the odderon trajectory). Explicit models and fits are presented that may be used in recovering generalized parton distributions from deeply virtual Compton scattering and electoproduction of vector mesons. Full article
(This article belongs to the Special Issue Advances in Spin Physics)
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Review

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26 pages, 1194 KiB  
Review
Siberian Snakes, Figure-8 and Spin Transparency Techniques for High Precision Experiments with Polarized Hadron Beams in Colliders
by Yaroslav S. Derbenev, Yury N. Filatov, Anatoliy M. Kondratenko, Mikhail A. Kondratenko and Vasiliy S. Morozov
Symmetry 2021, 13(3), 398; https://doi.org/10.3390/sym13030398 - 28 Feb 2021
Cited by 9 | Viewed by 2863
Abstract
We present a review of the possibilities to conduct experiments of high efficiency in the nuclear and high energy physics with spin-polarized beams in a collider complex, configuration of which includes Siberian snakes or figure-8 collider ring. Special attention is given to the [...] Read more.
We present a review of the possibilities to conduct experiments of high efficiency in the nuclear and high energy physics with spin-polarized beams in a collider complex, configuration of which includes Siberian snakes or figure-8 collider ring. Special attention is given to the recently elicited advantageous possibility to conduct high precision experiments in a regime of the spin transparency (ST) when the design global spin tune is close to zero. In this regime, the polarization control is realized by use of spin navigators (SN), which are compact special insertions of magnets dedicated to a high flexibility spin manipulation including frequent spin flips. Full article
(This article belongs to the Special Issue Advances in Spin Physics)
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Other

7 pages, 245 KiB  
Conference Report
Spin Experimentation with Unpolarized Colliding Beams at the LHC
by Sergey Troshin
Symmetry 2021, 13(10), 1886; https://doi.org/10.3390/sym13101886 - 6 Oct 2021
Cited by 1 | Viewed by 1032
Abstract
A brief recollection of the problems related to a significant hyperon polarization observed in pp-collisions is given with an emphasis on the general role of spin in the dynamics of hadron interactions. The old, unsolved problem of the observation of a [...] Read more.
A brief recollection of the problems related to a significant hyperon polarization observed in pp-collisions is given with an emphasis on the general role of spin in the dynamics of hadron interactions. The old, unsolved problem of the observation of a significant hyperon polarization can provide new insights as a result of the measurements of energies at the LHC; in combination with other measurements, these can be used to tag the QGP formation in pp-collisions with colliding beams. Polarization studies in the processes of hyperon production do not require the use of polarized beams or targets and can be performed in the existing experimental environment at the LHC. Model predictions based on the chiral dynamics and pictures of the impact parameter are presented for the illustration of a possible dynamical mechanism that leads to a hyperon polarization. Full article
(This article belongs to the Special Issue Advances in Spin Physics)
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