Showing papers in "Progress in Particle and Nuclear Physics in 2021"

TL;DR: In this article, the authors provide an update of recent progress on the collinear PDFs, and also expand the scope to encompass the generalized PDFs (GPDs) and Transverse Momentum Dependent Parton Distribution Functions (TMD PDFs).

TL;DR: A broad spectrum of such information is evaluated in this article, with a view to consolidating the facts and therefrom moving toward a coherent, unified picture of hadron structure and the role that diquark correlations might play.

TL;DR: There are two mass generating mechanisms in the standard model of particle physics (SM), one related to the Higgs boson and fairly well understood, and the other embedded in quantum chromodynamics (QCD), the SM's strong interaction piece; and although responsible for emergence of the roughly 1 GeV mass scale that characterises the proton and hence all observable matter, the source and impacts of this emergent hadronic mass remain puzzling as mentioned in this paper.

TL;DR: In this paper, the authors review the current status and recent progress of microscopic many-body approaches and phenomenological models, which are employed to construct the equation of state of neutron stars.

TL;DR: The Spin Physics Detector (SPD) is a future multipurpose experiment foreseen to run at the NICA collider, which is currently under construction at the Joint Institute for Nuclear Research (JINR, Dubna, Russia) as discussed by the authors.

TL;DR: In this article, a review on the anticipated advances from lattice QCD and how these advances will impact few-body effective theories of nuclear physics by providing critical input, such as constraints on unknown low-energy constants of the effective field theories.

TL;DR: A review of recent developments in precision mass spectrometry of radioactive isotopes (RI) and some selected related physics subjects are reviewed in this paper, where the authors focus on recent experimental challenges and findings as well as on the cutting-edge experimental technologies and mass formula theories.

TL;DR: In this paper, the present status of direct nuclear reactions and the nuclear structure aspects one can study with them are discussed and the spectroscopic information we can assess in experiments involving transfer reactions, heavy-ion-induced knockout reactions and quasifree scattering with ( p, 2 p ), ( p, p n ), and ( e, e ′ p ) reactions.

TL;DR: In this paper, the authors discuss cosmological aspects of the simplest Higgs couplings to the hidden sector, known as the Higgs portal, and focus on implications of such couplings for inflation, vacuum stability and dark matter, including both the traditional weakly interacting massive particles as well as feebly interacting scalars.

TL;DR: In this article, a review of the mutual relationship of the BSM particle physics basis of the modern cosmology and the nontrivial features of the corresponding cosmological scenario is presented.

TL;DR: In this article, the authors describe the experimental facilities and methods which make it possible to produce and measure the properties of the extreme neutron-rich nuclei, and develop the theoretical framework that predicts and explains these properties; the shell model approach with large-scale configuration interaction (mixing) SM-CI, with special emphasis in the competition between the spherical mean field and the nuclear correlations (mainly pairing and quadrupole-quadrupole).

TL;DR: Theoretical prediction shows that about 9000 nuclei could be bounded, of which the properties will be hot topics in the new nuclear physics era opened by the new third generation of radioactive nuclear beam (RNB) facilities as discussed by the authors.

TL;DR: In this article, the authors describe the basics of the most common experimental methods and discuss selected recent results on the atomic and nuclear properties of the actinides up to nobelium where pioneering experiments were performed at the GSI Helmholtzzentrum fur Schwerionenforschung in Darmstadt, Germany.

TL;DR: In this article, the authors introduce the basics of QCD, the scattering theory, and the exotic internal structure of hadrons, emphasizing the importance of the pole positions of the scattering amplitude for the characterization of hadron resonances.

TL;DR: A review of experimental studies of quasifission is presented in this paper, summarising significant insights obtained experimentally over the last 40 years, and the origins for conflicting results are discussed, to try to identify and resolve outstanding discrepancies between different investigations at different times.

TL;DR: In this article, the authors reviewed the various aspects of the extension of this approach to the case of tetraquark states, which are a category of the general class of exotic states, also called multiquark states.

TL;DR: In this article, a detailed discussion of the theoretical description of these processes and their current phenomenological status is presented, and the most precise determinations of α s from other sources are also briefly reviewed and compared with the fully-inclusive results.

TL;DR: The Advanced GAmma Tracking Array (AGATA) as mentioned in this paper has seen the realization of the first phases of its construction and exploitation, and a number of nuclear structure studies based on experiments utilizing the principle of γ-ray tracking were carried out in this decade.

TL;DR: In this article, lattice studies of the color screening in the quark-gluon plasma are discussed, and thermal dissociation of the static quarks in depth for various spatial correlation functions that are studied on the lattice, and clarify the status of their screening masses.

TL;DR: In this paper, the concept of quantum phases and phase transitions is described as well as those of critical point symmetries and quasi-dynamical symmetry, and the connections between them are explored.

TL;DR: In this article, the authors present results based on the so-called Landau and Landau-like approximations of the particle-hole interaction, and apply the formalism to the determination of possible finite-size instabilities induced by a finite-range interaction.

TL;DR: In this paper, a light-by-light scattering (LBS) reaction was studied at the CERN Large Hadron Collider (LHC), where two incoming photons interact, producing another pair of photons.

TL;DR: In this article, the authors focus on the processes involving two or three light mesons with invariant masses below the nucleon-antinucleon threshold and give a review of recent results from the DA Φ NE, BEPCII, and VEPP-2000 colliders.

TL;DR: In this article, the authors discuss the possible explanations for dark matter and the experimental observables which can eventually lead to the discovery of dark matter, and demonstrate the close interplay between the cosmological properties of the early Universe and the observables used to constrain dark matter models in the context of new physics beyond the Standard Model.

TL;DR: In this article, the authors summarize the theoretical scheme, the experimental technique, astrophysical applications and the future perspectives of such approach based on α -cluster transfer reactions, and present a review of the theoretical and experimental results.

TL;DR: The spin-charge-family theory of as discussed by the authors is a spin-connection-based theory of fermions with a simple starting action in d ≥ ( 13 + 1 ) -dimensional space.

TL;DR: In this paper, the importance of S -matrix unitarity in realistic meson spectroscopy is reviewed, both its historical development and more recent applications, and several examples of puzzling meson resonances and their understanding in a modern unitarised framework are summarised.

TL;DR: In this paper, the current status of experimental searches and theoretical studies of antikaonic four-body K N N N and K K n N clusters is presented. And the results of calculations for the binding energies and the widths obtained within these methods by employing diverse sets of nucleon-nucleon, effective K N, and antikaon-antikaon interactions are presented, discussed, and compared with the calculations using the method of hyperspherical harmonics in momentum representation.

TL;DR: In this article, the authors summarize the current status of our understanding of the structure and the characteristics of the Milky Way, and summarize the emerging picture: the galaxy is evolving through interactions with the massive satellite galaxies that stud its volume, with evidence pointing to a cataclysmic past.

TL;DR: In this paper, a review of the current understanding of virtual photon emission from QCD matter is presented, grouped into production of lepton pairs in elementary processes, production off cold nuclear matter and emission from heavy-ion collisions.