Showing papers on "Mass formula published in 2023"
20 Mar 2023
TL;DR: In this article , the authors employed the ab initio valence-space in-medium similarity renormalization group approach, in which charge-symmetry and charge-independence breakings are included in the adopted nuclear force.
Abstract: Isospin-symmetry breaking is responsible for the energy difference of excited states in mirror nuclei. It also influences the coefficient of the isobaric multiplet mass equation. In the present work, we extensively investigate isospin-symmetry breaking in medium mass nuclei within ab initio frameworks. For this, we employ the ab initio valence-space in-medium similarity renormalization group approach, in which charge-symmetry and charge-independence breakings are included in the adopted nuclear force. The mirror energies of sd- and pf- shell nuclei are computed for that matter. The effects of single-particle states on weakly bound and unbound nuclear states, especially those of the s-wave, are discussed. Predictions are also made concerning proton drip-line nuclei bearing large mirror energy difference. Finally, the coefficient of the isobaric multiplet mass equation in T = 1/2 and T = 1 isospin multiplets for A = 18 to A = 76 is calculated.
01 Mar 2023
TL;DR: In this article , the authors use the counterterms subtraction method to study the thermodynamics of charged rotating black holes in five-dimensional minimal gauged supergravity, and show that the mass and volume calculated via the counter terms method satisfies the first law of black hole thermodynamics.
Abstract: We use the counterterms subtraction method to study the thermodynamics of charged rotating black holes in five-dimensional minimal gauged supergravity [1]. Specifically, we analyze certain issues related to the first law and Smarr's relation in the presence of a conformal anomaly. Among the bulk quantities calculated are the on-shell action, total mass, and angular momenta of the solution. All these quantities are consistent with previous calculations made using other methods. For the boundary theory, we calculate the renormalized stress tensor, conformal anomaly, and Casimir energy. Using the Papadimitriou-Skenderis analysis [2], we show that the mass calculated via the counterterms method satisfies the first law of black hole thermodynamics. To discuss extended thermodynamics, we extend the definition of the thermodynamic volume to cases with conformal anomalies using a procedure similar to that of Papadimitriou-Skenderis. We show that this volume correctly accounts for extra terms due to boundary metric variation. This shows that the mass and volume calculated using counterterms satisfy Smarr's relation as well as the first law.
TL;DR: In this paper , a mass formula for the calculation of the baryon and meson masses is introduced and explained, which involves calculating the number of possible Feynman diagrams and multiplying it by an elementary mass quantum.
Abstract: Summing up all Feynman diagrams describing an elementary particle can provide a measure of the energy and, with it, the mass of that particle. Moreover, a single mass quantum can be used to convert the Feynman sum into the particle mass. In the following, a mass formula
for the calculation of the baryon and meson masses is introduced and explained. This formula involves calculating the number of possible Feynman diagrams and multiplying it by an elementary mass quantum. The mass formula results from a generalization of the connection between the electromagnetic
coupling constant alpha (Sommerfelds constant) and the Rydberg constant. This mass formula adds an energy parametrization to the standard model, an important component that has been missing to date. Afterward, this mass formula is interpreted, leading to an interpretation of
the elementary particles that is similar to the way in which molecules are interpreted. In this interpretation, gluons take the place of electrons in the case of elementary particles.
TL;DR: In this paper , the authors employed the ab initio valence-space in-medium similarity renormalization group approach, in which charge-symmetry and charge-independence breakings are included in the adopted nuclear force.
Abstract: Isospin-symmetry breaking is responsible for the energy difference of excited states in mirror nuclei. It also influences the coefficient of the isobaric multiplet mass equation. In the present work, we extensively investigate isospin-symmetry breaking in medium mass nuclei within ab initio frameworks. For this, we employ the ab initio valence-space in-medium similarity renormalization group approach, in which charge-symmetry and charge-independence breakings are included in the adopted nuclear force. The mirror energies of sd- and pf- shell nuclei are computed for that matter. The effects of single-particle states on weakly bound and unbound nuclear states, especially those of the s-wave, are discussed. Predictions are also made concerning proton drip-line nuclei bearing large mirror energy difference. Finally, the coefficient of the isobaric multiplet mass equation in T = 1/2 and T = 1 isospin multiplets for A = 18 to A = 76 is calculated.
04 May 2023
TL;DR: In this paper , the SU(4) multiplets have been organized and studied in an easy and new way, and some clues about the masses and other characteristics of unknown hyperons have been obtained.
Abstract: To study symmetry and its breaking in particle physics, plays very important role in order to get useful information about the nature. The classification and arrangements of subatomic particles is also necessary to study particle physics. Particles which are building blocks of nature are quarks, gluons and leptons. Baryons and Mesons composed of quarks were arranged by Gell-Mann and Okubo in their well-known Eight-Fold way up to SU(3) symmetry. Standard model of particles is composed of these particles. Particles in SU(4) also make some beautiful patron. These make some multiplets. but all the baryons with spin JP= 3/2+ in these multiplets have not been observed till date. In this paper the SU(4) multiplets have been organized and studied in an easy and new way. As a result we obtained some clues about the masses and other characteristics of the unknown hyperons. These approximations about the characteristics of the unidentified baryons have been recorded in this article. Mass formula for the baryon SU(4) multiplets have been obtained.