Article
Astronomy & Astrophysics
T. M. Aliev, S. Bilmis, M. Savci
Summary: In this study, we analyzed weak decays induced by J(P) = 1/2(+) -> 3/2(-) transitions and investigated the decay processes of bottom baryons. The form factors for the transitions were obtained and used to calculate the decay widths. Our findings were found to be consistent with experimental measurements and were compared with predictions from other approaches.
Article
Astronomy & Astrophysics
Myeong-Hwan Mun, Seonghyun Kim, Myung-Ki Cheoun, W. Y. So, Soonchul Choi, Eunja Ha
Summary: This study examined the shape staggering of charge radii in Hg isotopes and found that it is caused by a transition in nuclear shape. The analysis revealed that prolate shapes have larger charge radii compared to oblate shapes. The researchers explained the phenomenon in terms of the evolution of occupation probabilities of specific states.
Article
Astronomy & Astrophysics
Masamune Oguri, Volodymyr Takhistov, Kazunori Kohri
Summary: Stellar-mass primordial black holes (PBHs) can contribute to gravitational wave (GW) events and can be detected through the gravitational lensing effect. This provides a new way to explore dark matter (DM) models and test their validity.
Article
Astronomy & Astrophysics
Balazs Korodi, Daniel Kincses, Mate Csanad
Summary: This study presents the investigation of the two-particle source function in lead-lead collisions simulated by the EPOS model. The results show that a Levy source shape, deviating significantly from a Gaussian shape, is observed for pions, kaons, and protons in individual events. The source parameters extracted are found to be related to the collision centrality and pair average transverse mass. Furthermore, the effects of decay products on the Levy exponent are studied, showing a decrease when including decay products, and no mT-scaling is found across different particle species.
Article
Astronomy & Astrophysics
T. J. Gray, A. E. Stuchbery, J. Dobaczewski, A. Blazhev, H. A. Alshammari, L. J. Bignell, J. Bonnard, B. J. Coombes, J. T. H. Dowie, M. S. M. Gerathy, T. Kibedi, G. J. Lane, B. P. Mccormick, A. J. Mitchell, C. Nicholls, J. G. Pope, P. -g. Reinhard, N. J. Spinks, Y. Zhong
Summary: The g factors of 11/2(-) isomers in semimagic Sn-109 and Sn-111 were measured and found to be significantly lower than those of heavier isotopes, indicating a deviation from the theoretical expectation.
Article
Astronomy & Astrophysics
Natsumi Ikeno, Genaro Toledo, Eulogio Oset
Summary: This study uses the correlation function method to investigate the interaction between coupled channels. By analyzing synthetic data, we successfully determine the interaction of the (DK+)-K-0, (D+K0), and D-s(+)eta channels as well as the existence of a bound state. The study also evaluates the scattering characteristics of the three channels and the coupling of the bound state to its components.
Article
Astronomy & Astrophysics
Martin Bojowald, Erick I. Duque
Summary: A new class of modified gravity theories, based on the canonical formulation of general covariance, naturally exhibits MOND-like behavior without introducing new fields. This relationship with quantum gravity features suggests a fundamental origin of MOND and a possible solution to the dark-matter problem.
Article
Astronomy & Astrophysics
Clelia Altomonte, Alan J. Barr
Summary: This paper analyzes the mathematical details of applying quantum information theory to scattering amplitudes associated with Standard Model processes, focusing on the theoretical principle of the Choi-Jamiolkowski isomorphism or state-channel duality.
Article
Astronomy & Astrophysics
M. Bashkanov, D. P. Watts, S. J. D. Kay, S. Abt, P. Achenbach, P. Adlarson, F. Afzal, Z. Ahmed, C. S. Akondi, J. R. M. Annand, R. Beck, M. Biroth, N. Borisov, A. Braghieri, W. J. Briscoe, F. Cividini, C. Collicott, S. Costanza, A. Denig, E. J. Downie, P. Drexler, S. Fegan, A. Fix, S. Gardner, D. Ghosal, D. I. Glazier, I. Gorodnov, W. Gradl, D. Gurevich, L. Heijkenskjoeld, D. Hornidge, G. M. Huber, V. L. Kashevarov, M. Korolija, B. Krusche, A. Lazarev, K. Livingston, S. Lutterer, I. J. D. MacGregor, D. M. Manley, P. P. Martel, R. Miskimen, E. Mornacchi, C. Mullen, A. Neganov, A. Neiser, M. Ostrick, P. B. Otte, D. Paudyal, P. Pedroni, T. Rostomyan, V. Sokhoyan, K. Spieker, O. Steffen, I. I. Strakovsky, T. Strub, I. Supek, A. Thiel, M. Thiel, A. Thomas, Yu. A. Usov, S. Wagner, N. K. Walford, J. Wettig, M. Wolfes, R. L. Workman, N. Zachariou
Summary: We present the first measurement of the double-polarisation observable, C-x', in pi(+) photoproduction off the proton. The experiment provides new constraints on models aiming to understand the spectrum and properties of nucleon resonances. The inclusion of the new data in the analysis database has improved the description of various single and double polarisation observables in charged pion photoproduction.
Article
Astronomy & Astrophysics
Bolang Lin, Sreeraj Nair, Siqi Xu, Zhi Hu, Chandan Mondal, Xingbo Zhao, James P. Vary
Summary: In this study, the authors solve for the gluon generalized parton distributions (GPDs) inside the proton using light-front wavefunctions (LFWFs) and explore the properties of the gluon, such as its transverse size dependence and contribution to the total angular momentum of the proton.
Article
Astronomy & Astrophysics
J. W. Zhao, B. -H. Sun, I. Tanihata, S. Terashima, A. Prochazka, J. Y. Xu, L. H. Zhu, J. Meng, J. Su, K. Y. Zhang, L. S. Geng, L. C. He, C. Y. Liu, G. S. Li, C. G. Lu, W. J. Lin, W. P. Lin, Z. Liu, P. P. Ren, Z. Y. Sun, F. Wang, J. Wang, M. Wang, S. T. Wang, X. L. Wei, X. D. Xu, J. C. Zhang, M. X. Zhang, X. H. Zhang
Summary: The charge-changing cross sections (CCCS) of C11-15, N13-17, and O-15,O-17-18 on a carbon target at around 300 MeV/nucleon are presented, extending to p-shell isotopes with N<28.
Article
Astronomy & Astrophysics
Yu Cheng, Shao-Feng Ge, Xiao-Gang He, Jie Sheng
Summary: The possibility of reactivating the forbidden annihilation channel of dark matter around supermassive black holes has been discovered, providing a unique signal that can serve as evidence for its existence. Fermi-LAT data around Sgr ★ provides preliminary support for this theory.
Letter
Astronomy & Astrophysics
Ernest Ma
Summary: The study suggests that dark matter could be a type of light fermion which interacts with the W particle, similar to neutrinos. It also proposes the existence of a spontaneously broken dark U(1) gauge symmetry, resulting in the production of long-lived light dark matter.
Letter
Astronomy & Astrophysics
Ashutosh Kumar Alok, Neetu Raj Singh Chundawat, Arindam Mandal
Summary: In this study, we investigate the potential of lepton flavor ratios to probe lepton flavor universality violation in the tau-mu sector. Our findings show that these ratios can deviate from their Standard Model values even when the new physics couplings are universal. Therefore, in order to detect lepton flavor universality violation, it is necessary to compare the range of these ratios for solutions with only universal couplings and solutions with both universal and non-universal components.
Article
Astronomy & Astrophysics
H. Barzegar, B. Eslam Panah, G. H. Bordbar, M. Bigdeli
Summary: This paper investigates a new model of (2 + 1)-dimensional gravitational vacuum stars with an isotropic matter distribution anti-de Sitter spacetime in the context of massive gravity. By exploring free singularity models with a specific equation of state and using Mazur-Mottola's approach, the paper predicts 3D gravastars as alternatives to BTZ black holes in massive gravity. Analytical solutions to the interior of gravastars that are free of singularities and event horizons are found. The length, energy, and entropy of a thin shell containing an ultra-relativistic stiff fluid are discussed. The parameter of massive gravity plays a significant role in predicting the proper length, energy contents, entropy, and parameters of gravastars.
Article
Astronomy & Astrophysics
Roy T. Forestano, Konstantin T. Matchev, Katia Matcheva, Alexander Roman, Eyup B. Unlu, Sarunas Verner
Summary: This letter introduces two improved algorithms that significantly speed up the discovery of continuous symmetry transformations that preserve the data labels. The new methods are validated by deriving the complete set of generators for specific examples, demonstrating the general applicability of this machine-learning method for discovering symmetries in labeled datasets.
Article
Astronomy & Astrophysics
Angelo Esposito, Davide Germani, Alfredo Glioti, Antonio D. Polosa, Riccardo Rattazzi, Michele Tarquini
Summary: Using the distorted wave Born approximation in non-relativistic quantum mechanics, we determine the contribution of long-range pion interactions to the dynamics of X(3872) and propose that it is a loosely bound D-0(D) over bar*(0) molecule. Despite the long-range nature of pion interactions, they do not produce a significant and negative effective range, but they introduce imaginary parts. Furthermore, they contribute to the total decay width of X(3872) with a term associated with, but not precisely corresponding to, the D* width. Our approach can also be applied to the recently discovered T-cc(+) state.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Luiz F. Ferreira, Octavio C. Junqueira
Summary: This work investigates the behavior of configuration entropy (CE) in a rotating plasma using a holographic description. The study shows that the CE increases with rotational speed and diverges as the speed approaches the speed of light.
Article
Astronomy & Astrophysics
K. Wimmer, P. Ruotsalainen, S. M. Lenzi, A. Poves, T. Huyuk, F. Browne, P. Doornenbal, T. Koiwai, T. Arici, K. Auranen, M. A. Bentley, M. L. Cortes, C. Delafosse, T. Eronen, Z. Ge, T. Grahn, P. T. Greenlees, A. Illana, N. Imai, H. Joukainen, R. Julin, A. Jungclaus, H. Jutila, A. Kankainen, N. Kitamura, B. Longfellow, J. Louko, R. Lozeva, M. Luoma, B. Mauss, D. R. Napoli, M. Niikura, J. Ojala, J. Pakarinen, X. Pereira-Lopez, P. Rahkila, F. Recchia, M. Sandzelius, J. Saren, R. Taniuchi, H. Tann, S. Uthayakumaar, J. Uusitalo, V. Vaquero, R. Wadsworth, G. Zimba, R. Yajzey
Summary: Excited states in Ga-62 and Ge-62 nuclei with Tz = 0, -1 were studied using direct reactions and fusion-evaporation reactions. New excited states were discovered and compared with theoretical predictions. In addition, the relationship between mirror and triplet energy differences was analyzed.
Correction
Astronomy & Astrophysics
P. G. Ortega, J. Segovia, D. R. Entem, F. Fernandez
