Article
Astronomy & Astrophysics
Dongyan Fu, Bao-Dong Sun, Yubing Dong
Summary: The numerical study of the generalized parton distributions (GPDs) for the spin-3/2 A+ resonance is conducted using a diquark spectator approach. The results confirm the satisfaction of symmetric constraints from time reversal on GPDs. The axial-vector form factors and the structure functions are also analyzed and compared with lattice QCD calculations. The scale evolution of the structure functions up to 4 GeV are predicted for potential lattice QCD calculations.
Article
Astronomy & Astrophysics
Juan Guerrero, Alberto Accardi
Summary: We revisit the derivation of collinear factorization for Deep Inelastic Scattering and introduce an inclusive jet function to describe the scattered quark final state. This allows us to restrict the parton kinematic approximations to the four-momentum conservation of the hard scattering process and use scaling variables that better represent the partonic kinematics. We verify the validity of the obtained factorization formula using a diquark spectator model and discuss the limitations of this approach.
Article
Astronomy & Astrophysics
Chentao Tan, Zhun Lu
Summary: In this study, we calculate the quasi-distributions of the leading-twist T-odd quarks in a spectator model with scalar and axial-vector diquarks. We find that these quasi-distributions are fair approximations to the standard distributions under certain conditions.
Article
Astronomy & Astrophysics
Dipankar Chakrabarti, Raj Kishore, Asmita Mukherjee, Sangem Rajesh
Summary: In this study, we calculate the azimuthal asymmetries in back-to-back production of J/psi and a photon in electron-proton scattering process at the future electron-ion collider using the transverse momentum dependent parton distribution (TMD) factorization framework. We consider both unpolarized and transversely polarized proton cases. The formation of J/psi is described using nonrelativistic QCD, and we find that the cross section is contributed by only one color octet state. This results in azimuthal modulations that are independent of long-distance matrix elements, making them suitable for probing the dominant gluon TMDs in this kinematics. We provide estimates of the upper bounds of different azimuthal asymmetries using positivity bounds on TMDs, as well as an estimate of the asymmetries using the Gaussian parametrization of the TMDs.
Article
Astronomy & Astrophysics
Kai Watanabe
Summary: This study proposes a new application of lattice QCD to calculate the quark-diquark potential, diquark mass, and quark mass. The HAL QCD method is used to calculate the charm-diquark potential and suggests that the weakening of the attraction may be attributed to the diquark size effect.
Article
Astronomy & Astrophysics
Ding Yu Shao, Cheng Zhang, Jian Zhou, Ya-jin Zhou
Summary: In this paper, we investigate the azimuthal asymmetries of muon pair production in ultraperipheral heavy-ion collisions using the joint impact parameter and transverse momentum-dependent framework. By resumming the final state QED radiation effects to all orders in perturbation theory and taking into account the complete muon mass corrections, we provide numerical estimations for the asymmetries in different kinematic regions accessible at RHIC and LHC. We find that the lepton mass effects can significantly modify the asymmetries at relatively large pair transverse momentum at RHIC energy.
Article
Astronomy & Astrophysics
Pan-Pan Shi, Fei Huang, Wen-Ling Wang
Summary: The study investigates the mass spectrum of hidden charm tetraquark states within a diquark model and systematically calculates the masses of various possible tetraquark states. The results confirm the composition of several known tetraquark states and provide predictions for other possible tetraquark states.
Article
Physics, Applied
M. Reza, F. Faraji, A. Knoll
Summary: Partially magnetized low-temperature plasmas in an E x B configuration have become important in industrial applications, but the underlying physics of operation, such as plasma instabilities and electron cross field transport, are not fully understood. This study investigates the influence of three factors (magnetic field gradient, secondary electron emission, and plasma number density) on the plasma processes in a Hall thruster using particle-in-cell simulations. The findings show the development of a long-wavelength azimuthal mode with a frequency of about 1 MHz in high-density plasma cases, induced by an inverse energy cascade and resulting in significant electron cross field transport and ion heating.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Particles & Fields
Markus A. Ebert, Anjie Gao, Iain W. Stewart
Summary: Differential measurements of the semi-inclusive deep inelastic scattering process with polarized beams provide important information on the three-dimensional structure of hadrons. Theoretical predictions for the distributions in this process are currently based on the parton model, and a complete factorization formula for power suppressed hard scattering effects in SIDIS is derived using the Soft Collinear Effective Theory. The derived formula gives generalized definitions of the transverse momentum dependent distributions and shows that only the same leading power soft function appears at this order.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Nuclear
Pan-Pan Shi, Fei Huang, Wen-Ling Wang
Summary: The mass spectrum of hidden charm pentaquark states is calculated using an effective Hamiltonian with interactions dependent on spin, color, and flavor. The results explain certain states and predict the masses of others, while also discussing potential decay channels.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Astronomy & Astrophysics
Andreas Crivellin, Matthew Kirk
Summary: The discrepancies between b -> sl(+) l(-) data and the corresponding Standard Model predictions suggest the existence of new physics with a new Wilson coefficient. The chiral nature of heavy new physics and the constraints from lepton flavor violation pose a challenge for model building.
Article
Astronomy & Astrophysics
Dongyan Fu, Bao-Dong Sun, Yubing Dong
Summary: In this work, the electromagnetic and gravitational form factors of a spin-3/2 particle, ?? resonance, are simultaneously calculated using a relativistic covariant quark-diquark approach. The obtained form factors are in good agreement with experimental data and comparable to other methods. Additionally, the gravitational form factors giving mechanical properties of the ?? isobar are provided, along with discussions on the sign and interpretation of the D term.
Article
Astronomy & Astrophysics
Yonghee Kim, Makoto Oka, Kei Suzuki
Summary: The energy spectrum of doubly heavy tetraquarks, TQQ (QQq??q?? with Q = c, b and q = u, d, s), is investigated in the potential chiral-diquark model. The Tbb, Tcc, and Tcb tetraquarks are described as a three-body system composed of two heavy quarks and an antidiquark. Several Tbb bound states are found, and the change of TQQ tetraquark masses under restoration of chiral symmetry is also studied.
Article
Physics, Fluids & Plasmas
A. R. Bosco de Magalhaes
Summary: By employing agent-based models, researchers can gain insights into the microeconomic interactions of individuals in financial markets, which helps in understanding market behavior. The study reveals that different types of traders and their information processing abilities influence the convergence of prices and the evolution of traders' wealth.
Article
Biophysics
Martin Girard, Tristan Bereau
Summary: The plasma membrane of eukaryotes exhibits lipid asymmetry, with different lipids primarily located in different leaflets. Using computational simulations, it has been found that saturation asymmetry arises as a result of phospholipid number asymmetry and sphingomyelin contents. This suggests that some asymmetries in lipid composition may naturally result from others and do not require external factors. The asymmetry of cholesterol, on the other hand, is fairly mild and influenced by all the other asymmetries.
BIOPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Alessandro Bacchetta, Giuseppe Bozzi, Marco Radici, Mathias Ritzmann, Andrea Signori
Article
Astronomy & Astrophysics
Alessandro Bacchetta, Miguel G. Echevarria
Article
Physics, Particles & Fields
Alessandro Bacchetta, Daniel Boer, Cristian Pisano, Pieter Taels
EUROPEAN PHYSICAL JOURNAL C
(2020)
Article
Physics, Particles & Fields
Alessandro Bacchetta, Francesco Giovanni Celiberto, Marco Radici, Pieter Taels
EUROPEAN PHYSICAL JOURNAL C
(2020)
Article
Physics, Particles & Fields
Alessandro Bacchetta, Valerio Bertone, Chiara Bissolotti, Giuseppe Bozzi, Filippo Delcarro, Fulvio Piacenza, Marco Radici
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
A. Airapetian, N. Akopov, Z. Akopov, E. C. Aschenauer, W. Augustyniak, R. Avakian, A. Bacchetta, S. Belostotski, V Bryzgalov, G. P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, W. Deconinck, R. De Leo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. Dueren, G. Elbakian, F. Ellinghaus, A. Fantoni, L. Felawka, G. Gavrilov, V Gharibyan, D. Hasch, Y. Holler, A. Ivanilov, H. E. Jackson, S. Joosten, R. Kaiser, G. Karyan, E. Kinney, A. Kisselev, V Kozlov, P. Kravchenko, L. Lagamba, L. Lapikas, I Lehmann, P. Lenisa, W. Lorenzon, S. Manaenkov, B. Marianski, H. Marukyan, Y. Miyachi, A. Movsisyan, V Muccifora, Y. Naryshkin, A. Nass, G. Nazaryan, W-D Nowak, L. L. Pappalardo, P. E. Reimer, A. R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, A. Schaefer, G. Schnell, B. Seitz, T-A Shibata, V Shutov, M. Statera, A. Terkulov, M. Tytgat, Y. Van Haarlem, C. Van Hulse, D. Veretennikov, I Vilardi, S. Yaschenko, D. Zeiler, B. Zihlmann, P. Zupranski
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Review
Physics, Nuclear
A. Arbuzov, A. Bacchetta, M. Butenschoen, F. G. Celiberto, U. D'Alesio, M. Deka, I. Denisenko, M. G. Echevarria, A. Efremov, N. Ya. Ivanov, A. Guskov, A. Karpishkov, Ya. Klopot, B. A. Kniehl, A. Kotzinian, S. Kumano, J. P. Lansberg, Keh-Fei Liu, F. Murgia, M. Nefedov, B. Parsamyan, C. Pisano, M. Radici, A. Rymbekova, V. Saleev, A. Shipilova, Qin-Tao Song, O. Teryaev
Summary: The SPD is a future multipurpose experiment to study the gluon content of nucleons using various probes. It aims to investigate phenomena such as gluon helicity, Sivers functions, and Boer-Mulders functions, as well as measure single and double spin asymmetries.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2021)
Article
Physics, Particles & Fields
N. A. Abdulov, A. Bacchetta, S. Baranov, A. Bermudez Martinez, V Bertone, C. Bissolotti, V Candelise, L. I. Estevez Banos, M. Bury, P. L. S. Connor, L. Favart, F. Guzman, F. Hautmann, M. Hentschinski, H. Jung, L. Keersmaekers, A. Kotikov, A. Kusina, K. Kutak, A. Lelek, J. Lidrych, A. Lipatov, G. Lykasov, M. Malyshev, M. Mendizabal, S. Prestel, S. Sadeghi Barzani, S. Sapeta, M. Schmitz, A. Signori, G. Sorrentino, S. Taheri Monfared, A. van Hameren, A. M. van Kampen, M. Vanden Bemden, A. Vladimirov, Q. Wang, H. Yang
Summary: TMDlib2 is a common library for TMDs and uPDFs, providing a 3D picture of partonic structure. TMDplotter tool allows web-based plotting of distributions, including collinear pdfs.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Alessandro Bacchetta, Filippo Delcarro, Cristian Pisano, Marco Radici
Summary: We present the distribution of unpolarized quarks in a transversely polarized proton in three-dimensional momentum space. Our results are based on the extractions of the unpolarized and Sivers transverse momentum dependent parton distributions (TMDs) in a fully consistent TMD framework.
Article
Physics, Particles & Fields
Alessandro Bacchetta, Valerio Bertone, Chiara Bissolotti, Giuseppe Bozzi, Matteo Cerutti, Fulvio Piacenza, Marco Radici, Andrea Signori
Summary: We present an accurate description of unpolarized transverse-momentum-dependent parton distribution and fragmentation functions based on a large number of experimental data points. Using the Monte Carlo replica method and resumming large logarithms at high accuracy, we achieve a very good fit to the data.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Matteo Cerutti, Lorenzo Rossi, Simone Venturini, Alessandro Bacchetta, Valerio Bertone, Chiara Bissolotti, Marco Radici
Summary: This article investigates the pion as a fundamental entity and its differences from the nucleon, emphasizing the importance of studying its internal structure and its relation to strong interactions.
Proceedings Paper
Astronomy & Astrophysics
Simone Rodini, Barbara Pasquini, Alessandro Bacchetta
27TH INTERNATIONAL NUCLEAR PHYSICS CONFERENCE (INPC2019)
(2020)
