ITP OpenIR研究单元&专题: 理论物理所2016年知识产出
http://ir.itp.ac.cn/:80/handle/311006/21450
Thu, 18 Oct 2018 05:56:14 GMT2018-10-18T05:56:14ZTilted Axis Rotation of Mn-57 in Covariant Density Functional Theory
http://ir.itp.ac.cn/:80/handle/311006/21833
题名: Tilted Axis Rotation of Mn-57 in Covariant Density Functional Theory
作者: Peng, J; Xu, WQ; Peng, J (reprint author), Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China.
摘要: The self-consistent tilted axis cranking covariant density functional theory based on the point-coupling interaction is applied to investigate the tilted axis rotation in Mn-57. The observed data for band C are reproduced well with the assigned configuration config 1. The shears mechanism for magnetic rotation is examined by investigating microscopically the orientation of angular momentum and the corresponding contributions. It is found that config 1 and config 3 correspond to a rotation of high-K character. Config 2 corresponds to a rotation of magnetic character. However, due to the presence of electromagnetic transition (M1) and (E2), collective rotation plays an essential role in the competition with magnetic rotation.Fri, 13 Oct 2017 09:10:50 GMThttp://ir.itp.ac.cn/:80/handle/311006/218332017-10-13T09:10:50ZPure annihilation type B -> K-0*(+/-)(1430)K-(*)-/+ decays in the family non-universal Z ' model
http://ir.itp.ac.cn/:80/handle/311006/21832
题名: Pure annihilation type B -> K-0*(+/-)(1430)K-(*)-/+ decays in the family non-universal Z ' model
作者: Li, Y; Wang, DD; Lu, CD; Li, Y (reprint author), Yantai Univ, Dept Phys, Yantai 264005, Peoples R China.
摘要: By assuming that the scalar meson K-0*(1430) belongs to the first excited states or the lowest lying ground states of q (q) over bar' we study the pure annihilation-type decays B -> K-0*(+/-)(1430)K-(*)-/+ in the QCD factorization approach. Within the Standard Model, the branching fractions are of the order of 10(-8)-10(-7), which is possible to measure in the ongoing LHCb experiment or forthcoming Belle-II experiment. We also study these decays in the family non-universal Z' model. The results show that if m(z') approximate to 600 GeV (zeta = 0.02), both the branching fractions and CP asymmetries of (B) over bar (0) -> K-0*(+)(1430)K- could be changed remarkably, which provides us with a place for probing the effect of new physics. These results could be used to constrain the parameters of the Z' model.Fri, 13 Oct 2017 09:10:49 GMThttp://ir.itp.ac.cn/:80/handle/311006/218322017-10-13T09:10:49ZQuantum particle confined to a thin-layer volume: Non-uniform convergence toward the curved surface
http://ir.itp.ac.cn/:80/handle/311006/21830
题名: Quantum particle confined to a thin-layer volume: Non-uniform convergence toward the curved surface
作者: Wang, YL; Zong, HS; Zong, HS (reprint author), Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China.; Zong, HS (reprint author), Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China.; Zong, HS (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
摘要: We clearly refine the fundamental framework of the thin-layer quantization procedure, and further develop the procedure by taking the proper terms of degree one in q(3) (q(3) denotes the curvilinear coordinate variable perpendicular to curved surface) back into the surface quantum equation. The well-known geometric potential and kinetic term are modified by the surface thickness. Applying the developed formalism to a toroidal system obtains the modification for the kinetic term and the modified geometric potential including the influence of the surface thickness. (C) 2015 Elsevier Inc. All rights reserved.Fri, 13 Oct 2017 09:10:47 GMThttp://ir.itp.ac.cn/:80/handle/311006/218302017-10-13T09:10:47ZQuintessence and phantom emerging from the split-complex field and the split-quaternion field
http://ir.itp.ac.cn/:80/handle/311006/21831
题名: Quintessence and phantom emerging from the split-complex field and the split-quaternion field
作者: Gao, CJ; Chen, XL; Shen, YG; Gao, CJ (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Computat Astrophys, Beijing 100012, Peoples R China.; Gao, CJ (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
摘要: Motivated by the mathematic theory of split-complex numbers (or hyperbolic numbers, also perplex numbers) and the split-quaternion numbers (or coquaternion numbers), we define the notion of split-complex scalar field and the split-quaternion scalar field. Then we explore the cosmic evolution of these scalar fields in the background of spatially flat Friedmann-Robertson-Walker Universe. We find that both the quintessence field and the phantom field could naturally emerge in these scalar fields. Introducing the metric of field space, these theories fall into a subclass of the multi-field theories which have been extensively studied in inflationary cosmology.Fri, 13 Oct 2017 09:10:47 GMThttp://ir.itp.ac.cn/:80/handle/311006/218312017-10-13T09:10:47ZFrom strangelets to strange stars: a unified description
http://ir.itp.ac.cn/:80/handle/311006/21829
题名: From strangelets to strange stars: a unified description
作者: Xia, CJ; Peng, GX; Zhao, EG; Zhou, SG; Xia, CJ (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
摘要: The conventionally separated treatments for strangelets and strange stars are now unified with a more comprehensive theoretical description for objects ranging from strangelets to strange stars. After constraining the model parameter according to the Witten-Bodmer hypothesis and observational mass-radius probability distribution of pulsars, we investigate the properties of this kind of objects. It is found that the energy per baryon decreases monotonically with increasing baryon number and reaches its minimum at the maximum baryon number, corresponding to the most massive strange star. Due to the quark depletion, an electric potential well is formed on the surface of the quark part. For a rotational bare strange star, a magnetic field with the typical strength in pulsars is generated.Fri, 13 Oct 2017 09:10:45 GMThttp://ir.itp.ac.cn/:80/handle/311006/218292017-10-13T09:10:45ZMaster integrals for the four-loop Sudakov form factor
http://ir.itp.ac.cn/:80/handle/311006/21828
题名: Master integrals for the four-loop Sudakov form factor
作者: Boels, RH; Kniehl, BA; Yang, G; Kniehl, BA (reprint author), Univ Hamburg, Inst Theoret Phys 2, Luruper Chaussee 149, D-22761 Hamburg, Germany.
摘要: The light-like cusp anomalous dimension is a universal function in the analysis of infrared divergences. In maximally (N = 4) supersymmetric Yang Mills theory (SYM) in the planar limit, it is known, in principle, to all loop orders. The non-planar corrections are not known in any theory, with the first appearing at the four-loop order. The simplest quantity which contains this correction is the four-loop two-point form factor of the stress tensor multiplet. This form factor was largely obtained in integrand form in a previous work for N = 4 SYM, up to a free parameter. In this work, a reduction of the appearing integrals obtained by solving integration-by-parts (IBP) identities using a modified version of Reduz e is reported. The form factor is shown to be independent of the remaining parameter at integrand level due to an intricate pattern of cancellations after IBP reduction. Moreover, two of the integral topologies vanish after reduction. The appearing master integrals are cross-checked using independent algebraic-geometry techniques explored in the Mint package. The latter results provide the basis of master integrals applicable to generic form factors, including those in Quantum Chromodynamics. Discrepancies between explicitly solving the IBP relations and the MINT approach are highlighted. Remaining bottlenecks to completing the computation of the four-loop non-planar cusp anomalous dimension in N = 4 SYM and beyond are identified. (C) 2015 The Authors. Published by Elsevier B.V.Fri, 13 Oct 2017 09:10:44 GMThttp://ir.itp.ac.cn/:80/handle/311006/218282017-10-13T09:10:44ZTentative study of nuclear charge radii for neutron-deficient nuclei around the Z=82 shell from experimental a decay data
http://ir.itp.ac.cn/:80/handle/311006/21826
题名: Tentative study of nuclear charge radii for neutron-deficient nuclei around the Z=82 shell from experimental a decay data
作者: Qian, YB; Ren, ZZ; Qian, YB (reprint author), Nanjing Univ Sci & Technol, Dept Appl Phys, Nanjing 210094, Jiangsu, Peoples R China.
摘要: We tentatively investigate the root-mean-square (rms) nuclear charge radii of odd-A Po and Pb isotopes plus Tl isotopes, particularly concerning these difficultly-detected nuclei along with short lifetimes, via various data on a decay. Within the density-dependent cluster model, the density distributions of studied daughter nuclei are determined by exactly reproducing the corresponding experimental a decay half-lives, which leads the final results of nuclear charge radii. In addition, our recently proposed formula deducing the charge radii is extended to this study for comparison. Whether it concerns the ground or isomeric state of target nuclei, the extracted nuclear charge radii are found to be in good agreement with the measured values. Sequential predictions on the rms charge radii are subsequently made for these neutron-deficient nuclei and especially for the rarely detected Bi isotopic chain, which are expected to be useful for future measurements. Moreover, the variety of a-preformation factors is analyzed in the scheme of valence nucleon number to pursue the further improvement of the model. This may be considered as an effective effort to obtain the charge radii of ground and even low-lying excited states for exotic nuclei near the proton-dripline. (C) 2015 Elsevier B.V. All rights reserved.Fri, 13 Oct 2017 09:10:43 GMThttp://ir.itp.ac.cn/:80/handle/311006/218262017-10-13T09:10:43ZConstraints on interacting dark energy from time delay lenses
http://ir.itp.ac.cn/:80/handle/311006/21827
题名: Constraints on interacting dark energy from time delay lenses
作者: Pan, Y; Cao, S; Li, L; Cao, S (reprint author), Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China.
摘要: We use the time delay measurements between multiple images of lensed sources in 18 strongly gravitationally lensed (SGL) systems to put additional constraints on three phenomenological interaction models for dark energy (DE) and dark matter (DM). The compatibility among the fits on the three models seems to imply that the coupling between DE and DM is a small value close to zero, which is compatible with the previous results for constraining interacting DE parameters. We find that, among the three interacting DE models, the gamma(m) IDE model with the interaction term Q proportional to the energy density of DM provides relatively better fits to recent observations. However, the coincidence problem is still very severe in the framework of three interacting DE models, since the fitting results do not show any preference for a nonzero coupling between DE and DM. More importantly, we have studied the significance of the current strong lensing data in deriving the interacting information between dark sectors, which highlights the importance of strong lensing time delay measurements to provide additional observational fits on alternative cosmological models.Fri, 13 Oct 2017 09:10:43 GMThttp://ir.itp.ac.cn/:80/handle/311006/218272017-10-13T09:10:43ZWeak decays of heavy hadrons into dynamically generated resonances
http://ir.itp.ac.cn/:80/handle/311006/21825
题名: Weak decays of heavy hadrons into dynamically generated resonances
作者: Oset, E; Liang, WH; Bayar, M; Xie, JJ; Dai, LR; Albaladejo, M; Nielsen, M; Sekihara, T; Navarra, F; Roca, L; Mai, M; Nieves, J; Dias, JM; Feijoo, A; Magas, VK; Ramos, A; Miyahara, K; Hyodo, T; Jido, D; Doring, M; Molina, R; Chen, HX; Wang, E; Geng, LS; Ikeno, N; Fernandez-Soler, P; Sun, ZF; Oset, E (reprint author), Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China.
摘要: In this paper, we present a review of recent works on weak decay of heavy mesons and baryons with two mesons, or a meson and a baryon, interacting strongly in the final state. The aim is to learn about the interaction of hadrons and how some particular resonances are produced in the reactions. It is shown that these reactions have peculiar features and act as filters for some quantum numbers which allow to identify easily some resonances and learn about their nature. The combination of basic elements of the weak interaction with the framework of the chiral unitary approach allow for an interpretation of results of many reactions and add a novel information to different aspects of the hadron interaction and the properties of dynamically generated resonances.Fri, 13 Oct 2017 09:10:41 GMThttp://ir.itp.ac.cn/:80/handle/311006/218252017-10-13T09:10:41ZThe Xi*(K)over-bar and Omega eta Interaction Within a Chiral Unitary Approach
http://ir.itp.ac.cn/:80/handle/311006/21823
题名: The Xi*(K)over-bar and Omega eta Interaction Within a Chiral Unitary Approach
作者: Xu, SQ; Xie, JJ; Chen, XR; Jia, DJ; Xie, JJ (reprint author), Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China.
摘要: In this work we study the interaction of the coupled channels Omega eta and Xi*(K) over bar within the chiral unitary approach. The systems under consideration have total isospins 0, strangeness S = -3, and spin 3/2. We study the s wave interaction which implies that the possible resonances generated in the system can have spin-parity JP = 3/2. The unitary amplitudes in coupled channels develop poles that can be associated with some known baryonic resonances. We find there is a dynamically generated 3/2(-) Omega state with mass around 1800 MeV, which is in agreement with the predictions of the five-quark model.Fri, 13 Oct 2017 09:10:40 GMThttp://ir.itp.ac.cn/:80/handle/311006/218232017-10-13T09:10:40Z