检索结果-内蒙古大学图书馆

Quasi-two-body decays B(s)→Pρ′(1450),Pρ′′(1700)→Pππ in the perturbative QCD approach

学校读者我要写书评

暂无评论

Physical Review D 2017年第3期96卷 036014-036014页

作者： Ya Li Ai-Jun Ma Wen-Fei Wang Zhen-Jun Xiao Department of Physics and Institute of Theoretical Physics Nanjing Normal University Nanjing Jiangsu 210023 People’s Republic of China Institute of Theoretical Physics Shanxi University Taiyuan Shanxi 030006 China Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing Jiangsu 210023 People’s Republic of China

In this work, we calculate the CP-averaged branching ratios and direct CP-violating asymmetries of the quasi-two-body decays B(s)→Pρ′(1450),Pρ′′(1700)→Pππ by employing the perturbative QCD (PQCD) factorization approach, where P is a light pseudoscalar meson K, π, η, and η′. The considered decay modes are studied in the quasi-two-body framework by parametrizing the two-pion distribution amplitude ΦππP. The P-wave timelike form factor Fπ in the resonant regions associated with the ρ′(1450) and ρ′′(1700) is estimated based on available experimental data. The PQCD predictions for the CP-averaged branching ratios of the decays B(s)→Pρ′(1450),Pρ′′(1700)→Pππ are in the order of 10−7−10−9. The branching ratios of the two-body decays B(s)→Pρ′(1450),Pρ′′(1700) are extracted from the corresponding quasi-two-body decay modes. The whole pattern of the squared pion form factor |Fπ|2 measured by BABAR Collaboration could also be understood based on our studies. The PQCD predictions in this work will be tested by the precise data from the LHCb and the future Belle II experiments.

关键词： Branching fraction Hadronic decays

Quasi-two-body decays B(s)→Pρ→Pππ in the perturbative QCD approach

学校读者我要写书评

暂无评论

Physical Review D 2017年第5期95卷 056008-056008页

In this work, we calculate the CP-averaged branching ratios and the direct CP-violating asymmetries of the quasi-two-body decays B(s)→P(ρ→)ππ by employing the perturbative QCD (PQCD) approach (here P stands for a light pseudoscalar meson π, K, η or η′). The vector current timelike form factor Fπ, which contains the final-state interactions between the pion pair in the resonant region associated with the P-wave states ρ(770) along with the two-pion distribution amplitudes, is employed to describe the interactions between the ρ and the pion pair under the hypothesis of the conserved vector current. We found that (a) the PQCD predictions for the branching ratios and the direct CP-violating asymmetries for most considered B(s)→P(ρ→)ππ decays agree with currently available data within errors, (b) for B(B→π0ρ0→π0(π+π−), the PQCD prediction is much smaller than the measured one, and (c) for the B+→π+(ρ0→)π+π− decay mode, there is a negative CP asymmetry (−27.5−3.7+3.0)%, which agrees with other theoretical predictions but is different in sign from those reported by the BABAR and LHCb Collaborations.

关键词： Branching fraction Hadronic decays

Stochastic model predictive control based economic dispatch for hybrid energy system including wind and energy storage devices

学校读者我要写书评

暂无评论

Stochastic model predictive control based economic dispatch ...

IEEE Symposium Series on Computational Intelligence

作者： Yan Zhang Rui Wang Tao Zhang Tianjun Liao Yajie Liu Bo Guo College of Information Systems and Management National University of Defense Technology State key Laboratory of Complex System Simulation Beijing Institute of System Engineering

ISBN: (纸本)9781479975617

In this paper, a stochastic model predictive control (SMPC) approach is proposed to schedule a hybrid energy system (HES) which composes a battery energy storage system (BESS) and a wind farm. The SMPC is used to control the charge and discharge of the BESS to minimize the operation costs and maximum the selling power revenue for the HES owner with considering wind production and electricity price forecast uncertainties. Case study is employed to assess the performance of the SMPC approach and simulation results show that this approach proposed in this paper is effective and feasible.

关键词： ENERGY systems Energy storage devices Wind SMPC Predictive control Stochastic models battery energy storage system Hetastarch Dispatching

S-wave resonance contributions to the B(0s) → ηc(2S)π+π− in the perturbative QCD factorization approach

学校读者我要写书评

暂无评论

arXiv 2017年

作者： Ma, Ai-Jun Li, Ya Wang, Wen-Fei Xiao, Zhen-Jun Department of Physics Institute of Theoretical Physics Nanjing Normal University Nanjing Jiangsu210023 China Institute of Theoretical Physics Shanxi University Taiyuan Shanxi030006 China Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing Jiangsu210023 China

By employing the perturbative QCD (PQCD) factorization approach, we study the quasi-two-body B(0s) → ηc(2S)π+π− decays, where the pion pair comes from the S-wave resonance f0(X). The Breit−Wigner formula for the f0(500) and f0(1500) resonances, and the Flatté model for the f0(980) resonance are adopted to parameterize the time-like scalar form factors in the two-pion distribution amplitudes. As a comparison, Bugg's model is also used for the wide f0(500) in this work. For decay rates, we found the following PQCD predictions: (a) B(Bs0 → ηc(2S)f0(X)[π+π−]s) = (2.67+1−1..7808 ) × 10−5 when the contributions from f0(980) and f0(1500) are all taken into account;(b) B(B0 → ηc(2S)f0(500)[π+π−]s) = (1.40+0−0..9256 ) × 10−6 in the Breit-Wigner model and (1.53+0−0..9761) × 10−6 in the Bugg's model. Copyright © 2017, The Authors. All rights reserved.

关键词： Hadrons

Quasi-two-body decays B(s) → D(ρ(1450), ρ(1700)) → Dππ in the perturbative QCD factorization approach

学校读者我要写书评

暂无评论

arXiv 2017年

By employing a framework for the quasi-two-body decays in the perturbative QCD (PQCD) factorization approach, we calculate the branching ratios of the decays B(s) → D(ρ(1450), ρ(1700)) → Dππ with D = (D(s), D¯(s)). The pion vector form factor Fπ, acquired from a BABAR Collaboration analysis of e+e− → π+π−(γ) data, is involved in the two-pion distribution amplitudes ΦIππ=1. The PQCD predictions for the branching ratios of the considered quasi-two-body decays are in the range of 10−10 ∼ 10−4. The PQCD predictions for B(B0 → D¯ 0(ρ0(1450), ρ0(1700)) → D¯ 0π+π−) agree well with the measured values as reported by LHCb if one takes still large theoretical errors into account. Unlike the traditional way of the PQCD approach, one can extract the decay rates for the two-body decays B(s) → D(ρ(1450), ρ(1700)) from the results of the corresponding quasi-two-body decays. The PQCD predictions for B(B(s) → Dρ(1450)) and B(B(s) → Dρ(770)) are similar in magnitude: an interesting relation to be tested by future experimental measurements. Copyright © 2017, The Authors. All rights reserved.

关键词： Hadrons

Phase behavior of symmetric diblock copolymers under 3D soft confinement

学校读者我要写书评

暂无评论

arXiv 2024年

作者： He, Zhijuan Huang, Jin Jiang, Kai Shi, An-Chang School of Mathematics and Computational Science Xiangtan University Hunan Key Laboratory for Computation and Simulation in Science and Engineering Key Laboratory of Intelligent Computing and Information Processing Ministry of Education 411105 China Laboratory of Mathematics and Complex Systems Ministry of Education School of Mathematical Sciences Beijing Normal University Beijing100875 China Department of Physics and Astronomy McMaster University HamiltonONL8S 4M1 Canada

The phase behavior of symmetric diblock copolymers under three-dimensional (3D) soft confinement is investigated using the self-consistent field theory. The soft confinement is realized in binary blends composed AB diblock copolymers and C homopolymers, where the copolymers self-assemble to form a droplet embedded in the homopolymer matrix. The phase behavior of the confined block copolymers is regulated by the degree of confinement and the selectivity of the homopolymers, resulting in a rich variety of novel structures. When the C homopolymers are neutral to the A- and B-blocks, stacked lamellae (SL) are formed where the number of layers increases with the droplet volume, resulting in a morphological transition sequence from Janus particle to square SL. When the C homopolymers are strongly selective to the B-blocks, a series of non-lamellar morphologies, including onion-, hamburger-, cross-, ring-, and cookie-like structures, are observed. A detailed free energy analysis reveals a first-order reversible transformation between SL and onion-like (OL) structures when the selectivity of the homopolymers is changed. Our results provide a comprehensive understanding of how various factors, such as the copolymer concentration, homopolymer chain length, degree of confinement, homopolymer selectivity, affect the self-assembled structures of diblock copolymers under soft 3D confinement. Copyright © 2024, The Authors. All rights reserved.

关键词： Free energy

Doubly-heavy tetraquarks

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Yang, Gang Ping, Jialun Segovia, Jorge Department of Physics State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua University Beijing100084 China Department of Physics Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing210023 China Departamento de Sistemas Físicos Químicos y Naturales Universidad Pablo de Olavide SevillaE-41013 Spain

In the framework of the chiral quark model along with complex scaling range, we perform a dynamical study on the low-lying S-wave doubly-heavy tetraquark states (QQq¯q¯, Q = c,b and q = u,d) with an accurate computing approach, Gaussian expansion method. The meson-meson and diquark-antidiquark configurations within all possible color structures for spin-parity quantum numbers JP = 0+, 1+ and 2+, and in the 0 and 1 isospin sectors are considered. Possible tightly bound and narrow resonance states are obtained for doubly-charm and doubly-bottom tetraquarks with IJP = 01+, and these exotic states are also obtained in charm-bottom tetraquarks with 00+ and 01+ quantum numbers. Only loosely bound state is found in charm-bottom tetraquarks of 02+ states. All of these bound states within meson-meson configurations are loosely bound whether in color-singlet channels or coupling to hidden-color ones. However compact structures are available in diquark-antidiquark channels except for charm-bottom tetraquarks in 02+ states. Copyright © 2019, The Authors. All rights reserved.

关键词： Hadrons

RETRACTED: Graphic and haptic simulation for transvaginal cholecystectomy training in NOTES

学校读者我要写书评

暂无评论

Journal of Biomedical Informatics 2016年 60卷 410-421页

作者： Jun J. Pan Woojin Ahn Saurabh Dargar Tansel Halic Bai C. Li Ganesh Sankaranarayanan Kurt Roberts Steven Schwaitzberg Suvranu De State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China Center for Modeling Simulation and Imaging in Medicine Rensselaer Polytechnic Institute Troy USA Computer Science Department University of Central Arkansas Conway USA Gastrointestinal Surgery Yale School of Medicine Yale University New Heaven USA Department of Surgery Cambridge Health Alliance Harvard Medical School Boston USA

This article has been retracted: please see Elsevier Policy on Article Withdrawal ( http://***/locate/withdrawalpolicy ). This article has been retracted at the request of the Editor-in-Chief. The Publisher and Editor have been informed that the article was submitted to the journal without the consent of all the coauthors. The coauthor Suvranu De expressed concerns regarding the validity of some of the techniques and data reported in the paper, particularly in Figure 18 and Table 3. In addition, we identified in the article a significant portion of copied text that came from the following publications: Metaballs-based physical modeling and deformation of organs for virtual surgery Junjun Pan, Chengkai Zhao, Xin Zhao, Aimin Hao, Hong Qin The Visual Computer , June 2015, Volume 31, Issue 6, pp 947–957 DOI: 10.1007/s00371-015-1106-y Virtual reality training and assessment in laparoscopic rectum surgery Jun J. Pan, Jian Chang, Xiaosong Yang, Hui Liang, Jian J. Zhang, Tahseen Qureshi, Robert Howell and Tamas Hickish The International Journal of Medical Robotics and Computer Assisted Surgery , Volume 11, Issue 2, pages 194–209 DOI: 10.1002/rcs.1582 As such, this article represents an abuse of the scientific publishing system, which we believe warrants the retraction of the article. The scientific community takes a very strong view on this matter and apologies are offered to the readers of the journal that our processes, which have since been updated, did not adequately verify the assent of the coauthors and their approval of the paper’s content.

关键词：

Doubly Charmed Pentaquarks

学校读者我要写书评

暂无评论

arXiv 2020年

The LHCb Collaboration, using its full data set from runs 1 and 2, announced in 2019 a surprising update of the hidden-charm pentaquark states Pc(4380)+ and Pc(4450)+, observed in 2015. A new state, Pc(4312)+, was clearly seen at lower energies;furthermore, the original Pc(4450) resonance was resolved into two individual states, named the Pc(4440)+ and the Pc(4457)+. Motivated by the fact that these new hidden-charm pentaquark states were successfully predicted by our chiral quark model, we extend herein such study to the doubly charmed sector. The analyzed total spin and parity quantum numbers are JP = 21 − , 32− and 25 −, in the I = 12 and 23 isospin channels. We find several possible narrow baryon-meson resonances (theoretical masses in parenthesis): IJP = 1212− ΣcD(4356), 12 23 − Σ∗cD(4449), 3212− ΣcD(4431), 3212− ΣcD(4446), 3232− ΣcD∗(4514) and 23 52− Ξ∗ccρ(4461) whose widths are 4.8, 8.0, 2.6, 2.2, 4.0 and 3.0 MeV, respectively. Moreover, one shallow bound-state is found, too, with quantum numbers IJP = 21 32− Ξ∗ccπ(3757). These doubly charmed pentaquark states are expected to be identified in future experiments. Copyright © 2020, The Authors. All rights reserved.

关键词： Hadrons