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ΣcΣc interactions in chiral effective field theory

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arXiv 2022年

作者： Chen, Kan Huang, Bo-Lin Wang, Bo Zhu, Shi-Lin School of Physics Center of High Energy Physics Peking University Beijing100871 China School of Physical Science and Technology Hebei University Baoding071002 China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding071002 China

We study the interactions of the ΣcΣc system in the framework of chiral effective theory. We consider the contact, one-pion and two-pion exchange interactions and bridge the low energy constants of the ΣcΣc system to those of the Σc(∗)D¯ (∗) systems through the quark-level ansatz for the contact interaction. We explore the influence of intermediate channels in the two-pion exchange diagrams of the ΣcΣc system. We obtain a deep bound state [ΣcΣc]IJ=0=0 and a shallow bound state [ΣcΣc]IJ=1=1. As a byproduct, we further investigate the interactions of the ΛcΛc and ΛcΣc systems. © 2022, CC BY.

关键词： Hadrons

Orientation-dependent Josephson effect in spin-singlet superconductor/altermagnet/spin-triplet superconductor junctions

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Physical Review B 2024年第2期109卷 024517-024517页

作者： Qiang Cheng Qing-Feng Sun School of Science Qingdao University of Technology Qingdao Shandong 266520 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Hefei National Laboratory Hefei 230088 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

We study the Josephson effect in the spin-singlet superconductor/altermagnet/spin-triplet superconductor junctions using the Green's function method. The current-phase difference relationships in the junctions strongly depend on the orientation of altermagnet and the types of the Cooper pairs. For the orientation angle equal to odd multiples of π/4, the current-phase difference relationships are of the sin2ϕ type, which are irrespective of the pairing wave functions in superconductors. For the other orientation angles, the emergence of the lowest order current becomes possible and its form, sinϕ or cosϕ, depends on the pairing wave functions in superconductors. The ϕ0 phase and the 0−π transition can be realized in our junctions due to the appearance of the lowest order current. The selection rules for the lowest order current are presented. The symmetric relations satisfied by the current-phase difference relationships are analyzed through considering the transformations of the junctions under the mirror reflection, the time-reversal and the spin-rotation operations. Our results not only provide a method to detect the intrinsic spin-triplet superconductivity but also possess application values in the design of the field-free quantum devices.

关键词： Josephson effect Spin-singlet pairing Spin-triplet pairing

Coherent Optomechanical Switch for Motion Transduction Based on Dynamically Localized Mechanical Modes

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Physical Review Applied 2018年第5期9卷 054024-054024页

作者： Hao Fu Zhi-cheng Gong Li-ping Yang Tian-hua Mao Chang-pu Sun Su Yi Yong Li Geng-yu Cao State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China Beijing Computational Science Research Center Beijing 100193 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China School of Physics & CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

We present a coherent switch for motion transduction based on dynamically localized mechanical modes in an optomechanical system consisting of two coupled cantilevers. By placing one of the cantilevers inside a harmonically oscillating optical trap, the effective coupling strength between the degenerate cantilevers can be tuned experimentally. In particular, when the coupling is turned off, we show that mechanical motion becomes tightly bounded to the isolated cantilevers rather than propagating away as a result of destructive Landau-Zener-Stückelberg–like interference. The effect of dynamical localization is adopted to implement a coherent switch, through which the tunneling oscillation is turned on and off with well-preserved phase coherence. We provide a simple yet efficient approach for full control of the coupling between mechanical resonators, which is highly desirable for coherent control of transport phenomena in a coupled-mechanical-resonator array.

关键词： Dynamical localization Optomechanics Quantum optics Coupled oscillators Micromechanical & nanomechanical oscillators Micromechanical devices Optical microcavities Coherent control

W boson mass in the NP models with extra U(1) gauge group

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arXiv 2023年

作者： Yang, Jin-Lei Ge, Zhao-Feng Yang, Xiu-Yi Cui, Sheng-Kai Feng, Tai-Fu Department of Physics Hebei University Baoding071002 China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding071002 China CAS Key Laboratory of Theoretical Physics School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China School of science University of Science and Technology Liaoning Anshan114051 China

The precise measurement of the W boson mass is closely related to the contributions of new physics (NP), which can significantly constrain the parameter space of NP models, particularly those with an additional U(1) local gauge group. The inclusion of a new Z' gauge boson and gauge couplings in these models can contribute to the oblique parameters S, T, U and the W boson mass at tree level. Taking into account the effects of kinetic mixing, in this study we calculate and analyze the oblique parameters S, T, U and the W boson mass in such NP models. It is found that the kinetic mixing effects can make significant contributions to the W boson mass, and these contributions can be eliminated by redefining the gauge boson fields through eliminating the neutral currents involving charged leptons, if the leptonic Yukawa couplings are invariant under the extra U(1) local gauge group, even with nonzero kinetic mixing effects. © 2023, CC BY.

关键词： Bosons

Exploring the lifetime frontier with a beam-dump experiment at CiADS

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arXiv 2024年

作者： Chen, Liangwen Du, Mingxuan Sun, Zhiyu Wang, Zeren Simon Xie, Fang Xie, Ju-Jun Yang, Lei Yu, Pei Zhang, Yu Heavy Ion Science and Technology Key Laboratory Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China Advanced Energy Science and Technology Guangdong Laboratory Huizhou516000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing101408 China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing100871 China Center for High Energy Physics Peking University Beijing100871 China Department of Physics National Tsing Hua University Hsinchu300 Taiwan Center for Theory and Computation National Tsing Hua University Hsinchu300 Taiwan Institute of Modern Physics Fudan University Shanghai200433 China Institute of Modern Physics Chinese Academy of Sciences Guangdong Huizhou516000 China School of Physics Hefei University of Technology Hefei230601 China

We propose a beam-dump experiment (BDE) at the upcoming facility of China initiative Accelerator Driven System (CiADS), called CiADS-BDE, in order to search for long-lived particles (LLPs) predicted in various beyond-the-Standard-Model (BSM) theories. The experiment is to be located in the forward direction of the incoming low-energy proton beam at CiADS, leveraging the strong forward boost of the produced particles at the beam dump in general. The space between the dump and the detector is largely available, allowing for installation of veto materials and hence low levels of background events. We elaborate on the detector setup, and choose dark photon as a benchmark model for sensitivity study. We restrict ourselves to the signature of an electron-positron pair, and find that with 5 years’ operation, unique, currently unexcluded parts of the parameter space for O(100) MeV dark-photon masses and O(10−9–10−8) kinetic mixing can be probed at the CiADS-BDE. Furthermore, considering that there is no need to set up a proton beam specifically for this experiment and that the detector system requires minimal instrumentation, the experiment is supposed to be relatively cost-effective. Therefore, we intend this work to promote studies on the sensitivity reach of the proposed experiment to additional LLP scenarios, and in the end, the realization of the experiment. Incidentally, we study the sensitivity of the same BDE setups at the High Intensity Heavy-ion Accelerator Facility (HIAF), presently under construction near the CiADS program site, and conclude that HIAF-BDE could probe new parameter regions, too. © 2024, CC BY.

关键词： Heavy ions

Ultra-shallow junction electrodes in low-loss silicon micro-ring resonators

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arXiv 2020年

作者： Xu, Bin-Bin de Boo, Gabriele G. Johnson, Brett C. Rančić, Miloš Bedoya, Alvaro Casas Morrison, Blair McCallum, Jeffrey C. Eggleton, Benjamin J. Sellars, Matthew J. Yin, Chunming Rogge, Sven Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of New South Wales NSW2052 Australia Centre of Excellence for Quantum Computing and Communication Technology School of Physics University of Melbourne Victoria3010 Australia Centre of Excellence for Quantum Computation and Communication Technology Research School of Physics and Engineering Australian National University ACT0200 Australia School of Physics University of Sydney NSW2006 Australia University of Sydney NSW2006 Australia CAS Key Laboratory of Microscale Magnetic Resonance Department of Modern Physics University of Science and Technology of China Hefei230026 China

Search for charged lepton flavor violation of vector mesons in the U(1)XSSM

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arXiv 2024年

作者： Dong, Xing-Xing Zhao, Shu-Min Huo, Jia-Peng Wang, Tong-Tong Wang, Yi-Tong Feng, Tai-Fu College of Physics Science & Technology Hebei University Baoding071002 China Hebei Key Laboratory of High-precision Computation and Application of Quantum Field Theory 071002 China Hebei Research Center of the Basic Discipline for Computational Physics Baoding071002 China Department of Physics Chongqing University Chongqing401331 China

Charged lepton flavor violation (CLFV) represents a clear new physics (NP) signal beyond the standard model (SM). In this work, we investigate the CLFV decays of vector mesons V → li±lj with V ∈ {φ,J/Ψ,Υ(1S),Υ(2S),Υ(3S)} in the U(1)XSSM. Considering the SM-like Higgs boson mass within 3σ region, we discuss the corresponding constraints on the relevant parameter space of the model, which indicate this model can produce significant contributions to such CLFV decays. From the numerical analyses, the main sensitive parameters and CLFV sources originate from the non-diagonal elements correspond to the initial and final generations of the leptons. And the branching ratios to these CLFV processes can easily reach the present experimental upper bounds. Therefore, searching for CLFV processes of vector mesons may be an effective channel to study new physics. © 2024, CC0.

关键词： Bosons

Octet baryon and heavy meson interactions in chiral effective field theory

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arXiv 2024年

作者： Huang, Bo-Lin Wang, Bo Zhu, Shi-Lin School of Physical Science and Technology Inner Mongolia University Hohhot010021 China Center for Quantum Physics and Technologies School of Physical Science and Technology Inner Mongolia University Hohhot010021 China College of Physics Science & Technology Hebei University Baoding071002 China Hebei Key Laboratory of High-precision Computation and Application of Quantum Field Theory Baoding071002 China Hebei Research Center of the Basic Discipline for Computational Physics Baoding071002 China School of Physics Center of High Energy Physics Peking University Beijing100871 China

We calculate the effective potentials of the octet baryon and heavy meson systems using the chiral effective field theory up to the next-to-leading order. We consider the contact terms, one-pseudoscalar-meson and two-pseudoscalar-meson exchange contributions, facilitating a comprehensive analysis of the short-, mid-, and long-range interactions in these systems. The low energy constants are correlated with those of the N¯N interaction using a quark-level Lagrangian approach. We also incorporate the decuplet baryon contributions in the loop diagrams. Our research provides new insights into several near-threshold charmed baryons [e.g., Λc(2940), Ξc(3055), and Ωc(3188), etc.] around 3 GeV from the hadronic molecular perspective. We also observe several molecular states, referred to as Ξc, within the mass range of 3100 − 3500 MeV. Further measurements of their resonance parameters and decay patterns in experiments may help to discriminate the conventional baryon and hadronic molecule explanations for these near-threshold states. Copyright © 2024, The Authors. All rights reserved.

关键词： Bosons

Chiral symmetry breaking and violation of the Wiedemann-Franz law in underdoped cuprates

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Physical Review B 2002年第10期66卷 100505(R)-100505(R)页

作者： Guo-Zhu Liu Geng Cheng Lab of Quantum Communication and Quantum Computation University of Science and Technology of China Hefei Anhui 230026 People’s Republic of China Department of Astronomy and Applied Physics University of Science and Technology of China Hefei Anhui 230026 People’s Republic of China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 People’s Republic of China

We propose that the recently observed violation of the Wiedemann-Franz law in the normal state of underdoped cuprates is caused by spin-charge separation and dynamical chiral symmetry breaking in a (2+1)-dimensional system consisting of massless Dirac fermions, charged bosons, and a gauge field. While the d-wave spinon gap vanishes at the Fermi points, the nodal fermions acquire a finite mass due to strong gauge fluctuations. This mass provides a gap below which no free fermions can be excited. This implies that there is not a residual linear term for the thermal conductivity, in good agreement with experiments. Other physical implications of the chiral symmetry breaking are also discussed.

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