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Invariant-mass distribution of top-quark pairs and top-quark mass determination

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Chinese physics C 2020年第9期44卷 1-6页

作者： Wan-Li Ju Guoxing Wang Xing Wang Xiaofeng Xu Yongqi Xu Li Lin Yang School of physics and State Key Laboratory of Nuclear physics and Technology Peking UniversityBeijing 100871China institute for Particle physics Phenomenology Durham UniversityDurham DH13LEUK prisma+cluster of excellence&mainz institute for theoretical physics Johannes Gutenberg University55099 MainzGermany Institut für Theoretische Physik Universität BernSidlerstrasse 5CH-3012 BernSwitzerland Zhejiang institute of Modern physics Department of PhysicsZhejiang UniversityHangzhou 310027China

In this study,we investigate the invariant-mass distribution of top-quark pairs near the 2mt threshold,which strongly influences the determination of the top-quark mass ***-order non-relativistic corrections lead to large contributions,which are not included in the state-of-the-art theoretical predictions.A factorization formula is derived to resum such corrections to all orders in the strong-coupling,and necessary ingredients are calculated to perform the resummation at next-to-leading *** combine the resummation with fixed-order results and present phenomenologically relevant numerical *** resummation effect significantly increases the differential cross-section in the threshold region and makes the theoretical prediction more compatible with experimental *** estimate that using our prediction in the determination of mt will lead to a value closer to the direct measurement result.

关键词： top quark QCD resummation

Probing top-quark couplings indirectly at Higgs factories

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Chinese physics C 2018年第12期42卷 53-65页

作者： Gauthier Durieux Jiayin Gu Eleni Vryonidou Cen Zhang DESY Notkestratle 85 D-22607HamburgGermany prisma cluster of excellence Institut ffir PhysikJohannes Gutenberg-Universitgt55099 MainzGermany theoretical physics Department CERN1211 Geneva 23Switzerland institute of High Energy physics and School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China

We perform a global effective-field-theory analysis to assess the combined precision of Higgs couplings, triple gauge-boson couplings, and top-quark couplings, at future circular e＋e- colliders, with a focus on runs below the tt-production threshold. Deviations in the top-quark sector entering as one-loop corrections are consistently taken into account in the Higgs and diboson processes. We find that future lepton colliders running at center-of-mass energies below the tt production threshold can still provide useful information on top-quark couplings, by measuring virtual top-quark effects. With rate and differential measurements, the indirect individual sensitivity achievable is better than at the high-luminosity LHC. However, strong correlations between the extracted top-quark and Higgs couplings are also present and lead to much weaker global constraints on top-quark couplings. This implies that a direct probe of top-quark couplings above the t~ production threshold is also helpful for the determination of Higgs and triple-gauge-boson couplings. In addition, we find that below the e＋e- -＋tth production threshold, the top-quark Yukawa coupling can be determined by its loop corrections to all Higgs production and decay channels. Degeneracy with the ggh coupling can be resolved, and even a global limit is competitive with the prospects of a linear collider above the threshold. This provides an additional means of determining the top-quark Yukawa coupling indirectly at lepton colliders.

关键词： effective field theory top quark lepton collider

Exclusive semileptonic decays of D and Ds mesons in the covariant confining quark model

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Frontiers of physics 2019年第6期14卷 103-132页

作者： M.A.Ivanov J.G.Korner J.N.Pandya P.Santorelli N.R.Soni C.T.Tran Bogoliubov Laboratory of theoretical physics Joint Institute for Nuclear Research141980 DubnaRussia prisma cluster of excellence Institut für PhysikJohannes Gutenberg-UniversitatD-55099 MainzGermany Applied physics Department Faculty of Technology and EngineeringThe Maharaja Sayajirao University of BarodaVadodara 390001GujaratIndia Dipartimento di Fisica"E.Pancini" Universitàdi Napoli FedericoⅡComplesso Universitario di Monte S.AngeloVia CintiaEdificio 680126 NapoliItaly Istituto Nazionale di Fisica Nucleare Sezione di Napoli80126 NapoliItaly

Recently,the BESⅢcollaboration has reported numerous measurements of various D(s)meson semileptonic decays with significantly improved *** with similar studies carried out at BABAR,Belle,and CLEO,new windows to a better understanding of weak and strong interactions in the charm sector have been *** light of new experimental data,we review the theoretical description and predictions for the semileptonic decays of D(s)to a pseudoscalar or a vector *** review is essentially an extended discussion of our recently published results obtained in the framework of the covariant confining quark model.

关键词： covariant quark model semileptonic decay charmed meson form factor angular distribution

Precision Higgs physics at the CEPC

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Chinese physics C 2019年第4期43卷 5-44页

作者： Fenfen An Yu Bai Chunhui Chen Xin Chen Zhenxing Chen Joao Guimaraes da Costa Zhenwei Cui Yaquan Fang Chengdong Fu Jun Gao Yanyan Gao Yuanning Gao Shaofeng Ge Jiayin Gu Fangyi Guo Jun Guo Tao Han Shuang Han Hongjian He Xianke He Xiaogang He Jifeng Hu Shih-Chieh Hsu Shan Jin Maoqiang Jing Susmita Jyotishmati Ryuta Kiuchi Chia-Ming Kuo Peizhu Lai Boyang Li Congqiao Li Gang Li Haifeng Li Liang Li Shu Li Tong Li Qiang Li Hao Liang Zhijun Liang Libo Liao Bo Liu Jianbei Liu Tao Liu Zhen Liu Xinchou Lou Lianliang Ma Bruce Mellado Xin Mo Mila Pandurovic Jianming Qian Zhuoni Qian Nikolaos Rompotis Manqi Ruan Alex Schuy Lianyou Shan Jingyuan Shi Xin Shi Shufang Su Dayong Wang Jin Wang Liantao Wang Yifang Wang Yuqian Wei Yue Xu Haijun Yang Ying Yang Weiming Yao Dan Yu Kaili Zhang Zhaoru Zhang Mingrui Zhao Xianghu Zhao Ning Zhou institute of High Energy physics Department of physics and Astronomy Iowa State University Department of physics Southeast University Department of Engineering physics Physics Department Tsinghua University School of physics Peking University University of Chinese Academy of Science (UCAS) Physical Science Laboratory Huairou National Comprehensive Science Center School of physics and Astronomy Shanghai Jiao Tong University KLPPAC-MoE SKLPPC Department of physics University of Liverpool Kavli IPMU (WPI) UTIAS The University of Tokyo Department of physics University of California prisma cluster of excellence & mainz institute of theoretical physics Johannes Gutenberg-Universit?t Mainz Department of Modern physics University of Science and Technology of China Department of physics & Astronomy University of Pittsburgh Tsung-Dao Lee institute Department of physics National Taiwan University Department of physics University of Washington Department of physics Nanjing University School of Nuclear Science and Technology University of South China Department of physics University of Texas at Dallas Department of physics and Center for High Energy and High Field physics National Central University institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle physics and Particle Irradiation (MOE) Shandong University Department of physics Hong Kong University of Science and Technology theoretical physics Department Fermi National Accelerator Laboratory Maryland Center for Fundamental physics Department of Physics University of Maryland School of physics and institute for Collider Particle physics University of the Witwatersrand iThemba LABS National Research Foundation Vinca institute of Nuclear Sciences University of Belgrade Department of physics University of Michigan Center for theoretical physics of the Universe Institute of Basic Science Department of physics University of Arizona Department of physics University of Chicago Lawrence Berkeley National Laboratory Chi

The discovery of the Higgs boson with its mass around 125 GeV by the ATLAS and CMS Collaborations marked the beginning of a new era in high energy *** Higgs boson will be the subject of extensive studies of the ongoing LHC *** the same time,lepton collider based Higgs factories have been proposed as a possible next step beyond the LHC,with its main goal to precisely measure the properties of the Higgs boson and probe potential new physics associated with the Higgs *** Circular Electron Positron Collider(CEPC)is one of such proposed Higgs *** CEPC is an e^+e^- circular collider proposed by and to be hosted in *** in a tunnel of approximately 100 km in circumference,it will operate at a center-of-mass energy of 240 GeV as the Higgs *** this paper,we present the first estimates on the precision of the Higgs boson property measurements achievable at the CEPC and discuss implications of these measurements.

关键词： CEPC Higgs bos on Higgs boson properties Higgs boson couplings Higgs factory effective field theory,EFT

Electron Correlations, Spin-Orbit Coupling, and Antiferromagnetic Anisotropy in Layered Perovskite Iridates Sr_2IrO_4

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Communications in theoretical physics 2018年第7期69卷 81-88页

作者： Hao Zhou Yuan-Yuan Xu Sen Zhou CAS Key Laboratory of theoretical physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China CAS Center of excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100049China

The effects of electron correlations and spin-orbit coupling on the magnetic anisotropy in the antiferromagnetically ordered 5 d perovskite iridates Sr_2IrO_4 is investigated theoretically using a microscopic model includes a realistic five-orbital tight-binding Hamiltonian, atomic spin-orbit coupling, and multi-orbital Hubbard interactions. Hartree-Fock approximation is applied to obtain the ground state properties with varying spin-orbit coupling and electron *** demonstrate that the interplay between the atomic intraorbital Coulomb repulsion and the Hund's rule coupling leads to a remarkable variability of the resulting magnetic anisotropy at a constant nonzero spin-orbit coupling. At the same time, the preferred direction of the ordered antiferromagnetical moment remains unaltered upon changes in the strength of spin-orbit coupling.

关键词： spin-orbit coupling antiferromagnetic anisotropy multi-orbit Hubbard model

Top quark pair production at complete NLO accuracy with NNLO+NNLL′corrections in QCD

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Chinese physics C 2020年第8期44卷 40-45页

作者： MichałCzakon Andrea Ferroglia Alexander Mitov Davide Pagani Andrew S.Papanastasiou Benjamin D.Pecjak Darren J.Scott Ioannis Tsinikos Xing Wang Li Lin Yang Marco Zaro Institut für Theoretische Teilchenphysik und Kosmologie RWTH Aachen UniversityD-52056 AachenGermany New York City College of Technology BrooklynNY 11201USA The Graduate School and University Center The City University of New YorkNew YorkNY 10016 USA Cavendish Laboratory University of CambridgeCB30HE CambridgeUK Technische Universität München James-Franck-Str.1D-85748 GarchingGermany Theory Group Deutsches Elektronen-Synchrotron(DESY)D-22607 HamburgGermany institute for Particle physics Phenomenology University of DurhamDH13LE DurhamUK institute for theoretical physics University of AmsterdamScience Park 9041098 XH AmsterdamThe Netherlands Nikhef Theory GroupScience Park 1051098 XGAmsterdamThe Netherlands theoretical Particle physics Department of Astronomy and Theoretical PhysicsLund UniversitySölvegatan 14ASE-22362 LundSweden prisma+cluster of excellence Johannes Gutenberg UniversityD-55128 MainzGermany Zhejiang institute of Modern physics Department of PhysicsZhejiang UniversityHangzhou 310027China INFN Sezione di MilanoVia Celoria 1620133 MilanoItaly

We describe predictions for top quark pair differential distributions at hadron colliders,by combining the next-to-next-to-leading order quantum chromodynamics calculations and next-to-leading order electroweak corrections with double resummation at the next-to-next-to-leading logarithmic accuracy of threshold logarithms and small-mass *** the best of our knowledge,this is the first study to present such a combination,which incorporates all known perturbative *** results are presented for the invariant-mass distribution,transverse-momentum distribution,and rapidity distributions.

关键词： top quark production QCD electroweak

Odd Systems in Deformed Relativistic Hartree Bogoliubov Theory in Continuum

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Chinese physics Letters 2012年第4期29卷 43-46页

作者： LI Lu-Lu MENG Jie P.Ring ZHAO En-Guang ZHOU Shan-Gui State Key Laboratory of Nuclear physics and Technology School of PhysicsPeking UniversityBeijing 100871 School of physics and Nuclear Energy Engineering Beihang UniversityBeijing 100191 State Key Laboratory of theoretical physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190 Department of physics University of StellenboschStellenboschSouth Africa Physikdepartment Technische Universität München85748 GarchingGermany Center of theoretical Nuclear physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000

In order to describe the exotic nuclear structure in unstable odd-A or odd-odd nuclei,the deformed relativistic Hartree Bogoliubov theory in continuum is extended to incorporate the blocking effect due to the odd *** a microscopic and self-consistent description of pairing correlations,continuum,deformation,blocking effects,and the extended spatial density distribution in exotic nuclei,the deformed relativistic Hartree Bogoliubov equations are solved in a Woods Saxon basis in which the radial wave functions have a proper asymptotic behavior at large *** formalism and numerical details are *** code is checked by comparing the results with those of spherical relativistic continuum Hartree Bogoliubov theory in the nucleus *** prolate deformed nucleus 15 C is studied by examining the neutron levels and density distributions.

关键词： Hartree deformed relativistic

Three-Dimensional Angular Momentum Projected Relativistic Point-Coupling Approach for Low-Lying Excited States in ^24Mg

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Chinese physics Letters 2008年第10期25卷 3609-3612页

作者：尧江明孟杰 D. Pena Arteaga P. Ring School of physics and State Key Laboratory of Nuclear physics and Technology Peking University Beijing 100871 Physik-Department der Technischen Universitat Munchen D-85748 Garching Germany institute of theoretical physics Chinese Academy of Sciences Beijing 100190 Center of theoretical Nuclear physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000

A tull three-dimensional angular momentum projection on top ot a triaxial relativistic mean-fieid calculation is implemented for the first time. The underlying Lagrangian is a point coupling model and pairing correlations are taken into account by a monopole force. This method is applied for the low-lying excited states in ^24Mg. Good agreement with the experimental data is found for the ground state properties. A minimum in the potential energy surface for the 22^＋ state, with β≈ 0.55,7 γ≈ 10^o, is used as the basis to investigate the rotational energy spectrum as well as the corresponding B（E2） transition probabilities as compared to the available data.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Measuring Loschmidt echo via Floquet engineering in superconducting circuits

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Chinese physics B 2022年第3期31卷 117-121页

作者： Shou-Kuan Zhao Zi-Yong Ge Zhong-Cheng Xiang Guang-Ming Xue Hai-Sheng Yan Zi-Ting Wang Zhan Wang Hui-Kai Xu Fei-Fan Su Zhao-Hua Yang He Zhang Yu-Ran Zhang Xue-Yi Guo Kai Xu Ye Tian Hai-Feng Yu Dong-Ning Zheng Heng Fan Shi-Ping Zhao Beijing National Laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum Information Sciences Beijing 100193China theoretical Quantum physics Laboratory RIKEN Cluster for Pioneering ResearchWako-shiSaitama 351-0198Japan CAS Center for excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

The Loschmidt echo is a useful diagnostic for the perfection of quantum time-reversal process and the sensitivity of quantum evolution to small perturbations. The main challenge for measuring the Loschmidt echo is the time reversal of a quantum evolution. In this work, we demonstrate the measurement of the Loschmidt echo in a superconducting 10-qubit system using Floquet engineering and discuss the imperfection of an initial Bell-state recovery arising from the next-nearestneighbor(NNN) coupling present in the qubit device. Our results show that the Loschmidt echo is very sensitive to small perturbations during quantum-state evolution, in contrast to the quantities like qubit population that is often considered in the time-reversal experiment. These properties may be employed for the investigation of multiqubit system concerning many-body decoherence and entanglement, etc., especially when devices with reduced or vanishing NNN coupling are used.

关键词： superconducting qubit quantum simulation Loschmidt echo Floquet engineering