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Jet modification in absence of QGP-medium:the role of multiparton interactions and color reconnection

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Chinese physics C 2024年第1期48卷 50-60页

作者： Prottoy Das Abhi Modak Debjani Banerjee Rathijit Biswas Supriya Das Sanjay KGhosh Sibaji Raha Sidharth Kumar Prasad Department of physics Bose InstituteKolkata 700091India Quark Matter Research center Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China

Recent studies on high-multiplicity events in small collision systems(proton-proton and proton-lead)have drawn considerable research interest toward the possibility of the formation of partonic medium in such *** of the important consequences of the formation of dense partonic medium is the quenching of high-momentum final-state particles,resulting in several experimental observations such as suppression in nuclear modification factor RAA,modification of jet shape observableρ(r)and jet fragmentation(z^(ch))distributions,*** this work,we studyρ(r)and z^(ch)for inclusive charged-particle jets in proton-proton(pp)collisions at√s=13 TeV using the PYTHIA 8 Monash 2013 Monte Carlo *** show that the color reconnection(CR)and multiparton interaction(MPI)mechanisms in PYTHIA 8 can lead to an increased rate of jet *** also find that the mechanisms of MPI and CR and change in the gluonic contribution in high-multiplicity events result in significant modification ofρ(r)and z^(ch)compared to those in minimum bias events for 10and gluonic contribution with the amount of modification inρ(r):the larger the number of MPIs and/or gluonic contribution,the larger the amount of modification ofρ(r).

关键词： jet modification PYTHIA multiparton interaction color reconnection gluonic contribution high-multiplicity

High-spin states of ^(125)Sb:Particle-core excitation coupling

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Science China(physics,Mechanics & Astronomy) 2003年第4期46卷 390-397页

作者：刘忠张玉虎马英君 Y.Sasaki K.Yamada H.Oshima H.Yokose M.Ishizuka T.Komatsubara K.Furuno Institute of modern physics Chinese Academy of SciencesLanzhou 730000China Institute of physics and Tandem Accelerator center University of TsukubaIbaraki 305-0006Japan

Excited states of125Sb have been studied using in-beam γ spectroscopy techniques via the124Sn(7Li, α2n) reaction at a beam energy of 32 MeV. A high-spin level scheme including 21 new γ-transitions and 14 new excited states have been established. Three isomers have been identified at 1970, 2110 and 2471 keV and the ranges of their half-lives have been estimated from the delayed coincidence data. The level structure of125Sb is discussed in terms of particle-core excitation coupling. With the help of empirical shell model calculations the three isomers are proposed to have three-quasiparticle πg7/2?v(h 11/2 s 1/2)5?, πg7/2?v(h 11/2 d 3/2)7? and πg7/2?v(h 11 2/2 )10 + configurations, respectively.

关键词： in-beam γ spectroscopy isomer particle-core coupling

Resonance enhanced electron impact excitation for P-like Cu XV

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Chinese physics B 2015年第11期24卷 217-223页

作者：李双颜君李传莹黄敏陈重阳 Applied Ion Beam physics Laboratory Fudan University Shanghai EBIT Lab Institute of Modern Physics Department of Nuclear Science and TechnologyFudan University Institute of Applied physics and Computational Mathematics center for Applied physics and Technology Peking University

Employing both the Dirac R-matrix and the relativistic distorted wave with independent process and isolated reso- nance approaches, we report resonance enhanced electron impact excitation data （specifically, effective collision strengths） among the lowest 41 levels from the n = 3 configurations of Cu XV. The results show that the latter approach can obtain resonance contributions reasonably well for most excitations of Cu XV, though a comparison between the two approaches shows that the close-coupling effects are truly significant for rather weak excitations, especially for two-electron excitations from the 3s3p4 to 3s23p23d configuration. Resonance contributions are significant （more than two orders of magnitude） for many excitations and dramatically influence the line intensity ratios associated with density diagnostics.

关键词： electron impact excitation resonance excitation collision strength Dirac R-matrix theory

One loop integrals reduction

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Chinese physics C 2012年第11期36卷 1055-1064页

作者：孙毅张浩然 Department of modern physics University of Science and Technology of China Interdisciplinary center for Theoretical Study University of Science and Technology of China Department of physics Sichuan Normal University

By further examining the symmetry of external momenta and masses in Feynman integrals, we fulfilled the method proposed by Battistel and Dallabona, and showed that recursion relations in this method can be applied to ... 详细信息

关键词： Feynman integral one loop integral reduction recursion relation

Electromagnetic fields in ultra-peripheral relativistic heavy-ion collisions

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Nuclear Science and Techniques 2024年第2期35卷 103-109页

作者： Jie Zhao Jin-Hui Chen Xu-Guang Huang Yu-Gang Ma Key Laboratory of Nuclear physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research center for Theoretical Nuclear physics NSFC and Fudan UniversityShanghai 200438China physics Department and center for Particle physics and Field Theory Fudan UniversityShanghai 200438China

Ultra-peripheral heavy-ion collisions(UPCs)offer unique opportunities to study processes under strong electromagnetic *** these collisions,highly charged fast-moving ions carry strong electromagnetic fields that can be effectively treated as photon *** exchange of photons can induce photonuclear and two-photon interactions and excite *** excitation of the ions results in Coulomb dissociation with the emission of photons,neutrons,and other ***,the electromagnetic fields generated by the ions can be sufficiently strong to enforce mutual interactions between the two colliding ***,the two colliding ions experience an electromagnetic force that pushes them in opposite directions,causing a back-to-back correlation in the emitted *** a Monte Carlo simulation,we qualitatively demonstrate that the above electromagnetic effect is large enough to be observed in UPCs,which would provide a clear means to study strong electromagnetic fields and their effects.

关键词： Electromagnetic fields Neutrons Ultra-peripheral relativistic heavy-ion collisions(UPC)

Implementation of encoder and decoder for LDPC codes based on FPGA

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Journal of Systems Engineering and Electronics 2019年第4期30卷 642-650页

作者： CHENG Kun SHEN Qi LIAO Shengkai PENG Chengzhi Department of modern physics University of Science and Technology of ChinaHefei 230026China Shanghai Branch National Laboratory for Physical Sciences at Microscale and Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences center for Excellence and Synergetic Innovation center in Quantum Information and Quantum physics University of Science and Technology of ChinaShanghai 201315China

This paper proposes a parallel cyclic shift structure of address decoder to realize a high-throughput encoding and decoding method for irregular-quasi-cyclic low-density parity-check(IR-QC-LDPC)codes,with a dual-diagonal parity structure.A normalized min-sum algorithm(NMSA)is employed for *** whole verification of the encoding and decoding algorithm is simulated with Matlab,and the code rates of 5/6 and 2/3 are selected respectively for the initial bit error ratio as 6%and 1.04%.Based on the results of simulation,multi-code rates are compatible with different basis *** the simulated algorithms of encoder and decoder are migrated and implemented on the field programmable gate array(FPGA).The 183.36 Mbps throughput of encoder and the average 27.85 Mbps decoding throughput with the initial bit error ratio 6%are realized based on FPGA.

关键词： low-density parity-check(LDPC) field programmable gate array(FPGA) normalized min-sum algorithm(NMSA).

Cellular automaton model considering headway-distance effect

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Chinese physics B 2008年第5期17卷 1863-1868页

作者：胡守信高坤汪秉宏陆玉凤 Department of modern physics and Nonlinear Science center University of Science and Technology of China Department of Science Bengbu College Shanghai Academy of System Science

This paper presents a cellular automaton model for single-lane traffic flow. On the basis of the Nagel-Schreckenberg （NS） model, it further considers the effect of headway-distance between two successive cars on the randomization of the latter one. In numerical simulations, this model shows the following characteristics. （1） With a simple structure, this model succeeds in reproducing the hysteresis effect, which is absent in the NS model. （2） Compared with the slow-tostart models, this model exhibits a local fundamental diagram which is more consistent to empirical observations. （3） This model has much higher efficiency in dissolving congestions compared with the so-called NS model with velocitydependent randomization （VDR model）. （4） This model is more robust when facing traffic obstructions. It can resist much longer shock times and has much shorter relaxation times on the other hand. To summarize, compared with the existing models, this model is quite simple in structure, but has good characteristics.

关键词： traffic flow headway-distance phase-transition fundamental diagram

N*(1535) contribution in pp→ppη′ and pn→dφ

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Chinese physics C 2009年第12期33卷 1381-1384页

作者：曹须 Institute of modern physics Chinese Academy of Sciences Theoretical physics center for Sciences Facilities Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

In an effective Lagrangian model we find that the N＊（1535） resonance contribution might be important to the interpretation of the present data of the pp →ppη＇ and pn →dφ reactions. The strong coupling strength of N＊（1535） to η＇ and φ are indicated, and the possible implication to the intrinsic component of N＊（1535） is explored. These results may provide hints to the real origin of the OZI rule violation. It is stressed that further measurements could be performed at China. the Cooling Storage Ring （CSR） at Lanzhou of

关键词： meson production nucleon-nucleon collision resonance

Progress in ab initio in-medium similarity renormalization group and coupled-channel method with coupling to the continuum

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Nuclear Science and Techniques 2024年第12期35卷 312-342页

作者： Xin‑Yu Xu Si‑Qin Fan Qi Yuan Bai‑Shan Hu Jian‑Guo Li Si‑Min Wang Fu‑Rong Xu School of physics and State Key Laboratory of Nuclear Physics and TechnologyPeking UniversityBeijing 100871China Southern center for Nuclear‑Science Theory(SCNT)Institute of modern physics Chinese Academy of SciencesHuizhou 516000China National center for Computational Sciences Oak Ridge National LaboratoryOak RidgeTN 37831USA physics Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Institute of modern physics Chinese Academy of SciencesLanzhou 730000China Institute of modern physics Key Laboratory of Nuclear physics and Ion‑beam Application(MOE) Fudan UniversityShanghai 200433China Shanghai Research center for Theoretical Nuclear physics NSFC and Fudan UniversityShanghai 200438China

Over the last decade,nuclear theory has made dramatic progress in few-body and ab initio many-body *** great advances stem from chiral efective feld theory(xEFT),which provides an efcient expansion and consistent treatment of nuclear forces as inputs of modern many-body calculations,among which the in-medium similarity renormalization group(IMSRG)and its variants play a vital *** the other hand,signifcant eforts have been made to provide a unifed description of the structure,decay,and reactions of the nuclei as open quantum *** a fully comprehensive and microscopic model has yet to be realized,substantial progress over recent decades has enhanced our understanding of open quantum systems around the dripline,which are often characterized by exotic structures and decay *** study these interesting phenomena,Gamow coupled-channel(GCC)method,in which the open quantum nature of few-body valence nucleons coupled to a deformed core,has been *** review focuses on the developments of the advanced IMSRG and GCC and their applications to nuclear structure and reactions.

关键词： Ab initio calculations Chiral efective feld theory In-medium similarity renormalization group Gamow coupled channel Resonance and continuum Open quantum systems