Pub Date : 2024-07-03DOI: 10.1088/1361-648X/ad5b43
Antonio Lechiara, Vito Marino, Luca F Tocchio
We perform variational Monte Carlo simulations of the single-band Hubbard model on the square lattice with both nearest (t) and next-nearest (t') neighbor hoppings. Our work investigates the consequences of increasing hole doping on the instauration of stripes and the behavior of the superconducting order parameter, with a discussion on how the two phenomena affect each other. We consider two different values of the next-nearest neighbor hopping parameter, that are appropriate for describing cuprate superconductors. We observe that stripes are the optimal state in a wide doping range; the stripe wavelength reduces at increasing doping, until stripes melt into a uniform state for large values of doping. Superconducting pair-pair correlations, indicating the presence of superconductivity, are always suppressed in the presence of stripes. Our results suggest that the phase diagram for the single-band Hubbard model is dominated by stripes, with superconductivity being possible only in a narrow doping range between striped states and a nonsuperconducting metal.
{"title":"Variational Monte Carlo study of stripes as a function of doping in thet-t'Hubbard model.","authors":"Antonio Lechiara, Vito Marino, Luca F Tocchio","doi":"10.1088/1361-648X/ad5b43","DOIUrl":"10.1088/1361-648X/ad5b43","url":null,"abstract":"<p><p>We perform variational Monte Carlo simulations of the single-band Hubbard model on the square lattice with both nearest (<i>t</i>) and next-nearest (<i>t</i>') neighbor hoppings. Our work investigates the consequences of increasing hole doping on the instauration of stripes and the behavior of the superconducting order parameter, with a discussion on how the two phenomena affect each other. We consider two different values of the next-nearest neighbor hopping parameter, that are appropriate for describing cuprate superconductors. We observe that stripes are the optimal state in a wide doping range; the stripe wavelength reduces at increasing doping, until stripes melt into a uniform state for large values of doping. Superconducting pair-pair correlations, indicating the presence of superconductivity, are always suppressed in the presence of stripes. Our results suggest that the phase diagram for the single-band Hubbard model is dominated by stripes, with superconductivity being possible only in a narrow doping range between striped states and a nonsuperconducting metal.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141446422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-03DOI: 10.1103/physrevb.110.045106
Chu Guo, Ruofan Chen
We present an infinite Grassmann time-evolving matrix product operator method for quantum impurity problems, which directly works in the steady state. The method embraces the well-established infinite matrix product state algorithms with the recently developed GTEMPO method, and benefits from both sides: it obtains real-time Green's functions without sampling noises and bath discretization error, it is applicable for any temperature without the sign problem, and its computational cost is independent of the transient dynamics and does not scale with the number of baths. We benchmark the method on the finite-temperature equilibrium Green's function in the noninteracting limit against exact solutions and in the single-orbital Anderson impurity model against GTEMPO calculations. We also study the zero-temperature nonequilibrium steady state of an impurity coupled to two baths with a voltage bias, obtaining consistent particle currents with existing calculations. The method is ideal for studying steady-state quantum transport, and can be readily used as an efficient real-time impurity solver in the dynamical mean-field theory and its nonequilibrium extension.
{"title":"Infinite Grassmann time-evolving matrix product operator method in the steady state","authors":"Chu Guo, Ruofan Chen","doi":"10.1103/physrevb.110.045106","DOIUrl":"https://doi.org/10.1103/physrevb.110.045106","url":null,"abstract":"We present an infinite Grassmann time-evolving matrix product operator method for quantum impurity problems, which directly works in the steady state. The method embraces the well-established infinite matrix product state algorithms with the recently developed GTEMPO method, and benefits from both sides: it obtains real-time Green's functions without sampling noises and bath discretization error, it is applicable for any temperature without the sign problem, and its computational cost is independent of the transient dynamics and does not scale with the number of baths. We benchmark the method on the finite-temperature equilibrium Green's function in the noninteracting limit against exact solutions and in the single-orbital Anderson impurity model against GTEMPO calculations. We also study the zero-temperature nonequilibrium steady state of an impurity coupled to two baths with a voltage bias, obtaining consistent particle currents with existing calculations. The method is ideal for studying steady-state quantum transport, and can be readily used as an efficient real-time impurity solver in the dynamical mean-field theory and its nonequilibrium extension.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-03DOI: 10.1088/1361-648X/ad5acf
U A Díaz-Reynoso, E Huipe-Domratcheva, O Navarro
Correlated phases in Moiré materials together with the flat-bands in twisted systems play a central role to explain superconductivity in the new twisted bilayer graphene. In this paper, flat-bands are shown to exist in both translated and twisted bilayer of quasicrystals. Such flat-bands arise for different displacements and twisting angles of two-coupled Penrose lattices where Moiré patterns are also shown. Moiré patterns analyzed in this work have at least two inverted worms showing an interference pattern going along the five-fold axes of the pentagon. In order to analyze the behavior of the flat band, our study has been done for fixed interference worm directions but increasing the worm interference density, and for fixed worm interference density but increasing the number of worm directions. In case of rotations, the Moiré patterns that occurs for special angles such asπ/5, 2π/5, 3π/5, 4π/5 andπare discussed in detail because they clearly show flat-bands along with quasicrystalline electronic states at the Fermi level.
{"title":"Flat-bands in translated and twisted bilayer Penrose quasicrystals.","authors":"U A Díaz-Reynoso, E Huipe-Domratcheva, O Navarro","doi":"10.1088/1361-648X/ad5acf","DOIUrl":"10.1088/1361-648X/ad5acf","url":null,"abstract":"<p><p>Correlated phases in Moiré materials together with the flat-bands in twisted systems play a central role to explain superconductivity in the new twisted bilayer graphene. In this paper, flat-bands are shown to exist in both translated and twisted bilayer of quasicrystals. Such flat-bands arise for different displacements and twisting angles of two-coupled Penrose lattices where Moiré patterns are also shown. Moiré patterns analyzed in this work have at least two inverted worms showing an interference pattern going along the five-fold axes of the pentagon. In order to analyze the behavior of the flat band, our study has been done for fixed interference worm directions but increasing the worm interference density, and for fixed worm interference density but increasing the number of worm directions. In case of rotations, the Moiré patterns that occurs for special angles such as<i>π</i>/5, 2<i>π</i>/5, 3<i>π</i>/5, 4<i>π</i>/5 and<i>π</i>are discussed in detail because they clearly show flat-bands along with quasicrystalline electronic states at the Fermi level.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141437079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-03DOI: 10.1103/physrevd.110.014002
E. G. S. Luna, M. G. Ryskin, V. A. Khoze
We perform the analysis of elastic scattering and data at low momentum transfer within large collider energy interval in order to evaluate quantitatively the possible Odderon contribution. We use the two-channel eikonal model, which naturally accounts for the screening of the Odderon amplitude by -even (Pomeron) exchanges.
{"title":"Odderon contribution in light of the LHC low-t data","authors":"E. G. S. Luna, M. G. Ryskin, V. A. Khoze","doi":"10.1103/physrevd.110.014002","DOIUrl":"https://doi.org/10.1103/physrevd.110.014002","url":null,"abstract":"We perform the analysis of elastic scattering <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>p</mi><mi>p</mi></math> and <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mover accent=\"true\"><mi>p</mi><mo stretchy=\"false\">¯</mo></mover><mi>p</mi></math> data at low momentum transfer <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo stretchy=\"false\">|</mo><mi>t</mi><mo stretchy=\"false\">|</mo><mo><</mo><mn>0.1</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi>GeV</mi></mrow><mrow><mn>2</mn></mrow></msup></math> within large collider energy interval <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>50</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mi>–</mi><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math> in order to evaluate quantitatively the possible Odderon contribution. We use the two-channel eikonal model, which naturally accounts for the screening of the Odderon amplitude by <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi></math>-even (Pomeron) exchanges.","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-03DOI: 10.1103/physrevb.110.l020301
Andrea Pizzi, Norman Y. Yao
Information theoretic measures have helped to sharpen our understanding of many-body quantum states. As perhaps the most well-known example, the entanglement entropy (or more generally, the bipartite mutual information) has become a powerful tool for characterizing the dynamical growth of quantum correlations. By contrast, although computable, the bipartite mutual information (MI) is almost never explored in classical many particle systems; this owes in part to the fact that computing the MI requires keeping track of the evolution of the full probability distribution, a feat which is rarely done (or thought to be needed) in classical many-body simulations. Here, we utilize the MI to analyze the spreading of information in 1D elementary cellular automata (CA). Broadly speaking, we find that the behavior of the MI in these dynamical systems exhibits a few different types of scaling that roughly correspond to known CA universality classes. Of particular note is that we observe a set of automata for which the MI converges parametrically slowly to its thermodynamic value. We develop a microscopic understanding of this behavior by analyzing a two-species model of annihilating particles moving in opposite directions. Our work suggests the possibility that information theoretic tools such as the MI might enable a more fine-grained characterization of classical many-body states and dynamics.
信息论测量有助于加深我们对多体量子态的理解。最著名的例子可能是纠缠熵（或更广义的双向互信息），它已成为表征量子相关性动态增长的有力工具。相比之下，尽管双向互信息（MI）是可计算的，但在经典多粒子系统中几乎从未被探索过；部分原因在于计算 MI 需要跟踪完整概率分布的演化，而这在经典多体模拟中很少实现（或被认为需要）。在这里，我们利用 MI 分析一维基本细胞自动机（CA）中的信息传播。概括地说，我们发现 MI 在这些动力学系统中的行为表现出几种不同类型的缩放，大致对应于已知的 CA 普遍性类别。特别值得注意的是，我们观察到一组自动机的 MI 缓慢地收敛到其热力学值。我们通过分析一个反向运动的湮灭粒子的双物种模型，从微观上理解了这种行为。我们的研究表明，MI 等信息论工具有可能对经典多体状态和动力学进行更精细的描述。
{"title":"Bipartite mutual information in classical many-body dynamics","authors":"Andrea Pizzi, Norman Y. Yao","doi":"10.1103/physrevb.110.l020301","DOIUrl":"https://doi.org/10.1103/physrevb.110.l020301","url":null,"abstract":"Information theoretic measures have helped to sharpen our understanding of many-body quantum states. As perhaps the most well-known example, the entanglement entropy (or more generally, the bipartite mutual information) has become a powerful tool for characterizing the dynamical growth of quantum correlations. By contrast, although computable, the bipartite mutual information (MI) is almost never explored in classical many particle systems; this owes in part to the fact that computing the MI requires keeping track of the evolution of the full probability distribution, a feat which is rarely done (or thought to be needed) in classical many-body simulations. Here, we utilize the MI to analyze the spreading of information in 1D elementary cellular automata (CA). Broadly speaking, we find that the behavior of the MI in these dynamical systems exhibits a few different types of scaling that roughly correspond to known CA universality classes. Of particular note is that we observe a set of automata for which the MI converges parametrically slowly to its thermodynamic value. We develop a microscopic understanding of this behavior by analyzing a two-species model of annihilating particles moving in opposite directions. Our work suggests the possibility that information theoretic tools such as the MI might enable a more fine-grained characterization of classical many-body states and dynamics.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-03DOI: 10.1103/physrevb.110.035201
Yufei Ge, Weitang Li, Jiajun Ren, Zhigang Shuai
Organic molecular materials are potential high-performance thermoelectric materials. Theoretical understanding of thermoelectric conversion in organic materials is essential for rational molecular design for efficient energy conversion materials. In organic materials, nonlocal electron-phonon coupling plays a vital role in charge transport and leads to complex transport mechanisms, including hopping, phonon assisted, band, and transient localization. In this work, based on the time-dependent density matrix renormalization group method, we look at the role of nonlocal electron-phonon coupling on the thermoelectric conversion in organic systems described by the Holstein-Peierls model. We calculate the current-current correlation and the heat current-current correlation functions. We find that (i) nonlocal electron-phonon coupling has a very weak influence on the Seebeck coefficient because of the cancellation between the heat current-current correlation function and the current-current correlation function, but it has a strong influence on the conductivity through dynamic disorders; and (ii) doping concentration has a strong influence on both the conductivity and Seebeck coefficient, and the optimal doping ratio to reach the highest power factor is 3%–10% fillings when the Holstein-Peierls model is valid. These findings suggest that we can design organic materials with higher power factors by first enhancing mobility through rational design, and then searching for the optimal doping ratio.
{"title":"Roles of nonlocal electron-phonon coupling on the electrical conductivity and Seebeck coefficient: A time-dependent DMRG study","authors":"Yufei Ge, Weitang Li, Jiajun Ren, Zhigang Shuai","doi":"10.1103/physrevb.110.035201","DOIUrl":"https://doi.org/10.1103/physrevb.110.035201","url":null,"abstract":"Organic molecular materials are potential high-performance thermoelectric materials. Theoretical understanding of thermoelectric conversion in organic materials is essential for rational molecular design for efficient energy conversion materials. In organic materials, nonlocal electron-phonon coupling plays a vital role in charge transport and leads to complex transport mechanisms, including hopping, phonon assisted, band, and transient localization. In this work, based on the time-dependent density matrix renormalization group method, we look at the role of nonlocal electron-phonon coupling on the thermoelectric conversion in organic systems described by the Holstein-Peierls model. We calculate the current-current correlation and the heat current-current correlation functions. We find that (i) nonlocal electron-phonon coupling has a very weak influence on the Seebeck coefficient because of the cancellation between the heat current-current correlation function and the current-current correlation function, but it has a strong influence on the conductivity through dynamic disorders; and (ii) doping concentration has a strong influence on both the conductivity and Seebeck coefficient, and the optimal doping ratio to reach the highest power factor is 3%–10% fillings when the Holstein-Peierls model is valid. These findings suggest that we can design organic materials with higher power factors by first enhancing mobility through rational design, and then searching for the optimal doping ratio.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-03DOI: 10.1103/physrevb.110.035113
Yu-Peng Wang, Chen Fang, Jie Ren
A quantum many-body system subject to unitary evolution and repeated local measurements with an increasing rate undergoes a measurement-induced entanglement transition from extensive (or subextensive) to area law entropy scaling. We find that certain open boundary systems under “generalized monitoring,” consisting of “projective monitoring” and conditional feedback, display an anomalous late-time particle concentration on the edge, reminiscent of the “skin effect” in non-Hermitian systems. Such feedback-induced skin effect will suppress the entanglement generation, rendering the system short-range entangled without measurement-induced entanglement transition. While initially emerged in noninteracting models, such skin effect can also occur in chaotic interacting systems and Floquet quantum circuits subjected to random generalized measurements. Since the dynamics of the skin effect do not require postselection and can be observed at the particle number level, the phenomenon is experimentally relevant and accessible in noisy intermediate-scale quantum platforms, such as trapped ions.
{"title":"Absence of measurement-induced entanglement transition due to feedback-induced skin effect","authors":"Yu-Peng Wang, Chen Fang, Jie Ren","doi":"10.1103/physrevb.110.035113","DOIUrl":"https://doi.org/10.1103/physrevb.110.035113","url":null,"abstract":"A quantum many-body system subject to unitary evolution and repeated local measurements with an increasing rate undergoes a measurement-induced entanglement transition from extensive (or subextensive) to area law entropy scaling. We find that certain open boundary systems under “generalized monitoring,” consisting of “projective monitoring” and conditional feedback, display an anomalous late-time particle concentration on the edge, reminiscent of the “skin effect” in non-Hermitian systems. Such feedback-induced skin effect will suppress the entanglement generation, rendering the system short-range entangled without measurement-induced entanglement transition. While initially emerged in noninteracting models, such skin effect can also occur in chaotic interacting systems and Floquet quantum circuits subjected to random generalized measurements. Since the dynamics of the skin effect do not require postselection and can be observed at the particle number level, the phenomenon is experimentally relevant and accessible in noisy intermediate-scale quantum platforms, such as trapped ions.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-03DOI: 10.1103/physrevd.110.012001
I. Adachiet al.(Belle II Collaboration)
We present GFlaT, a new algorithm that uses a graph-neural-network to determine the flavor of neutral mesons produced in decays. It improves previous algorithms by using the information from all charged final-state particles and the relations between them. We evaluate its performance using decays to flavor-specific hadronic final states reconstructed in a sample of electron-positron collisions collected at the resonance with the Belle II detector at the SuperKEKB collider. We achieve an effective tagging efficiency of , where the first uncertainty is statistical and the second systematic, which is 18% better than the previous Belle II algorithm. Demonstrating the algorithm, we use decays to measure the mixing-induced and direct violation parameters, and .
我们提出了一种新算法GFlaT，它使用图神经网络来确定在ϒ(4S)衰变中产生的中性B介子的味道。它利用所有带电终态粒子的信息以及它们之间的关系改进了以前的算法。我们利用在超级KEKB对撞机的Belle II探测器的ϒ(4S)共振中收集到的362 fb-1电子-正电子对撞样本中重建的B衰变到特定味道的强子终态来评估它的性能。我们实现了（37.40±0.43±0.36%）的有效标记效率，其中第一个不确定性是统计不确定性，第二个不确定性是系统不确定性，这比之前的 Belle II 算法提高了 18%。为了演示该算法，我们利用B0→J/ψKS0衰变测量了混合诱导和直接CP违反参数S=(0.724±0.035±0.009)和C=(-0.035±0.026±0.029)。
{"title":"New graph-neural-network flavor tagger for Belle II and measurement of sin 2ϕ1 in B0→J/ψKS0 decays","authors":"I. Adachiet al.(Belle II Collaboration)","doi":"10.1103/physrevd.110.012001","DOIUrl":"https://doi.org/10.1103/physrevd.110.012001","url":null,"abstract":"We present GFlaT, a new algorithm that uses a graph-neural-network to determine the flavor of neutral <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi></math> mesons produced in <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi mathvariant=\"normal\">ϒ</mi><mo stretchy=\"false\">(</mo><mn>4</mn><mi>S</mi><mo stretchy=\"false\">)</mo></math> decays. It improves previous algorithms by using the information from all charged final-state particles and the relations between them. We evaluate its performance using <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>B</mi></math> decays to flavor-specific hadronic final states reconstructed in a <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mn>362</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> sample of electron-positron collisions collected at the <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi mathvariant=\"normal\">ϒ</mi><mo stretchy=\"false\">(</mo><mn>4</mn><mi>S</mi><mo stretchy=\"false\">)</mo></math> resonance with the Belle II detector at the SuperKEKB collider. We achieve an effective tagging efficiency of <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo stretchy=\"false\">(</mo><mn>37.40</mn><mo>±</mo><mn>0.43</mn><mo>±</mo><mn>0.36</mn><mo>%</mo><mo stretchy=\"false\">)</mo></math>, where the first uncertainty is statistical and the second systematic, which is 18% better than the previous Belle II algorithm. Demonstrating the algorithm, we use <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>B</mi><mn>0</mn></msup><mo stretchy=\"false\">→</mo><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow><msubsup><mi>K</mi><mi mathvariant=\"normal\">S</mi><mn>0</mn></msubsup></math> decays to measure the mixing-induced and direct <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mi>P</mi></math> violation parameters, <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi><mo>=</mo><mo stretchy=\"false\">(</mo><mn>0.724</mn><mo>±</mo><mn>0.035</mn><mo>±</mo><mn>0.009</mn><mo stretchy=\"false\">)</mo></math> and <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>C</mi><mo>=</mo><mo stretchy=\"false\">(</mo><mo>−</mo><mn>0.035</mn><mo>±</mo><mn>0.026</mn><mo>±</mo><mn>0.029</mn><mo stretchy=\"false\">)</mo></math>.","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-03DOI: 10.1103/physrevb.110.035112
R. Eder, P. Wróbel
We investigate the formation of magnetic polarons in the Kondo lattice model. Calculations are done in the framework of the bond particle formalism. We show that the quasiparticles correspond to spin polarons with a -dependent spatial extent. Polaron formation leads to a significant enhancement of the effective mass in the heavy parts of the band structure.
我们研究了近藤晶格模型中磁极子的形成。计算是在键粒子形式主义框架内完成的。我们证明，准粒子对应于空间范围取决于 k 的自旋极子。极子的形成导致带状结构重元素部分的有效质量显著增强。
{"title":"Magnetic polarons in the Kondo lattice","authors":"R. Eder, P. Wróbel","doi":"10.1103/physrevb.110.035112","DOIUrl":"https://doi.org/10.1103/physrevb.110.035112","url":null,"abstract":"We investigate the formation of magnetic polarons in the Kondo lattice model. Calculations are done in the framework of the bond particle formalism. We show that the quasiparticles correspond to spin polarons with a <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi mathvariant=\"bold\">k</mi></math>-dependent spatial extent. Polaron formation leads to a significant enhancement of the effective mass in the <i>heavy</i> parts of the band structure.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-03DOI: 10.1103/physrevd.110.015002
Sally Dawson, Matthew Forslund, Marvin Schnubel
Heavy neutral gauge bosons arise in many motivated models of beyond the Standard Model Physics. Experimental searches require that such gauge bosons are above the TeV scale in most models which means that the tools of effective field theories, in particular the Standard Model effective field theory (SMEFT), are useful. We match the SMEFT to models with heavy bosons, including effects of dimension-8 operators, and consider the restrictions on model parameters from electroweak precision measurements and from Drell Yan invariant mass distributions and forward-backward asymmetry, , measurements at the LHC. The results demonstrate the model dependence of the resulting limits on SMEFT coefficients and the relatively small impact of including dimension-8 matching. In all cases, the limits from invariant mass distributions are stronger than from measurements in the models we consider.
重中性规玻色子出现在许多超越标准模型物理的动机模型中。实验搜索要求这种规玻色子在大多数模型中都在 TeV 尺度以上，这意味着有效场理论，特别是标准模型有效场理论（SMEFT）的工具是有用的。我们将 SMEFT 与重 Z′玻色子模型相匹配，包括第八维算子的影响，并考虑电弱精确测量和德雷尔-燕不变质量分布以及大型强子对撞机的前后不对称测量对模型参数的限制。结果表明了由此产生的 SMEFT 系数限制与模型的相关性，以及包含维度-8 匹配的相对较小的影响。在所有情况下，在我们考虑的Z′模型中，来自质量不变性分布的限制都强于来自AFB测量的限制。
{"title":"SMEFT matching to Z′ models at dimension eight","authors":"Sally Dawson, Matthew Forslund, Marvin Schnubel","doi":"10.1103/physrevd.110.015002","DOIUrl":"https://doi.org/10.1103/physrevd.110.015002","url":null,"abstract":"Heavy neutral gauge bosons arise in many motivated models of beyond the Standard Model Physics. Experimental searches require that such gauge bosons are above the TeV scale in most models which means that the tools of effective field theories, in particular the Standard Model effective field theory (SMEFT), are useful. We match the SMEFT to models with heavy <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow></math> bosons, including effects of dimension-8 operators, and consider the restrictions on model parameters from electroweak precision measurements and from Drell Yan invariant mass distributions and forward-backward asymmetry, <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>A</mi><mi>FB</mi></msub></math>, measurements at the LHC. The results demonstrate the model dependence of the resulting limits on SMEFT coefficients and the relatively small impact of including dimension-8 matching. In all cases, the limits from invariant mass distributions are stronger than from <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>A</mi><mi>FB</mi></msub></math> measurements in the <math display=\"inline\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mi>Z</mi><mo>′</mo></msup></math> models we consider.","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号