Relevant bibliographies by topics / Nucleon axial charge

Academic literature on the topic 'Nucleon axial charge'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Nucleon axial charge"

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Kojo, Toru. "Can the nucleon axial charge be ?" Nuclear Physics A 899 (February 2013): 76–106. http://dx.doi.org/10.1016/j.nuclphysa.2012.12.116.

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GAMBERG, LEONARD, and GARY R. GOLDSTEIN. "FLAVOR-SPIN SYMMETRY AND THE TENSOR CHARGE." International Journal of Modern Physics A 18, no. 08 (March 30, 2003): 1297–302. http://dx.doi.org/10.1142/s0217751x03014630.

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Exploiting an approximate phenomenological symmetry of the JPC = 1+- light axial vector mesons and using pole dominance, we calculate the flavor contributions to the nucleon tensor charge. The result depends on the decay constants of the axial vector mesons and their couplings to the nucleons.
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Kirchbach, M., D. O. Riska, and K. Tsushima. "The axial exchange charge operator and the nucleon-nucleon interaction." Nuclear Physics A 542, no. 4 (June 1992): 616–30. http://dx.doi.org/10.1016/0375-9474(92)90260-q.

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Birse, Michael C. "The axial charge of a nucleon in matter." Physics Letters B 316, no. 4 (October 1993): 472–75. http://dx.doi.org/10.1016/0370-2693(93)91030-q.

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Renner, D. B., R. G. Edwards, G. Fleming, Ph Hägler, J. W. Negele, K. Orginos, A. V. Pochinsky, D. G. Richards, and W. Schroers. "Calculation of the nucleon axial charge in lattice QCD." Journal of Physics: Conference Series 46 (September 1, 2006): 152–56. http://dx.doi.org/10.1088/1742-6596/46/1/021.

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He, Han-Xin, Nader Mobed, and Faqir C. Khanna. "The 1/Nc corrections to static properties of nucleons in the Skyrme model." Canadian Journal of Physics 66, no. 11 (November 1, 1988): 994–96. http://dx.doi.org/10.1139/p88-161.

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Corrections of O(1/Nc) to static properties of nucleons in the Skyrme model are calculated. The O(1/Nc) corrections due to quantization of collective coordinates are less than 4% for the axial charge and magnetic moment of the nucleon.
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Jang, Yong-Chull, Tanmoy Bhattacharya, Rajan Gupta, Huey-Wen Lin, and Boram Yoon. "Nucleon Axial and Electromagnetic Form Factors." EPJ Web of Conferences 175 (2018): 06033. http://dx.doi.org/10.1051/epjconf/201817506033.

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We present results for the isovector axial, induced pseudoscalar, electric, and magnetic form factors of the nucleon. The calculations were done using 2 + 1 + 1-flavor HISQ ensembles generated by the MILC collaboration with lattice spacings a ≈ 0.12, 0.09, 0.06 fm and pion masses Mπ ≈ 310, 220, 130 MeV. Excited-states contamination is controlled by using four-state fits to two-point correlators and by comparing two-versus three-states in three-point correlators. The Q2 behavior is analyzed using the model independent z-expansion and the dipole ansatz. Final results for the charge radii and magnetic moment are obtained using a simultaneous fit in Mπ, lattice spacing a and finite volume.
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Ali Khan, A., M. Göckeler, P. Hägler, T. R. Hemmert, R. Horsley, A. C. Irving, D. Pleiter, et al. "Axial and tensor charge of the nucleon with dynamical fermions." Nuclear Physics B - Proceedings Supplements 140 (March 2005): 408–10. http://dx.doi.org/10.1016/j.nuclphysbps.2004.11.320.

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Ohta, Shigemi, and Kostas Orginos. "Nucleon axial charge and structure functions with domain wall fermions." Nuclear Physics B - Proceedings Supplements 129-130 (March 2004): 296–98. http://dx.doi.org/10.1016/s0920-5632(03)02561-1.

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FRITZSCH, HARALD. "THE NUCLEON: ITS SPIN, AXIAL CHARGE AND THE CHIRAL SYMMETRY." Modern Physics Letters A 05, no. 23 (September 20, 1990): 1815–24. http://dx.doi.org/10.1142/s0217732390002079.

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Dissertations / Theses on the topic "Nucleon axial charge"

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Pefkou, Dimitra Anastasia. "Calculation of the axial charge of a heavy nucleon in Lattice QCD." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/111890.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 55-57).
In this thesis, we aim to calculate the non-renormalized axial charge gA of a heavy nucleon made out of quarks at the physical mass of the strange quark. We present the framework of Lattice QCD which makes the calculation of such observables attainable from first principles. The data used for the estimation of gA were obtained on a 243 x64 hypercubic lattice with lattice spacing a ~ 0.12 fm and pion mass m[pi] = 0.450 GeV. Three different source-sink seperations were used, tsink = [12a, 14a, 16a]. For each timeslice seperation signal we perform a correlated x2 fit and obtain the following values for gA: 0.551, 0.564 and 0.556. The unrenormalized value value for gA is extracted taking the limit as tsink --> [infinity] and is shown to be gA = 0.558. We discuss how the accuracy of this result is compromised by the small number of tsink values, by excited state contamination and by the increase of statistical noise with time.
by Dimitra Anastasia Pefkou.
S.B.
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Métivet, Thibaut. "Lattice QCD at the physical point : pion-pion scattering and structure of the nucleon." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112243/document.

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La Chromodynamique Quantique (QCD) sur réseau permet d'étudier de façon ab-initio et non-perturbative les processus d'interaction forte. Ce formalisme, qui permet une régularisation covariante de la théorie de l'interaction forte, fournit aussi un cadre naturel pour le calcul et la simulation numérique de la Chromodynamique Quantique. Dans cette thèse, après un tour d'horizon des principales propriétés de la QCD et une présentation détaillée de notre discrétisation de cette théorie sur un réseau, nous étudions de façon approfondie deux problèmes de physique hadronique : le phénomène de diffusion résonante et la structure du nucléon. Les calculs sont réalisés avec les configurations de jauge de la Collaboration Budapest-Marseille-Wuppertal, générées avec une action de Wilson améliorée avec 2+1 saveurs de quarks dynamiques. Elles couvrent une large gamme de pas de réseau, de volumes et de masses des quarks différents, permettant ainsi une étude fine de la sensibilité de nos résultats à ces paramètres, et fournissant un bon contrôle sur l'extrapolation au continu. Notre étude de la diffusion de particules sur le réseau est menée grâce à une méthode proposée par M. Lüscher. Nous avons choisi le cas particulier de la diffusion pion-pion dans le canal résonant du méson rho, et analysé nos données avec une méthode variationnelle aux valeurs propres généralisées. Nous présentons les déphasages pion-pion ainsi que les paramètres de la résonance obtenus de façon détaillée, tout en garantissant un bon contrôle de nos erreurs systématiques. Nos résultats apportent une avancée importante dans le panorama des études de diffusion sur le réseau car ce sont les premiers réalisés à la masse physique du pion, pour laquelle la désintégration du rho en deux pions peut effectivement avoir lieu. Les valeurs obtenues pour les paramètres de la résonance du méson rho sont accord avec l'expérience, et confirment la faible dépendance du couplage entre le rho et les deux pions à la masse du pion. L'exploration de la structure du nucléon se fait à travers un calcul complet des facteurs de forme électrofaibles isovectoriels, avec une étude approfondie du rayon de charge électrique et de la charge axiale. Notre analyse présente aussi des données à la masse physique du pion, ce qui s'avère crucial pour maîtriser les extrapolations au point physique, étant données les variations violentes prédites par la perturbation chirale de ces quantités. Notre calcul utilise une projection sur les états du nucléon à la source et au puits, et une méthode de fit combinant les fonctions de corrélation à deux et trois points afin de réduire et de contrôler au maximum les contaminations pouvant venir des états excités. Bien que davantage de données seraient nécessaires pour déterminer très précisément le rayon et la charge axiale au point physique avec une évaluation pertinente des erreurs systématiques, les valeurs que nous obtenons sont en bon accord avec l'expérience, et suggèrent que les effets dus aux états excités sont faibles et sous contrôle. Notre analyse souligne aussi que l'utilisation de configurations de jauge avec des masses de pion proches de la valeur physique et avec des grands volumes semble indispensable à une étude précise de la structure du nucléon sur réseau
The formalism of Quantum Chromodynamics on the lattice (or Lattice QCD) allows to perform ab-initio non-perturbative studies of strong-interaction driven processes, as it provides both a covariant regularisation of the theory of QCD and a natural framework for numerical computations. In this work, after a review of the main features of QCD and a step-by-step presentation of our discretization of QCD on a lattice, we undertake detailed studies of two problems of hadronic physics: the phenomenon of resonant scattering and the structure of the nucleon. The lattice calculations are performed with the Budapest-Marseille-Wuppertal Collaboration's 2+1-flavour gauge configurations, which give access to a wide range of lattice spacings, volumes and quarks masses, thereby allowing to study the sensibility of our results on these parameters, and to perform a complete continuum extrapolation. These configurations include dynamical quarks, and use a clover-improved Wilson QCD action. To investigate the scattering of particles on the lattice, we set up a Lüscher analysis for the emblematic case of pion-pion scattering in the channel of the rho meson resonance. We analyse our data with a variational generalized eigenvalue method, and give an in-depth calculation of the scattering phase-shifts and the corresponding resonance parameters, with a full control of the systematic errors. Our results provide an important step for lattice studies of scattering states, as they are the first to be performed at the physical pion mass, where one can see the actual decay of the rho into two pions. The obtained rho meson parameters are in good agreement with the experimental values, and consistent with a weak pion mass dependence of the coupling between the rho and two pions. As for our probe of the structure of the nucleon, we present a complete extraction of the electroweak isovector form factors, with a comprehensive study of the electric charge squared radius and of the axial charge. Our analysis also feature data at the physical pion mass, which turns out to be crucial in order to perform safe extrapolations to the physical point, as the chiral perturbation theory predicts violent variations of these quantities near the massless-quarks point. Our calculation includes source and sink projections onto the nucleon state, as well as a combined fit method between the two-point and three-point correlation functions to control the contamination of our data by excited states. Although one would need more data to perform a high-accuracy determination of the nucleon radius and axial charge at the physical point with a relevant estimation of the systematic errors, the results we obtain are in good agreement with the experiment and suggest that the excited-state effects are under control. Our analysis also highlights that gauge configurations ensembles near the physical pion mass and with large volumes must be used in order to extract accurate information about the nucleon structure from lattice calculations
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Maurer, Thilo [Verfasser], and Andreas [Akademischer Betreuer] Schäfer. "The QPACE supercomputer, renormalization of dynamical CI fermions, axial charges of excited nucleons / Thilo Maurer. Betreuer: Andreas Schäfer." Regensburg : Universitätsbibliothek Regensburg, 2011. http://d-nb.info/102287229X/34.

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Harraud, Pierre-Antoine. "Etude de la structure du nucléon par des calculs de QCD sur réseau avec des fermions de masse twistée." Phd thesis, Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00546526.

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La compréhension de la structure interne du nucléon à partir de la ChromoDynamique Quantique est un enjeu majeur de la physique hadronique. Seule la QCD sur réseau permet d'évaluer numériquement les observables à partir des principes ab-initio. Le sujet de cette thèse est l'étude des facteurs de forme du nucléon et le premier moment des fonctions de distributions de partons en utilisant une action discrétisée avec des fermions de masse twistée. Cette dernière a l'avantage de supprimer les effets de discrétisation au premier ordre en la maille du réseau. D'autre part, l'ensemble des simulations permet un contrôle accru des erreurs systématiques. Après avoir détaillé les techniques de calcul utilisées, je présenterai les résultats obtenus pour un large éventail de paramètres, mailles de réseau variant entre 0.056 fm et 0.089 fm, volumes compris entre 2.1 et 2.7 fm et masses de pions dans le domaine 260-470 MeV. La constante de renormalisation vectorielle a ainsi été obtenue dans le secteur du nucléon avec une grande précision. Pour le rayon de charge électrique, les effets de volume fini mis en évidence fournissent une clef pour expliquer sa dépendance chirale vers le point physique. Les résultats pour le moment magnétique et axial, les fractions d'impulsion et d'hélicité portées par les quarks, ne présentent pas d'effets de discrétisation ni de volume fini significatifs. Aux masses de pions considérées, leurs valeurs montrent une déviation par rapport aux valeurs expérimentales, leur comportement chiral n'exhibant pas la courbure prédite par les perturbations chirales qui permettrait de résoudre ce désaccord apparent.
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Chambers, Alexander John. "Hadron structure and the Feynman-Hellmann theorem in lattice quantum chromodynamics." Thesis, 2018. http://hdl.handle.net/2440/114262.

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The vast majority of visible matter in the universe is made up of protons and neutrons, the fundamental building blocks of atomic nuclei. Protons and neutrons are examples of hadrons, composite states formed from point-like quarks and gluons. Understanding the dynamics of quarks and gluons inside hadrons has far-reaching implications, from the properties of heavy nuclei to the dynamics of neutron stars. Quantum Chromodynamics (QCD) is the gauge field theory (GFT) describing the interactions of colour-charged quarks and gluons. At the low energy scales relevant to hadron structure calculations, QCD is non-perturbative, and the techniques applied to other GFTs cannot be used. At the forefront of the non-perturbative methods is Lattice QCD, a first-principles approach in which physical observables are calculated numerically through a discretisation of the Feynman path integral. Hadron structure calculations in lattice QCD have made significant advances in recent years, however many challenges still remain. Most notably amongst these are precise calculations of ‘disconnected’ contributions to hadronic quantities, the control of excited-state contamination, and the calculation of matrix elements at large boosts. In this thesis we develop and show how a method based on the Feynman-Hellmann (FH) theorem deals with many of these issues. The method allows matrix elements to be determined indirectly, through the introduction of artificial couplings to the QCD Lagrangian, and the calculation of the resulting shifts in the hadron spectrum. We have calculated disconnected contributions to the axial charge of the nucleon, and see excellent agreement with existing stochastic results, as well as good excited-state control. Our results for the electromagnetic form factors of the proton are the first in lattice to show agreement with the linear decrease of GE,p/GM,p [E,p and M,p subscript] observed in experiment. Additionally, exploratory simulations have shown that an extension of the FH theorem to second order allows direct access to the structure functions of the nucleon, another first in lattice QCD. These calculations demonstrate an expanded scope for lattice studies of hadronic observables, particular for processes involving high momentum transfer. Extensions of this work will have important implications for future experimental investigations at the upgraded Continuous Electron Beam Accelerator Facility.
Thesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2018
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Dragos, Jack. "Improved determination of hadron matrix elements using the variational method." Thesis, 2017. http://hdl.handle.net/2440/106302.

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Utilising lattice QCD to calculate nucleon matrix elements has had a huge impact on the knowledge of the structure of nucleons. From the comparison to experimental data, to the new insights into the structure of nucleons, the practices of lattice QCD has cemented itself as a fundamental field for particle physics. Some key contributions to the understanding of nucleon structure lattice QCD can provide are parameters needed for the beyond standard model (BSM) extensions, understanding the size of the nucleons via the charge radii and the decomposition of the spin and angular momentum of the quarks and gluons within the nucleon. But the extraction of hadron matrix elements in lattice QCD using the standard two- and three-point correlator functions demands careful attention to systematic uncertainties. Although other systematics including discretisation, renormalisation and chiral extrapolation effects need to be analysed, one of the most recent and emerging sources of systematic error is contamination from excited-states. This thesis applies the variational method to calculate the axial vector current gA [A subscript], the scalar current gS [S subscript], the tensor current gT [T subscript] and the quark momentum fraction hxi of the nucleon and we compare the results to the more commonly used summation and two-exponential fit methods. Proceeding with the same comparison of methods, we extend the calculation to non-zero momentum transfer to access the vector form factors for both the proton and neutron, as well as the iso-vector combination of the axial and induced pseudoscalar form factors for the proton. The results demonstrate how excited-states affect the extraction of nucleon matrix elements and in the process discovering that the variational approach offers a more efficient and robust method for the determination of nucleon matrix elements. Through this demonstration of how excited-states impact lattice QCD calculation and how we can use methods to suppress these excited-states, we can hope to achieve higher and higher precision determinations of nucleon matrix elements form lattice QCD which will aid in our understanding of the structure of nucleons.
Thesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2017.
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Asavapibhop, Burin. "Study of the axial anomaly in the (gamma-proton going to charged-pion neutral-pion neutron) reaction at low t using the clas and the photon tagger." 2000. https://scholarworks.umass.edu/dissertations/AAI9978469.

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While the agreement between theory and experiment is excellent for the π 0 → 2γ reaction, other reactions that proceed through the axial anomaly have been poorly tested. For example the existing measurement of the γ → 3π amplitude, F3π, is in poor agreement with theory. In the limit of low s and t, the γp → π+π 0n reaction is sensitive to F 3π. In this thesis preliminary cross sections for the γp → π +π0n reaction are presented using the CLAS with tagged photon energies between 1 and 2 GeV and over a range in s and t up to 1 GeV2. The π+ was detected using the time-of-flight and tracking systems. The π0 was detected via reconstruction of the invariant mass of its two decay photons, which were detected by an electromagnetic calorimeter. The presence of the neutron was inferred via missing mass. The sensitivity of these cross sections to F3π in the low t region is studied for s = [special characters omitted] and s = [special characters omitted] at Eγ = 2 GeV. The results show a momentum dependence of the F3π and are consistent with a calculation that includes the effects of ππ final state interactions on the chiral perturbation prediction for F 3π.
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Book chapters on the topic "Nucleon axial charge"

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Kirchbach, M. "Chiral Symmetry and Axial Charge Sum Rules." In Spin and Isospin in Nuclear Interactions, 181–94. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3834-9_16.

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Milone, Margherita, and Teerin Liewluck. "Progressive Weakness and Rash." In Mayo Clinic Cases in Neuroimmunology, edited by Andrew McKeon, B. Mark Keegan, and W. Oliver Tobin, 154–56. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780197583425.003.0050.

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A 47-year-old man with hypercholesterolemia sought care for a 4-month history of progressive, proximal upper limb weakness and myalgia, followed by dysphagia, difficulty climbing stairs, and facial rash. Discontinuation of atorvastatin was of no benefit. Neurologic examination showed moderate weakness of the neck flexor muscles, shoulder girdle muscles, and finger extensors, and mild weakness of hip flexor and ankle dorsiflexor muscles. He had a heliotrope rash and Gottron sign. Serum testing showed an increased creatine kinase level. Needle electromyography showed myopathic changes with fibrillation potentials in proximal and axial muscles. Biopsy of the deltoid demonstrated a perifascicular pathologic process, including muscle fiber atrophy, and perivascular inflammatory exudate in the perimysium. Immunocytochemical studies showed patchy loss of intramuscular capillaries, some of which had complement (C5b9) deposition, and sarcoplasmic expression of myxovirus resistance protein A, mainly in the perifascicular regions. Immunologic testing was positive for autoantibodies to nuclear matrix protein 2 and negative for 3-hydroxy-3-methylglutaryl–coenzyme A reductase antibodies. Video swallow studies showed oropharyngeal dysphagia. Pulmonary function tests indicated mildly decreased maximal respiratory pressures but normal diffusing lung capacity for carbon monoxide. The findings were consistent with a diagnosis of dermatomyositis. The patient was started on oral prednisone and azathioprine, after checking for adequate thiopurine methyltransferase activity. Liver function tests and complete blood cell count with differential were assessed to monitor for potential azathioprine toxicity. Intravenous immunoglobulin was given. Follow-up examination revealed mild weakness of the shoulder girdle muscles after immunotherapy, and normal strength and creatine kinase value while on azathioprine monotherapy. Dermatomyositis is an idiopathic inflammatory myopathy. Idiopathic inflammatory myopathy is a group of autoimmune muscle diseases that includes dermatomyositis, polymyositis, inclusion body myositis, immune-mediated necrotizing myopathy, and overlap myositis, including antisynthetase syndrome.
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Conference papers on the topic "Nucleon axial charge"

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Walker-Loud, Andre, Evan Berkowitz, Arjun S. Gambhir, David Brantley, Pavlos Vranas, Chris Bouchard, M. A. Clark, et al. "Lattice QCD determination of the nucleon axial charge." In The 9th International workshop on Chiral Dynamics. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.317.0020.

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Hall, Nathan L., Anthony W. Thomas, and Ross D. Young. "Finite Volume Corrections to the Nucleon Axial Charge." In 8TH CIRCUM‐PAN‐PACIFIC SYMPOSIUM ON HIGH ENERGY SPIN PHYSICS: PacSPIN2011. American Institute of Physics, 2011. http://dx.doi.org/10.1063/1.3667315.

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Baer, Oliver. "Nucleon-pion-state contributions in the determination of the nucleon axial charge." In The 33rd International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.251.0123.

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Ohta, Shigemi. "Nucleon Axial Charge from Quenched Lattice QCD with Domain Wall Fermions." In INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 8th Conference CIPANP2003. AIP, 2004. http://dx.doi.org/10.1063/1.1664266.

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Hua, Jiayu, Georg von Hippel, Benjamin Jaeger, Harvey Meyer, Thomas Rae, and Hartmut Wittig. "Fitting strategies to extract the axial charge of the nucleon from lattice QCD." In 31st International Symposium on Lattice Field Theory LATTICE 2013. Trieste, Italy: Sissa Medialab, 2014. http://dx.doi.org/10.22323/1.187.0446.

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Ohta, Shigemi. "Nucleon isovector axial charge in 2+1-flavor domain-wall QCD with physical mass." In The 36th Annual International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.334.0128.

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Goeckeler, Meinulf, Arifa Ali Khan, Philipp Haegler, Thomas Hemmert, Roger Horsley, Alan C. Irving, Dirk Pleiter, et al. "The axial charge of the nucleon on the lattice and in chiral perturbation theory." In XXIIIrd International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2005. http://dx.doi.org/10.22323/1.020.0349.

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Ohta, Shigemi, and Meifeng Lin. "Finite-size scaling in nucleon axial charge from 2+1-flavor DWF lattice QCD." In The 30th International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2012. http://dx.doi.org/10.22323/1.164.0171.

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Rae, Thomas, Benjamin Jaeger, Stefano Capitani, Michele Della Morte, Dalibor Djukanovic, Georg von Hippel, Bastian Knippschild, Harvey Meyer, and Hartmut Wittig. "A high-statistics study of the nucleon EM form factors, axial charge and quark momentum fraction." In 31st International Symposium on Lattice Field Theory LATTICE 2013. Trieste, Italy: Sissa Medialab, 2014. http://dx.doi.org/10.22323/1.187.0272.

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Ohta, Shigemi. "Nucleon axial charge in 2+1-flavor dynamical DWF lattice QCD (for RBC and UKQCD Collaborations)." In 31st International Symposium on Lattice Field Theory LATTICE 2013. Trieste, Italy: Sissa Medialab, 2014. http://dx.doi.org/10.22323/1.187.0274.

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