Baryon Spin Flavor Structure From An Analysis Of Lattice Qcd Results Of The Baryon Spectrum

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Baryon Spin-flavor Structure from an Analysis of Lattice QCD Results of the Baryon Spectrum

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (94 download)

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Book Synopsis Baryon Spin-flavor Structure from an Analysis of Lattice QCD Results of the Baryon Spectrum by :

Download or read book Baryon Spin-flavor Structure from an Analysis of Lattice QCD Results of the Baryon Spectrum written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The excited baryon masses are analyzed in the framework of the 1/Nc expansion using the available physical masses and also the masses obtained in lattice QCD for different quark masses. The baryon states are organized into irreducible representations of SU(6) x O(3), where the [56,lP=0] ground state and excited baryons, and the [56,2+] and [70}},1-] excited states are analyzed. The analyses are carried out to order O(1/Nc) and first order in the quark masses. The issue of state identifications is discussed. Numerous parameter independent mass relations result at those orders, among them the well known Gell-Mann-Okubo and Equal Spacing relations, as well as additional relations involving baryons with different spins. It is observed that such relations are satisfied at the expected level of precision. The main conclusion of the analysis is that qualitatively the dominant physical effects are similar for the physical and the lattice QCD baryons.

Aspects of Baryon Structure in Lattice QCD

Author : Ronald Babich
Publisher :
ISBN 13 :
Total Pages : 170 pages
Book Rating : 4.:/5 (551 download)

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Book Synopsis Aspects of Baryon Structure in Lattice QCD by : Ronald Babich

Download or read book Aspects of Baryon Structure in Lattice QCD written by Ronald Babich and published by . This book was released on 2009 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Despite the long success of Quantum Chromodynamics (QCD) as the theory of the strong interactions, there remains much to be understood about the structure of hadrons and the consequences of QCD in the nonperturbative regime. Lattice gauge theory, a framework nearly as old as QCD itself, makes calculations in this regime possible, starting from first principles. With advances in theoretical understanding, methods, and computer technology, the lattice has found application to an ever-widening range of problems. In this dissertation, I consider two such problems having to do with the structure of baryons. The first concerns the contribution of sea quarks, and the strange quark in particular, to form factors of the nucleon. This has been a long-standing challenge for the lattice, because such contributions involve the insertion of a current on a quark loop, demanding the full inversion of the discretized Dirac operator, conceptually a large sparse matrix. I discuss methods for addressing this challenge and present a calculation of the strange scalar form factor and the related parameter f Ts . The latter is of great theoretical interest, since it enters into the cross section for the scattering of dark matter off nuclei in supersymmetric extensions of the standard model. As such, it represents a major uncertainty in the interpretation of direct detection experiments. I also present results for the strange quark contribution to the nucleon's axial and electromagnetic form factors, which are themselves the subject of active experimental programs. These calculations were performed using the Wilson fermion formulation on a 24 3 x 64 anisotropic lattice. In the second part of the dissertation, I turn to the valence sector and address the role of diquark correlations in the observed spectrum of hadrons and their properties. A diquark is a correlated pair of quarks, thought to play an important role in certain phenomenological models of hadrons. I present results for baryon wave functions, evaluated in both the Coulomb and Landau gauges. By comparing baryons that differ in their diquark content, I find evidence for enhanced correlation in the scalar diquark channel, as favored by QCD-inspired quark models. I also present results for diquark mass splittings, determined from diquark correlators in the Landau gauge. This second set of calculations was performed with the overlap Dirac operator on quenched gauge configurations at B = 6.

The Nc Dependencies of Baryon Masses

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis The Nc Dependencies of Baryon Masses by :

Download or read book The Nc Dependencies of Baryon Masses written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Baryon masses at varying values of Nc and light quark masses are studied with Lattice QCD and the results are analyzed in a low energy effective theory based on a combined framework of the 1/Nc and Heavy Baryon Chiral Perturbation Theory expansions. Lattice QCD results for Nc=3, 5 and 7 obtained in quenched calculations, as well as results for unquenched calculations for Nc=3, are used for the analysis. The results are consistent with a previous analysis of Nc=3 LQCD results, and in addition permit the determination of sub-leading in 1/Nc effects in the spin-flavor singlet component of the baryon masses as well as in the hyperfine splittings.

Baryons 2002

Author : Carl Carlson
Publisher : World Scientific
ISBN 13 : 9789812704887
Total Pages : 712 pages
Book Rating : 4.7/5 (48 download)

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Book Synopsis Baryons 2002 by : Carl Carlson

Download or read book Baryons 2002 written by Carl Carlson and published by World Scientific. This book was released on 2003 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the latest developments in the area of three-quark systems. Emphasis is given to the discussion of new experimental results in the areas of form factors, unpolarized and polarized structure functions, and baryon structure and spectroscopy. Of particular interest are the new theoretical developments in the area of generalized parton distributions and lattice quantum chromodynamics.

Baryons '92 - International Conference On The Structure Of Baryons And Related Mesons

Author : Moshe Gai
Publisher : World Scientific
ISBN 13 : 9814554219
Total Pages : 506 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Baryons '92 - International Conference On The Structure Of Baryons And Related Mesons by : Moshe Gai

Download or read book Baryons '92 - International Conference On The Structure Of Baryons And Related Mesons written by Moshe Gai and published by World Scientific. This book was released on 1993-03-24 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers major themes in the spectroscopy of baryons, some light mesons, and involves some limited discussion of baryons in nuclei. A comprehensive review of theoretical models is included. All currently operating accelerator facilities and future facilities of the 1990s are reviewed, with experimental programs discussed in detail.

Cascade Baryon Spectrum from Lattice QCD.

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Cascade Baryon Spectrum from Lattice QCD. by :

Download or read book Cascade Baryon Spectrum from Lattice QCD. written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive study of the cascade baryon spectrum using lattice QCD affords the prospect of predicting the masses of states not yet discovered experimentally, and determining the spin and parity of those states for which the quantum numbers are not yet known. The study of the cascades, containing two strange quarks, is particularly attractive for lattice QCD in that the chiral effects are reduced compared to states composed only of u/d quarks, and the states are typically narrow. We report preliminary results for the cascade spectrum obtained by using anisotropic Nf = 2 Wilson lattices with temporal lattice spacing 5.56 GeV?1.

Baryon Spectroscopy and Resonances

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Baryon Spectroscopy and Resonances by :

Download or read book Baryon Spectroscopy and Resonances written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A short review of current efforts to determine the highly excited state spectrum of QCD, and in particular baryons, using lattice QCD techniques is presented. The determination of the highly excited spectrum of QCD is a major theoretical and experimental challenge. The experimental investigation of the excited baryon spectrum has been a long-standing element of the hadronic-physics program, an important component of which is the search for so-called 'missing resonances', baryonic states predicted by the quark model based on three constituent quarks but which have not yet been observed experimentally. Should such states not be found, it may indicate that the baryon spectrum can be modeled with fewer effective degrees of freedom, such as in quark-diquark models. In the past decade, there has been an extensive program to collect data on electromagnetic production of one and two mesons at Jefferson Lab, MIT-Bates, LEGS, MAMI, ELSA, and GRAAL. To analyze these data, and thereby refine our knowledge of the baryon spectrum, a variety of physics analysis models have been developed at Bonn, George Washington University, Jefferson Laboratory and Mainz. To provide a theoretical determination and interpretation of the spectrum, ab initio computations within lattice QCD have been used. Historically, the calculation of the masses of the lowest-lying states, for both baryons and mesons, has been a benchmark calculation of this discretized, finite-volume computational approach, where the aim is well-understood control over the various systematic errors that enter into a calculation; for a recent review. However, there is now increasing effort aimed at calculating the excited states of the theory, with several groups presenting investigations of the low-lying excited baryon spectrum, using a variety of discretizations, numbers of quark flavors, interpolating operators, and fitting methodologies. Some aspects of these calculations remain unresolved and are the subject of intense effort, notably the ordering of the Roper resonance in the low-lying Nucleon spectrum.

A Phenomenological Study of Quark Structure of Baryons

Author : Neetika Sharma
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783846538616
Total Pages : 156 pages
Book Rating : 4.5/5 (386 download)

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Book Synopsis A Phenomenological Study of Quark Structure of Baryons by : Neetika Sharma

Download or read book A Phenomenological Study of Quark Structure of Baryons written by Neetika Sharma and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of internal structure of baryons is considered as one of the active areas in hadronic physics as it provides valuable insight into the nonperturbative aspects of QCD. The structure of baryons at low energies is probed through the spin and flavor dynamics of quarks. In low energy regime, Chiral constituent quark model with spin-spin generated configuration mixing successfully explains the spin and flavor structure of baryons. The application of this model has been extended to study the various low energy hadronic matrix elements having implications for the flavor and spin dynamics. In particular, a satisfactory fit is obtained for the quark and antiquark flavor distribution functions, magnetic moments, charge radii, quadrupole moments, weak vector and axial-vector form factors, etc.. We have found a good overall agreement with experimental data as well as with other phenomenological models. The results can perhaps be substantiated by a measurement of the these observables by the future experiments.

Lattice Studies of Baryons

Author : David Richards
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Lattice Studies of Baryons by : David Richards

Download or read book Lattice Studies of Baryons written by David Richards and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This talk describes progress at understanding the properties of the nucleon and its excitations from lattice QCD. I begin with a review of recent lattice results for the lowest-lying states of the excited baryon spectrum. The need to approach physical values of the light quark masses is emphasized, enabling the effects of the pion cloud to be revealed. I then outline the development of techniques that will enable the extraction of the masses of the higher resonances, and describe how such calculations provide insight into the structure of the hadrons. Finally, I discuss direct probes of the quark and gluon structure of baryons through the lattice measurement of the moments of quark distributions and of Generalized Parton Distributions.

Lattice Hadron Physics

Author : Alex Kalloniatis
Publisher : Springer Science & Business Media
ISBN 13 : 9783540239116
Total Pages : 252 pages
Book Rating : 4.2/5 (391 download)

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Book Synopsis Lattice Hadron Physics by : Alex Kalloniatis

Download or read book Lattice Hadron Physics written by Alex Kalloniatis and published by Springer Science & Business Media. This book was released on 2005-05-20 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lattice Hadron Physics draws upon the developments made in recent years in implementing chirality on the lattice via the overlap formalism. These developments exploit chiral effective field theory in order to extrapolate lattice results to physical quark masses, new forms of improving operators to remove lattice artefacts, analytical studies of finite-volume effects in hadronic observables, and state-of-the-art lattice calculations of excited resonances. This volume, comprised of selected lectures, is designed to assist those outside the field who want quickly to become literate in these topics. As such, it provides graduate students and experienced researchers in other areas of hadronic physics with the background through which they can appreciate, if not become active in, contemporary lattice-gauge theory and its applications to hadronic phenomena.

Baryons '92 - International Conference on the Structure of Baryons and Related Mesons

Author : Moshe Gai
Publisher :
ISBN 13 : 9789814536950
Total Pages : 506 pages
Book Rating : 4.5/5 (369 download)

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Book Synopsis Baryons '92 - International Conference on the Structure of Baryons and Related Mesons by : Moshe Gai

Download or read book Baryons '92 - International Conference on the Structure of Baryons and Related Mesons written by Moshe Gai and published by . This book was released on 1993 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Lattice Study of the Scalar and Baryon Spectrum in Many-flavor QCD.

Author :
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (94 download)

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Book Synopsis Lattice Study of the Scalar and Baryon Spectrum in Many-flavor QCD. by :

Download or read book Lattice Study of the Scalar and Baryon Spectrum in Many-flavor QCD. written by and published by . This book was released on 2015 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Spectroscopy of Doubly Charmed Baryons from Lattice QCD.

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (94 download)

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Book Synopsis Spectroscopy of Doubly Charmed Baryons from Lattice QCD. by :

Download or read book Spectroscopy of Doubly Charmed Baryons from Lattice QCD. written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study presents the ground and excited state spectra of doubly charmed baryons from lattice QCD with dynamical quark fields. Calculations are performed on anisotropic lattices of size 163 × 128, with inverse spacing in temporal direction at−1=5.67(4) GeV and with a pion mass of about 390 MeV. A large set of baryonic operators that respect the symmetries of the lattice yet which retain a memory of their continuum analogues are used. These operators transform as irreducible representations of SU(3)F symmetry for flavor, SU(4) symmetry for Dirac spins of quarks and O(3) for spatial symmetry. The distillation method is utilized to generate baryon correlation functions which are analyzed using the variational fitting method to extract excited states. The lattice spectra obtained have baryonic states with well-defined total spins up to 7/2 and the pattern of low-lying states does not support the diquark picture for doubly charmed baryons. On the contrary the calculated spectra are remarkably similar to the expectations from models with an SU(6)×O(3) symmetry. Various spin-dependent energy splittings between the extracted states are also evaluated.

Baryon Spectroscopy and Operator Construction in Lattice QCD.

Author : R. Edwards
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Baryon Spectroscopy and Operator Construction in Lattice QCD. by : R. Edwards

Download or read book Baryon Spectroscopy and Operator Construction in Lattice QCD. written by R. Edwards and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This talk describes progress at understanding the properties of the nucleon and its excitations from lattice QCD. I begin with a review of recent lattice results for the lowest-lying states of the excited baryon spectrum. The need to approach physical values of the light quark masses is emphasized, enabling the effects of the pion cloud to be revealed. I then outline the development of techniques that will enable the extraction of the masses of the higher resonances. I will describe how such calculations provide insight into the structure of the hadrons, and enable comparison both with experiment, and with QCD-inspired pictures of hadron structure, such as calculations in the limit of large N{sub c}.

Baryons '95 - Proceedings Of The 7th International Conference On The Structure Of Baryons

Author : Benjamin F Gibson
Publisher : World Scientific
ISBN 13 : 9814547670
Total Pages : 614 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Baryons '95 - Proceedings Of The 7th International Conference On The Structure Of Baryons by : Benjamin F Gibson

Download or read book Baryons '95 - Proceedings Of The 7th International Conference On The Structure Of Baryons written by Benjamin F Gibson and published by World Scientific. This book was released on 1996-09-20 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conference focused on the current status of baryon spectroscopy, form factors and structure functions, electroweak interactions and symmetries, strange and exotic states, chiral perturbation theory, heavy quark physics, and medium modifications, through plenary session summaries and reviews and parallel session reports of recent experimental and theoretical advances. Plans for future facilities and upgrades were highlighted in special plenary sessions.

Mesons and Baryons

Author : A. V. Anisovich
Publisher : World Scientific
ISBN 13 : 9812818251
Total Pages : 603 pages
Book Rating : 4.8/5 (128 download)

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Book Synopsis Mesons and Baryons by : A. V. Anisovich

Download or read book Mesons and Baryons written by A. V. Anisovich and published by World Scientific. This book was released on 2008 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to the investigation of the strongly interacting hadrons ? to a quark model operating with effective color particles, constituent quarks, massive effective gluons and diquarks. The study of strong interactions based on effective constituent particles requires a solid ground of experimental data, which we now have at our disposal with the serious progress made in the investigation of hadrons, especially meson states.The present understanding of QCD applied to strong interactions can be distorted by prejudices. Therefore, the way followed by the quark model is to rely on the experiment and to restore the effective Hamiltonian on the basis of QCD on the one hand, and, on the other, of the spectral integral method.Baryon-baryon and antibaryon-baryon interactions are studied with the purpose of unambiguous applications of the written formulae to the interpretation of experimental data ? to the observation of new meson and baryon resonances. The technique used is the spin-orbital momentum expansion of the amplitude. This method is our basic approach to the proper treatment of experimental data. The photon-induced reactions are also considered and the problem of form factors is discussed.

Excited Baryon Spectrum from Lattice QCD.

Author : Frank Lee
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Excited Baryon Spectrum from Lattice QCD. by : Frank Lee

Download or read book Excited Baryon Spectrum from Lattice QCD. written by Frank Lee and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report lattice calculations of the low-lying baryon mass spectrum, with an emphasis on the introduction of two new techniques. One is the constrained fitting method based on Bayesian statistics which allows reliable extraction of excited states. The other is the use of the overlap fermion action which preserves exact chiral symmetry of QCD on the lattice and allows us to reach deep down into the chiral regime (our pion mass is as low as 180 MeV) where interesting chiral dynamics are exposed. One example is the elusive Roper state N(1440)1/2+ which shows up naturally as the 1st-excited state of the nucleon from the standard interpolating field. Together with other baryons, our preliminary results indicate that the level-ordering of the low-lying baryon states on the lattice is largely consistent with experiment and with that expected from meson-exchange quark models.