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Valence Quark Contributions For The Gamma N P111440 Form Factors
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Book Synopsis Valence Quark Contributions for the Gamma N -] P11(1440) Form Factors by :
Download or read book Valence Quark Contributions for the Gamma N -] P11(1440) Form Factors written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a covariant spectator quark model we estimate valence quark contributions to the F_1*(Q2) and F2*(Q2) transition form factors for the gamma N -> P11(1440) reaction. The Roper resonance, P11(1440), is assumed to be the first radial excitation of the nucleon. The present model requires no extra parameters except for those already fixed by the previous studies for the nucleon. Our results are consistent with the experimental data in the high Q2 region, and those from lattice QCD. We also estimate the meson cloud contributions, focusing on the low Q2 region, where they are expected to be dominant.
Book Synopsis Valence Quark Contributions for the Gamma N -] P11(1440) Transition by :
Download or read book Valence Quark Contributions for the Gamma N -] P11(1440) Transition written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A covariant spectator quark model is applied to estimate the valence quark contributions to the$ F1*(Q2) and F2*(Q2) transition form factors for the gamma N -> P11(1440) reaction. The Roper resonance, P11(1440), is assumed to be the first radial excitation of the nucleon. The model requires no extra parameters except for those already fixed by the previous studies for the nucleon. The results are consistent with the experimental data in the high Q2 region, and those from the lattice QCD. Finally the model is also applied to estimate the meson cloud contributions from the CLAS and MAID analysis.
Book Synopsis Valence Quark Contribution for the Gamma N -] Delta Quadrupole Transition Extracted from Lattice QCD. by :
Download or read book Valence Quark Contribution for the Gamma N -] Delta Quadrupole Transition Extracted from Lattice QCD. written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting with a spectator quark model developed for the nucleon (N) and the Delta in the physical pion mass region, we extend the predictions of the reaction gamma N -> Delta to the lattice QCD regime. The quark model includes S and D waves in the quark-diquark wavefunctions. Within this framework it is the D-wave part in the Delta wavefunction that generates nonzero valence contributions for the quadrupole form factors of the transition. Those contributions are however insufficient to explain the physical data, since the pion cloud contributions dominate. To separate the two effects we apply the model to the lattice regime in a region where the pion cloud effects are negligible, and adjust the D-state parameters directly to the lattice data. This process allows us to obtain a better determination of the D-state contributions. Finally, by adding a simple parametrization of the pion cloud we establish the connection between the experimental data and the lattice da.
Book Synopsis A Covariant Formalism for the N* Electroproduction at High Momentum Transfer by :
Download or read book A Covariant Formalism for the N* Electroproduction at High Momentum Transfer written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A constituent quark model based on the spectator formalism is applied to the gamma N -> N* transition for the three cases, where N* is the nucleon, the Delta and the Roper resonance. The model is covariant, and therefore can be used for the predictions at higher four-momentum transfer squared, Q2. The baryons are described as an off-mass-shell quark and a spectator on-mass-shell diquark systems. The quark electromagnetic current is described by quark form factors, which have a form inspired by the vector meson dominance. The valence quark contributions of the model are calibrated by lattice QCD simulations and experimental data. Contributions of the meson cloud to the inelastic processes are explicitly included.
Book Synopsis Light Cone Sum Rules for Gamma*N -]Delta Transition Form Factors by :
Download or read book Light Cone Sum Rules for Gamma*N -]Delta Transition Form Factors written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical framework is suggested for the calculation of [gamma]* N → [Delta] transition form factors using the light-cone sum rule approach. Leading-order sum rules are derived and compared with the existing experimental data. We find that the transition form factors in a several GeV region are dominated by the ''soft'' contributions that can be thought of as overlap integrals of the valence components of the hadron wave functions. The ''minus'' components of the quark fields contribute significantly to the result, which can be reinterpreted as large contributions of the quark orbital angular momentum.
Book Synopsis Nucleon and Gamma N -] Delta Lattice Form Factors in a Constituent Quark Model by :
Download or read book Nucleon and Gamma N -] Delta Lattice Form Factors in a Constituent Quark Model written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A covariant quark model, based both on the spectator formalism and on Vector Meson Dominance, and previously calibrated by the physical data, is here extended to the unphysical region of the lattice data by means of one single extra adjustable parameter - the constituent quark mass in the chiral limit. We calculated the Nucleon (N) and the Gamma N -> Delta form factors in the universe of values for that parameter described by quenched lattice QCD. A qualitative description of the Nucleon and Gamma N -> Delta form factors lattice data is achieved for light pion masses.
Book Synopsis Octet Baryon Electromagnetic Form Factors in a Relativistic Quark Model by :
Download or read book Octet Baryon Electromagnetic Form Factors in a Relativistic Quark Model written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We study the octet baryon electromagnetic properties by applying the covariant spectator quark model, and provide covariant parametrization that can be used to study baryon electromagnetic reactions. While we use the lattice QCD data in the large pion mass regime (small pion cloud effects) to determine the parameters of the model in the valence quark sector, we use the nucleon physical and octet baryon magnetic moment data to parameterize the pion cloud contributions. The valence quark contributions for the octet baryon electromagnetic form factors are estimated by extrapolating the lattice parametrization in the large pion mass regime to the physical regime. As for the pion cloud contributions, we parameterize them in a covariant, phenomenological manner, combined with SU(3) symmetry. We also discuss the impact of the pion cloud effects on the octet baryon electromagnetic form factors and their radii.
Book Synopsis Physics and Astrophysics of Neutrinos by : Masataka Fukugita
Download or read book Physics and Astrophysics of Neutrinos written by Masataka Fukugita and published by Springer Science & Business Media. This book was released on 2013-12-14 with total page 947 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observations of neutrinos being emitted by the supernova SN1987A, star neutrinos, and atmospheric neutrinos have provided new insights into astronomy, as well as new unresolved phenomena such as the solar neutrino problem, spurring investigative studies among particle physicists and astrophysicists. One of the most important features of this book is its enumeration of a number of basic properties of neutrinos and their relationship to Grand Unified Theories, focusing on the origin of the neutrino's mass and the generation mixing of neutrinos. All the kamiokande results, detector performances, and complete references are included.
Book Synopsis Chiral Soliton Models for Baryons by : Herbert Weigel
Download or read book Chiral Soliton Models for Baryons written by Herbert Weigel and published by Springer. This book was released on 2007-11-28 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: This concise research monograph introduces and reviews the concept of chiral soliton models for baryons. In these models, baryons emerge as (topological) defects of the chiral field. The many applications shed light on a number of bayron properties, ranging from static properties via nuclear resonances to even heavy ion collisions. This volume also features a number of appendices to help nonspecialist readers to follow in more detail some of the calculations in the main text.
Book Synopsis Pion-Electroproduction by : Edoardo Amaldi
Download or read book Pion-Electroproduction written by Edoardo Amaldi and published by Springer. This book was released on 2006-04-11 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chiral Solitons written by Keh-fei Liu and published by World Scientific. This book was released on 1987-04-01 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: This review volume on topological and nontopological chiral solitons presents a global view on the current developments of this field in particle and nuclear physics. The book addresses problems in quantization, restoration of translational and rotational symmetry, and the field theoretical approach to solitons which are common problems in the field of solitons. Primarily aimed for graduate students and the novice in the field, the collected articless cover a broad spectrum of topics in formalism as well as phenomenology.
Book Synopsis Hadron Physics by : I.J. Douglas MacGregor
Download or read book Hadron Physics written by I.J. Douglas MacGregor and published by CRC Press. This book was released on 2006-07-07 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Straddling the traditional disciplines of nuclear and particle physics, hadron physics is a vital and extremely active research area, as evidenced by a 2004 Nobel prize and new research facilities, such as that scheduled to open at CERN. Scientifically it is of vital importance in extrapolating our knowledge of quark-gluon physics at the sub-nucleon level to provide a wider perspective of strongly interacting hadrons, which make up the vast bulk of known matter in the Universe. Through detailed, pedagogical chapters contributed by key international experts, Hadron Physics maps out our contemporary knowledge of the subject. It covers both the theoretical and experimental aspects of hadron structure and properties along with a wide range of specific research topics, results, and applications. Providing a full picture of activity in the field, the book highlights three particular areas of current research: computational lattice hadron physics, the structure and dynamics of hadrons, and generalized parton distributions. It provides a solid introduction, includes background theory, and presents the current state of understanding of the subject.
Book Synopsis Dynamics of the Standard Model by : John F. Donoghue
Download or read book Dynamics of the Standard Model written by John F. Donoghue and published by Cambridge University Press. This book was released on 2023-01-31 with total page 599 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2014 edition, now OA, provides a detailed and practical account of the Standard Model of particle physics.
Book Synopsis Lattice Gauge Theories: An Introduction by : Heinz J Rothe
Download or read book Lattice Gauge Theories: An Introduction written by Heinz J Rothe and published by World Scientific. This book was released on 1992-01-29 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces a large number of topics in lattice gauge theories, including analytical as well as numerical methods. It provides young physicists with the theoretical background and basic computational tools in order to be able to follow the extensive literature on the subject, and to carry out research on their own. Whenever possible, the basic ideas and technical inputs are demonstrated in simple examples, so as to avoid diverting the readers' attention from the main line of thought. Sufficient technical details are however given so that he can fill in the remaining details with the help of the cited literature without too much effort.This volume is designed for graduate students in theoretical elementary particle physics or statistical mechanics with a basic knowledge in Quantum Field Theory.
Book Synopsis Asymptotic Realms of Physics by : Francis Eugene Low
Download or read book Asymptotic Realms of Physics written by Francis Eugene Low and published by MIT Press (MA). This book was released on 1983 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first few months of the universe, the MIT bag model, and grand unified theories are among the chief concerns of these essays and articles honoring MIT theoretical physicist Francis Low. The book opens with a cluster of dedicatory pieces by Murray Gell-Mann, Marvin L. Goldberger, Jeremy Bernstein, and Val L. Fitch. The remainder of the book consists of twenty technical essays by a small galaxy of distinguished scientists: Steven Weinberg; Kenneth A. Johnson; Sidney Drell; Geoffrey F. Chew; Mitchell J. Feigenbaum; Victor F. Weisskopf; Herman Feshbach; Carleton DeTar; John F. Donoghue; D. Danckaert, P. DeCausmaecker, R. Gastmans, W. Troost, and Tai Tsun Wu, writing jointly; Roman Jackiw; William I. Weisberger; Adrian Patrascioiu; Gino Segre; So-Young Î Asim Yildiz; Jogesh C. Pati, Abdus Salam, and J. Strathdee, in another collaborative contribution; and the three editors. Among the other topics are &"Why the Renormalization Group Is a Good Thing&" - the physics of asymptotic freedom - the topological bootstrap &"The Fixed Point of Classical Dynamical Evolution and Chaos&" - compound bags and hadron-hadron interactions - &"Gauge Invariance and Mass&" - Gribov ambiguities - &"The Simple Facts about the Baryon Asymmetry of the Universe&" - preons and supersymmetry - some speculations on the origin of the matter, energy, and entropy of the universe - the Chew-Low theory and the quark model - &"From Gell-Mann-Low to Unification.&" The editors are all affiliated with the Center for Theoretical Physics at MIT.
Book Synopsis An Introduction to Quarks and Partons by : F. E. Close
Download or read book An Introduction to Quarks and Partons written by F. E. Close and published by . This book was released on 1979 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mesons in Nuclei written by and published by . This book was released on 1979 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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