Threshold Pion Electroproduction In Chiral Perturbation Theory

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Threshold Pion Electroproduction In Chiral Perturbation Theory

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Author :
language : en
Publisher:
Release Date : 1994

Threshold Pion Electroproduction In Chiral Perturbation Theory written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Chirality categories.

Electroproduction Of Pions At Threshold In Chiral Perturbation Theory

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Author :
language : en
Publisher:
Release Date : 1995

Electroproduction Of Pions At Threshold In Chiral Perturbation Theory written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

The electroproduction of pions off protons close to threshold is studied within the framework of baryon chiral perturbation theory. The approach is based on the fundamental QCD property that at low energies the strong interactions are dictated by the spontaneously broken chiral symmetry. The calculation was done up to the 1-loop level by carrying out order-by-order renormalization procedures. A thorough study of the low-energy theorems related to electroproduction of pions was carried out. Our study showed how the axial radius of the nucleon can be related to the S-wave multipoles E{sub 0+}{sup ( - )} and L{sub 0+}{sup ( - )}.

Precision Measurements Of Neutral Pion Electroproduction Near Threshold

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Author :
language : en
Publisher:
Release Date : 2013

Precision Measurements Of Neutral Pion Electroproduction Near Threshold written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Preliminary results are presented from an experiment to measure [pi]° electroproduction at and above threshold using the p(e;e' p)[pi]° reaction. The data were taken at a beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time in [pi]° threshold electroproduction, complete coverage of the [phi]{sub [pi]}* and [theta]{sub [pi]}* angles in the center-of-mass (C.M.) was obtained for the invariant mass region up to [Delta]W=18 MeV above the [pi]° threshold. At the same time our invariant momentum transfer squared covers the range Q2 = 0.05-0.15 (GeV/c)2 with twelve bins in Q2. The improved kinematic coverage in C.M., W and Q2 will better constrain theoretical interpretations of the data using phenomenological models and QCD-inspired models such as Heavy Baryon Chiral Perturbation Theory.

Neutral Pion Electroproduction Off Light Nuclei In Chiral Perturbation Theory

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Author : Mark Lenkewitz
language : en
Publisher:
Release Date : 2013

Neutral Pion Electroproduction Off Light Nuclei In Chiral Perturbation Theory written by Mark Lenkewitz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Precision Measurement Of Electroproduction Of Pi0 Near Threshold

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Author :
language : en
Publisher:
Release Date : 2012

Precision Measurement Of Electroproduction Of Pi0 Near Threshold written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.

Electromagnetic production of neutral pions near threshold is the most basic, lowest energy reaction in which a new hadron is created. The electromagnetic interaction is well understood so measurements of this reaction can yield direct insight into the hadronic production mechanism. During the past three decades there have been many developments in both the measurement and theory of threshold pion production, starting with measurements of photo-production at Saclay in 1986 and at Mainz in 1990. These measurements indicated a surprising discrepancy with so-called Low Energy Theorems (LETs) which are based on quite fundamental symmetries and considerations. Chiral Perturbation Theory (ChPT) is an effective field theoretic description of the nuclear force which contains the underlying symmetries of the force but deals with nucleons and pions rather than quarks and gluons. It has the advantage of being applicable at low energies but requires tuning some parameters to experimental data. Once these parameters have been determined ChPT predicts how the reaction should behave as a function of the kinematic variable. When applied to the reaction, p([gamma], [pi]0)p, near threshold it explained the discrepancy with the LETs and made predictions for electroproduction, p(e, e'p)[pi] 0. Electroproduction measurements at Mainz in the 1990's showed a clear discrepancy with these predictions of ChPT; with parameters determined from one set of kinematics the data for a second set lay far from the predicted value. However, recently completed measurements at Mainz disagreed with their previous measurements. In the experiment presented here, measurements of neutral pion electroproduction, p(e, e'p)[pi]0, were made in bins of momentum transfer, Q2, between Q2 = 0.05 [GeV/c]2 and Q2 = 0.15 [GeV/c]0 and of center-of-mass energy, W, between 0 d"W d"30 MeV (above threshold). The experiment was performed in Hall A at the Jefferson Laboratory. Scattered electrons were detected in one of the two High Resolution Spectrometers while the recoiling protons were detected in the BigBite spectrometer. The results of the present experiment agree within uncertainties with the recent Mainz measurements and extend in W significantly beyond those measurements. The present data show significant disagreement with some terms in the cross section above Q2 ~ 0.10 [GeV/c]2. For W e"5 MeV the disagreement is very strong and consistent. Whether fitting new ChPT parameters to the recent data or adding more terms to the calculations would improve the agreement remains to be seen.

Chiral Dynamics Theory And Experiment Iii

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Author : Aron M Bernstein
language : en
Publisher: World Scientific
Release Date : 2001-12-04

Chiral Dynamics Theory And Experiment Iii written by Aron M Bernstein and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-12-04 with Science categories.

This book provides an authoritative, up to date, overview of the field of chiral dynamics, and also provides an excellent introduction to the field. The workshop is known for the interplay of theory and experiment and as a meeting place for most of the leading researchers in the field.

A Primer For Chiral Perturbation Theory

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Author : Stefan Scherer
language : en
Publisher: Springer
Release Date : 2011-10-01

A Primer For Chiral Perturbation Theory written by Stefan Scherer and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-10-01 with Science categories.

Chiral Perturbation Theory, as effective field theory, is a commonly accepted and well established working tool, approximating quantum chromodynamics at energies well below typical hadron masses. This volume, based on a number of lectures and supplemented with additional material, provides a pedagogical introduction for graduate students and newcomers entering the field from related areas of nuclear and particle physics. Starting with the the Lagrangian of the strong interactions and general symmetry principles, the basic concepts of Chiral Perturbation Theory in the mesonic and baryonic sectors are developed. The application of these concepts is then illustrated with a number of examples. A large number of exercises (81, with complete solutions) are included to familiarize the reader with helpful calculational techniques.

Meson 2002 Proceedings Of The 7th International Workshop On Production Properties And Interaction Of Mesons

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Author : Carlo Guaraldo
language : en
Publisher: World Scientific
Release Date : 2003-01-15

Meson 2002 Proceedings Of The 7th International Workshop On Production Properties And Interaction Of Mesons written by Carlo Guaraldo and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-01-15 with Science categories.

This volume deals with both the experimental and theoretical aspects of meson physics; in particular, it presents new results. The main topics are: hadronic and electromagnetic meson production in various reactions; meson interaction with mesons, nucleons and nuclei; the structure of hadrons; mesons and fundamental symmetries; exotic systems. The book provides an overview of the current status of these areas, as well as of new developments, besides giving a preview of the forthcoming investigations.

Refereed And Selected Contributions From International Conference On Quark Nuclear Physics

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Author : Charlotte Elster
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29

Refereed And Selected Contributions From International Conference On Quark Nuclear Physics written by Charlotte Elster and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Science categories.

This volume contains the refereed and selected contributions from the International Conference on Quark Nuclear Physics (QNP2002), held from 9 to 14 June 2002 in Jülich, Germany.

Chiral Dynamics Theory And Experiment

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Author : Aron M. Bernstein
language : en
Publisher: Springer
Release Date : 1995-07-24

Chiral Dynamics Theory And Experiment written by Aron M. Bernstein and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-07-24 with Computers categories.

Chiral dynamics provides a rigorous and model-independent methodology for making QCD predictions at the confinement scale. This helps particularly in the testing of the standard model. The workshop reported here was focused on theoretical predictions and the measurements of physical processes, analyzing carefully the phenomenology needed to bridge the gap between the two. Besides the lectures, this volume also contains summaries of the working groups on Â-Â-scattering, ÂN-interaction, photo/electro-pion-production, and on chiral anomaly. This book is a thorough review of the state of the art and it addresses researchers as well as graduate students.