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Measurements Of Threshold Pi Electroproduction At Low Momentum Transfer
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Book Synopsis Measurements of Threshold Pi + Electroproduction at Low Momentum Transfer by : A. DelGuerra
Download or read book Measurements of Threshold Pi + Electroproduction at Low Momentum Transfer written by A. DelGuerra and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Threshold Pi + Electroproduction at High Momentum Transfer by : A. DelGuerra
Download or read book Threshold Pi + Electroproduction at High Momentum Transfer written by A. DelGuerra and published by . This book was released on 1976 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Measurement of Electroproduction of Pi0 Near Threshold by :
Download or read book Precision Measurement of Electroproduction of Pi0 Near Threshold written by and published by . This book was released on 2012 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Precision Measurements of Neutral Pion Electroproduction Near Threshold by :
Download or read book Precision Measurements of Neutral Pion Electroproduction Near Threshold written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976-05 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Measurement of the P(e, Ép) ?0 Reaction at Threshold by :
Download or read book Precision Measurement of the P(e, Ép) ?0 Reaction at Threshold written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: New results are reported from a measurement of $\pi0̂$ electroproduction near threshold using the p(e, ép) ?0 reaction. The experiment was designed to determine precisely the energy dependence of $s-$ and $p-$wave electromagnetic multipoles as a stringent test of the predictions of Chiral Perturbation Theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the $\phi*̂_{\pi}$ and $\theta*̂_{\pi}$ angles in the $p \pi0̂$ center-of-mass was obtained for invariant energies above threshold from 0.5 MeV up to 15 MeV. The 4-momentum transfer $Q2̂$ coverage ranges from 0.05 to 0.155 (GeV/c)$2̂$ in fine steps. A simple phenomenological analysis of our data shows strong disagreement with $p-$wave predictions from ChPT for $Q2̂>0.07$ (GeV/c)$2̂$, while the $s-$wave predictions are in reasonable agreement.
Book Synopsis Precision Measurement of Electroproduction of [pi]0 Near Threshold by : Khem Chirapatpimol
Download or read book Precision Measurement of Electroproduction of [pi]0 Near Threshold written by Khem Chirapatpimol and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the N --] Delta^+ (1232) Transition at High-Momentum Transfer by Pi^0 Electroproduction by :
Download or read book Measurement of the N --] Delta^+ (1232) Transition at High-Momentum Transfer by Pi^0 Electroproduction written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a new measurement of the exclusive electroproduction reaction gamma*_p --> pi0_p to explore the evolution from soft nonperturbative physics to hard processes via the Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the N --> Delta transition. 9000 differential cross section data points cover W from threshold to 1.4 GeV/c2, 4pi center-of-mass solid angle, and Q2 from 3 to 6 GeV2/c2, the highest yet achieved. It is found that the magnetic form factor G^*M decreases with Q2 more steeply than the proton magnetic form factor, the ratio E1+/M1+ is small and negative, indicating strong helicity nonconservation, and the ratio S1+/M1+ is negative, while its magnitude increases with Q2.
Book Synopsis A Measurement of Pi 0 Electroproduction on Hydrogen Near Threshold by : D. R. Botterill
Download or read book A Measurement of Pi 0 Electroproduction on Hydrogen Near Threshold written by D. R. Botterill and published by . This book was released on 1973 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1983 with total page 1408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Double Spin Asymmetry in {pi}{sup +} Electroproduction with CLAS. by :
Download or read book Measurement of the Double Spin Asymmetry in {pi}{sup +} Electroproduction with CLAS. written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present thesis describes the measurement of the double spin asymmetry in the ep 2!e[pi]n reaction. This represents the only existing measurement for this observable. The reaction is identified detecting the scattered electron and the emitted pion and using the missing mass technique to identify the neutron. The asymmetry is evaluated as a function of the four-momentum transfer Q2, the invariant mass W and the pion center of mass angle [theta]*. These are in fact the variables that determine the transition amplitudes for the process. The W range of this measurement varies from the pion threshold to a maximum value of 1.8 GeV, exploring the full resonance region. The results obtained with this analysis in the evaluation of the spin asymmetry are presented. The outline of the thesis can be summarized as follows. The first chapter describes the physics motivation that are at the basis of this experiment. The second and third chapters illustrate the design of the CLAS detector and the polarized target. The fourth chapter gives a description of the event reconstruction and to the event selection while the analysis procedure is described in chapter five. Chapter six discusses the results of this measurement, including the evaluation of the systematic uncertainty and the comparison with a physics model.
Book Synopsis Pi Electroproduction at the Delta (1236) Resonance at a Four-momentum Transfer of Q 2 by : Ulrich Beck
Download or read book Pi Electroproduction at the Delta (1236) Resonance at a Four-momentum Transfer of Q 2 written by Ulrich Beck and published by . This book was released on 1974 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Soviet Journal of Nuclear Physics by :
Download or read book Soviet Journal of Nuclear Physics written by and published by . This book was released on 1982 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Energy Physics Index written by and published by . This book was released on 1991 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1980 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the International Symposium on Electron and Photon Interactions at High Energies by :
Download or read book Proceedings of the International Symposium on Electron and Photon Interactions at High Energies written by and published by . This book was released on 1972 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: