A Measurement of the Differential Cross Section for the Reaction $\gamma N \to \pi^{-} P$ from Deuterium PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
We report a measurement of the differential cross section for the $\gamma n \to \pi^- p$ process from the CLAS detector at Jefferson Lab in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles ($\theta_{c.m.}$) between 50$^\circ$ and 115$^\circ$. We confirm a previous indication of a broad enhancement around a c.m. energy ($\sqrt{s}$) of 2.2 GeV at $\theta_{c.m.}=90^\circ$ in the scaled differential cross section, $s^7 {\frac{d\sigma}{dt}}$. Our data show the angular dependence of this enhancement as the scaling region is approached in the kinematic region from 70$^\circ$ to 105$^\circ$.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
We report a measurement of the differential cross section for the $\gamma n \to \pi^- p$ process from the CLAS detector at Jefferson Lab in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles ($\theta_{c.m.}$) between 50$^\circ$ and 115$^\circ$. We confirm a previous indication of a broad enhancement around a c.m. energy ($\sqrt{s}$) of 2.2 GeV at $\theta_{c.m.}=90^\circ$ in the scaled differential cross section, $s^7 {\frac{d\sigma}{dt}}$. Our data show the angular dependence of this enhancement as the scaling region is approached in the kinematic region from 70$^\circ$ to 105$^\circ$.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The doubly differential cross sections for the .pi. from the reaction .pi.−p .-->. .pi.pi.−n were measured at about twenty points for each of five energies between 245 MeV and 356 MeV. The experiment was carried out at the Clinton P. Anderson Meson Physics Facility, where a double focusing magnetic spectrometer detected the .pi. mesons produced in a liquid hydrogen target. The measurements were normalized by comparison with .pi.−p elastic scattering measured with the same apparatus. These are the first such measurements in this energy range, and have an accuracy between 4.7% and 39%. The integrated reaction cross section was determined at each energy with an accuracy of about 5%. These agree with but are an improvement over previous measurements in this energy range. Comparison of the extrapolated threshold value of the mean square modulus of the matrix element with the soft pion calculations favors the symmetry breaking mechanism of Weinberg (xi = 0). It also demonstrates the futility of attempting to determine the symmetry breaking parameter xi from a single measurement of the integrated reaction cross section.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
We have measured the differential cross section for the gamma n --> pi- p and gamma p --> pi+ n reactions at center of mass angle of 90 degree in the photon energy range from 1.1 to 5.5 GeV at Jefferson Lab (JLab). The data at photon energies greater than 3.3 GeV exhibit a global scaling behavior for both pi- and pi+ photoproduction, consistent with the constituent counting rule and the existing pi+ photoproduction data. Possible oscillations around the scaling value were observed. The cross section ratio of exclusive pi- to pi+ photoproduction at high energy is consistent with the prediction based on one-hard-gluon-exchange diagrams. The data also indicate a resonance structure at a center-of-mass energy near 2.2 GeV.
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Author: ![A Measurement of the Differential Cross Section for the Photo-production of [pi]− Mesons from Deuterium PDF](https://books.google.com/books/content/images/frontcover/yDMjOAAACAAJ?fife=w80-h100)
Author: David A. Garelick
Author: ![Measurement of the Doubly Differential Cross Section For. Pi. −p. --]. Pi. . Pi. −n Near Threshold PDF](https://books.google.com/books/content/images/frontcover/Pe6fAQAACAAJ?fife=w80-h100)
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Author: United States. Energy Research and Development Administration
Author: ![Measurement of the Reaction [gamma]d ->[pi]−pp and Determination Of Cross Sections for the Reaction [gamma]n-> [pi]−p, at Photon Energies Between 0.2 and 2.0 GeV PDF](https://books.google.com/books/content/images/frontcover/kM3eoQEACAAJ?fife=w80-h100)
Author: P. Benz