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Charged Pion Photoproduction From Hydrogen And Deuterium At Jefferson Lab
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Book Synopsis Charged Pion Photoproduction from Hydrogen and Deuterium at Jefferson Lab by : Haiyan Gao
Download or read book Charged Pion Photoproduction from Hydrogen and Deuterium at Jefferson Lab written by Haiyan Gao and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The {gamma}n {yields} {pi}{sup -}p and {gamma}p {yields} {pi}{sup +}n reactions are essential probes of the transition from meson-nucleon degrees of freedom to quark-gluon degrees of freedom in exclusive processes. The cross sections of these processes are also, advantageous, for the investigation of oscillatory behavior around the quark counting prediction, since they decrease relatively slower with energy compared with other photon-induced processes. Moreover, these photoreactions in nuclei can probe the QCD nuclear filtering and color transparency effects. In this talk, I discuss the preliminary results on the {gamma}p {yields} {pi}{sup +}n and {gamma}n {yields} {pi}{sup -}p processes at a center-of-mass angle of 90{sup o} from Jefferson Lab experiment E94-104. I also discuss a new experiment in which singles {gamma}p {yields} {pi}{sup +}n measurement from hydrogen, and coincidence {gamma}n {yields} {pi}{sup -}p measurements at the quasifree kinematics from deuterium and {sup 12}C for photon energies between 2.25 GeV to 5.8 GeV in fine steps at a center-of-mass angle of 90{sup o} are planned. The proposed measurement will allow a detailed investigation of the oscillatory scaling behavior in photopion production processes and the study of the nuclear dependence of rather mysterious oscillations with energy that previous experiments have indicated. The various nuclear and perturbative QCD approaches, ranging from Glauber theory, to quark-counting, to Sudakov-corrected independent scattering, make dramatically different predictions for the experimental outcomes.
Book Synopsis Charged Pion Photoproduction from Hydrogen and Deuterium at Jefferson Lab by :
Download or read book Charged Pion Photoproduction from Hydrogen and Deuterium at Jefferson Lab written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The [gamma]n [yields] [pi][sup -]p and [gamma]p [yields] [pi][sup +]n reactions are essential probes of the transition from meson-nucleon degrees of freedom to quark-gluon degrees of freedom in exclusive processes. The cross sections of these processes are also, advantageous, for the investigation of oscillatory behavior around the quark counting prediction, since they decrease relatively slower with energy compared with other photon-induced processes. Moreover, these photoreactions in nuclei can probe the QCD nuclear filtering and color transparency effects. In this talk, I discuss the preliminary results on the [gamma]p [yields] [pi][sup +]n and [gamma]n [yields] [pi][sup -]p processes at a center-of-mass angle of 90[sup o] from Jefferson Lab experiment E94-104. I also discuss a new experiment in which singles [gamma]p [yields] [pi][sup +]n measurement from hydrogen, and coincidence [gamma]n [yields] [pi][sup -]p measurements at the quasifree kinematics from deuterium and [sup 12]C for photon energies between 2.25 GeV to 5.8 GeV in fine steps at a center-of-mass angle of 90[sup o] are planned. The proposed measurement will allow a detailed investigation of the oscillatory scaling behavior in photopion production processes and the study of the nuclear dependence of rather mysterious oscillations with energy that previous experiments have indicated. The various nuclear and perturbative QCD approaches, ranging from Glauber theory, to quark-counting, to Sudakov-corrected independent scattering, make dramatically different predictions for the experimental outcomes.
Book Synopsis Cross Section Measurement of Charged Pion Photoproduction from Hydrogen and Deuterium by :
Download or read book Cross Section Measurement of Charged Pion Photoproduction from Hydrogen and Deuterium written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV. by :
Download or read book Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV. written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of the transition region in the description of exclusive processes and hadron structure, from the nucleon-meson degrees of freedom in meson-exchange models at low energy to the quark-gluon degrees of freedom in pQCD at high energy, is essential for us to understand the strong interaction. The differential cross section measurements for exclusive reactions at fixed center-of-mass angles enable us to investigate the constituent counting rule, which explicitly connects the quark-gluon degrees of freedom to the energy dependence of differential cross sections. JLab Experiment E94-104 was carried out in Hall A with two high resolution spectrometers. It included the coincidence cross section measurement for the [gamma]n --> pi−[p] process with a deuterium target and the singles measurement for the [gamma]p --> pi[n] process with a hydrogen target. The untagged real photons were generated by the electron beam impinging on a copper radiator. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to the center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles were fixed at 50 deg, 70 deg, 90 deg, and also 100 deg, 110 deg at a few energies. The JLab E94-104 data presented in this thesis contain four interesting features. The data exhibit a global scaling behavior for both [pi]− and [pi] photoproduction at high energies and high transverse momenta, consistent with the constituent counting rule and the existing [pi]+ photoproduction data. This implies that the quark-gluon degrees of freedom start to play a role at this energy scale. The data suggests possible substructure of the scaling behavior, which might be oscillations around the scaling value. There are several possible mechanisms that can cause oscillations, for example the one associated with the generalized constituent counting rule involving quark orbital angular momentum. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV, where baryon resonances are not as well known as those at low energies. The differential cross section ratios for exclusive [gamma]n --> pi−[p] to [gamma]p --> pi+[n] process at [theta]{sub cm} = 90 deg start to show consistency with the prediction based on one-hard-gluon-exchange diagrams at high energies.
Book Synopsis Longitudinal Lelectroproduction of Charged Pions on Hydrogen, Deuterium, and Helium 3 by :
Download or read book Longitudinal Lelectroproduction of Charged Pions on Hydrogen, Deuterium, and Helium 3 written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional pictures of nuclear interactions, in which the pion mediates the long/medium range part of the nuclear force, predict an enhancement of the virtual pion cloud in nuclei relative to that in the free nucleon. Jefferson Lab Experiment E91003 measured charged pion electroproduction from Hydrogen, Deuterium, and Helium-3. The longitudinal cross section, which in the limit of pole dominance can be viewed as the quasifree knockout of a virtual pion, was extracted via a Rosenbluth separation. The longitudinal cross sections from Deuterium and Helium-3 were compared to Hydrogen to look for signatures of the nuclear pions.
Download or read book Charged Pion Photoproduction written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We extracted the differential cross section for the gn --> pi-p process from a deuterium target using 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 deg. and 115 deg. We confirm a previous indication of a broad enhancement around a c.m. energy (sqrt s) of 2.1 GeV at theta c.m. =90 deg. in the scaled differential cross section, s^7 ds/dt and a rapid fall-off in a center-of-mass energy region of about 400 MeV following the enhancement. Our data show an angular dependence of this enhancement as the suggested scaling region is approached for theta c.m. from 70 deg. to 10 deg.
Book Synopsis Longitudinal Electroproduction of Charged Pions from Hydrogen, Deuterium, and Helium-3 by : David J. Gaskell
Download or read book Longitudinal Electroproduction of Charged Pions from Hydrogen, Deuterium, and Helium-3 written by David J. Gaskell and published by . This book was released on 2001 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional pictures of nuclear interactions, in which the pion mediates the long/medium range part of the nuclear force, predict an enhancement of the virtual pion cloud in nuclei relative to that in the free nucleon. Jefferson Lab Experiment E91003 measured charged pion electroproduction from Hydrogen, Deuterium, and Helium-3. The longitudinal cross section, which in the limit of pole dominance can be viewed as the quasifree knockout of a virtual pion, was extracted via a Rosenbluth separation. The longitudinal cross sections from Deuterium and Helium-3 were compared to Hydrogen to look for signatures of the nuclear pions.
Book Synopsis Coherent Pion Photoproduction on Deuterium by : Yordanka Ilieva
Download or read book Coherent Pion Photoproduction on Deuterium written by Yordanka Ilieva and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Differential cross sections of the gamma + d -> d + pi{sup 0} reaction were measured at photon beam energies between 0.5 and 2.0 GeV over a wide angular range in CM system. The experiment was performed in Hall B at Jefferson Lab using the CLAS detector. The excitation function, especially at backward CM scattering angles, has been studied with regard to effects due to intermediate on-shell eta and omega rescattering. At CM scattering angles greater than 123 deg our data clearly show an enhancement around 0.7 GeV, which could be attributed to an intermediate on-shell eta-state.
Book Synopsis Physics Division Annual Report by : Argonne National Laboratory. Physics Division
Download or read book Physics Division Annual Report written by Argonne National Laboratory. Physics Division and published by . This book was released on 2001 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV by : Lingyan Zhu
Download or read book Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV written by Lingyan Zhu and published by . This book was released on 2004 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) or example the one associated with the generalized constituent counting rule involving quark orbital angular momentum. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV, where baryon resonances are not as well known as those at low energies. The differential cross section ratios for exclusive ... start to show consistency with the prediction based on one-hard-gluon-exchange diagrams at high energies.
Book Synopsis A Dynamically Polarized Hydrogen and Deuterium Target at Jefferson Lab by : Jim R. Boyce
Download or read book A Dynamically Polarized Hydrogen and Deuterium Target at Jefferson Lab written by Jim R. Boyce and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Refereed and selected contributions from International Conference on Quark Nuclear Physics by : Charlotte Elster
Download or read book Refereed and selected contributions from International Conference on Quark Nuclear Physics written by Charlotte Elster and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Photopion Production from Deuterium Near Threshold by : William Paul Swanson
Download or read book Photopion Production from Deuterium Near Threshold written by William Paul Swanson and published by . This book was released on 1960 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pion Photoproduction on Hydrogen and Deuterium by : Laura S. Wiener
Download or read book Pion Photoproduction on Hydrogen and Deuterium written by Laura S. Wiener and published by . This book was released on 1984 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoproduction of Charged Pion Pairs from Hydrogen at Energies Up to 1500 MeV. by : Lyman Jefferson Fretwell
Download or read book Photoproduction of Charged Pion Pairs from Hydrogen at Energies Up to 1500 MeV. written by Lyman Jefferson Fretwell and published by . This book was released on 1967 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Study of N*(1238) Through the Photoproduction of Charged Pions from Hydrogen and Deuterium by : Richard Alan Singer
Download or read book The Study of N*(1238) Through the Photoproduction of Charged Pions from Hydrogen and Deuterium written by Richard Alan Singer and published by . This book was released on 1967 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Charged Pion Photoproduction And Scaling by :
Download or read book Charged Pion Photoproduction And Scaling written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The gamma-n -->pi- p and gamma-p --> pi+ n reactions are essential probes of the transition from meson-nucleon degrees of freedom to quark-gluon degrees of freedom in exclusive processes. The cross sections of these processes are also advantageous, for the investigation of oscillatory behavior around the quark counting rule prediction, since they decrease relatively slower with energy compared with other photon-induced processes. In this talk, we discuss recent results on the gamma-p --> pi+ n and gamma-n -->pi- p processes from Jefferson Lab experiment E94-104. We also discuss the CLAS g10 analysis on the gamma-n -->pi- p process.
