Download or read book Measurement of Differential Cross Sections and Spin Density Matrix Elements Along with a Partial Wave Analysis for Gamma P p Omega Using CLAS at Jefferson Lab written by Mike Williams and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Differential Cross Sections and Spin Density Matrix Elements Along with a Partial Wave Analysis for Gamma P P Omega Using CLAS at JLab written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents measurements of differential cross sections, do/d cos$wCM, and spin density matrix elements, PsMM', for the reaction ypâ pw in the energy range 1.72 GeV
Download or read book Measurements of Yp arrow Sign pn Differential Cross Sections and gamma rho arrow Sign gamma omega Differential Cross Sections and Spin Density Matrix Elements gamma 0 gamma 3 Using CLAS at Jefferson Lab written by Tianqi Hu and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Meson photoproduction off the nucleon has long been serving as a tool for understanding the properties of hadrons. At lower energy scales, the production mechanisms are dominated by the $s$-channel inelastic scattering process, where the proton absorbs the photon, gets excited to the resonance state, and then decays. Nucleon resonances have been extensively studied in this energy regime using techniques such as partial wave analysis. When the energy scale increases, the production mechanism gradually transitions from the formation of nucleon resonances to the pure scattering process, corresponding to the $t$- and $u$-channel exchange. However, the scarcity of cross section and polarization data over the photon energy range 3-6 GeV have thus far hindered our understanding of the mechanism transition from nucleon resonance to the $t$-channel Pomeron and Reggeon exchange. This work presents differential cross sections for the reaction $\\\\gamma p\\\\rightarrow p\\\\eta$ with energy-tagged photon energies between 1.2 and 4.7 GeV using the CLAS spectrometer at Jefferson Laboratory. The $\\\\eta$ meson is reconstructed in its dominant charged decay channel $\\\\eta\\\\rightarrow \\\\pi^{+}\\\\pi^{-}\\\\pi^{0}$. The energy scale extends from the nucleon resonance regime to the Regge regime, allowing for studying the $t$-channel exchange mechanisms. The d$\\\\sigma/$d$\\\\Omega$ differential cross sections are compared with predictions of $\\\\eta$-MAID 2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. In the energy regime $W>2.5$ GeV, the d$\\\\sigma/$d$t$ differential cross sections are presented in comparison with the Regge model from the Joint Physics Analysis Center. The data confirm the expected dominance of $\\\\rho$, $\\\\omega$ vector-meson exchange. Differential cross sections and spin density matrix elements (SDMEs) are also measured for the reaction $\\\\gamma p\\\\rightarrow p\\\\omega$ in the energy range $1.6E_{\\\\gamma}
Download or read book Differential Cross Sections and Spin Density Matrix Elements for the Reaction Gamma P P Omega written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High-statistics differential cross sections and spin density matrix elements for the reaction gamma p -> p omega have been measured using the CLAS at Jefferson Lab for center-of-mass (CM) energies from threshold up to 2.84 GeV. Results are reported in 112 10-MeV wide CM energy bins, each subdivided into cos(theta_CM) bins of width 0.1. These are the most precise and extensive omega photoproduction measurements to date. A number of prominent structures are clearly present in the data. Many of these have not previously been observed due to limited statistics in earlier measurements.
Download or read book New Results in Omega Photoproduction Using High statistics Data Obtained from CLAS at Jefferson Lab written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High-statistics differential cross sections and spin density matrix elements for the reaction [gamma]p --> p[omega] have been measured using the CLAS at Jefferson Lab for center-of-mass energies, W, from threshold up to 2.84 GeV. An event-based partial wave analysis (PWA) has also been performed on the data. This analysis benefits from access to the world's first high precision spin density matrix element measurements, available to the event-based PWA through the decay distribution of omega-->pi+pi-pi0. Strong evidence has been found for nucleon resonance contributions.
Download or read book Measurement of Differential Cross Sections and Spin Density Matrix Elements Along with a Partial Wave Analysis for p u2192 P Using CLAS at JLab written by and published by . This book was released on 2007 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents measurements of differential cross sections, d?/dcos?$?top{CW}$, and spin density matrix elements, P$0top{MM'}$, for the reaction ?p → p? in the energy range 1.72 GeV
Download or read book Measurement of Differential Cross Sections and Cx and Cz for Gamma P K Lambda and Gamma P K Sigma0 Using CLAS at Jefferson Lab written by Robert K. Bradford and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Data Analysis Techniques Differential Cross Sections and Spin Density Matrix Elements for the Reaction p u2192 p written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High-statistics measurements of differential cross sections and spin density matrix elements for the reaction ? p → ?p have been made using the CLAS detector at Jefferson Lab. We cover center-of-mass energies (√s) from 1.97 to 2.84 GeV, with an extensive coverage in the ? production angle. The high statistics of the data sample made it necessary to carefully account for the interplay between the ? natural lineshape and effects of the detector resolution, that are found to be comparable in magnitude. We study both the charged- (? → K+K−) and neutral- (? → K0SK0L) $Kar{K}$ decay modes of the ?. Further, for the charged mode, we differentiate between the cases where the final K− track is directly detected or its momentum reconstructed as the total missing momentum in the event. The two charged-mode topologies and the neutral-mode have different resolutions and are calibrated against each other. Extensive usage is made of kinematic fitting to improve the reconstructed ? mass resolution. Our final results are reported in 10- and mostly 30-MeV-wide √s bins for the charged- and the neutral-mode, respectively. Possible effects from K+?* channels with p$Kar{K}$ final-states are discussed. These present results constitute the most precise and extensive ? photoproduction measurements to date and in conjunction with the ? photoproduction results recently published by CLAS, will greatly improve our understanding of low energy vector meson photoproduction.
Download or read book Measurement of Differential Cross Sections and Cx and Cz for p u2192 K and p u2192 K Using CLAS at Jefferson Lab written by and published by . This book was released on 2005 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents several observables for the reactions ? p → K+? and ? p → K+?°. In addition to measuring differential cross sections, we have made first measurements of the double polarization observables Cx and Cz. Cx and C z characterize the transfer of polarization from the incident photon to the produced hyperons. Data were obtained at Jefferson Lab using a circularly polarized photon beam at endpoint energies of 2.4, 2.9, and 3.1 GeV. Events were detected with the CLAS spectrometer. In the ? channel, the cross sections support the recent observation of new resonant structure at W = 1900 MeV. Studies of the invariant cross section, $d?/top{dt}$ show scaling behavior suggesting that the production mechanism becomes t-channel dominated near threshold at forward kaon angles. The double polarization observables show that the recoiling ? is almost maximally polarized along the direction of the incident photon from mid to forward kaon angles. While ?o differential cross sections are of the same magnitude as the ? differential cross sections, there is evidence of different physics dominating the production mechanism. The ?° invariant cross sections do not show the same t-scaling behavior present in the ? results. The double polarization observables indicate that the ?° is not polarized as strongly as the ?. They also fail to identify one preferred polarization axis. Complete interpretation of these results will rely on model calculations. Currently available isobar models obtain varying degrees of success while attempting to predict the double polarization observables. While the models are in better agreement with the differential cross sections, discrepancies with our cross sections indicate that they must be re-optimized in light of the new data. While the data suggest that a Regge model would provide a good description of K+? over most of the range in W, the available Regge calculation overstates the strength of the cross section and does not predict Cx and Cz correctly.
Download or read book Differential Cross Sections and Recoil Polarizations for the Reaction math Display written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, high-statistics measurements of differential cross sections and recoil polarizations for the reaction $\gamma p \rightarrow K^+ \Sigma^0$ have been obtained using the CLAS detector at Jefferson Lab. We cover center-of-mass energies ($\sqrt{s}$) from 1.69 to 2.84 GeV, with an extensive coverage in the $K^+$ production angle. Independent measurements were made using the $K^{+}p\pi^{-}$($\gamma$) and $K^{+}p$($\pi^-, \gamma$) final-state topologies, and were found to exhibit good agreement. Our differential cross sections show good agreement with earlier CLAS, SAPHIR and LEPS results, while offering better statistical precision and a 300-MeV increase in $\sqrt{s}$ coverage. Above $\sqrt{s} \approx 2.5$ GeV, $t$- and $u$-channel Regge scaling behavior can be seen at forward- and backward-angles, respectively. Our recoil polarization ($P_\Sigma$) measurements represent a substantial increase in kinematic coverage and enhanced precision over previous world data. At forward angles we find that $P_\Sigma$ is of the same magnitude but opposite sign as $P_\Lambda$, in agreement with the static SU(6) quark model prediction of $P_\Sigma \approx -P_\Lambda$. This expectation is violated in some mid- and backward-angle kinematic regimes, where $P_\Sigma$ and $P_\Lambda$ are of similar magnitudes but also have the same signs. In conjunction with several other meson photoproduction results recently published by CLAS, the present data will help constrain the partial wave analyses being performed to search for missing baryon resonances.
Download or read book Differential Cross Sections and Recoil Polarizations for the Reaction p u2192 K 0 written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, high-statistics measurements of differential cross sections and recoil polarizations for the reaction $\gamma p \rightarrow K+̂ \Sigma0̂$ have been obtained using the CLAS detector at Jefferson Lab. We cover center-of-mass energies ($\sqrt{s}$) from 1.69 to 2.84 GeV, with an extensive coverage in the $K+̂$ production angle. Independent measurements were made using the $K{̂+}p\pi{̂-}$($\gamma$) and $K{̂+}p$($\pi-̂,\gamma$) final-state topologies, and were found to exhibit good agreement. Our differential cross sections show good agreement with earlier CLAS, SAPHIR and LEPS results, while offering better statistical precision and a 300-MeV increase in $\sqrt{s}$ coverage. Above $\sqrt{s} \approx 2.5$ GeV, $t$- and $u$-channel Regge scaling behavior can be seen at forward- and backward-angles, respectively. Our recoil polarization ($P_\Sigma$) measurements represent a substantial increase in kinematic coverage and enhanced precision over previous world data. At forward angles we find that $P_\Sigma$ is of the same magnitude but opposite sign as $P_\Lambda$, in agreement with the static SU(6) quark model prediction of $P_\Sigma \approx -P_\Lambda$. This expectation is violated in some mid- and backward-angle kinematic regimes, where $P_\Sigma$ and $P_\Lambda$ are of similar magnitudes but also have the same signs. In conjunction with several other meson photoproduction results recently published by CLAS, the present data will help constrain the partial wave analyses being performed to search for missing baryon resonances.
Download or read book Differential Cross Sections for Gamma P K Y for Lambda and Sigma0 Hyperons written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High-statistics cross sections for the reactions? + p → K +? and? + p → K+ +?° have been measured using CLAS at Jefferson Lab for center-of-mass energies W between 1.6 and 2.53 GeV, and for -0.85
Download or read book Measurement of Differential Cross Sections and Cx and Cz for Gamma Photon proton Going to Kaon lambda Baryon and Gamma Photon proton Going to Kaon sigma Baryon Using CLAS at Jefferson Lab written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents several observables for the reactions [gamma] p → K+[Lambda] and [gamma] p → K+[Sigma]°. In addition to measuring differential cross sections, we have made first measurements of the double polarization observables Cx and Cz. Cx and C z characterize the transfer of polarization from the incident photon to the produced hyperons. Data were obtained at Jefferson Lab using a circularly polarized photon beam at endpoint energies of 2.4, 2.9, and 3.1 GeV. Events were detected with the CLAS spectrometer. In the [Lambda] channel, the cross sections support the recent observation of new resonant structure at W = 1900 MeV. Studies of the invariant cross section, dsdd show scaling behavior suggesting that the production mechanism becomes t-channel dominated near threshold at forward kaon angles. The double polarization observables show that the recoiling [Lambda] is almost maximally polarized along the direction of the incident photon from mid to forward kaon angles. While [Sigma]o differential cross sections are of the same magnitude as the [Lambda] differential cross sections, there is evidence of different physics dominating the production mechanism. The [Sigma]° invariant cross sections do not show the same t-scaling behavior present in the [Lambda] results. The double polarization observables indicate that the [Sigma]° is not polarized as strongly as the [Lambda]. They also fail to identify one preferred polarization axis. Complete interpretation of these results will rely on model calculations. Currently available isobar models obtain varying degrees of success while attempting to predict the double polarization observables. While the models are in better agreement with the differential cross sections, discrepancies with our cross sections indicate that they must be re-optimized in light of the new data. While the data suggest that a Regge model would provide a good description of K+[Lambda] over most of the range in W, the available Regge calculation overstates the strength of the cross section and does not predict Cx and Cz correctly.
Download or read book Differential Cross Sections for the Reactions math Display written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In high-statistics differential cross sections for the reactions [gamma] p -> p [eta] and [gamma] p -> p [eta]' the CLAS at Jefferson Lab was used to measure the center-of-mass energies from near threshold up to 2.84 GeV. The eta-prime results are the most precise to date and provide the largest energy and angular coverage. The eta measurements extend the energy range of the world's large-angle results by approximately 300 MeV. These new data, in particular the [eta]' measurements, are likely to help constrain the analyses being performed to search for new baryon resonance states.
Download or read book A Measurement of the Differential Cross Section for the Reaction gamma N to pi P from Deuterium written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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$^\circ$.
Download or read book A Measurement of Unpolarized Cross Sections and Polarized Cross Section Differences of Deeply Virtual Compton Scattering on the Proton at Jefferson Laboratory Using CLAS e1 dvcs2 written by Nicholas A. N. Hirlinger Saylor and published by . This book was released on 2013 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quasi free Cross Section Measurements at CLAS written by and published by . This book was released on 2014 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary measurements of the quasi-free differential cross sections of the gD -->pp-(p), gD --> K*(892)0L(p), and gD --> K+S*(1385)-(p) reactions are shown using data from the Jefferson Lab Hall B CLAS g13 experiment. No experimental cross section data have yet been published on gD --> K*(892)0L(p), and the only published cross section data on gD --> K+S*(1385)-(p) are at forward angles, where t-channel K+ and K*+ exchanges are predicted to dominate. These data can be used to contribute to the search for the "missing" N* resonances, some of which are predicted to have non-negligible couplings to the excited strangeness channels. These cross sections are shown to be sizable compared to the ground-state channels, indicating that it is important to include excited channels in coupled-channels analyses used to extract the N* resonances. In addition, the gD --> pp-(p) data provide a significant increase to the world statistics, and will be used to study rescattering effects within the deuteron.
