Target And Double Spin Asymmetries Of Deeply Virtual Pi0 Production With A Longitudinally Polarized Proton Target And Clas PDF Download
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| Total Pages | : 6 |
| Release | : 2017 |
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Download Target and Double Spin Asymmetries of Deeply Virtual [pi]0 Production with a Longitudinally Polarized Proton Target and CLAS. Book in PDF, ePub and Kindle
The target and double spin asymmetries of the exclusive pseudoscalar channel $\vec e\vec p\to ep\pi^0$ were measured for the first time in the deep-inelastic regime using a longitudinally polarized 5.9 GeV electron beam and a longitudinally polarized proton target at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS). The data were collected over a large kinematic phase space and divided into 110 four-dimensional bins of $Q^2$, $x_B$, $-t$ and $\phi$. Large values of asymmetry moments clearly indicate a substantial contribution to the polarized structure functions from transverse virtual photon amplitudes. The interpretation of experimental data in terms of generalized parton distributions (GPDs) provides the first insight on the chiral-odd GPDs $\tilde{H}_T$ and $E_T$, and complement previous measurements of unpolarized structure functions sensitive to the GPDs $H_T$ and $\bar E_T$. Finally, these data provide necessary constraints for chiral-odd GPD parametrizations and will strongly influence existing theoretical handbag models.
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| Release | : 2014 |
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Download Single and Double Polarization Asymmetries from Deeply Virtual Exclusive Pi^0 Electroproduction Book in PDF, ePub and Kindle
The target and double spin asymmetry measurements of exclusive p0 electroproduction were performed for the first time in DIS region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS) and longitudinally polarized proton target. The wide kinematic coverage and good resolution of CLAS allowed measurements in full azimuthal range providing an opportunity to extract single and double spin asymmetries proportional to polarized structure functions. Their angular dependencies in hadronic center-of-mass system were analyzed, and extracted moments are compared to recent theoretical handbag-based calculations based on chiral-even and chiral-odd GPDs contributions. The interpretation of present results within the framework of the modified perturbative approach and their use as a constraint for models of the t behavior will be discussed.
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| Release | : 2010 |
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Download Measurement of Single and Double Spin Asymmetries in Deep Inelastic Pion Electroproduction with a Longitudinally Polarized Target Book in PDF, ePub and Kindle
We report the first measurement of the transverse momentum dependence of double spin asymmetries in semi-inclusive production of pions in deep inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Thomas Jefferson National Accelerator Facility (JLab). A significant non-zero $\sin2\phi$ single spin asymmetry was also observed for the first time indicating strong spin-orbit correlations for transversely polarized quarks in the longitudinally polarized proton. The azimuthal modulations of single spin asymmetries have been measured over a wide kinematic range.
| Author | : Erin E. Seder |
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| Total Pages | : 239 |
| Release | : 2013 |
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Download Target-spin Asymmetry Measurements for Deeply Virtual Compton Scattering on Longitudinally Polarized Protons Book in PDF, ePub and Kindle
| Author | : Feng-kun Guo |
| Publisher | : World Scientific |
| Total Pages | : 800 |
| Release | : 2020-07-28 |
| Genre | : Science |
| ISBN | : 981121932X |
Download Hadron Spectroscopy And Structure - Proceedings Of The Xviii International Conference Book in PDF, ePub and Kindle
This is the conference proceedings for the 18th International Conference on Hadron Spectroscopy and Structure (HADRON2019), held in Guilin, China. It is among the most important conference series in the field of hadron spectroscopy and structure. Collecting more than 130 contributions from this conference, the book spans over the topics of meson and baryon spectroscopy, exotic hadrons, hadron production and interactions, analysis tools, QCD and hadron structure, hadrons in nuclear environment and hypernuclei. Summaries of the recent discoveries from Belle, BESIII, LHCb and other high-energy experiments, as well as recent theoretical developments in the above mentioned topics, are contained in this volume, rendering it as a valuable resource for researchers working on hadron spectroscopy and structure.
| Author | : Suman Bandhu Koirala |
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| Total Pages | : 293 |
| Release | : 2014 |
| Genre | : Deuterons |
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Download Measurement of Single and Double Spin Asymmetries in Semi-inclusive Deep-inelastic Scattering on Proton and Deuteron Book in PDF, ePub and Kindle
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| Total Pages | : 45204 |
| Release | : 2008 |
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Download First Measurement of Target and Double Spin Asymmetries for Polarized E- Polarized P --] E P Pi0 in the Nucleon Resonance Region Above the Delta(1232). Book in PDF, ePub and Kindle
DOI: http://dx.doi.org/10.1103/PhysRevC.78.045204 The exclusive channel polarized proton(polarized e, e prime p)pi0 was studied in the first and second nucleon resonance regions in the Q2 range from 0.187 to 0.770 GeV2 at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). Longitudinal target and beam-target asymmetries were extracted over a large range of center-of-mass angles of the pi0 and compared to the unitary isobar model MAID, the dynamic model by Sato and Lee, and the dynamic model DMT. A strong sensitivity to individual models was observed, in particular for the target asymmetry and in the higher invariant mass region. This data set, once included in the global fits of the above models, is expected to place strong constraints on the electrocoupling amplitudes A_1/2 and S_1/2 for the Roper resonance N(1400)P11, and the N(1535)S11 and N(1520)D13 states.
| Author | : Jin Huang (Ph. D.) |
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| Total Pages | : 291 |
| Release | : 2012 |
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Download Double Spin Asymmetry AL̳T̳ in Charged Pion Production from Deep Inelastic Scattering on a Transversely Polarized 3He Target Book in PDF, ePub and Kindle
In this thesis I discuss the first measurement of the beam-target double-spin asymmetry ALT for charged pion electroproduction in deep inelastic electron scattering on a transversely polarized 3He target. These data were taken between October 2008 to February 2009 using a 5.9 GeV polarized electron beam at Thomas Jefferson National Accelerator Facility Experimental Hall A. The kinematics focused on the valence quark region, 0.16
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| Total Pages | : 176 |
| Release | : 2012 |
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Download SANE's Measurement of the Proton's Virtual Photon Spin Asymmetry, Ap1, at Large Bjorken X Book in PDF, ePub and Kindle
The experiment SANE (Spin Asymmetries of the Nucleon Experiment) measured inclusive double polarization electron asymmetries on a proton target at the Continuous Electron Beam Accelerator Facility at the Thomas Jefferson National Laboratory in Newport News Virgina. Polarized electrons were scattered from a solid 14NH3 polarized target provided by the University of Virginia target group. Measurements were taken with the target polarization oriented at 80 degrees and 180 degrees relative to the beam direction, and beam energies of 4.7 and 5.9 GeV were used. Scattered electrons were detected by a multi-component novel non-magnetic detector package constructed for this experiment. Asymmetries measured at the two target orientations allow for the extraction of the virtual Compton asymmetries A1p and A2p as well as the spin structure functions g1p and g2p. This work addresses the extraction of the virtual Compton asymmetry A1p in the deep inelastic regime. The analysis uses data in the kinematic range from Bjorken x of 0.30 to 0.55, separated into four Q2 bins from 1.9 to 4.7 GeV2.
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| Total Pages | : 6 |
| Release | : 2012 |
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Download Beam-Target Double Spin Asymmetry A[sub]LT[/sub] in Charged Pion Production from Deep Inelastic Scattering on a Transversely Polarized [sup]3[/sup]He Target at 1.4[Q[sup]2[/sup][2.7 GeV[sup]2[/sup]. Book in PDF, ePub and Kindle
We report the first measurement of the double-spin asymmetry ALT for charged pion electroproduction in semi-inclusive deep inelastic electron scattering on a transversely polarized 3He target. The kinematics focused on the valence quark region, 0.16 x 0.35 with 1.4 Qsup2/sup 2.7 GeVsup2/sup. The corresponding neutron AsubLT/sub asymmetries were extracted from the measured sup3/supHe asymmetries and proton/sup3/supHe cross section ratios using the effective polarization approximation. These new data probe the transverse momentum dependent parton distribution function gsub 1T/subsupq/sup and therefore provide access to quark spin-orbit correlations. Our results indicate a positive azimuthal asymmetry for?sup-
