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Showing 1 to 13 of 13 for “"Double spin asymmetry"”.
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Double Spin Asymmetry in d →(e→e'p)n
<p>Using the CLAS detector at Jefferson Lab, double spin asymmetries (A ∥) for quasi-elastic electron scattering off the deuteron have been measured at several beam energies. The data were collected during the EG1 experiment, which scattered longitudinally polarized electrons with energies from 1.6 …
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Double spin asymmetry AL̳T̳ in charged pion production from deep inelastic scattering on a transversely polarized ³He target
… 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 …
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Longitudinal double spin asymmetry for inclusive jet production in polarized proton-proton collisions at [square root of] s = 200 GeV
We present the Inclusive Jet Longitudinal Double-Spin Asymmetry for polarized protons at \s = 200 GeV. The data were taken on the STAR experiment at RHIC during the 2005 run period and cover a jet transverse momentum range of 5 < pT < 30 GeV/c. The main detector components used were the …
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Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production in polarized proton collisions at [the square root of sigma] = 200 GeV.
… have found that the contribution from quark spins (1/2[delta] [sigma]) to the spin of the proton is only ~ 35%. This has lead researchers to look elsewhere, specifically to gluon spin ([delta sigma]) for a large contribution to proton spin. [delta sigma] has been only loosely constrained in …
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Double helicity asymmetry for charged pion + jet production in p+p collisions at [square root of] s=200 GeV at STAR
… larger quark polarization amplifies the measured asymmetry thereby enhancing the statistical power. This thesis presents the result of the mid-rapidity pion+jet longitudinal double spin asymmetry analysis from 10.6 pb-1 of luminosity collected in the 2009 200 GeV p+p run.
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Inclusive jet and dijet production in polarized proton-proton collisions at [the square root of sigma] =200 GeV at RHIC
… dijet cross section, and the dijet longitudinal double spin asymmetry ALL in polarized proton-proton collisions at [square root of sigma] = 200 GeV are measured with a data sample of 5.4 pbm collected with the STAR detector during RHIC Run-6. The inclusive cross section is measured as a function …
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Feasibility study on extracting the gluon polarization in Di-Jet production in polarized pp collisions at RHIC
… National Laboratory (BNL) is carrying out a spin physics program at is = 200 - 500 GeV to gain a deeper insight into the spin structure and dynamics of the proton. These studies provide fundamental tests of Quantum Chromodynamics (QCD). One of the main objectives of the STAR spin physics …
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Measurement of longitudinal double spin asymmetries of [pi]+/- production in p[over-arrow] + p[over-arrow] collisions at [sqrt]s = 200 GeV at RHIC
Spin dependent measurements provide incisive tests for modern theories of particle physics. The discovery that the integral of the quark helicity distribution is much too small to account for the spin of the proton is an excellent case in point. It inspired an intense period of theoretical scrutiny …
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Dijet production in polarized proton-proton collisions at [the square root of sigma] = 200 GeV
… only carry approximately 30% of the proton spin, which led to interest in measuring the contributions of other components. Through polarized proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC), the world's only polarized proton collider, it is possible to make an …
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Exclusive Production of Quarkonia and Generalized Parton Distributions
… we looked at are the unpolarized cross section, spin density matrix elements, and two spin-asymmetries --- the transverse single-spin asymmetry An, and a newly discussed double-spin asymmetry ALS, which we identified as a very promising observable for measuring Eg. We find that in the case of J/ψ …
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Spin Structure of the Deuteron
<p>Double spin asymmetries for the proton and the deuteron have been measured in the EG1b experiment using the CLAS detector at Jefferson Lab. Longitudinally polarized electrons at energies 1.6, 2.5, 4.2 and 5.7 GeV were scattered from longitudinally polarized NH3 and ND3 targets. The double spin …
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Measurement of double longitudinal asymmetries, A_{LL}, for pi0 production in polarized pp scattering at low Bjorken-x
The gluon contribution to the spin of the proton, G, can be extracted from double spin asymmetries for inclusive 0 production in polarized pp collisions at RHIC. The combined analysis of RHIC data taking runs through 2009 indicates that G is positive for relative gluon momenta x > 0:05. The …
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Gluon polarization in the proton: constraints at low x from the measurement of the double longitudinal spin asymmetry for forward-rapidity hadrons with the PHENIX detector at RHIC
… revealed that only about a third of the proton's spin of $\frac{1}{2}\hbar$ is carried by the quarks and antiquarks, leaving physicists with the puzzle of how to account for the remaining spin. As gluons carry roughly 50\% of the proton's momentum, it seemed most logical to look to the gluon spin …