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
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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
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Author :
language : en
Publisher:
Release Date : 2012
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 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
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-
Erda Energy Research Abstracts
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Author : United States. Energy Research and Development Administration
language : en
Publisher:
Release Date : 1977
Erda Energy Research Abstracts written by United States. Energy Research and Development Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Measurement Of The Double Spin Asymmetry In Pi Sup Electroproduction With Clas
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Author :
language : en
Publisher:
Release Date : 2004
Measurement Of The Double Spin Asymmetry In Pi Sup Electroproduction With Clas written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The double spin asymmetry[sigma][sub et]/[sigma][sub 0] has been measured in[pi][sup -] electro-production using a polarized electron beam and a polarized ND[sub 3] target, and using a CEBAF Large Acceptance Spectrometer (CLAS). The electron beam was polarized using a GaAs-cathode and the target was polarized via Dynamic Nuclear Polarization. The beam polarization was around 70% and the target polarization was between 10 and 20 percent. The data at 2.5 GeV beam energy and two different magnetic field settings (2250 A and -1500 A) were collected in Hall B at Jefferson Lab in the Fall of 1998. The e[pi][sup -] channel was selected using the missing mass technique and applying a cut around the proton peak (0.78 GeV[sup 2]
Double Spin Asymmetry Al T In Charged Pion Production From Deep Inelastic Scattering On A Transversely Polarized 3he Target
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Author : Jin Huang (Ph. D.)
language : en
Publisher:
Release Date : 2012
Double Spin Asymmetry Al T In Charged Pion Production From Deep Inelastic Scattering On A Transversely Polarized 3he Target written by Jin Huang (Ph. D.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
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
Beam Target Double Spin Asymmetry Alt In Charged Pion Production From Deep Inelastic Scattering On A Transversely Polarized 3he Target At 1 4 Q2 2 7 Gev2
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Author :
language : en
Publisher:
Release Date : 2012
Beam Target Double Spin Asymmetry Alt In Charged Pion Production From Deep Inelastic Scattering On A Transversely Polarized 3he Target At 1 4 Q2 2 7 Gev2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
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
Precise Measurements Of Beam Spin Asymmetries In Semi Inclusive Pi 0 Production
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Author :
language : en
Publisher:
Release Date : 2011
Precise Measurements Of Beam Spin Asymmetries In Semi Inclusive Pi 0 Production written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
We present studies of single-spin asymmetries for neutral pion electroproduction in semi-inclusive deep-inelastic scattering of 5.776 GeV polarized electrons from an unpolarized hydrogen target, using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. A substantial sin [Phi]h amplitude has been measured in the distribution of the cross section asymmetry as a function of the azimuthal angle [Phi]h of the produced neutral pion. The dependence of this amplitude on Bjorken x and on the pion transverse momentum is extracted with significantly higher precision than previous data and is compared to model calculations.
Beam Spin Asymmetries From Semi Inclusive Pion Electroproduction
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Author :
language : en
Publisher:
Release Date : 2014
Beam Spin Asymmetries From Semi Inclusive Pion Electroproduction written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
We have measured the moment A{sup sin?}{sub LU} corresponding to the polarized electron beam-spin asymmetry in SIDIS. A{sup sin?}{sub LU} is a twist-3 quantity providing information about quark-gluon correlations. Data were taken with the CLAS Spectrometer at Jefferson Lab using a 5.498 GeV longitudinally polarized electron beam and an unpolarized liquid hydrogen target. All three pion channels (pi, pi° and pi−) were measured simultaneously over a large range of kinematics within the virtuality range Q2 ̃1.0-4.5 GeV2. The observable was measured with good statistical precision over a large range of z, P{sub T}, x{sub B}, and Q2, which permits comparison with several reaction models. The discussed measurements provide an upgrade in statistics over previous measurements, and serve as the first evidence for the negative sign of the?− sin? Moment.
Final State Interactions And Single Spin Asymmetries In Semi Inclusive Deep Inelastic Scattering
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Author :
language : en
Publisher:
Release Date : 2002
Final State Interactions And Single Spin Asymmetries In Semi Inclusive Deep Inelastic Scattering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Recent measurements from the HERMES and SMC collaborations show a remarkably large azimuthal single-spin asymmetries AUL and AUT of the proton in semi-inclusive pion leptoproduction[gamma]*(q)p[yields][pi]X. We show that final-state interactions from gluon exchange between the outgoing quark and the target spectator system lead to single-spin asymmetries in deep inelastic lepton-proton scattering at leading twist in perturbative QCD; i.e., the rescattering corrections are not power-law suppressed at large photon virtuality Q[sup 2] at fixed x[sub bj]. The existence of such single-spin asymmetries requires a phase difference between two amplitudes coupling the proton target with J[sub P][sup z]=[+-] 1/2 to the same final-state, the same amplitudes which are necessary to produce a nonzero proton anomalous magnetic moment. We show that the exchange of gauge particles between the outgoing quark and the proton spectators produces a Coulomb-like complex phase which depends on the angular momentum L[sup z] of the proton's constituents and is thus distinct for different proton spin amplitudes. The single-spin asymmetry which arises from such final-state interactions does not factorize into a product of distribution function and fragmentation function, and it is not related to the transversity distribution[delta]q(x, Q) which correlates transversely polarized quarks with the spin of the transversely polarized target nucleon.
Single Spin Asymmetries In Charged Pion Production From Semi Inclusive Deep Inelastic Scattering On A Transversely Polarized 3 He Target
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Author :
language : en
Publisher:
Release Date : 2011
Single Spin Asymmetries In Charged Pion Production From Semi Inclusive Deep Inelastic Scattering On A Transversely Polarized 3 He Target written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
We report the first measurement of target single spin asymmetries in the semi-inclusive $^3{He}(e, e'\pi^\pm)X$ reaction on a transversely polarized target. The experiment, conducted at Jefferson Lab using a 5.9 GeV electron beam, covers a range of 0.14 $
Recent Results Of Target Single Spin Asymmetry Experiments At Jefferson Lab
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Author :
language : en
Publisher:
Release Date : 2013
Recent Results Of Target Single Spin Asymmetry Experiments At Jefferson Lab written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
We report recent results from Jefferson Lab Hall A "Neutron Transversity" experiment (E06-010). Transversely polarized target single-spin asymmetry AUT and beam-target double-spin asymmetry A{sub LT} have been measured in semi-inclusive deep-inelastic scattering (SIDIS) reactions on a polarized neutron (3He) target. Collins-type and Sivers-type asymmetries have been extracted from A{sub UT} for charged pion SIDIS productions, which are sensitive to quark transversity and Sivers distributions, correspondingly. Double spin asymmetry A{sub LT} is sensitive to a specific quark transverse momentum dependent parton distribution (TMD), the so-called "transverse helicity" (g{sub 1T}) distributions. In addition, target single-spin asymmetries A{sub y} in inclusive electron scattering on a transversely polarized 3He target in quasi-elastic and deep inelastic kinematics were also measured in Hall A.