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Showing 1 to 9 of 9 for “"Single-spin asymmetry"”.
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Measurement of target single-spin asymmetry in charged kaon electroproduction on a transversely polarized 3He target
The subject of quark transverse spin and transverse momentum distribution are two current research frontier in understanding the spin structure of the nucleons. The goal of the research reported in this dissertation is to extract new information on the quark transversity distribution and the novel …
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Spin Dependence in Polarized Proton-Proton Elastic Scattering at RHIC
… with the unique capability of RHIC to collide spin-polarized proton beams, allows STAR to study both the dynamics and the spin-dependence of the proton-proton (<em> pp</em>) elastic scattering process. Silicon strip detectors, installed inside the Roman Pots, measure tracks of protons scattered …
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The proton's longitudinal spin structure studied through the weak interaction in pp collisions
… years there has been limited knowledge of the spin structure of the proton. The degree to which the antiquarks and gluons of radiative origin inside the proton contribute to the total spin is particularly not well confined. The PHENIX experiment at RHIC has made measurements that have, and …
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W boson cross sections and single spin asymmetries in polarized proton-proton collisions at [square root of] s =500 GeV at STAR
… This has offered a first look at the spin-dependent production of W+(-) bosons, and hence at the spin-flavor structure of the proton, where the main production mode is through d+u (u+d) annihilation. Using STAR's large Time Projection Chamber and its wide-acceptance electromagnetic …
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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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Transverse Spin Structure of the Proton Studied in Semi–inclusive DIS
… differences of the number of quarks with their spins aligned and antialigned with the nucleon spin whose direction is longitudinal or respectively transversal to its momentum. The first two distributions have been measured extensively in the past. The transversity distribution, however, has …
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Precision measurement of the weak charge of the proton and parity violation in the N → ∆ transition
… the proton. Qweak measured the parity-violating asymmetry in elastic electron-proton scattering at an extreme forward angle (Q² = 0.0249 (GeV/c)² ). From the data gathered via the 1.16 GeV 180 μA longitudinally polarized electron beam scattering off the unpolarized photons in the liquid hydrogen …
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Measurement of transverse single-spin asymmetries in π0 and η Meson production in √s = 200 GEV p↑ + p collisions with sPHENIX
… describes the extraction of transverse single-spin asymmetries in inclusive production of π0 and η mesons decaying into two photons. Such observables are sensitive to multi-parton correlations in the proton, which are related to transverse-momentum dependent (TMD) effects. The new …
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Parity-Violating Elastic Electron Nucleon Scattering: Measurement of the Strange Quark Content of the Nucleon and Towards a Measurement of the Weak Charge of the Proton
… measurement of the hadronic contribution to the asymmetry in Q<sub>weak</sub>. In addition, G⁰ was able to measure the parity-conserving beam normal single spin asymmetries that provide a measurement of the imaginary part of two photon exchange. The measurement of this asymmetry is necessary to …