03613nam a22005535i 4500 978-4-431-54616-0 DE-He213 20210616235834.0 cr nn 008mamaa 140521s2014 ja | s |||| 0|eng d 9784431546160 978-4-431-54616-0 10.1007/978-4-431-54616-0 doi QC770-798 QC702.7.H42 PHM bicssc SCI051000 bisacsh PHM thema 539.7092 23 Nakamura, Katsuro. author. aut http://id.loc.gov/vocabulary/relators/aut Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized p + p Collisions at √s = 200 GeV [electronic resource] / by Katsuro Nakamura. 1st ed. 2014. Tokyo : Springer Japan : Imprint: Springer, 2014. XVI, 141 p. 94 illus., 31 illus. in color. online resource. text txt rdacontent computer c rdamedia online resource cr rdacarrier text file PDF rda Springer Theses, Recognizing Outstanding Ph.D. Research, 2190-5053 Nucleon Spin Physics -- Experimental Setup -- Electron Analysis -- Results -- Discussion -- Conclusion. In this thesis, the measurement of double-spin asymmetry for electron production from heavy flavor decays was performed in a Relativistic Heavy Ion Collider (RHIC) in the PHENIX experiment at Brookhaven National Laboratory to measure the polarized parton distribution function of gluon in the small Bjorken x region (x~0.01).   For this experiment, for the first time a Hadron Blind Detector (HBD), which is a position-sensitive gas Cherenkov counter with Gas Electron Multiplier whose surface is evaporated by CsI, was employed. This HBD contributes to reducing the background from electron pairs produced by real and virtual photon conversion. Furthermore, the author develops a new analysis method for the background reduction, and the signal-to-background ratio is improved by a factor of roughly 2.0. Using the combination of the HBD and a new analysis method, the double-spin asymmetry of the electron production with transverse momentum ranging 0.5 < pT < 3.0 GeV/c is measured and confirmed to be zero-consistent within the limit of the statistical uncertainty of about 1%. This result identifies the constraint of the gluon polarization in the small Bjorken x region, a worldwide first. Nuclear physics. Heavy ions. Particle acceleration. Physical measurements. Measurement   . Nuclear Physics, Heavy Ions, Hadrons. https://scigraph.springernature.com/ontologies/product-market-codes/P23010 Particle Acceleration and Detection, Beam Physics. https://scigraph.springernature.com/ontologies/product-market-codes/P23037 Measurement Science and Instrumentation. https://scigraph.springernature.com/ontologies/product-market-codes/P31040 SpringerLink (Online service) Springer Nature eBook Printed edition: 9784431546177 Printed edition: 9784431546153 Printed edition: 9784431563686 Springer Theses, Recognizing Outstanding Ph.D. Research, 2190-5053 https://doi.org/10.1007/978-4-431-54616-0 ZDB-2-PHA ZDB-2-SXP Physics and Astronomy (SpringerNature-11651) Physics and Astronomy (R0) (SpringerNature-43715)