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.
| ISBN: | 9784431563686 |
| Publication date: | 27th September 2016 |
| Author: | Katsuro Nakamura |
| Publisher: | Springer an imprint of Springer Japan |
| Format: | Paperback |
| Pagination: | 141 pages |
| Series: | Springer Theses |
| Genres: |
Atomic and molecular physics Particle and high-energy physics Scientific standards, measurement etc |
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.
Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized P + P Collisions at Vs = 200 GeV features in the following genres: Atomic and molecular physics, Particle and high-energy physics, Scientific standards, measurement etc
Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized P + P Collisions at Vs = 200 GeV is available in Paperback
Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized P + P Collisions at Vs = 200 GeV was written by Katsuro Nakamura and published by Springer an imprint of Springer Japan
Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized P + P Collisions at Vs = 200 GeV has 141 pages
Yes it is part of Springer Theses series