| 書目名稱 | Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized p + p Collisio | | 編輯 | Katsuro Nakamura | | 視頻video | http://file.papertrans.cn/589/588607/588607.mp4 | | 概述 | Provides the detailed current states of the gluon polarization measurement, including recent results from the PHENIX and STAR experiment and the global analysis of the DSSV group.Introduces the option | | 叢書名稱 | Springer Theses | | 圖書封面 |  | | 描述 | .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. | | 出版日期 | Book 2014 | | 關(guān)鍵詞 | Gluon Polarization; Hadron Blind Detector; Heavy Quark Decay; Measurement of Electrons from Heavy Flavo | | 版次 | 1 | | doi | https://doi.org/10.1007/978-4-431-54616-0 | | isbn_softcover | 978-4-431-56368-6 | | isbn_ebook | 978-4-431-54616-0Series ISSN 2190-5053 Series E-ISSN 2190-5061 | | issn_series | 2190-5053 | | copyright | Springer Japan 2014 |
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