Longitudinal Double Spin Asymmetry Of Electrons From Heavy Flavor Decays In Polarized P P Collisions At S 200 Gev PDF Download
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Author | : Katsuro Nakamura |
Publisher | : Springer |
Total Pages | : 151 |
Release | : 2014-05-21 |
Genre | : Science |
ISBN | : 4431546162 |
Download Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized p + p Collisions at √s = 200 GeV Book in PDF, ePub and Kindle
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
Author | : Katsuro Nakamura |
Publisher | : |
Total Pages | : 160 |
Release | : 2014-06-30 |
Genre | : |
ISBN | : 9784431546177 |
Download Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized P + P Collisions at S = 200 Gev Book in PDF, ePub and Kindle
Author | : Katsuro Nakamura |
Publisher | : |
Total Pages | : |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized P + P Collisions at [square Root] Book in PDF, ePub and Kindle
Author | : Josh Freed |
Publisher | : Brookings Institution Press |
Total Pages | : 27 |
Release | : 2014-12-12 |
Genre | : Political Science |
ISBN | : 081572666X |
Download Back to the Future Book in PDF, ePub and Kindle
The Golden Age of nuclear energy in the United States has passed, and the accidents, if not disasters, at Three Mile Island, Chernobyl, and Fukushima have damaged nuclear power’s rise in some parts of the world. And yet today, as Third Way’s Josh Freed illuminates in the latest Brookings Essay, a flood of young engineers are exploring safer and cleaner nuclear energy technologies as the best option for powering the world and addressing the looming threat of climate change. Yet as Freed demonstrates, advanced nuclear energy is too big, complex, and expensive to take off without significant political backing and changes in how the government supports innovation. If the U.S. doesn’t invest in advanced nuclear, he argues, it’s inevitable that another country will lead the way in this game-changing field. THE BROOKINGS ESSAY: In the spirit of its commitment to high-quality, independent research, the Brookings Institution has commissioned works on major topics of public policy by distinguished authors, including Brookings scholars. The Brookings Essay is a multi-platform product aimed to engage readers in open dialogue and debate. The views expressed, however, are solely those of the author. Available in ebook only.
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Release | : 2015 |
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Download Precision Measurement of the Longitudinal Double-spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at {u221A}s Book in PDF, ePub and Kindle
We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, ALL, in polarized pp collisions at center-of-mass energy √s = 200 GeV. The STAR data place stringent constraints on polarized parton distribution functions extracted at next-to-leading order from global analyses of inclusive deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC pp data. Lastly, the measured asymmetries provide evidence at the 3? level for positive gluon polarization in the Bjorken-x region x > 0.05 .
Author | : Julie Marie Millane |
Publisher | : |
Total Pages | : 204 |
Release | : 2008 |
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Download Longitudinal Double Spin Asymmetry for Inclusive Jet Production in Polarized Proton-proton Collisions at [square Root Of] S Book in PDF, ePub and Kindle
We present the Inclusive Jet Longitudinal Double-Spin Asymmetry for polarized protons at \s = 200 GeV. The data were taken on the STAR experiment at RHIC during the 2005 run period and cover a jet transverse momentum range of 5
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Total Pages | : 3 |
Release | : 2005 |
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Download MEASUREMENT OF THE DOUBLE LONGITUDINAL SPIN ASYMMETRY IN INCLUSIVE JET PRODUCTION IN POLARIZED P+P COLLISIONS AT S**ư Book in PDF, ePub and Kindle
We present preliminary results for the first measurements of the double longitudinal spin asymmetry A{sub LL} in inclusive jet production at mid-rapidity in polarized proton-proton collisions at √s = 200 GeV. The data amount to ≈ 0.5 pb−1 collected at RHIC in 2003 and 2004 with beam polarizations up to 45%. The jet transverse energies are in the range of 5
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Download רסיסים מהעבר הקרוב Book in PDF, ePub and Kindle
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Release | : 2007 |
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Download Longitudinal Double-spin Asymmetry for Inclusive Jet Production in Vec P + Vec P Collisions at Sqrt S Book in PDF, ePub and Kindle
We report a new STAR measurement of the longitudinal double-spin asymmetry A{sub LL} for inclusive jet production at mid-rapidity in polarized p + p collisions at a center-of-mass energy of (square root)s = 200 GeV. The data, which cover jet transverse momenta 5
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Release | : 2006 |
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Download Longitudinal Double-spin Asymmetry and Cross Section for Inclusivejet Production in Polarized Proton Collisions at Sqrt(s) Book in PDF, ePub and Kindle
We report a measurement of the longitudinal double-spinasymmetry A_LL and the differential cross section for inclusivemidrapidity jet production in polarized proton collisions at sqrt(s)=200GeV. The cross section data cover transverse momenta 5