Neutral Pion Double Helicity Asymmetry In Polarized Proton Proton Collisions At The Square Root Of Sigma

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Neutral Pion Double Helicity Asymmetry In Polarized Proton Proton Collisions At The Square Root Of Sigma

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Author : William Axel Leight
language : en
Publisher:
Release Date : 2012

Neutral Pion Double Helicity Asymmetry In Polarized Proton Proton Collisions At The Square Root Of Sigma written by William Axel Leight and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.

One of the primary goals of the spin physics program at the STAR experiment is to constrain the polarized gluon distribution function, [delta]g(X,Q2), by measuring the double longitudinal spin asymmetry, ALL, of various final-state channels. Neutral pions provide a potentially powerful final state because they are copiously produced in p+p collisions and have few backgrounds. In 2009, STAR took 14 pb-1 of integrated luminosity of 200 GeV p+p collisions, with average beam longitudinal polarization of 59%. Neutral pions produced in these collisions can be identified using STAR's large-acceptance electromagnetic calorimeter, with help from tracking from the STAR Time Projection Chamber. This work presents a measurement of the inclusive neutral pion ALL from this data, based on a new [pi]0 reconstruction algorithm. A comparison to theoretical predictions and other experimental results suggests that the current best-fit value of AG, the gluon contribution to the proton spin, is too small and that [delta]G is actually comparable in magnitude to the quark contribution to the proton spin [delta][sigma].

Longitudinal Double Spin Asymmetry And Cross Section For Inclusive Neutral Pion Production In Polarized Proton Collisions At The Square Root Of Sigma

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Author : Alan Michael Hoffman
language : en
Publisher:
Release Date : 2009

Longitudinal Double Spin Asymmetry And Cross Section For Inclusive Neutral Pion Production In Polarized Proton Collisions At The Square Root Of Sigma written by Alan Michael Hoffman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.

Twenty years of polarized lepton-nucleon scattering experiments have found that the contribution from quark spins (1/2[delta] [sigma]) to the spin of the proton is only ~ 35%. This has lead researchers to look elsewhere, specifically to gluon spin ([delta sigma]) for a large contribution to proton spin. [delta sigma] has been only loosely constrained in polarized DIS and SIDIS experiments. Polarized proton-proton collisions at RHIC provide sensitivity to [delta sigma] through measurements of the longitudinal double-spin asymmetry, ALL. This work presents a measurement of ALL for inclusive 7ro production in polarized proton-proton collisions using the STAR detector and data from RHIC Run 6. 7r0s are abundantly produced at mid-rapidity in proton-proton collisions, making them natural candidates for studies of [delta] [sigma]. Novel techniques for reconstructing 7ros at STAR are discussed, and a measurement of the unpolarized cross section presented. Finally, the measured ALL is compared to perturbative QCD predictions and from this comparison constraints are placed on [delta] [sigma].

Physics Briefs

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Author :
language : en
Publisher:
Release Date : 1982

Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Physics categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1994

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.

Inis Atomindeks

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Author :
language : en
Publisher:
Release Date : 1979

Inis Atomindeks written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Nuclear energy categories.

Government Reports Announcements Index

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Author :
language : en
Publisher:
Release Date : 1984

Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Science categories.

Interference Problems On Wing Fuselage Combinations In Inviscid Incompressible Flow

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Author : Aeronautical Research Council (Great Britain)
language : en
Publisher:
Release Date : 1974

Interference Problems On Wing Fuselage Combinations In Inviscid Incompressible Flow written by Aeronautical Research Council (Great Britain) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Airplanes categories.

Government Reports Annual Index

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Author :
language : en
Publisher:
Release Date : 1983

Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Government reports announcements & index categories.

Government Reports Annual Index Keyword A L

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Author :
language : en
Publisher:
Release Date : 1983

Government Reports Annual Index Keyword A L written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Government reports announcements & index categories.

Longitudinal Double Spin Asymmetry Of Forward Neutral Pions From 510 Gev Polarized Proton Proton Collisions At Star

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Author : Christopher John Dilks
language : en
Publisher:
Release Date : 2018

Longitudinal Double Spin Asymmetry Of Forward Neutral Pions From 510 Gev Polarized Proton Proton Collisions At Star written by Christopher John Dilks and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.

Longitudinally polarized proton-proton scattering experiments provide access to the gluon polarizationcontribution to the overall proton spin via a measurement of the longitudinal double-spin asymmetry,$A_{LL}$. During RHIC data-taking periods in 2012 and 2013, a significant sample of $\pi^0$s scattered inthe forward direction was acquired from proton-proton collisions with a center-of-mass energy of 510 GeVand beam polarizations of $\sim 55\%$. The $\pi^0$ kinematics were measured by the STAR Forward MesonSpectrometer, an electromagnetic calorimeter spanning a forward pseudorapidity range of $2.5