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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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].
Inis Atomindex
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Author :
language : en
Publisher:
Release Date : 1983
Inis Atomindex 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 Nuclear energy categories.
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 Inclusivejet Production In Polarized Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2006
Longitudinal Double Spin Asymmetry And Cross Section For Inclusivejet Production In Polarized Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
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
Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Polarized Proton Proton Collisions At Square Root Of S
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Author : Julie Marie Millane
language : en
Publisher:
Release Date : 2008
Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Polarized Proton Proton Collisions At Square Root Of S written by Julie Marie Millane and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
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
Measurement Of Longitudinal Double Spin Asymmetries Of Pi Production In P Over Arrow P Over Arrow Collisions At Sqrt S
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Author : Adam Philip Kocoloski
language : en
Publisher:
Release Date : 2010
Measurement Of Longitudinal Double Spin Asymmetries Of Pi Production In P Over Arrow P Over Arrow Collisions At Sqrt S written by Adam Philip Kocoloski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Spin dependent measurements provide incisive tests for modern theories of particle physics. The discovery that the integral of the quark helicity distribution is much too small to account for the spin of the proton is an excellent case in point. It inspired an intense period of theoretical scrutiny and a new generation of experiments to study [Delta]g, the helicity distribution of gluons in the nucleon. In particular, the unique polarized proton collider at RHIC enables a class of asymmetry measurements that are directly sensitive to gluon polarization. The STAR experiment at RHIC measures the double spin asymmetry A[subscript LL] for a variety of final states in collisions of longitudinally polarized protons in order to constrain [Delta]g. Asymmetries for mid-rapidity charged pion production benefit from large cross sections and the excellent tracking and particle identification capabilities of the STAR Time Projection Chamber. This thesis presents the first measurements of charged pion A[subscript LL] at STAR. The measurements are compared to predictions based on perturbative QCD calculations and from this comparison model-dependent constraints are placed on the integral gluon polarization [Delta]G.
Dijet Production In Polarized Proton Proton Collisions At The Square Root Of Sigma
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Author : Matthew Hsing Hung Walker
language : en
Publisher:
Release Date : 2011
Dijet Production In Polarized Proton Proton Collisions At The Square Root Of Sigma written by Matthew Hsing Hung Walker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Polarized deep inelastic scattering (DIS) experiments indicate that quarks only carry approximately 30% of the proton spin, which led to interest in measuring the contributions of other components. Through polarized proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC), the world's only polarized proton collider, it is possible to make an extraction of the polarized gluon distribution function [delta]g(x). This function describes the contribution of the gluon polarization to the proton spin. This thesis presents a measurement of the p + p ---> Jet + Jet + X (dijet) cross section from the 2005 RHIC running period and a measurement of the longitudinal double spin asymmetry ALL from the 2009 RHIC running period, both made using the Solenoidal Tracker at RHIC (STAR). The cross section is measured over the invariant mass range 20
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
Longitudinal Double Spin Asymmetry In Inclusive Jet Production Atstar
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Author : STAR Collaboration
language : en
Publisher:
Release Date : 2006
Longitudinal Double Spin Asymmetry In Inclusive Jet Production Atstar written by STAR Collaboration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
This contribution reports on the first measurement of the longitudinal double-spin asymmetry A{sub LL} for the inclusive production of jets in polarized proton-proton collisions at {radical}s = 200 GeV. The data were collected with STAR at RHIC in the years 2003 and 2004, and correspond to a sampled integrated luminosity of 0.3 pb{sup -1} with beam polarizations up to 45%. The results on A{sub LL} cover jet transverse momenta 5
Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Vec P Vec P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2007
Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Vec P Vec P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
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