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Neutral Pion Double Helicity Asymmetry In Polarized Proton Proton Collisions At The Square Root Of Sigma
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Book Synopsis Neutral Pion Double Helicity Asymmetry in Polarized Proton-Proton Collisions at [the Square Root of Sigma] by : William Axel Leight
Download or read book Neutral Pion Double Helicity Asymmetry in Polarized Proton-Proton Collisions at [the Square Root of Sigma] written by William Axel Leight and published by . This book was released on 2012 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].
Book Synopsis Longitudinal Double-spin Asymmetry and Cross Section for Inclusive Neutral Pion Production in Polarized Proton Collisions at [the Square Root of Sigma] by : Alan Michael Hoffman
Download or read book 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 published by . This book was released on 2009 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].
Book Synopsis Measurement of Double Longitudinal Spin Asymmetry of Jet-[pi] +/- Correlations in Polarized Proton-proton Collisions at [square Root Of] S by : James Prewitt Hays-Wehle
Download or read book Measurement of Double Longitudinal Spin Asymmetry of Jet-[pi] +/- Correlations in Polarized Proton-proton Collisions at [square Root Of] S written by James Prewitt Hays-Wehle and published by . This book was released on 2013 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inclusive measurements from polarized proton-proton collisions at RHIC have constrained [Delta]g, the polarized gluon distribution function of the proton. Correlation observables, such as this pion+jet measurement, allow for reconstruction of initial parton kinematics and are thus sensitive to the x dependence of [Delta]g. By measuring charged pions opposite a jet, this particular measurement can be sensitive to the flavor of the struck parton. This measurement, which is dominated by the quark-gluon subprocess, can be divided into terms proportional to [Delta]u[Delta]g and [Delta]d[Delta]g. The relatively larger quark polarization amplifies the measured asymmetry thereby enhancing the statistical power. This thesis presents the result of the mid-rapidity pion+jet longitudinal double spin asymmetry analysis from 10.6 pb-1 of luminosity collected in the 2009 200 GeV p+p run.
Book Synopsis Measurements of the Double Helicity Asymmetry in Pion Production in Proton Collisions at [square Root Of] by :
Download or read book Measurements of the Double Helicity Asymmetry in Pion Production in Proton Collisions at [square Root Of] written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Longitudinal Double Spin Asymmetry for Inclusive Jet Production in Polarized Proton-proton Collisions at [square Root Of] S by : Julie Marie Millane
Download or read book Longitudinal Double Spin Asymmetry for Inclusive Jet Production in Polarized Proton-proton Collisions at [square Root Of] S written by Julie Marie Millane and published by . This book was released on 2008 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Inclusive Jet and Dijet Production in Polarized Proton-proton Collisions at [the Square Root of Sigma] by : Tai Sakuma
Download or read book Inclusive Jet and Dijet Production in Polarized Proton-proton Collisions at [the Square Root of Sigma] written by Tai Sakuma and published by . This book was released on 2010 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: The inclusive jet cross section, the dijet cross section, and the dijet longitudinal double spin asymmetry ALL in polarized proton-proton collisions at [square root of sigma] = 200 GeV are measured with a data sample of 5.4 pbm collected with the STAR detector during RHIC Run-6. The inclusive cross section is measured as a function of jet transverse momentum PT in the range of 10
Book Synopsis Dijet Production in Polarized Proton-proton Collisions at [the Square Root of Sigma] by : Matthew Hsing Hung Walker
Download or read book Dijet Production in Polarized Proton-proton Collisions at [the Square Root of Sigma] written by Matthew Hsing Hung Walker and published by . This book was released on 2011 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Longitudinal Double-spin Asymmetry of Forward Neutral Pions from 510 GeV Polarized Proton-proton Collisions at STAR. by : Christopher John Dilks
Download or read book Longitudinal Double-spin Asymmetry of Forward Neutral Pions from 510 GeV Polarized Proton-proton Collisions at STAR. written by Christopher John Dilks and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Longitudinal Double-spin Asymmetry and Cross Section for Inclusivejet Production in Polarized Proton Collisions at Sqrt(s) by :
Download or read book Longitudinal Double-spin Asymmetry and Cross Section for Inclusivejet Production in Polarized Proton Collisions at Sqrt(s) written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Measurement of Double-helicity Asymmetry and Search for Open Charm in Single-muon Production in Polarized Proton-proton Collisions by : Mikhail Stepanov
Download or read book Measurement of Double-helicity Asymmetry and Search for Open Charm in Single-muon Production in Polarized Proton-proton Collisions written by Mikhail Stepanov and published by . This book was released on 2009 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Longitudinal Double Spin Asymmetry for Dijet Production in Polarized Proton+Proton Collisions at Sqrt(s) by : Daniel L. Olvitt
Download or read book Measurement of the Longitudinal Double Spin Asymmetry for Dijet Production in Polarized Proton+Proton Collisions at Sqrt(s) written by Daniel L. Olvitt and published by . This book was released on 2017 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding what contributes to the intrinsic angular momentum (spin) of the proton has been a major goal of the nuclear physics community. In the 1980s, it was discovered that quarks contribute 30% to the spin of the proton. This information led to a search to find other contributions to the spin of the proton. At STAR, the double spin asymmetry (ALL) is measured as it is sensitive to the polarized gluon distribution (Dg(x)). The STAR 2009 inclusive jet ALL at sqrt(s) = 200 GeV has been incorporated into two independent global fits. These fits show for the first time a statistically significant non-zero gluon contribution to the spin of the proton in the parton momentum fraction range x > 0.05. Dijet ALL is also measured at STAR. Dijets are advantageous since the parton momentum fraction (x) of the initial partons may be reconstructed to first order from final state measurements. In 2013 STAR collected an estimated 250 pb-1 of data at sqrt(s) = 510 GeV. The higher center of mass energy will allow STAR to probe Dg(x) at x values as low as 0.02. The large statistics will allow a reduction in the uncertainties. Once the data is incorporated into future global fits, it will allow for a more precise determination of Dg(x). The 2013 dijet ALL results will be presented. The results show good agreement with both global fits and previous STAR results dijet measurements.
Book Synopsis Measurement of Direct Photon Production and Neutral Pion Double Helicity Asymmetry in Ultra Relativistic P+p Collisions by : Oliver Zaudtke
Download or read book Measurement of Direct Photon Production and Neutral Pion Double Helicity Asymmetry in Ultra Relativistic P+p Collisions written by Oliver Zaudtke and published by . This book was released on 2007 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Radiance of the Gluon Spin by : Michael Joseph Betancourt
Download or read book The Radiance of the Gluon Spin written by Michael Joseph Betancourt and published by . This book was released on 2012 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although fundamental to the observable universe, the proton is not elementary. Rather the particle is a bound state of three valence quarks and the QCD vacuum that condenses around them, its properties an amalgamation of those underlying degrees of freedom. Naive expectations presume that contributions from the valence quarks dominate these properties, but the deep inelastic scattering (DIS) experiments which first investigated the proton structure in detail revealed the importance of the vacuum. In particular, polarized DIS measurements uncovered a surprisingly inadequate quark polarization, necessitating significant contributions to the proton spin from elsewhere. The total spin of the gluon field confining the quarks is one possibility, but a contribution only weakly constrained by the electromagnetic probes of DIS. An observable far more sensitive to contributions from the gluon field can be found in the collision of two polarized protons. By correlating the incident proton helicities with final-states originating from an initial-state gluon, the double-helicity asymmetry directly probes the underlying gluon polarization and provides much stronger experimental constraints. Asymmetries measured with hadronic final-states have already improved the understanding of the proton spin structure significantly, but with accumulating statistics these measurements will eventually be limited by systematic uncertainties. Although direct photons are rare in the hadronic environment, the simplicity of the resulting asymmetry ultimately promises a more precise probe of the gluon polarization. Located at the Relativistic Heavy Ion Collider (RHIC), the only facility in the world capable of accelerating and colliding polarized proton beams, the Solenoidal Tracker at RHIC (STAR) provides the large acceptance electromagnetic calorimetry and charged particle tracking critical for measuring direct photons and, subsequently, their asymmetry. Utilizing data from the 2009 running period with intricate simulation, state-of-the-art statistical methods have been developed to tease out the rare photon signal from an overwhelming hadronic background to enable the first direct photon measurements at STAR. This thesis details the construction of the unpolarized cross section and an initial double-helicity asymmetry, proving the feasibility of the direct photon program at the experiment.
Download or read book רסיסים מהעבר הקרוב written by and published by . This book was released on 1938 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Forward Neutral Pion Transverse Single Spin Asymmetries in P+p Collisions at Sqrt S by :
Download or read book Forward Neutral Pion Transverse Single Spin Asymmetries in P+p Collisions at Sqrt S written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report precision measurements of the Feynman-x (x{sub F}) dependence, and first measurements of the transverse momentum (p{sub T}) dependence, of transverse single spin asymmetries for the production of [pi]° mesons from polarized proton collisions at √s = 200 GeV. The x{sub F} dependence of the results are in fair agreement with perturbative QCD (pQCD) model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the p{sub T} dependence at fixed x{sub F} are not consistent with these same pQCD-based calculations.
Book Synopsis Single Spin Asymmetry in J/[psi] Production from P + P, P + Al, and P + Au Collisions with Transversely Polarized Proton Beams at [square Root of (s_NN)] by : Chen Xu
Download or read book Single Spin Asymmetry in J/[psi] Production from P + P, P + Al, and P + Au Collisions with Transversely Polarized Proton Beams at [square Root of (s_NN)] written by Chen Xu and published by . This book was released on 2018 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Probing the Low-x Gluon Helicity Distribution with Dijet Double Spin Asymmetries in Polarized Proton Collisions at √s by : Suvarna Ramachandran
Download or read book Probing the Low-x Gluon Helicity Distribution with Dijet Double Spin Asymmetries in Polarized Proton Collisions at √s written by Suvarna Ramachandran and published by . This book was released on 2018 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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