Measurement Of The Double Longitudinal Spin Asymmetry In Inclusive Jet Production In Polarized P P Collisions At Su PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Measurement Of The Double Longitudinal Spin Asymmetry In Inclusive Jet Production In Polarized P P Collisions At Su PDF full book. Access full book title Measurement Of The Double Longitudinal Spin Asymmetry In Inclusive Jet Production In Polarized P P Collisions At Su.
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2015 |
| Genre | : |
| ISBN | : |
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 | : |
| Publisher | : |
| Total Pages | : |
| Release | : 1938 |
| Genre | : |
| ISBN | : |
Download רסיסים מהעבר הקרוב Book in PDF, ePub and Kindle
| Author | : |
| Publisher | : |
| Total Pages | : 3 |
| Release | : 2005 |
| Genre | : |
| ISBN | : |
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
| Author | : STAR Collaboration |
| Publisher | : |
| Total Pages | : |
| Release | : 2006 |
| Genre | : |
| ISBN | : |
Download Longitudinal Double Spin Asymmetry in Inclusive Jet Production AtSTAR. Book in PDF, ePub and Kindle
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
| Author | : Julie Marie Millane |
| Publisher | : |
| Total Pages | : 204 |
| Release | : 2008 |
| Genre | : |
| ISBN | : |
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
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2006 |
| Genre | : |
| ISBN | : |
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
| Author | : Daniel L. Olvitt |
| Publisher | : |
| Total Pages | : 147 |
| Release | : 2017 |
| Genre | : |
| ISBN | : |
Download Measurement of the Longitudinal Double Spin Asymmetry for Dijet Production in Polarized Proton+Proton Collisions at Sqrt(s) Book in PDF, ePub and Kindle
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.
| Author | : Alan Michael Hoffman |
| Publisher | : |
| Total Pages | : 126 |
| Release | : 2009 |
| Genre | : |
| ISBN | : |
Download Longitudinal Double-spin Asymmetry and Cross Section for Inclusive Neutral Pion Production in Polarized Proton Collisions at [the Square Root of Sigma] Book in PDF, ePub and Kindle
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].
| Author | : Yuxi Pan |
| Publisher | : |
| Total Pages | : 129 |
| Release | : 2015 |
| Genre | : |
| ISBN | : |
Download Measurement of Transverse Single Spin Asymmetries for Pi0 and Jets at Large XF in Square Root of S Book in PDF, ePub and Kindle
Asymmetries in the production of final state particles from collider or fixed-target experiments with polarized beams or target could provide valuable information on the spin structure of the nucleon. Transverse and longitudinal spin asymmetry measurements are complementary approaches for probing the nucleon spin structure functions and understanding the QCD dynamics for such phenomena, due to the non-commutative nature of boosts and rotations in relativistic regime. The research presented in this thesis focuses on characterizing the Transverse Single Spin Asymmetries (TSSA) of inclusive pi0 and jet productions in polarized proton collisions at large Feynman (xF) region. Theoretically these observables are explained by means of collinear twist-3 multi-parton correlations. In this picture the asymmetries originate from initial-state twist-3 parton distributions in the polarized proton and/or through the coupling between proton's initial-state transversity distribution and the final-state twist-3 fragmentation functions. The measurement of SSA for forward inclusive pi0 produced in pp collisions up to high transverse momentum helps examine the validity and interplay of these initial- and final-state models. These models can be further explored by investigating the dependence of the TSSA on event topologies. This thesis presents the STAR measurement of TSSA for forward inclusive pi0 at $2.8
| Author | : James Prewitt Hays-Wehle |
| Publisher | : |
| Total Pages | : 83 |
| Release | : 2013 |
| Genre | : |
| ISBN | : |
Download Measurement of Double Longitudinal Spin Asymmetry of Jet-[pi] +/- Correlations in Polarized Proton-proton Collisions at [square Root Of] S Book in PDF, ePub and Kindle
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.
