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Transverse Single Spin Asymmetries In Heavy Flavor Production In Polarized P P Collisions At Square Root Symbol 8
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Book Synopsis Transverse Single Spin Asymmetries in Heavy Flavor Production in Polarized P+p Collisions at [square Root Symbol] 8 by : Hisham Albataineh
Download or read book Transverse Single Spin Asymmetries in Heavy Flavor Production in Polarized P+p Collisions at [square Root Symbol] 8 written by Hisham Albataineh and published by . This book was released on 2009 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Transverse Single Spin Asymmetries for Pi0 and Jets at Large XF in Square Root of S by : Yuxi Pan
Download or read book Measurement of Transverse Single Spin Asymmetries for Pi0 and Jets at Large XF in Square Root of S written by Yuxi Pan and published by . This book was released on 2015 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
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 Measurement of Transverse Single-Spin Asymmetries for Di-JetProduction in Proton-Proton Collisions at Sqrt S by :
Download or read book Measurement of Transverse Single-Spin Asymmetries for Di-JetProduction in Proton-Proton Collisions at Sqrt S written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the first measurement of the opening angledistribution between pairs of jets produced in high-energy collisions oftransversely polarized protons. The measurement probes (Sivers)correlations between the transverse spin orientation of a proton and thetransverse momentum directions of its partons. With both beams polarized, the wide pseudorapidity ( -1 leq eta leq +2) coverage for jets permitsseparation of Sivers functions for the valence and sea regions. Theresulting asymmetries are all consistent with zero and considerablysmaller than Sivers effects observed in semi-inclusive deep inelasticscattering (SIDIS). We discuss theoretical attempts to reconcile the newresults with the sizable transverse spin effects seen in SIDIS andforward hadron production in pp collisions.
Book Synopsis Measurement of the Transverse Single Spin Asymmetry and the Invariant Cross Section of Inclusive Eta Mesons Produced from Transversely Polarized Proton-Proton Collisions at Center of Mass Energy of 200 GeV by : David William Kleinjan
Download or read book Measurement of the Transverse Single Spin Asymmetry and the Invariant Cross Section of Inclusive Eta Mesons Produced from Transversely Polarized Proton-Proton Collisions at Center of Mass Energy of 200 GeV written by David William Kleinjan and published by . This book was released on 2014 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurement of transverse single spin asymmetries provides insight into the structure of the nucleon. Originally expected to be small, results from PHENIX and other experiments show significant asymmetries in the forward momentum direction of the polarized proton over a wide range of center-of-mass energies. Several mechanisms have been proposed that attempt to explain these asymmetries, which include initial and final state effects based on transverse momentum dependent distributions and perturbative Quantum Chromodynamic (pQCD) calculations at higher twist. Studying the species, and the kinematic dependencies of these transverse single spin asymmetries will help to disentangle the origin of the observed asymmetries. Using the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC), the transverse single spin asymmetry (A N ) of inclusive eta mesons produced from transversely polarized proton-proton collisions at center of mass energy of 200 GeV at forward rapidity is measured. In addition, the predictive power of pQCD to explain this asymmetry is tested via the measurement of the eta meson Cross Section.
Book Synopsis Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized P + P Collisions at [square Root] by : Katsuro Nakamura
Download or read book Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized P + P Collisions at [square Root] written by Katsuro Nakamura and published by . This book was released on 2014 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 Twist-three Fragmentation Function Contribution to the Single Spin Asymmetry in Pp Collisions by :
Download or read book Twist-three Fragmentation Function Contribution to the Single Spin Asymmetry in Pp Collisions written by and published by . This book was released on 2010 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: We study the twist-three fragmentation function contribution to the single transverse spin asymmetries in inclusive hadron production in pp collisions, pp->h+X. In particular, we evaluate the so-called derivative contribution which dominates the spin asymmetry in the forward direction of the polarized proton. With certain parametrizations for the twist-three fragmentation function, we estimate its contribution to the asymmetry of pi0 production at RHIC energy. We find that the contribution is sizable and might be responsible for the big difference between the asymmetries in eta and pi0 productions observed by the STAR collaboration at RHIC.
Book Synopsis Measurement of the Transverse Single-spin Asymmetry for Mid-rapidity Production of Neutral Pions in Polarized P+p Collisions at 200 GeV Center-of-mass Energy by : Christine Aidala
Download or read book Measurement of the Transverse Single-spin Asymmetry for Mid-rapidity Production of Neutral Pions in Polarized P+p Collisions at 200 GeV Center-of-mass Energy written by Christine Aidala and published by . This book was released on 2006 with total page 248 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 W Boson Cross Sections and Single Spin Asymmetries in Polarized Proton-proton Collisions at [square Root Of] S by : Ross Cameron Corliss
Download or read book W Boson Cross Sections and Single Spin Asymmetries in Polarized Proton-proton Collisions at [square Root Of] S written by Ross Cameron Corliss and published by . This book was released on 2012 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the structure of the proton is an ongoing effort in the particle physics community. Existing in the region of nonperturbative QCD, the various models for proton structure must be informed and constrained by experimental data. In 2009, the STAR experiment at Brookhaven National Lab recorded over 12 pb-1 of data from polarized p+p collisions at 500 GeV center-of-mass energy provided by the RHIC accelerator. This has offered a first look at the spin-dependent production of W+(-) bosons, and hence at the spin-flavor structure of the proton, where the main production mode is through d+u (u+d) annihilation. Using STAR's large Time Projection Chamber and its wide-acceptance electromagnetic calorimeters, it is possible to identify the e+ + v (e- + v) decay mode of the W bosons produced. This thesis presents the first STAR measurement of charge-separated W production, both the pseudorapidity-dependent ratio and the longitudinal single-spin asymmetry. These results show good agreement with theoretical expectations, validating the methods used and paving the way for the analysis of larger datasets that will be available soon. In the near future the range of this measurement will be augmented with the Forward GEM Tracker. A discussion of the design and implementation of this upgrade is also included, along with projections for its impact.
Book Synopsis Forward Di-hadron Asymmetries from P + P at 8́(s by : James Lucas Drachenberg
Download or read book Forward Di-hadron Asymmetries from P + P at 8́(s written by James Lucas Drachenberg and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One unresolved question in hadronic physics is the origin of large transverse single-spin asymmetries, AN, observed in hadron production from high-energy polarized-proton collisions. Collinear perturbative Quantum Chromodynamics (pQCD) predicts that AN should scale with the quark mass, however, experiments have since reported large AN for inclusive hadron production. Recent measurements from RHIC experiments show examples of these asymmetries at forward angles in a kinematic region where pQCD cross-section calculations reasonably agree with measured cross-sections. Disentangling dynamical contributions to AN from hadro-production requires moving beyond inclusive measurements. One possibility is to investigate asymmetries in two-particle correlations due to Interference Fragmentation Functions (IFF) and the Sivers effect. In 2008, RHIC dedicated a portion of the run to transversely polarized proton collisions at sqrt(s) = 200 GeV. STAR was equipped with a Foward Meson Spectrometer (FMS) and a Forward Time Projection Chamber (FTPC), overlapping in the pseudorapidity range of 2.5 eta & lt; 4. By analyzing neutral pions with the FMS correlated with charged particles from the FTPC, correlation asymmetries can be measured at kinematics where large inclusive asymmetries have been measured. Correlations are measured for pi^0's with 2 & lt; pT, pi^0 & lt; 5 GeV/c and associated charged particles in two ranges of transverse momentum: 1 & lt; pT, ch & lt; 2 GeV/c and 0.5 & lt; pT, ch & lt; 1 GeV/c. IFF and Sivers asymmetries manifest themselves through the correlation of two particles from the same jet. These events are selected through a cut on the pair radius, delta R. Gain non-uniformities and electronics failures have resulted in large holes in trigger acceptance and associated particle acceptance, respectively. This non-uniform acceptance allows the Sivers and IFF effects to mix and distort the raw asymmetries. Techniques are developed to measure this leak-through by means of unpolarized yields and event weighting. They result in small corrections to the asymmetries. IFF and Sivers asymmetries both for xF 0 and for xF & lt; 0 are reported for forward-angle pi^0-charged particle correlations from polarized-proton collisions at sqrt(s) = 200 GeV. Asymmetries are shown corrected for full underlying-event and pileup backgrounds, as well as corrected only for pile-up contributions. It appears the asymmetries are less sensitive to delta R when corrected for the full underlying-event background. Unfortunately, statistics limitations preclude a firm conclusion.
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 Asymmetries for Dijet Production at Intermediate Pseudorapidity in Polarized P+P Collisions at Square Root of S by : Joseph H. Kwasizur
Download or read book Longitudinal Double-spin Asymmetries for Dijet Production at Intermediate Pseudorapidity in Polarized P+P Collisions at Square Root of S written by Joseph H. Kwasizur and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Double-spin Asymmetry of J/[psi] Production in Polarized Pp-collisions at HERA-N by : O. V. Terjaev
Download or read book Double-spin Asymmetry of J/[psi] Production in Polarized Pp-collisions at HERA-N written by O. V. Terjaev and published by . This book was released on 1996 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Assymmetry of Jet Production in Polarized Pp-collisions at RHIC and Sign of G by : G. P. Škoro
Download or read book Assymmetry of Jet Production in Polarized Pp-collisions at RHIC and Sign of G written by G. P. Škoro and published by . This book was released on 1998 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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