scholarly journals The First Transverse Single Spin Measurement in High Energy Polarized Proton-Nucleus Collision at the PHENIX experiment at RHIC

2016 ◽  
Vol 736 ◽  
pp. 012017 ◽  
Author(s):  
I. Nakagawa
Keyword(s):  
High Energy ◽  
Nucleus Collision ◽  
Single Spin ◽  
Phenix Experiment ◽  
Polarized Proton

scholarly journals SINGLE SPIN ASYMMETRY IN HIGH ENERGY QCD

2012 ◽  
Vol 20 ◽  
pp. 177-186
Author(s):  
YURI V. KOVCHEGOV ◽  
MATTHEW D. SIEVERT
Keyword(s):  
Wave Function ◽  
Light Cone ◽  
Spin Asymmetry ◽  
Production Cross ◽  
High Energy ◽  
Transverse Spin ◽  
Proton Proton ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Polarized Proton

We present the first steps in an effort to incorporate the physics of transverse spin asymmetries into the saturation formalism of high energy QCD. We consider a simple model in which a transversely polarized quark scatters on a proton or nuclear target. Using the light-cone perturbation theory the hadron production cross section can be written as a convolution of the light-cone wave function squared and the interaction with the target. To generate the single transverse spin asymmetry (STSA) either the wave function squared or the interaction with the target has to be T-odd. In this work we use the lowest-order q → q G wave function squared, which is T-even, generating the STSA from the T-odd interaction with the target mediated by an odderon exchange. We study the properties of the obtained STSA, some of which are in qualitative agreement with experiment: STSA increases with increasing projectile xF and is a non-monotonic function of the transverse momentum kT. Our mechanism predicts that the quark STSA in polarized proton–nucleus collisions should be much smaller than in polarized proton–proton collisions. We also observe that the STSA for prompt photons due to our mechanism is zero within the accuracy of the approximation.

Physics with a High Energy Polarized Proton Beam at Fermilab

1981 ◽  
pp. 489-496
Author(s):  
I. P. Auer ◽  
E. Colton ◽  
R. Ditzler ◽  
D. Hill ◽  
H. Spinka ◽  
...  
Keyword(s):  
Proton Beam ◽  
High Energy ◽  
Polarized Proton

scholarly journals PHENIX heavy flavor highlights

2020 ◽  
pp. 2040006
Author(s):  
Takashi Hachiya
Keyword(s):  
Perturbative Qcd ◽  
Semileptonic Decay ◽  
Large Mass ◽  
High Energy ◽  
Gluon Density ◽  
Experimental Results ◽  
Heavy Flavor ◽  
Phenix Experiment ◽  
Heavy Flavor Production

Heavy flavor production is a sensitive probe of the initial gluon density in the nucleon and is modified by the entire evolution of the hot quark and gluon medium created in high-energy nucleus–nucleus collisions. Besides, it is a process that can be calculated by perturbative QCD because of their large mass. The PHENIX experiment at RHIC studied the heavy flavor productions for a broad momentum and rapidity ranges using single leptons from the semileptonic decay of charm and bottom hadrons, and dileptons from [Formula: see text] decays in [Formula: see text], [Formula: see text]A, and Au [Formula: see text] Au collisions at [Formula: see text][Formula: see text]200[Formula: see text]GeV. In these proceedings, the recent experimental results in [Formula: see text], Au [Formula: see text] Au, and the small collision systems are presented and the heavy flavor productions and their modifications are discussed.

scholarly journals PHENIX Measurements of Heavy Flavor in Small Systems

2018 ◽  
Vol 172 ◽  
pp. 01001
Author(s):  
Alexandre Lebedev
Keyword(s):  
Dense Matter ◽  
High Energy ◽  
Heavy Flavor ◽  
Small Systems ◽  
Rapidity Range ◽  
Nuclear Collisions ◽  
Phenix Experiment ◽  
Heavy Flavor Production

The study of heavy flavor production in proton-nucleus and nucleus-nucleus collisions is a sensitive probe of the hot and dense matter created in such collisions. Installation of silicon vertex detectors in the PHENIX experiment, and increased performance of the BNL RHIC collider allowed collection of large amount of data on heavy flavor production in small colliding systems. In this talk we will present recent PHENIX results on open heavy flavor and quarkonia production in p+p, p+A, d+A, and He3+A colliding systems in a broad rapidity range, and discuss how these measurements help us to better understand all stages of nuclear collisions at high energy.

THE SCALING HYPOTHESES FOR SINGLE SPIN ASYMMETRY IN INCLUSIVE HADRON PRODUCTION

1999 ◽  
Vol 14 (02) ◽  
pp. 195-203
Author(s):  
E. A. ANDREEVA ◽  
V. A. OKOROKOV ◽  
M. N. STRIKHANOV ◽  
S. B. NURUSHEV
Keyword(s):  
Experimental Data ◽  
Scaling Laws ◽  
Spin Asymmetry ◽  
High Energy ◽  
Hadron Production ◽  
Single Spin Asymmetry ◽  
Firm Conclusion ◽  
Single Spin ◽  
Precise Data ◽  
Existing Data

Recently several scaling hypotheses were advocated for application to the single spin asymmetry in inclusive hadron production at high energy. We briefly review those hypotheses and confront them with published experimental data. We conclude that the existing data do not allow to make a firm conclusion on any of scaling laws proposed and more precise data with a wide kinematical coverage are required to establish or refute those hypotheses.

scholarly journals Physics Opportunities at a Photon–Photon Collider

2003 ◽  
Vol 18 (16) ◽  
pp. 2871-2892 ◽  
Author(s):  
Stanley J. Brodsky
Keyword(s):  
Deeply Virtual Compton Scattering ◽  
Virtual Compton Scattering ◽  
High Energy ◽  
Quadrupole Moments ◽  
Spin Asymmetries ◽  
Polarized Beams ◽  
Single Spin ◽  
Single Spin Asymmetries ◽  
Photon Collider ◽  
Electron Photon

The advent of back-scattered laser beams for e±e-colliders will allow detailed studies of a large array of high energy γγ and γe collision processes with polarized beams. These include tests of electroweak theory in photon-photon annihilation such as γγ → W+W-, γγ → Higgs bosons, and higher-order loop processes, such as γγ → γγ, Zγ, H0Z0and ZZ. Methods for measuring the anomalous magnetic and quadrupole moments of the W and Z gauge bosons to high precision in polarized electron-photon and photon-photon collisions are discussed. Since each photon can be resolved into a W+W-pair, high energy photon-photon collisions can also provide a remarkably background-free laboratory for studying WW collisions and annihilation. I also review high energy γγ and eγ tests of quantum chromodynamics, including the production of two gluon jets in photon-photon collisions, deeply virtual Compton scattering on a photon target, and leading-twist single-spin asymmetries for a photon polarized normal to a production plane. Exclusive hadron production processes in photon-photon collisions provide important tests of QCD at the amplitude level, particularly as measures of hadron distribution amplitudes which are also important for the analysis of exclusive semi-leptonic and two-body hadronic B-decays.

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