scholarly journals Longitudinal double-spin asymmetries for π0s in the forward direction for 510 GeV polarized pp collisions

2018 ◽  
Vol 98 (3) ◽  
Author(s):  
J. Adam ◽  
L. Adamczyk ◽  
J. R. Adams ◽  
J. K. Adkins ◽  
G. Agakishiev ◽  
...  
Keyword(s):  
Forward Direction ◽  
Pp Collisions ◽  
Spin Asymmetries ◽  
Double Spin

scholarly journals Longitudinal double-spin asymmetries for dijet production at intermediate pseudorapidity in polarized pp collisions at s=200  GeV

2018 ◽  
Vol 98 (3) ◽  
Author(s):  
J. Adam ◽  
L. Adamczyk ◽  
J. R. Adams ◽  
J. K. Adkins ◽  
G. Agakishiev ◽  
...  
Keyword(s):  
Pp Collisions ◽  
Dijet Production ◽  
Spin Asymmetries ◽  
Double Spin ◽  
200 Gev

Longitudinal Double-spin Asymmetries for π[sup 0] Production at Forward Rapidity in pp Collisions at s = 200 GeV at STAR

2009 ◽  
Author(s):  
Scott W. Wissink ◽  
Donald G. Crabb ◽  
Yelena Prok ◽  
Matt Poelker ◽  
Simonetta Liuti ◽  
...  
Keyword(s):  
Forward Rapidity ◽  
Pp Collisions ◽  
Spin Asymmetries ◽  
Double Spin ◽  
200 Gev

DOUBLE SPIN ASYMMETRY ALT IN THE PRODUCTION OF PHOTONS, HADRONS, AND JETS

2012 ◽  
Vol 20 ◽  
pp. 29-36
Author(s):  
DANIEL PITONYAK
Keyword(s):  
Spin Asymmetry ◽  
Pp Collisions ◽  
Proton Proton ◽  
Spin Asymmetries ◽  
Double Spin Asymmetry ◽  
Single Spin ◽  
Double Spin ◽  
Single Spin Asymmetries ◽  
Complete Set ◽  
First Time

We calculate the double spin asymmetry (DSA) ALT in proton-proton (pp) collisions for the production of photons, hadrons, and jets in the collinear twist-3 framework. These processes allows us for the first time to access a complete set of collinear twist-3 functions. We also give numerical estimates for the asymmetries of which photon production shows the most promise of a measurable effect. Furthermore, we comment on how these asymmetries would allow us to probe the gluon helicity down to as of yet unexplored x values, remark on the importance of these effects in determining the evolution of the Efremov-Teryaev-Qiu-Sterman (ETQS) function TF(x, x), and discuss their usefulness in resolving the true mechanism behind the large transverse single spin asymmetries (SSAs) measured in pp collisions.

MEASUREMENT OF POLARIZED QUARK DISTRIBUTIONS AT HERMES

2003 ◽  
Vol 18 (08) ◽  
pp. 1185-1192
Author(s):  
◽  
STEFAN BERNREUTHER
Keyword(s):  
Cross Section ◽  
Kinematic Range ◽  
Spin Asymmetries ◽  
Double Spin ◽  
Hermes Experiment ◽  
Down Quark ◽  
Up Quark ◽  
Rich Detector ◽  
The Individual ◽  
Quark Flavors

The HERMES experiment has measured double spin asymmetries in the cross section for deep–inelastic scattering of longitudinally polarized positrons on longitudinally polarized 3 He (1995), 1 H (1996/97), and 2 D (1998) targets. A kinematic range of 0.023 < x < 0.6, and 1 GeV 2 < Q2 < 15 GeV 2 has been covered. From these asymmetries, based on inclusive and semi–inclusive measurements, polarized quark distributions are extracted as a function of x for up [Formula: see text] and down [Formula: see text] flavors as well as for valence and sea quarks. In the measured range, the up quark polarization is positive while the down quark polarization is negative. The sea quark polarization is compatible with zero. In this analysis all sea quark polarizations have been assumed to be flavor symmetric. Presently HERMES is analyzing a high statistics 2 D data sample taken in 1999-2000. For these data it is possible to identify pions and kaons with a RICH detector which was installed in 1998. This will enable an extraction of the individual sea quark flavors [Formula: see text], [Formula: see text], and [Formula: see text] without any symmetry assumptions.

scholarly journals Double spin asymmetries through QCD instantons

2014 ◽  
Vol 90 (11) ◽  
Author(s):  
Yachao Qian ◽  
Ismail Zahed
Keyword(s):  
Spin Asymmetries ◽  
Double Spin

scholarly journals Target and double spin asymmetries of deeply virtual π0 production with a longitudinally polarized proton target and CLAS

2017 ◽  
Vol 768 ◽  
pp. 168-173 ◽  
Author(s):  
A. Kim ◽  
H. Avakian ◽  
V. Burkert ◽  
K. Joo ◽  
W. Kim ◽  
...  
Keyword(s):  
Proton Target ◽  
Spin Asymmetries ◽  
Double Spin ◽  
Polarized Proton ◽  
Polarized Proton Target
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