scholarly journals Study of Proton Helicity Structure in Polarized p + p Collisions at PHENIX

2007 ◽  
Author(s):  
Kensuke Okada
Keyword(s):  
Helicity Structure

scholarly journals Determining the helicity structure of the nucleon at the Electron Ion Collider in China

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Daniele Paolo Anderle ◽  
Tie-Jiun Hou ◽  
Hongxi Xing ◽  
Mengshi Yan ◽  
C.-P. Yuan ◽  
...  
Keyword(s):  
Electron Beam ◽  
Inelastic Scattering ◽  
Scattering Data ◽  
Leading Order ◽  
Specific Topic ◽  
Good Separation ◽  
Effective Electron ◽  
Deep Inelastic Scattering Data ◽  
Polarized Proton ◽  
Helicity Structure

Abstract Understanding how sea quarks behave inside a nucleon is one of the most important physics goals of the proposed Electron-Ion Collider in China (EicC), which is designed to have a 3.5 GeV polarized electron beam (80% polarization) colliding with a 20 GeV polarized proton beam (70% polarization) at instantaneous luminosity of 2 × 1033cm−2s−1. A specific topic at EicC is to understand the polarization of individual quarks inside a longitudinally polarized nucleon. The potential of various future EicC data, including the inclusive and semi-inclusive deep inelastic scattering data from both doubly polarized electron-proton and electron-3He collisions, to reduce the uncertainties of parton helicity distributions is explored at the next-to-leading order in QCD, using the Error PDF Updating Method Package (ePump) which is based on the Hessian profiling method. We show that the semi-inclusive data are well able to provide good separation between flavour distributions, and to constrain their uncertainties in the x > 0.005 region, especially when electron-3He collisions, acting as effective electron-neutron collisions, are taken into account. To enable this study, we have generated a Hessian representation of the DSSV14 set of PDF replicas, named DSSV14H PDFs.

scholarly journals MHV amplitudes and BCFW recursion for Yang-Mills theory in the de Sitter static patch

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Emil Albrychiewicz ◽  
Yasha Neiman ◽  
Mirian Tsulaia
Keyword(s):  
Scattering Problem ◽  
The Other ◽  
Tree Level ◽  
De Sitter ◽  
Recursion Relations ◽  
Yang Mills ◽  
The Past ◽  
Infinite Set ◽  
Mills Field ◽  
Helicity Structure

Abstract We study the scattering problem in the static patch of de Sitter space, i.e. the problem of field evolution between the past and future horizons of a de Sitter observer. We formulate the problem in terms of off-shell fields in Poincare coordinates. This is especially convenient for conformal theories, where the static patch can be viewed as a flat causal diamond, with one tip at the origin and the other at timelike infinity. As an important example, we consider Yang-Mills theory at tree level. We find that static-patch scattering for Yang-Mills is subject to BCFW-like recursion relations. These can reduce any static-patch amplitude to one with N−1MHV helicity structure, dressed by ordinary Minkowski amplitudes. We derive all the N−1MHV static-patch amplitudes from self-dual Yang-Mills field solutions. Using the recursion relations, we then derive from these an infinite set of MHV amplitudes, with arbitrary number of external legs.

HELICITY STRUCTURE OF BARYON RESONANCES

GDH 2000 ◽  
2001 ◽  
Author(s):  
A. BISELLI ◽  
R. DAVIDSON ◽  
PAUL STOLER
Keyword(s):  
Baryon Resonances ◽  
Helicity Structure

scholarly journals Pion helicity structure and its consequences for the hard scattering form factor

1996 ◽  
Vol 54 (9) ◽  
pp. 5890-5893 ◽  
Author(s):  
S. W. Wang ◽  
L. S. Kisslinger
Keyword(s):  
Form Factor ◽  
Hard Scattering ◽  
Helicity Structure
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