scholarly journals Exploring twist-2 GPDs through quasidistributions in a diquark spectator model

2020 ◽  
Vol 102 (5) ◽  
Author(s):  
Shohini Bhattacharya ◽  
Christopher Cocuzza ◽  
Andreas Metz
Keyword(s):  
Spectator Model

Participant–Spectator Model for Fragmentation Reactions with Halo Nuclei

2003 ◽  
Vol 18 (2-4) ◽  
pp. 203-208
Author(s):  
D.V. Fedorov ◽  
A.S. Jensen ◽  
E. Garrido
Keyword(s):  
Halo Nuclei ◽  
Fragmentation Reactions ◽  
Spectator Model

scholarly journals Quark and Gluon Spin Dependent GPDs in a Flexible Spectator Model for Deeply Virtual Lepton Scattering Processes

2018 ◽  
Author(s):  
Gary R. Goldstein ◽  
Simonetta Liuti ◽  
O.J. Gonzalez-Hernandez
Keyword(s):  
Gluon Spin ◽  
Spectator Model

scholarly journals Autoionization of the Ca 2p53d core resonances: Breakdown of the spectator model

1989 ◽  
Vol 39 (8) ◽  
pp. 4319-4322 ◽  
Author(s):  
M. Meyer ◽  
E. v. Raven ◽  
M. Richter ◽  
B. Sonntag ◽  
R. D. Cowan ◽  
...  
Keyword(s):  
The Spectator ◽  
Spectator Model

scholarly journals Weighted azimuthal asymmetries in a diquark spectator model

2010 ◽  
Vol 45 (3) ◽  
pp. 373-388 ◽  
Author(s):  
A. Bacchetta ◽  
M. Radici ◽  
F. Conti ◽  
M. Guagnelli
Keyword(s):  
Azimuthal Asymmetries ◽  
Spectator Model

scholarly journals Colour unwound - disentangling colours for azimuthal asymmetries in Drell-Yan scattering

2017 ◽  
Vol 3 (6) ◽  
Author(s):  
Daniël Boer ◽  
Tom van Daal ◽  
Jonathan Gaunt ◽  
Tomas Kasemets ◽  
Piet Mulders
Keyword(s):  
Transverse Momentum ◽  
Cross Section ◽  
Distribution Functions ◽  
Transverse Momentum Dependent ◽  
Gluon Vertex ◽  
Gluon Exchange ◽  
Azimuthal Asymmetries ◽  
The Given ◽  
Spectator Model

It has been suggested that a colour-entanglement effect exists in the Drell-Yan cross section for the ‘double T-odd’ contributions at low transverse momentum \bm{Q_\st}, rendering the colour structure different from that predicted by the usual factorisation formula . These T-odd contributions can come from the Boer-Mulders or Sivers transverse momentum dependent distribution functions. The different colour structure should be visible already at the lowest possible order that gives a contribution to the double Boer-Mulders (dBM) or double Sivers (dS) effect, that is at the level of two gluon exchanges. To discriminate between the different predictions, we compute the leading-power contribution to the low-\bm{Q_\st} dBM cross section at the two-gluon exchange order in the context of a spectator model. The computation is performed using a method of regions analysis with Collins subtraction terms implemented. The results conform with the predictions of the factorisation formula. In the cancellation of the colour entanglement, diagrams containing the three-gluon vertex are essential. Furthermore, the Glauber region turns out to play an important role – in fact, it is possible to assign the full contribution to the dBM cross section at the given order to the region in which the two gluons have Glauber scaling. A similar disentanglement of colour is found for the dS effect.

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