scholarly journals Gluon Sivers function in a light-cone spectator model

2016 ◽  
Vol 94 (9) ◽  
Author(s):  
Zhun Lu ◽  
Bo-Qiang Ma
Keyword(s):  
Light Cone ◽  
Sivers Function ◽  
Spectator Model

scholarly journals Quark Angular Momentum and Gravitational Form Factors

2016 ◽  
Vol 40 ◽  
pp. 1660054 ◽  
Author(s):  
Tianbo Liu ◽  
Bo-Qiang Ma
Keyword(s):  
Angular Momentum ◽  
Gauge Field ◽  
Light Cone ◽  
Total Angular Momentum ◽  
Field Model ◽  
Axial Vector ◽  
Form Factors ◽  
Momentum Fraction ◽  
Sum Rule ◽  
Spectator Model

We investigate the quark angular momentum in a light-cone spectator model. The canonical angular momentum sum rule is satisfied in both the scalar and the axial-vector cases. Then we perform a calculation of the gravitational form factors which are expected to be related to the angular momentum of each constituent in this no gauge field model. We find this relation is satisfied for the total angular momentum as a direct conclusion of the momentum fraction sum rule and the anomalous gravitomagnetic moment sum rule, but for each constituent it is violated.

scholarly journals Sivers function in a spectator model with axial-vector diquarks

2004 ◽  
Vol 578 (1-2) ◽  
pp. 109-118 ◽  
Author(s):  
Alessandro Bacchetta ◽  
Andreas Schäfer ◽  
Jian-Jun Yang
Keyword(s):  
Axial Vector ◽  
Sivers Function ◽  
Spectator Model

Light-cone QCD on the lattice

2000 ◽  
Vol 83-84 (1-3) ◽  
pp. 116-120 ◽  
Author(s):  
S Dalley
Keyword(s):  
Light Cone

scholarly journals Gluon Sivers function and transverse single spin asymmetries in e+p↑→γ+X

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
Siddhesh Padval ◽  
Rohini M. Godbole ◽  
Abhiram Kaushik ◽  
Anuradha Misra ◽  
Vaibhav S. Rawoot
Keyword(s):  
Spin Asymmetries ◽  
Single Spin ◽  
Single Spin Asymmetries ◽  
Sivers Function

scholarly journals Reweighting the Sivers function with jet data from STAR

2021 ◽  
Vol 815 ◽  
pp. 136135
Author(s):  
M. Boglione ◽  
U. D'Alesio ◽  
C. Flore ◽  
J.O. Gonzalez-Hernandez ◽  
F. Murgia ◽  
...  
Keyword(s):  
Sivers Function

scholarly journals Light-cone sum rules for proton decay

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Ulrich Haisch ◽  
Amando Hala
Keyword(s):  
Lattice Qcd ◽  
Light Cone ◽  
Sum Rules ◽  
State Of The Art ◽  
Form Factors ◽  
Baryon Number ◽  
Proton Decay ◽  
Matrix Elements ◽  
Decay Channels ◽  
Systematic Uncertainties

Abstract We estimate the form factors that parametrise the hadronic matrix elements of proton-to-pion transitions with the help of light-cone sum rules. These form factors are relevant for semi-leptonic proton decay channels induced by baryon-number violating dimension-six operators, as typically studied in the context of grand unified theories. We calculate the form factors in a kinematical regime where the momentum transfer from the proton to the pion is space-like and extrapolate our final results to the regime that is relevant for proton decay. In this way, we obtain estimates for the form factors that show agreement with the state-of-the-art calculations in lattice QCD, if systematic uncertainties are taken into account. Our work is a first step towards calculating more involved proton decay channels where lattice QCD results are not available at present.

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