scholarly journals Interference fragmentation functions and valence quark spin distributions in the nucleon

1998 ◽  
Vol 57 (9) ◽  
pp. 5920-5922 ◽  
Author(s):  
R. L. Jaffe ◽  
Xuemin Jin ◽  
Jian Tang
Keyword(s):  
Valence Quark ◽  
Quark Spin ◽  
Fragmentation Functions ◽  
Spin Distributions

EXTRACTING GLUON FRAGMENTATION FUNCTIONS IN HADRON-HADRON COLLISIONS

1989 ◽  
Vol 04 (06) ◽  
pp. 1485-1491
Author(s):  
DONGSHENG DU ◽  
YUZHEN GE ◽  
MA LUO
Keyword(s):  
Valence Quark ◽  
Quark Distribution ◽  
Structure Functions ◽  
Distribution Functions ◽  
Pp Collisions ◽  
Fragmentation Functions ◽  
Gluon Fragmentation ◽  
Better Than

Two methods for extracting gluon fragmentation functions in π±p, [Formula: see text] and pp collisions are proposed. The only inputs are valence-quark distribution functions which we know much better than other structure functions and fragmentation functions. So better extraction of gluon fragmentation functions can be obtained.

scholarly journals Quark Spin-Orbit Correlations

2015 ◽  
Vol 37 ◽  
pp. 1560036 ◽  
Author(s):  
Cédric Lorcé
Keyword(s):  
Angular Momentum ◽  
Phase Space ◽  
Orbital Angular Momentum ◽  
Valence Quark ◽  
Complete Characterization ◽  
Proton Spin ◽  
Spin Orbit ◽  
Parton Distributions ◽  
Transverse Momentum Dependent ◽  
Quark Spin

The proton spin puzzle issue focused the attention on the parton spin and orbital angular momentum contributions to the proton spin. However, a complete characterization of the proton spin structure requires also the knowledge of the parton spin-orbit correlation. We showed that this quantity can be expressed in terms of moments of measurable parton distributions. Using the available phenomenological information about the valence quarks, we concluded that this correlation is negative, meaning that the valence quark spin and kinetic orbital angular momentum are, in average, opposite. The quark spin-orbit correlation can also be expressed more intuitively in terms of relativistic phase-space distributions, which can be seen as the mother distributions of the standard generalized and transverse-momentum dependent parton distributions. We present here for the first time some examples of the general multipole decomposition of these phase-space distributions.

scholarly journals Measurements of the u valence quark distribution function in the proton and u quark fragmentation functions

1989 ◽  
Vol 321 (3) ◽  
pp. 541-560 ◽  
Author(s):  
M. Arneodo ◽  
A. Arvidson ◽  
J.J. Aubert ◽  
B. Badelek ◽  
J. Beaufays ◽  
...  
Keyword(s):  
Distribution Function ◽  
Valence Quark ◽  
Quark Distribution ◽  
Quark Fragmentation ◽  
Fragmentation Functions ◽  
Quark Distribution Function

The valence and strange-sea quark spin distributions in the nucleon from semi-inclusive deep inelastic lepton scattering

1989 ◽  
Vol 230 (1-2) ◽  
pp. 141-148 ◽  
Author(s):  
Leonid L. Frankfurt ◽  
Mark I. Strikman ◽  
Lech Mankiewicz ◽  
Andreas Schäfer ◽  
Ewa Rondio ◽  
...  
Keyword(s):  
Quark Spin ◽  
Spin Distributions

scholarly journals The quark spin distributions of the nucleon

1998 ◽  
Vol 441 (1-4) ◽  
pp. 461-467 ◽  
Author(s):  
Bo-Qiang Ma ◽  
Ivan Schmidt ◽  
Jacques Soffer
Keyword(s):  
Quark Spin ◽  
Spin Distributions

EXPERIMENTAL DATA ON TRANSVERSE-MOMENTUM DISTRIBUTIONS FROM SEMI-INCLUSIVE DEEP-INELASTIC SCATTERING

2014 ◽  
Vol 25 ◽  
pp. 1460013
Author(s):  
GUNAR SCHNELL
Keyword(s):  
Transverse Momentum ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
The Novel ◽  
Parton Distributions ◽  
Transverse Momentum Dependent ◽  
Quark Spin ◽  
Momentum Distributions ◽  
Sivers Function ◽  
Fragmentation Functions

The exploration of the structure of the nucleon reaches a new level of sophistication when explicit dependences on transverse momenta of partons in both parton distributions and fragmentation functions are included. These dependences lead to a manifold of new correlations between the nucleon and quark spin as well as their momenta and thus a wealth of experimental observables. A particular example is the novel Sivers function that—according to firm QCD predictions—has to change sign when going from the Drell-Yan process to semi-inclusive deep-inelastic scattering. Here a review is given on which knowledge has been gathered about transverse-momentum-dependent (TMD) distribution and fragmentation functions from semi-inclusive deep-inelastic scattering experiments.

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