scholarly journals Transverse-spin and transverse-momentum effects in high-energy processes

2010 ◽  
Vol 65 (2) ◽  
pp. 267-333 ◽  
Author(s):  
Vincenzo Barone ◽  
Franco Bradamante ◽  
Anna Martin
Keyword(s):  
Transverse Momentum ◽  
High Energy ◽  
Transverse Spin ◽  
Energy Processes

scholarly journals Gluon transverse momentum dependent correlators in polarized high energy processes

2016 ◽  
Author(s):  
Piet Mulders ◽  
Daniel Boer ◽  
Sabrina Cotogno ◽  
Tom van Daal ◽  
Andrea Signori ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
High Energy ◽  
Transverse Momentum Dependent ◽  
Energy Processes

scholarly journals GENERALIZED UNIVERSALITY FOR TMD DISTRIBUTION FUNCTIONS

2012 ◽  
Vol 20 ◽  
pp. 66-74 ◽  
Author(s):  
M. G. A. BUFFING ◽  
P. J. MULDERS
Keyword(s):  
Transverse Momentum ◽  
Parton Distribution ◽  
Azimuthal Angle ◽  
High Energy ◽  
Distribution Functions ◽  
Transverse Spin ◽  
Parton Distribution Functions ◽  
Transverse Momentum Dependent ◽  
Spin Asymmetries ◽  
Azimuthal Asymmetries

Azimuthal asymmetries in high-energy processes, most pronounced showing up in combination with single or double (transverse) spin asymmetries, can be understood with the help of transverse momentum dependent (TMD) parton distribution and fragmentation functions. These appear in correlators containing expectation values of quark and gluon operators. TMDs allow access to new operators as compared to collinear (transverse momentum integrated) correlators. These operators include nontrivial process dependent Wilson lines breaking universality for TMDs. Making an angular decomposition in the azimuthal angle, we define a set of universal TMDs of definite rank, which appear with process dependent gluonic pole factors in a way similar to the sign of T-odd parton distribution functions in deep inelastic scattering or the Drell-Yan process. In particular, we show that for a spin 1/2 quark target there are three pretzelocity functions.

Laser breakdown in crystalline argon as model of fast high-energy processes

1979 ◽  
Vol 9 (1) ◽  
pp. 48-51
Author(s):  
I I Ashmarin ◽  
A I Andreev ◽  
Yu A Bykovskiĭ ◽  
V A Gridin ◽  
Ya Yu Zysin
Keyword(s):  
High Energy ◽  
Laser Breakdown ◽  
Energy Processes

BESSEL-WEIGHTED ASYMMETRIES AND TRANSVERSE SPIN EFFECTS

2012 ◽  
Vol 20 ◽  
pp. 168-176
Author(s):  
LEONARD GAMBERG
Keyword(s):  
Transverse Momentum ◽  
Cross Section ◽  
Parton Distribution ◽  
Evolution Equations ◽  
Distribution Functions ◽  
Transverse Spin ◽  
High Transverse Momentum ◽  
Transverse Momentum Dependent ◽  
Fragmentation Functions ◽  
The Cross

We consider the cross section for semi-inclusive deep inelastic scattering in Fourier space, conjugate to the outgoing hadron's transverse momentum, where convolutions of transverse momentum dependent parton distribution functions and fragmentation functions become simple products. Individual asymmetric terms in the cross section can be projected out by means of a generalized set of weights involving Bessel functions. Advantages of employing these Bessel weights are that they suppress (divergent) contributions from high transverse momentum and that soft factors cancel in (Bessel-) weighted asymmetries. Also, the resulting compact expressions immediately connect to previous work on evolution equations for transverse momentum dependent parton distribution and fragmentation functions and to quantities accessible in lattice QCD. Bessel-weighted asymmetries are thus model independent observables that augment the description and our understanding of correlations of spin and momentum in nucleon structure.

A model of a solar flare: Comparisons with observations of high-energy processes

2006 ◽  
Vol 50 (10) ◽  
pp. 842-850 ◽  
Author(s):  
A. I. Podgorny ◽  
I. M. Podgorny
Keyword(s):  
Solar Flare ◽  
High Energy ◽  
Energy Processes
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