Bessel-weighted asymmetries and the Sivers effect
Conference
·
· Proceedings of Science
OSTI ID:1049371
We consider the cross section 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.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177; FG02-07ER41460
- OSTI ID:
- 1049371
- Report Number(s):
- JLAB-THY-12-1608; DOE/OR/23177-2303
- Conference Information:
- Journal Name: Proceedings of Science Journal Volume: QNP2012
- Country of Publication:
- United States
- Language:
- English
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