نتایج جستجو برای: 2 and 3 twist
تعداد نتایج: 17390696 فیلتر نتایج به سال:
Ab initio calculation at HF/6-31G* level of theory for geometry optimization and MP2/6-31G*//HF/6-31G* for a single point total energy calculation are reported for the important energyminimumconformations and transition-state geometries of of cyclodeca-1,2,3-triene (1). The mostfavorable conformation of 1 is a unsymmetrical twist-chair (1-TC) structure. Degenerateinterconversion of 1-TC with it...
We review the possibility to use the renormalons emerging in the perturbation series of the twist-2 part of the nonsinglet structure functions F L , F 2 , F 3 , and g 1 to make approximate predictions for the magnitude of the appertaining twist-4 corrections.
We have measured proton and deuteron virtual photon-nucleon asymmetries A p 2 and A d 2 and structure functions g p 2 and g d 2 over the range 0:03 < x < 0:8 and 1:3 < Q 2 < 10 (GeV/c) 2 by inelastically scattering polarized electrons oo polarized ammonia targets. Results for A 2 are signiicantly smaller than the positivity limit p R for both targets. Within experimental precision the g 2 data ...
We review the nucleon’s twist-3 polarized structure functions from the viewpoint of gauge invariant, nonlocal light-cone operators in QCD. We discuss a systematic treatment of the polarized structure functions and the corresponding parton distribution functions. We emphasize unique features of higher twist distributions, and the role of the QCD equations of motion to derive their anomalous dime...
The longitudinal-transverse spin asymmetry ALT in the polarized Drell-Yan process depends on twist-3 quark distributions of nucleon. In addition to the contributions associated with the twist-3 operators, these distributions contain the “Wandzura-Wilczek (WW)” part, which is determined by a certain integral of twist-2 distributions. The recently obtained empirical information on the transversit...
We show possible transverse-momentum-dependent parton distribution functions (TMDs) for spin-1 hadrons including twist-3 and 4 in addition to the leading twist-2 ones by investigating all decomposition of a quark correlation function Lorentz-invariant way. The Hermiticity parity invariance are imposed decomposition; however, time-reversal is not used due an active role gauge links TMDs. Therefo...
The longitudinal-transverse spin asymmetry ALT in the polarized Drell-Yan process depends on the twist-3 spin-dependent distributions of nucleon. In addition to the contributions expressed as matrix element of the twist-3 operators, these distributions contain the so-called Wandzura-Wilczek part, which is completely determined by a certain integral of the twist-2 spin-dependent parton distribut...
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