Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-11-18
Phys.Lett. B584 (2004) 276-284
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 4 eps figures, elsart.cls, typos corrected. To be published in Physics Letters B
Scientific paper
10.1016/j.physletb.2004.01.054
We consider a sub-leading twist chiral-odd pion fragmentation function and explore its contribution in single pion semi-inclusive electroproduction. We evaluate the single beam-spin azimuthal asymmetry $A_{LU}$ and the double spin asymmetry $A_{LT}$ in polarized electroproduction of pions from an unpolarized and transversely polarized nucleon respectively. The beam asymmetry is expressed as the product of chiral-odd, and $T$-odd and even distribution and fragmentation functions. The double spin asymmetry contains information on the quark's transversity distribution. In a quark diquark-spectator framework we estimate these asymmetries at $6 {\rm GeV}$, $ 12 {\rm GeV}$, and $27.5 {\rm GeV}$ energies.
Gamberg Leonard P.
Hwang Dae Sung
Oganessyan Karo A.
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