Calculation of the QCD radiative corrections to helicity asymmetries in one-particle inclusive hadron processes

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5074982

Karasinski, P

Higher order QCD corrections to helicity asymmetries in high-p{perpendicular} one-particle inclusive hadron processes are analyzed in the framework of the parton model. First analytical expressions for {alpha}{sup 3} corrections to both helicity-averaged and helicity-dependent cross-sections for inclusive parton processes q{sub i}q{sub u} {yields} q{sub k}X, q{sub i}q{sub j} {yields} GX and q{sub i}q{sub j} {yields} q{sub k}X are obtained, where q{sub i} denotes quark with flavor i and G denotes a gluon. Next the corrections to helicity asymmetries for hadron processes resulting from these corrections are computed numerically. In the case of processes q{sub i}q{sub j} {yields} q{sub i}q{sub i}q{sub j} {yields} G and q{sub i}q{sub j} {yields} q{sub k}(k = i) the size of these corrections is small and weakly dependent on the choice of the renormalization scale {mu}{sup 2} and the factorization scale M{sup 2}. In the case of processes q{sub i}q{sub j} {yields} q{sub i} this size changes significantly with {mu}{sup 2} and M{sup 2}, and it can be made small by properly choosing these two mass scales. Based on this result we expect perturbative results for helicity asymmetries to be most reliable for scattering of two protons at large enough value of 2p{sup {perpendicular}}/{radical}S(p {sub {perpendicular}} being the transverse momentum of the detected hadron and S the CMS energy), where scattering of two valence quarks gives the major contribution to helicity asymmetries.

• Research Organization: Yale Univ., New Haven, CT (USA)
• OSTI ID: 5074982
• Country of Publication: United States
• Language: English

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