Gauge-invariant TMD factorization for Drell-Yan hadronic tensor at small x
Abstract The Drell-Yan hadronic tensor for electromagnetic (EM) current is calculated in the Sudakov region s ≫ Q 2 ≫ q ⊥ 2 $$ s\gg {Q}^2\gg {q}_{\perp}^2 $$ with 1 Q 2 $$ \frac{1}{Q^2} $$ accuracy, first at the tree level and then with the double-log accuracy. It is demonstrated that in the leading...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-05-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP05(2021)046 |
| Summary: | Abstract The Drell-Yan hadronic tensor for electromagnetic (EM) current is calculated in the Sudakov region s ≫ Q 2 ≫ q ⊥ 2 $$ s\gg {Q}^2\gg {q}_{\perp}^2 $$ with 1 Q 2 $$ \frac{1}{Q^2} $$ accuracy, first at the tree level and then with the double-log accuracy. It is demonstrated that in the leading order in N c the higher-twist quark-quark-gluon TMDs reduce to leading-twist TMDs due to QCD equation of motion. The resulting tensor for unpolarized hadrons is EM gauge-invariant and depends on two leading-twist TMDs: f 1 responsible for total DY cross section, and Boer-Mulders function h 1 ⊥ $$ {h}_1^{\perp } $$ . The order-of-magnitude estimates of angular distributions for DY process seem to agree with LHC results at corresponding kinematics. |
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| ISSN: | 1029-8479 |