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- W2754013412 abstract "It has been suggested that a colour-entanglement effect exists in the Drell-Yan cross section for the ‘double T-odd’ contributions at low transverse momentum bm{Q_st} , rendering the colour structure different from that predicted by the usual factorisation formula . These T-odd contributions can come from the Boer-Mulders or Sivers transverse momentum dependent distribution functions. The different colour structure should be visible already at the lowest possible order that gives a contribution to the double Boer-Mulders (dBM) or double Sivers (dS) effect, that is at the level of two gluon exchanges. To discriminate between the different predictions, we compute the leading-power contribution to the low- bm{Q_st} dBM cross section at the two-gluon exchange order in the context of a spectator model. The computation is performed using a method of regions analysis with Collins subtraction terms implemented. The results conform with the predictions of the factorisation formula. In the cancellation of the colour entanglement, diagrams containing the three-gluon vertex are essential. Furthermore, the Glauber region turns out to play an important role – in fact, it is possible to assign the full contribution to the dBM cross section at the given order to the region in which the two gluons have Glauber scaling. A similar disentanglement of colour is found for the dS effect." @default.
- W2754013412 created "2017-09-25" @default.
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- W2754013412 date "2017-12-19" @default.
- W2754013412 modified "2023-09-27" @default.
- W2754013412 title "Colour unwound - disentangling colours for azimuthal asymmetries in Drell-Yan scattering" @default.
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- W2754013412 doi "https://doi.org/10.21468/scipostphys.3.6.040" @default.
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