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Azimuthal asymmetry in unpolarized $pi N$ Drell-Yan process | Zhun Lu
; Bo-Qiang Ma
; | Date: |
21 Apr 2005 | Journal: | Phys.Lett. B615 (2005) 200-206 | Subject: | hep-ph hep-ex nucl-ex nucl-th | Abstract: | Taking into account the effect of final state interaction, we calculate the non-zero (naïve) $T$-odd transverse momentum dependent distribution $h_1^{perp}(x,kp^2)$ of the pion in a quark-spectator-antiquark model with effective pion-quark-antiquark coupling as a dipole form factor. Using the model result we estimate the $cos 2phi$ asymmetries in the unpolarized $pi^- N$ Drell-Yan process which can be expressed as $h_1^{perp} imesar{h}_1^{perp}$. We find that the resulting $h_{1pi}^p(x,kp^2)$ has the advantage to reproduce the asymmetry that agrees with the experimental data measured by NA10 Collaboration. We estimate the $cos2phi$ asymmetries averaged over the kinematics of NA10 experiments for 140, 194 and 286 GeV $pi^-$ beam and compare them with relevant experimental data. | Source: | arXiv, hep-ph/0504184 | Services: | Forum | Review | PDF | Favorites |
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