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28 March 2024
 
  » arxiv » hep-ph/0504184

 Article overview


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
AbstractTaking 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
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