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25 April 2024

» arxiv » 0911.5493

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Effects of azimuth-symmetric acceptance cutoffs on the measured asymmetry in unpolarized Drell-Yan fixed target experiments
A. Bianconi ; D. Alberto ; M.P. Bussa ; M. de Stefanis ; L. Ferrero ; M. Greco ; M. Maggiora ; G. Serbanut ;
Date:	29 Nov 2009
Abstract:	Fixed-target Drell-Yan experiments often feature an acceptance depending, among other parameters, on the azimuthal angle of the lepton track in the laboratory frame. Typically leptons are detected in a defined angular range, with a dead zone in the forward region. If the cutoffs imposed by the azimuthal acceptance are azimuth-independent, at first sight they do not appear dangerous for a measurement of azimuthal asymmetries like the one associated with the Boer-Mulders function and with the violation of the Lam-Tung rule. On the contrary, simulations show that up to 10 percent asymmetries are systematically produced by these cutoffs. These false asymmetries follow the same behavior of the measured ones, and make the asymmetry measurement in Drell-Yan experiments model-dependent.
Source:	arXiv, 0911.5493
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