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BI-TP 2008/07 The Color Dipole Picture and the ratio of R(W 2, Q 2) = σL/σT 12

By Masaaki Kuroda A, Dieter Schildknecht B and Q M Q¯q Mp


The transverse size of q¯q fluctuations of the longitudinal photon is reduced relative to the transverse size of q¯q fluctuations of the transverse photon. This implies R(W 2, Q 2) = 0.375 or, equivalently, FL/F2 = 0.27, while R(W 2, Q 2) = 0.5, if this effect is not taken into account. Forthcoming experimental data from HERA will allow to test this prediction.

Topics: L0 = ≫ 1 (2
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