Abstract: The strong Coulomb field created in ultrarelativistic heavy ion collisions is expected to produce a rapidity-dependent difference ($\Delta v_2$) in the second Fourier coefficient of the azimuthal distribution (elliptic flow, $v_2$) between $D^0$ ($\overline{u}c$) and $\overline{D}^0$ ($u\overline{c}$) mesons. Motivated by the search for evidence of this field, the CMS detector at the LHC is used to perform the first measurement of $\Delta v_2$. The rapidity-averaged value is found to be $<\Delta v_2>=0.001\pm0.001(stat)\pm0.003(syst)$ in ...
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