Dilepton tagged jets

We present simulation studies of a possible jet measurement at LHC using the leptonic decay of a high transverse momentum virtual photon/Z⁰ in association with a quark/gluon jet. The interested production channels are q+q̄→Z⁰/γ^*+g and g+q→Z⁰/γ*+q with the subsequent Z⁰/γ*→μ^-+μ⁺ decay. The total energy of the jet is highly correlated to that of the dilepton coming from the Z⁰/γ^* decay. The jet can be considered in this case as tagged (i.e. a dilepton-tag) with a known energy. Based on momentum balance between the dilepton (whose energy is not modified by the medium) and the jet (which does suffer energy loss in the medium), the angular correlation analysis that we plan to perform can shed light on the properties of the medium traversed (e.g. density) and parton fragmentation functions.