Quenching of jets tagged with W bosons in high-energy nuclear collisions

摘要

We carry out detailed calculations of jet production associated with W gauge bosons in Pb + Pb collisions at the Large Hadron Collider (LHC). In our calculations, the production of W + jet in p + p collisions as a reference is obtained by SHERPA, which performs next-to-leading-order matrix-element calculations matched to the resummation of parton shower simulations, while jet propagation and medium response in the quark-gluon plasma are simulated with the linear Boltzmann transport (LBT) model. We provide numerical predictions on seven observables of W + jet production with jet quenching in Pb + Pb collisions: the medium modification factor for the tagged jet cross sections I-AA, the distribution in invariant mass between the two leading jets in N-jets >= 2 events m(jj), the missing p(T) or the vector sum of the lepton and jet transverse momentum vertical bar p(T)(->)(Miss)vertical bar, the summed scalar p(T) of all the jets in an event S-T, transverse momentum imbalance x(jW), average number of jets per W boson R-jW, and azimuthal angle between the W boson and jets Delta phi(jW). The distinct nuclear modifications of these seven observables in Pb + Pb relative to that in p + p collisions are presented with detailed discussions.

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