Abstract
In this paper, we study the production of isolated-photon plus a jet in pp and PbPb collisions, which can be used as an important probe to the jet transport property in quark gluon plasma created in heavy ion collisions. Normally, there are two types of observables associated with the production of isolated-photon plus a jet, namely, the azimuthal angular correlation and the transverse momentum imbalance. To understand both observables in the full kinematical region, we need to employ the perturbative QCD calculation, which takes into account the hard splitting of partons, together with the Sudakov resummation formalism, which resums soft gluon splittings. Furthermore, by introducing energy-loss into the system, we calculate the enhancement of the momentum imbalance distribution for AA as compared to pp collisions and make predictions for future unfolded experimental data. In addition, in order to extract the jet transport coefficient more precisely in our numerical calculation, we also distinguish quark jets from gluon jets, since they interact with quark gluon plasma with different strengths. This work provides a reliable theoretical tool for the calculation of the gamma-jet correlation, which can lead us to a more precise extraction of the jet transport coefficient in relativistic heavy-ion collisions.
Highlights
Created in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven and later at the Large Hadron Collider (LHC)at CERN, the Quark-Gluon Plasma (QGP) is undoubtedly one of the most interesting discoveries in relativistic heavyion collision experiments
We study the production of isolated-photon plus a jet in pp and P bP b collisions, which can be used as an important probe to the jet transport property in quark gluon plasma created in heavy ion collisions
We find that the pQCD calculation can well describe the experimental data when ∆φ is away from π, while the Sudakov resummation formalism gives a nice agreement with experimental data in the back-to-back region
Summary
Created in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven and later at the Large Hadron Collider (LHC). In terms of QCD calculations, the soft branchings can be approximately formulated into parton showers in Monte Carlo simulations in momentum space or taken into account by the Sudakov resummation formalism in coordinate space, which resums multiple soft gluons emissions. It is reasonable to expect that, after a large number of soft branchings, the quantum interferences of matrix-elements is negligible and the factorisation of soft gluons from the lowest order hard part is safe, but the parton showers on top of the lowest order calculations often become insufficient for a lot of observables at the LHC (e.g., the xJγ distribution when it is away from 1). For the calculation of photon-jet correlations considered in this paper, by computing 2 → 3 matrix elements and employing Sudakov resummation formalism, we can achieve the same NLO accuracy as the modern MC generators. 3 q0 ∼ 2 − 8GeV2/fm for P bP b collisions at the LHC at 5.02TeV
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