Method for separating jets and the underlying event in heavy ion collisions at the BNL Relativistic Heavy Ion Collider

Hanks, J.; Sickles, A. M.; Cole, B.; Franz, A.; McCumber, M.; Morrison, D. P.; Nagle, J. L.; Pinkenburg, C.; Sahlmueller, B.; Steinberg, P.; Steinkirch, Marina von; Stone, M. R.

doi:10.1103/physrevc.86.024908

Cited by 13 publications

(6 citation statements)

References 32 publications

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“…It is apparent that accurate unfolding of background fluctuations from the inclusive spectrum requires suppression of the combinatorial background, via imposition of a fragmentation bias (see also [11]). However, this approach also biases the resulting true jet population, which may be significant for quenching measurements.…”

Section: Inclusive Jet Spectrum Measurementmentioning

confidence: 99%

Data-driven analysis methods for the measurement of reconstructed jets in heavy ion collisions at RHIC and LHC

et al. 2013

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We present data-driven methods for the full reconstruction of jets in heavy ion collisions, for inclusive and coincidence jet measurements at both RHIC and LHC. The complex structure of heavy ion events generates a large background of combinatorial jets, and smears the measured energy of the true hard jet signal. Techniques to correct for these background effects can induce biases in the reported jet distributions, which must be well controlled for accurate measurement of jet quenching. Using model studies, we evaluate the proposed methods for measuring jet distributions accurately while minimizing the fragmentation bias of the measured population.

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Section: Inclusive Jet Spectrum Measurementmentioning

confidence: 99%

Data-driven analysis methods for the measurement of reconstructed jets in heavy ion collisions at RHIC and LHC

et al. 2013

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“…One of the most important steps in heavy-ion jet reconstruction is the underlying event (UE) subtraction. An iterative UE subtraction algorithm has been used based on the PHENIX and AT-LAS method [7]. First, jets are reconstructed using raw calorimeter towers, and the seed jets…”

Section: Simulation Of Jet Performancementioning

confidence: 99%

Next generation jet measurements with sPHENIX

Lee¹

2019

Proceedings of International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardProbes20

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The proposed sPHENIX detector at the Relativistic Heavy Ion Collider (RHIC), designed to take advantage of technological advances from the Large Hadron Collider (LHC), will allow measurements of jets and jet correlations with a kinematic reach that will overlap with measurements made at the LHC. This is made possible by taking advantage of the increased luminosity due to accelerator upgrades and the ability of sPHENIX to sample the entire luminosity. Particle jets, formed when a hard scattered parton fragments and then hadronizes into a spray of particles, are an excellent as a probe of the Quark Gluon Plasma (QGP) formed in heavy-ion collisions. As these partons traverse the QGP formed in heavy ion collisions, they lose energy to the medium, in a process called jet quenching. The physics of this process can be explored by comparing jetbased observables in heavy-ion collisions to those in proton-proton collisions. This is necessary in order to answer the fundamental questions of how and why partons lose energy in the QGP, which will require that we characterize both the medium induced modification of the jet fragmentation pattern, and the correlation of the lost energy with the jet axis. Observables which use the correlation between a high energy photon and a jet are especially useful as the photon kinematics are more closely correlated with the parton kinematics, as well as preferentially selecting quark jets over gluon jets. In addition to inclusive or semi-inclusive jet observables, advances in both theory and measurement at the LHC have provided a suite of new observables which are related to the fragmentation pattern of the jet and how it is modified in the QGP medium. These observables require the precise tracking and calorimetry that the sPHENIX design has. We will show the performance of jet and gamma-jet observables within the sPHENIX detector, including the jet energy scale and resolution in both proton-proton and heavy-ion collisions. These results are simulated with the improved framework developed for understanding the performance of the new detector for measuring jets and photons in a heavy ion environment.

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“…Numerous studies have been done to establish the feasibility of reconstructing jets at √ s N N = 200 GeV in sPHENIX. A large HIJING study was done in order to evaluate the separation of true jets from fake jets (background fluctuations) [9] in an ideal calorimeter. Results for anti-k T R = 0.2 jets are shown in Figure 4 (left).…”

Section: Au+aumentioning

confidence: 99%

“…This is quantified by the jet energy scale, the average shift of the jet energy between reconstructed and true jets and the jet energy resolution which shows the relative width of the difference between the true and reconstructed jet energies. Results from [9]. (right) Asymmetry, A J , for PYTHIA [11] (blue) and PYQUEN [12] (red) for dijets embedded in central HIJING events.…”

Section: Sphenix Upgradesmentioning

confidence: 99%

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The Physics of sPHENIX

Sickles

2012

Preprint

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Jet related observables have been some of the most powerful and exciting probes for understanding the matter produced in ultra-relativistic heavy ion collisions. Full jet reconstruction was begun at RHIC, and the LHC experiments have shown the power and kinematic reach of these observables. Here we discuss the sPHENIX detector and physics program which aims to bring full calorimetric based jet reconstruction to RHIC in order to explore the temperature dependence of the strongly interacting Quark Gluon Plasma.

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Method for separating jets and the underlying event in heavy ion collisions at the BNL Relativistic Heavy Ion Collider

Cited by 13 publications

References 32 publications

Data-driven analysis methods for the measurement of reconstructed jets in heavy ion collisions at RHIC and LHC

Data-driven analysis methods for the measurement of reconstructed jets in heavy ion collisions at RHIC and LHC

Next generation jet measurements with sPHENIX

The Physics of sPHENIX

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