Physics:Quantum data analysis/Jets: Difference between revisions

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{{Short description|Jets in particle-physics data analysis}}
{{Short description|Jets in particle-collision data analysis}}


{{Quantum data backlink|Collision Kinematics and Complex Observables}}
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'''Jets''' are collimated sprays of particles produced when high-energy quarks or gluons fragment into hadrons. In data analysis, jets are reconstructed objects rather than elementary particles: they depend on clustering algorithms, calibration, detector response, pileup mitigation, and analysis definitions. Jets are essential for QCD studies, top physics, Higgs measurements, and many searches for new physics.<ref name="pdg2024">{{cite journal |collaboration=Particle Data Group |title=Review of Particle Physics |journal=Physical Review D |volume=110 |issue=3 |pages=030001 |year=2024 |doi=10.1103/PhysRevD.110.030001}}</ref>
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[[File:Quantum_data_analysis_jet_reconstruction_yellow.png|thumb|280px|Jet reconstruction clusters many final-state particles into collimated sprays from quarks and gluons.]]
[[File:Quantum_data_analysis_jet_reconstruction_yellow.png|thumb|280px|Jet reconstruction represented as clustered sprays of particles.]]
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== Jet reconstruction ==
Jet algorithms cluster particles or detector objects using distance measures in momentum and angle. The algorithm choice and radius parameter define the measured object and must match the theory or simulation comparison.<ref name="pdg2024">{{cite journal |collaboration=Particle Data Group |title=Review of Particle Physics |journal=Physical Review D |volume=110 |issue=3 |pages=030001 |year=2024 |doi=10.1103/PhysRevD.110.030001}}</ref>
== Calibration and uncertainties ==
Jet energy scale, resolution, flavor response, pileup, and tagging efficiency are major sources of systematic uncertainty. Control samples and simulation are used to calibrate jets and estimate their uncertainties.<ref name="atlasdet">{{cite journal |collaboration=ATLAS Collaboration |title=The ATLAS Experiment at the CERN Large Hadron Collider |journal=Journal of Instrumentation |volume=3 |pages=S08003 |year=2008 |doi=10.1088/1748-0221/3/08/S08003}}</ref><ref name="cmsdet">{{cite journal |collaboration=CMS Collaboration |title=The CMS experiment at the CERN LHC |journal=Journal of Instrumentation |volume=3 |pages=S08004 |year=2008 |doi=10.1088/1748-0221/3/08/S08004}}</ref>
== Physics role ==
Jets reveal quark and gluon dynamics, hadronic decays of heavy particles, missing-energy backgrounds, and event topology. Substructure methods can identify boosted particle decays inside a single large-radius jet.<ref name="pythia">{{cite journal |last1=Sjostrand |first1=Torbjorn |last2=Mrenna |first2=Stephen |last3=Skands |first3=Peter |title=A brief introduction to PYTHIA 8.1 |journal=Computer Physics Communications |volume=178 |issue=11 |pages=852-867 |year=2008 |doi=10.1016/j.cpc.2008.01.036}}</ref>


=See also=
=See also=

Revision as of 20:57, 19 May 2026


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Jets are collimated sprays of particles produced when high-energy quarks or gluons fragment into hadrons. In data analysis, jets are reconstructed objects rather than elementary particles: they depend on clustering algorithms, calibration, detector response, pileup mitigation, and analysis definitions. Jets are essential for QCD studies, top physics, Higgs measurements, and many searches for new physics.[1]

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Jet reconstruction represented as clustered sprays of particles.

Jet reconstruction

Jet algorithms cluster particles or detector objects using distance measures in momentum and angle. The algorithm choice and radius parameter define the measured object and must match the theory or simulation comparison.[1]

Calibration and uncertainties

Jet energy scale, resolution, flavor response, pileup, and tagging efficiency are major sources of systematic uncertainty. Control samples and simulation are used to calibrate jets and estimate their uncertainties.[2][3]

Physics role

Jets reveal quark and gluon dynamics, hadronic decays of heavy particles, missing-energy backgrounds, and event topology. Substructure methods can identify boosted particle decays inside a single large-radius jet.[4]

See also

Table of contents (60 articles)

Index

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References

  1. ↑ 1.0 1.1 "Review of Particle Physics". Physical Review D 110 (3): 030001. 2024. doi:10.1103/PhysRevD.110.030001. 
  2. ↑ "The ATLAS Experiment at the CERN Large Hadron Collider". Journal of Instrumentation 3: S08003. 2008. doi:10.1088/1748-0221/3/08/S08003. 
  3. ↑ "The CMS experiment at the CERN LHC". Journal of Instrumentation 3: S08004. 2008. doi:10.1088/1748-0221/3/08/S08004. 
  4. ↑ Sjostrand, Torbjorn; Mrenna, Stephen; Skands, Peter (2008). "A brief introduction to PYTHIA 8.1". Computer Physics Communications 178 (11): 852-867. doi:10.1016/j.cpc.2008.01.036. 
Author: Sergei V. Chekanov
Author: Claude Pruneau
Author: Harold Foppele

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