Jet energy measurement with the ATLAS detector in proton-proton collisions at $\sqrt{\mathrm{s}}=7\ \mathrm{TeV}$
Abstract
The jet energy scale and its systematic uncertainty are determined for jets measured with the ATLAS detector at the LHC in proton-proton collision data at a centre-of-mass energy of s = 7 TeV corresponding to an integrated luminosity of 38 pb -1 . Jets are reconstructed with the anti-k t algorithm with distance parameters R = 0.4 or R = 0.6. Jet energy and angle corrections are determined from Monte Carlo simulations to calibrate jets with transverse momenta p T 20 GeV and pseudorapidities || < 4.5. The jet energy systematic uncertainty is estimated using the single isolated hadron response measured in situ and in test-beams, exploiting the transverse momentum balance between central and forward jets in events with dijet topologies and studying systematic variations in Monte Carlo simulations. The jet energy uncertainty is less than 2.5 % in the central calorimeter region (|| < 0.8) for jets with 60 p T < 800 GeV, and is maximally 14 % for p T < 30 GeV in the most forward region 3.2 || < 4.5. The jet energy is validated for jet transverse momenta up to 1 TeV to the level of a few percent using several in situ techniques by comparing a well-known reference such as the recoiling photon p T , the sum of the transverse momenta of tracks associated to the jet, or a system of low-p T jets recoiling against a high-p T jet. More sophisticated jet calibration schemes are presented based on calorimeter cell energy density weighting or hadronic properties of jets, aiming for an improved jet energy resolution and a reduced flavour dependence of the jet response. The systematic uncertainty of the jet energy determined from a combination of in situ techniques is consistent with the one derived from single hadron response measurements over a wide kinematic range. The nominal corrections and uncertainties are derived for isolated jets in an inclusive sample of high-p T jets. Special cases such as event topologies with close-by jets, or selections of samples with an enhanced content of jets originating e-mail: atlas.publications
Funding
- National Science Foundation
- U.S. Department of Energy
- Alexander von Humboldt-Stiftung
- Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
- Türkiye Atom Enerjisi Kurumu
- TRIUMF
- CERN
- Leverhulme Trust
- Royal Society
- European Commission
- Department of Science and Technology, Ministry of Science and Technology, India
- Deutsche Forschungsgemeinschaft
- Ministry of Education, Culture, Sports, Science and Technology
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Danmarks Grundforskningsfond
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- National Natural Science Foundation of China
- National Science Council
- Bundesministerium für Bildung und Forschung
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
- Ministry of Education and Science of the Russian Federation
- General Secretariat for Research and Technology
- Lundbeckfonden
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Joint Institute for Nuclear Research
- Israel Science Foundation
- Knut och Alice Wallenbergs Stiftelse
- Max-Planck-Gesellschaft
- Javna Agencija za Raziskovalno Dejavnost RS
- Vetenskapsrådet
- Ministerstwo Edukacji i Nauki
- Ministerstvo Průmyslu a Obchodu
- Centre National de la Recherche Scientifique
- Financiadora de Estudos e Projetos
- Ministerio de Ciencia e Innovación
- Norges Forskningsråd
- Centre National pour la Recherche Scientifique et Technique
- Bundesministerium für Wissenschaft und Forschung
- State Atomic Energy Corporation ROSATOM
- Services Fédéraux des Affaires Scientifiques, Techniques et Culturelles
- Ministrstvo za visoko šolstvo, znanost in tehnologijo
- H. Lundbeck A/S
- Natural Sciences and Engineering Research Council of Canada
- Science and Technology Facilities Council
- Japan Society for the Promotion of Science
- Fundação para a Ciência e a Tecnologia
- Comisión Nacional de Investigación Científica y Tecnológica
- Agencia Nacional de Promoción Científica y Tecnológica
- Institut National de Physique Nucléaire et de Physique des Particules
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