Jet energy measurement with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV

ATLAS, Collaboration; Ancu, Lucian; Battaglia, Andreas; Beck, Hanspeter; Borer, Claudia; Ereditato, Antonio; Fonseca, Maria; Gallo, Valentina; Haug, Sigve; Kabana, Sonja; Kruker, Tobias; Pretzl, Klaus-Peter; Weber, Michael (2013). Jet energy measurement with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV. European physical journal. C - particles and fields, 73(3), p. 2304. EDP Sciences 10.1140/epjc/s10052-013-2304-2

This is the latest version of this item.

[img]
Preview
Text
2304-2.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (8MB) | Preview

The jet energy scale (JES) 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 sqrt(s) = 7 TeV corresponding to an integrated luminosity of 38 inverse pb. Jets are reconstructed with the anti-kt 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 pt > 20 GeV and pseudorapidities eta<4.5. The JES systematic uncertainty is estimated using the single isolated hadron response measured in situ and in test-beams. The JES uncertainty is less than 2.5% in the central calorimeter region (eta<0.8) for jets with 60 < pt < 800 GeV, and is maximally 14% for pt < 30 GeV in the most forward region 3.2<eta<4.5. The uncertainty for additional energy from multiple proton-proton collisions in the same bunch crossing is less than 1.5% per additional collision for jets with pt > 50 GeV after a dedicated correction for this effect. The JES 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 pt, the sum of the transverse momenta of tracks associated to the jet, or a system of low-pt jets recoiling against a high-pt jet. More sophisticated jet calibration schemes are presented based on calorimeter cell energy density weighting or hadronic properties of jets, providing an improved jet energy resolution and a reduced flavour dependence of the jet response. The JES systematic uncertainty determined from a combination of in situ techniques are 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-pt jets.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)

UniBE Contributor:

Ancu, Lucian; Battaglia, Andreas; Beck, Hans Peter; Borer, Claudia; Ereditato, Antonio; Fonseca, Maria; Gallo, Valentina; Haug, Sigve; Kruker, Tobias; Pretzl, Klaus-Peter and Weber, Michael

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

Elena Kirillova

Date Deposited:

12 May 2014 16:09

Last Modified:

26 Apr 2017 02:28

Publisher DOI:

10.1140/epjc/s10052-013-2304-2

Web of Science ID:

000318290600001

ArXiv ID:

1112.6426

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.52508

URI:

https://boris.unibe.ch/id/eprint/52508 (FactScience: 216282)

Available Versions of this Item

Actions (login required)

Edit item Edit item
Provide Feedback