An improved weighting algorithm to achieve software compensation in a fine grained LAr calorimeter

İşsever, Ç.; Borras, K.; Wegener, D.

doi:10.1016/j.nima.2005.02.010

Cited by 27 publications

(22 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The method subtracts a contribution from the jet energy equal to the product of the jet area and the average energy density of the event [85]. The local cluster weighting (LCW) jet calibration method [82,86] is used to classify topological cell clusters within the jets as being of either electromagnetic or hadronic origin, and based on this classification applies specific energy corrections derived from a combination of MC simulation and data. Further corrections, referred to as 'jet energy scale' or 'JES' corrections below, are derived from MC simulation and data and used to calibrate the energies of jets to the scale of their constituent particles [82,87].…”

Section: Event Reconstructionmentioning

confidence: 99%

Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using s = 8 $$ \sqrt{s}=8 $$ TeV proton-proton collision data

Aad

Abbott

Abdallah

et al. 2014

J. High Energ. Phys.

Self Cite

270

377

View full text Add to dashboard Cite

A search for squarks and gluinos in final states containing high-p T jets, missing transverse momentum and no electrons or muons is presented. The data were recorded in 2012 by the ATLAS experiment in √ s = 8 TeV proton-proton collisions at the Large Hadron Collider, with a total integrated luminosity of 20.3 fb −1 . Results are interpreted in a variety of simplified and specific supersymmetry-breaking models assuming that R-parity is conserved and that the lightest neutralino is the lightest supersymmetric particle. An exclusion limit at the 95% confidence level on the mass of the gluino is set at 1330 GeV for a simplified model incorporating only a gluino and the lightest neutralino. For a simplified model involving the strong production of first-and second-generation squarks, squark masses below 850 GeV (440 GeV) are excluded for a massless lightest neutralino, assuming mass degenerate (single light-flavour) squarks. In mSUGRA/CMSSM models with tan β = 30, A 0 = −2m 0 and µ > 0, squarks and gluinos of equal mass are excluded for masses below 1700 GeV. Additional limits are set for non-universal Higgs mass models with gaugino mediation and for simplified models involving the pair production of gluinos, each decaying to a top squark and a top quark, with the top squark decaying to a charm quark and a neutralino. These limits extend the region of supersymmetric parameter space excluded by previous searches with the ATLAS detector.

show abstract

Section: Event Reconstructionmentioning

confidence: 99%

Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using s = 8 $$ \sqrt{s}=8 $$ TeV proton-proton collision data

Aad

Abbott

Abdallah

et al. 2014

J. High Energ. Phys.

Self Cite

270

377

View full text Add to dashboard Cite

show abstract

“…These seed jets are calibrated with the local calibration (LC) scheme [41,42]. The τ candidate must have E τ T > 20 GeV, jη τ j < 2.3, and only one track with p T > 4 GeV associated with the τ candidate (77% of hadronic τ decays have only one track).…”

Section: Event Selectionmentioning

confidence: 99%

Measurements of the top quark branching ratios into channels with leptons and quarks with the ATLAS detector

Aad¹,

Abbott²,

Abdallah³

et al. 2015

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

Measurements of the branching ratios of top quark decays into leptons and jets using events with tt (top antitop) pairs are reported. Events were recorded with the ATLAS detector at the LHC in pp collisions at a center-of-mass energy of 7 TeV. The collected data sample corresponds to an integrated luminosity of 4.6 fb −1 . The measured top quark branching ratios agree with the Standard Model predictions within the measurement uncertainties of a few percent.

show abstract

“…Jet momenta are constructed by performing a four-vector sum over these clusters of calorimeter cells, treating each as an (E, p) four-vector with zero mass. The local cluster weighting (LCW) calibration method [29] is used to classify clusters as being of either electromagnetic or hadronic origin and, based on this classification, applies specific energy corrections derived from a combination of Monte Carlo simulation and data [28]. A further calibration is applied to the corrected jet energies to relate the response of the calorimeter to the true jet energy [28].…”

mentioning

confidence: 99%

Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at $ \sqrt{s}=8 $ TeV proton-proton collisions using the ATLAS experiment

Aad

Abajyan

Abbott

et al. 2013

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

A search is presented for new particles decaying to large numbers (7 or more) of jets, with missing transverse momentum and no isolated electrons or muons. This analysis uses 20.3 fb −1 of pp collision data at √ s = 8 TeV collected by the ATLAS experiment at the Large Hadron Collider. The sensitivity of the search is enhanced by considering the number of b-tagged jets and the scalar sum of masses of large-radius jets in an event. No evidence is found for physics beyond the Standard Model. The results are interpreted in the context of various simplified supersymmetry-inspired models where gluinos are pair produced, as well as an mSUGRA/CMSSM model. The ATLAS collaboration 34 IntroductionMany extensions of the Standard Model of particle physics predict the presence of TeVscale strongly interacting particles that decay to weakly interacting descendants. In the context of R-parity-conserving supersymmetry (SUSY) [1][2][3][4][5], the strongly interacting parent particles are the partners of the quarks (squarks,q) and gluons (gluinos,g), and are produced in pairs. The lightest supersymmetric particle (LSP) is stable, providing a candidate that can contribute to the relic dark-matter density in the universe [6,7]. If they are kinematically accessible, the squarks and gluinos could be produced in the proton-proton interactions at the Large Hadron Collider (LHC) [8].-1 - JHEP10(2013)130Such particles are expected to decay in cascades, the nature of which depends on the mass hierarchy within the model. The events would be characterised by significant missing transverse momentum from the unobserved weakly interacting descendants, and by a large number of jets from emissions of quarks and/or gluons. Individual cascade decays may include gluino decays to a top squark (stop,t) and an anti-top quark, g →t +t (1.1a)followed by the top-squark decay to a top quark and a neutralino LSP,χ 0 1 , t → t +χ 0 1.(1.1b)Alternatively, if the top squark is heavier than the gluino, the three-body decay, g → t +t +χ 0 1 (1.2) may result. Other possibilities include decays involving intermediate charginos, neutralinos, and/or squarks including bottom squarks. A pair of cascade decays produces a large number of Standard Model particles, together with a pair of LSPs, one from the end of each cascade. The LSPs are assumed to be stable and only weakly interacting, and so escape undetected, resulting in missing transverse momentum. In this paper we consider final states with large numbers of jets together with significant missing transverse momentum in the absence of isolated electrons or muons, using the pp collision data recorded by the ATLAS experiment [9] during 2012 at a centre-of-mass energy of √ s = 8 TeV. The corresponding integrated luminosity is 20.3 fb −1 . Searches for new phenomena in final states with large jet multiplicities -requiring from at least six to at least nine jets -and missing transverse momentum have previously been reported by the ATLAS Collaboration using LHC pp collision data corresponding to 1.34 fb −1 [10]...

show abstract

An improved weighting algorithm to achieve software compensation in a fine grained LAr calorimeter

Cited by 27 publications

References 28 publications

Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using s = 8 $$ \sqrt{s}=8 $$ TeV proton-proton collision data

Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using s = 8 $$ \sqrt{s}=8 $$ TeV proton-proton collision data

Measurements of the top quark branching ratios into channels with leptons and quarks with the ATLAS detector

Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at $ \sqrt{s}=8 $ TeV proton-proton collisions using the ATLAS experiment

Contact Info

Product

Resources

About