Papers by Sergey Panitkin
CERN-LHC. Measurements of cross sections for Z0/GAMMA* production plus jets in proton-proton coll... more CERN-LHC. Measurements of cross sections for Z0/GAMMA* production plus jets in proton-proton collisions at a centre-of-mass energy of 7 TeV. The analysis includes the full 2010 data set, collected at low rate of collisions, with a total integrated luminosity of 36 pb^{-1}. Data are presented for Jet PT>30 GeV and |y|<4.4 with cross sections in both the individual electron and muon decay modes of the Z0/GAMMA* as well as combined after correction to a common lepton fiducial region of |y|<2.5 and PT>20 GeV and for QED radiation effects. Note added (26 JUN 2014): The cross section values reported in Tables 1, 3-13 below should be multiplied by a factor of 1.0187 to take into account the updated value of the integrated luminosity for the ATLAS 2010 data taking period. The uncertainty on the global normalisation ("Lumi") increases slightly from 3.4% to 3.5%. See Eur.Phys.J. C73 (2013) 2518 for more details.
CERN-LHC. Experimental measurements of Elliptic Flow, v2(pT), as a function of pT for eight 10% c... more CERN-LHC. Experimental measurements of Elliptic Flow, v2(pT), as a function of pT for eight 10% centrality intervals (from 0-10% most central to 70-80% most peripheral), for pT from 0.5 to 20 GeV, and for three ranges in pseudorapidity (|eta| < 1, 1 < |eta| < 2 and 2 < |eta| < 2.5) (Tables 1-24). In addition, data points of pseudorapidity dependence of elliptic flow, v2(eta), in five pT intervals and eight 10% centrality intervals are presented (Tables 25-64). The elliptic flow parameter (v2) is measured as the second harmonic of the Fourier analysis of the azimuthal angle distribution relative to the azimuthal angle of the reaction plane. For more details see the paper.
CERN-LHC. Measurement of the properties of four-jet events produced in proton-proton collisions a... more CERN-LHC. Measurement of the properties of four-jet events produced in proton-proton collisions at a centre-of-mass energy of 7 TeV in the search for pair-produced scalar particles, in particular scalar gluons. Distributions as a function of the average invariant masses of di-jet pairs are presented as well of several other variables.
CERN-LHC. Results from a search for supersymmetry in events with four or more leptons including e... more CERN-LHC. Results from a search for supersymmetry in events with four or more leptons including electrons, muons and taus are presented. The analysis uses a data sample corresponding to 20.3 fb^{-1} of proton-proton collisions delivered by the Large Hadron Collider at sqrt(s) = 8 TeV and recorded by the ATLAS detector. Signal regions are designed to target supersymmetric scenarios that can be either enriched in or depleted of events involving the production of a Z boson. No significant deviations are observed in data from Standard Model predictions and results are used to set upper limits on the event yields from processes beyond the Standard Model. Exclusion limits at the 95% confidence level on the masses of relevant supersymmetric particles are obtained. In R-parity-violating simplified models with decays of the lightest supersymmetric particle to electrons and muons, limits of 1350 GeV and 750 GeV are placed on gluino and chargino masses, respectively. In R-parity-conserving sim...
CERN-LHC. Results from a search for supersymmetry in events with four or more leptons including e... more CERN-LHC. Results from a search for supersymmetry in events with four or more leptons including electrons, muons and taus are presented. The analysis uses a data sample corresponding to 20.3 fb^{-1} of proton-proton collisions delivered by the Large Hadron Collider at sqrt(s) = 8 TeV and recorded by the ATLAS detector. Signal regions are designed to target supersymmetric scenarios that can be either enriched in or depleted of events involving the production of a Z boson. No significant deviations are observed in data from Standard Model predictions and results are used to set upper limits on the event yields from processes beyond the Standard Model. Exclusion limits at the 95% confidence level on the masses of relevant supersymmetric particles are obtained. In R-parity-violating simplified models with decays of the lightest supersymmetric particle to electrons and muons, limits of 1350 GeV and 750 GeV are placed on gluino and chargino masses, respectively. In R-parity-conserving sim...
CERN-LHC. Results from a search for supersymmetry in events with four or more leptons including e... more CERN-LHC. Results from a search for supersymmetry in events with four or more leptons including electrons, muons and taus are presented. The analysis uses a data sample corresponding to 20.3 fb^{-1} of proton-proton collisions delivered by the Large Hadron Collider at sqrt(s) = 8 TeV and recorded by the ATLAS detector. Signal regions are designed to target supersymmetric scenarios that can be either enriched in or depleted of events involving the production of a Z boson. No significant deviations are observed in data from Standard Model predictions and results are used to set upper limits on the event yields from processes beyond the Standard Model. Exclusion limits at the 95% confidence level on the masses of relevant supersymmetric particles are obtained. In R-parity-violating simplified models with decays of the lightest supersymmetric particle to electrons and muons, limits of 1350 GeV and 750 GeV are placed on gluino and chargino masses, respectively. In R-parity-conserving sim...
CERN-LHC. Measurement of distributions of events with 6 or more jets in association with missing ... more CERN-LHC. Measurement of distributions of events with 6 or more jets in association with missing transverse momentum produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample has a total integrated luminosity of 1.34 fb-1 and uses data-driven techniques to determine the backgrounds. Distributions of the number of jets and of the variable (Missing ET)/sqrt(HT) are presented, where HT is the scalar sum of the transverse momenta of all the jets in the event. Exclusion limits on M_1/2 versus M_0 in the contect of the MSUGRA/CMSSM are also presented. The tables also give, for illustrative purpose, the expectations from the MSUGRA/CMSSM point with M_0=1220 Gev and M_1/2=180 GeV.
CERN-LHC. Measurement of the properties of charged particle jets produced in proton-proton collis... more CERN-LHC. Measurement of the properties of charged particle jets produced in proton-proton collisions at a centre-of-mass energy of 7 TeV using a minimum-bias trigger. The data were taken during 2010 and have an integrated luminosity of 779 mub^{-1}. Jets are reconstructed using the anti-kT algorithm with radius parameters 0.4 and 0.6 applied to charged particles with PT > 300 MeV. The measured track-based jets are corrected back to truth-level charged particle jets, which are defined to be the jets obtained when the same algoerithm is applied to all primary charged particles with the same PT cut. Measurements of the PT cross sections, multiplicities per jet, fragmentation Z distributions, transverse momentum and charged particle radial densities relative to the jet axes are presented in slices of rapidity and transverse momentum. Note added (27 JUN 2014): The cross section values reported in Tables 1-4 below should be multiplied by a factor of 1.0187 to take into account the upd...
CERN-LHC. Measurement of the properties of charged particle jets produced in proton-proton collis... more CERN-LHC. Measurement of the properties of charged particle jets produced in proton-proton collisions at a centre-of-mass energy of 7 TeV using a minimum-bias trigger. The data were taken during 2010 and have an integrated luminosity of 779 mub^{-1}. Jets are reconstructed using the anti-kT algorithm with radius parameters 0.4 and 0.6 applied to charged particles with PT > 300 MeV. The measured track-based jets are corrected back to truth-level charged particle jets, which are defined to be the jets obtained when the same algoerithm is applied to all primary charged particles with the same PT cut. Measurements of the PT cross sections, multiplicities per jet, fragmentation Z distributions, transverse momentum and charged particle radial densities relative to the jet axes are presented in slices of rapidity and transverse momentum. Note added (27 JUN 2014): The cross section values reported in Tables 1-4 below should be multiplied by a factor of 1.0187 to take into account the upd...
CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final... more CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final states characterized by the presence of two leptons (electrons and muons) and missing transverse momentum are performed using 20.3 fb^-1 of proton-proton collision data at sqrt(s) = 8 TeV recorded in 2012 with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. Limits are set on the masses of the lightest chargino, next-to-lightest neutralino and sleptons for different lightest-neutralino mass hypotheses in simplified models. Results are also interpreted in various scenarios of the phenomenological Minimal Supersymmetric Standard Model. UPDATE (06 AUG 2014): corrections to Tables 65-67 corresponding to Figure 20 of Auxiliary Material.
CERN-LHC. Measurement of the properties of charged particle jets produced in proton-proton collis... more CERN-LHC. Measurement of the properties of charged particle jets produced in proton-proton collisions at a centre-of-mass energy of 7 TeV using a minimum-bias trigger. The data were taken during 2010 and have an integrated luminosity of 779 mub^{-1}. Jets are reconstructed using the anti-kT algorithm with radius parameters 0.4 and 0.6 applied to charged particles with PT > 300 MeV. The measured track-based jets are corrected back to truth-level charged particle jets, which are defined to be the jets obtained when the same algoerithm is applied to all primary charged particles with the same PT cut. Measurements of the PT cross sections, multiplicities per jet, fragmentation Z distributions, transverse momentum and charged particle radial densities relative to the jet axes are presented in slices of rapidity and transverse momentum. Note added (27 JUN 2014): The cross section values reported in Tables 1-4 below should be multiplied by a factor of 1.0187 to take into account the upd...
CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final... more CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final states characterized by the presence of two leptons (electrons and muons) and missing transverse momentum are performed using 20.3 fb^-1 of proton-proton collision data at sqrt(s) = 8 TeV recorded in 2012 with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. Limits are set on the masses of the lightest chargino, next-to-lightest neutralino and sleptons for different lightest-neutralino mass hypotheses in simplified models. Results are also interpreted in various scenarios of the phenomenological Minimal Supersymmetric Standard Model. UPDATE (06 AUG 2014): corrections to Tables 65-67 corresponding to Figure 20 of Auxiliary Material.
CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final... more CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final states characterized by the presence of two leptons (electrons and muons) and missing transverse momentum are performed using 20.3 fb^-1 of proton-proton collision data at sqrt(s) = 8 TeV recorded in 2012 with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. Limits are set on the masses of the lightest chargino, next-to-lightest neutralino and sleptons for different lightest-neutralino mass hypotheses in simplified models. Results are also interpreted in various scenarios of the phenomenological Minimal Supersymmetric Standard Model. UPDATE (06 AUG 2014): corrections to Tables 65-67 corresponding to Figure 20 of Auxiliary Material.
CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final... more CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final states characterized by the presence of two leptons (electrons and muons) and missing transverse momentum are performed using 20.3 fb^-1 of proton-proton collision data at sqrt(s) = 8 TeV recorded in 2012 with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. Limits are set on the masses of the lightest chargino, next-to-lightest neutralino and sleptons for different lightest-neutralino mass hypotheses in simplified models. Results are also interpreted in various scenarios of the phenomenological Minimal Supersymmetric Standard Model. UPDATE (06 AUG 2014): corrections to Tables 65-67 corresponding to Figure 20 of Auxiliary Material.
CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final... more CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final states characterized by the presence of two leptons (electrons and muons) and missing transverse momentum are performed using 20.3 fb^-1 of proton-proton collision data at sqrt(s) = 8 TeV recorded in 2012 with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. Limits are set on the masses of the lightest chargino, next-to-lightest neutralino and sleptons for different lightest-neutralino mass hypotheses in simplified models. Results are also interpreted in various scenarios of the phenomenological Minimal Supersymmetric Standard Model. UPDATE (06 AUG 2014): corrections to Tables 65-67 corresponding to Figure 20 of Auxiliary Material.
CERN-LHC. Experimental measurements of Elliptic Flow, v2(pT), as a function of pT for eight 10% c... more CERN-LHC. Experimental measurements of Elliptic Flow, v2(pT), as a function of pT for eight 10% centrality intervals (from 0-10% most central to 70-80% most peripheral), for pT from 0.5 to 20 GeV, and for three ranges in pseudorapidity (|eta| < 1, 1 < |eta| < 2 and 2 < |eta| < 2.5) (Tables 1-24). In addition, data points of pseudorapidity dependence of elliptic flow, v2(eta), in five pT intervals and eight 10% centrality intervals are presented (Tables 25-64). The elliptic flow parameter (v2) is measured as the second harmonic of the Fourier analysis of the azimuthal angle distribution relative to the azimuthal angle of the reaction plane. For more details see the paper.
CERN-LHC. Measurement of the properties of charged particle jets produced in proton-proton collis... more CERN-LHC. Measurement of the properties of charged particle jets produced in proton-proton collisions at a centre-of-mass energy of 7 TeV using a minimum-bias trigger. The data were taken during 2010 and have an integrated luminosity of 779 mub^{-1}. Jets are reconstructed using the anti-kT algorithm with radius parameters 0.4 and 0.6 applied to charged particles with PT > 300 MeV. The measured track-based jets are corrected back to truth-level charged particle jets, which are defined to be the jets obtained when the same algoerithm is applied to all primary charged particles with the same PT cut. Measurements of the PT cross sections, multiplicities per jet, fragmentation Z distributions, transverse momentum and charged particle radial densities relative to the jet axes are presented in slices of rapidity and transverse momentum. Note added (27 JUN 2014): The cross section values reported in Tables 1-4 below should be multiplied by a factor of 1.0187 to take into account the upd...
CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final... more CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final states characterized by the presence of two leptons (electrons and muons) and missing transverse momentum are performed using 20.3 fb^-1 of proton-proton collision data at sqrt(s) = 8 TeV recorded in 2012 with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. Limits are set on the masses of the lightest chargino, next-to-lightest neutralino and sleptons for different lightest-neutralino mass hypotheses in simplified models. Results are also interpreted in various scenarios of the phenomenological Minimal Supersymmetric Standard Model. UPDATE (06 AUG 2014): corrections to Tables 65-67 corresponding to Figure 20 of Auxiliary Material.
CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final... more CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final states characterized by the presence of two leptons (electrons and muons) and missing transverse momentum are performed using 20.3 fb^-1 of proton-proton collision data at sqrt(s) = 8 TeV recorded in 2012 with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. Limits are set on the masses of the lightest chargino, next-to-lightest neutralino and sleptons for different lightest-neutralino mass hypotheses in simplified models. Results are also interpreted in various scenarios of the phenomenological Minimal Supersymmetric Standard Model. UPDATE (06 AUG 2014): corrections to Tables 65-67 corresponding to Figure 20 of Auxiliary Material.
CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final... more CERN-LHC. Searches for the electroweak production of charginos, neutralinos and sleptons in final states characterized by the presence of two leptons (electrons and muons) and missing transverse momentum are performed using 20.3 fb^-1 of proton-proton collision data at sqrt(s) = 8 TeV recorded in 2012 with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. Limits are set on the masses of the lightest chargino, next-to-lightest neutralino and sleptons for different lightest-neutralino mass hypotheses in simplified models. Results are also interpreted in various scenarios of the phenomenological Minimal Supersymmetric Standard Model. UPDATE (06 AUG 2014): corrections to Tables 65-67 corresponding to Figure 20 of Auxiliary Material.
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Papers by Sergey Panitkin