TY  - JOUR
AU  - Chatrchyan, S.
AU  - Adžić, Petar
AU  - Đorđević, Miloš
AU  - Ekmedžić, Marko
AU  - Krpić, D.
AU  - Milošević, Jovan
AU  - Milenović, Predrag
AU  - Reković, Vladimir
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5290
AB  - A search is presented for physics beyond the standard model (BSM) in final states with a pair of opposite-sign isolated leptons accompanied by jets and missing transverse energy. The search uses LHC data recorded at a center-of-mass energy root s = 7 TeV with the CMS detector, corresponding to an integrated luminosity of approximately 5 fb(-1). Two complementary search strategies are employed. The first probes models with a specific dilepton production mechanism that leads to a characteristic kinematic edge in the dilepton mass distribution. The second strategy probes models of dilepton production with heavy, colored objects that decay to final states including invisible particles, leading to very large hadronic activity and missing transverse energy. No evidence for an event yield in excess of the standard model expectations is found. Upper limits on the BSM contributions to the signal regions are deduced from the results, which are used to exclude a region of the parameter space of the constrained minimal supersymmetric extension of the standard model. Additional information related to detector efficiencies and response is provided to allow testing specific models of BSM physics not considered in this Letter. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
T2  - Physics Letters B
T1  - Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at root s=7 TeV
VL  - 718
IS  - 3
SP  - 815
EP  - 840
DO  - 10.1016/j.physletb.2012.11.036
ER  - 

@article{
author = "Chatrchyan, S. and Adžić, Petar and Đorđević, Miloš and Ekmedžić, Marko and Krpić, D. and Milošević, Jovan and Milenović, Predrag and Reković, Vladimir",
year = "2013",
abstract = "A search is presented for physics beyond the standard model (BSM) in final states with a pair of opposite-sign isolated leptons accompanied by jets and missing transverse energy. The search uses LHC data recorded at a center-of-mass energy root s = 7 TeV with the CMS detector, corresponding to an integrated luminosity of approximately 5 fb(-1). Two complementary search strategies are employed. The first probes models with a specific dilepton production mechanism that leads to a characteristic kinematic edge in the dilepton mass distribution. The second strategy probes models of dilepton production with heavy, colored objects that decay to final states including invisible particles, leading to very large hadronic activity and missing transverse energy. No evidence for an event yield in excess of the standard model expectations is found. Upper limits on the BSM contributions to the signal regions are deduced from the results, which are used to exclude a region of the parameter space of the constrained minimal supersymmetric extension of the standard model. Additional information related to detector efficiencies and response is provided to allow testing specific models of BSM physics not considered in this Letter. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.",
journal = "Physics Letters B",
title = "Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at root s=7 TeV",
volume = "718",
number = "3",
pages = "815-840",
doi = "10.1016/j.physletb.2012.11.036"
}

Chatrchyan, S., Adžić, P., Đorđević, M., Ekmedžić, M., Krpić, D., Milošević, J., Milenović, P.,& Reković, V.. (2013). Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at root s=7 TeV. in Physics Letters B, 718(3), 815-840.
https://doi.org/10.1016/j.physletb.2012.11.036

Chatrchyan S, Adžić P, Đorđević M, Ekmedžić M, Krpić D, Milošević J, Milenović P, Reković V. Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at root s=7 TeV. in Physics Letters B. 2013;718(3):815-840.
doi:10.1016/j.physletb.2012.11.036 .

Chatrchyan, S., Adžić, Petar, Đorđević, Miloš, Ekmedžić, Marko, Krpić, D., Milošević, Jovan, Milenović, Predrag, Reković, Vladimir, "Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at root s=7 TeV" in Physics Letters B, 718, no. 3 (2013):815-840,
https://doi.org/10.1016/j.physletb.2012.11.036 . .

TY  - JOUR
AU  - Chatrchyan, S.
AU  - Adžić, Petar
AU  - Đorđević, Miloš
AU  - Ekmedžić, Marko
AU  - Krpić, D.
AU  - Milošević, Jovan
AU  - Milenović, Predrag
AU  - Reković, Vladimir
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5288
AB  - Results from the first study of isolated-photon + jet correlations in relativistic heavy ion collisions are reported. The analysis uses data from PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair corresponding to an integrated luminosity of 150 mu b(-1) recorded by the CMS experiment at the LHC. For events containing an isolated photon with transverse momentum p(T)(gamma) GT 60 GeV/c and an associated jet with p(T)(Jet) GT 30 GeV/c, the photon + jet P-T imbalance is studied as a function of collision centrality and compared to pp data and PYFHIA calculations at the same collision energy. Using the of the isolated photon as an estimate of the momentum of the associated parton at production, this measurement allows an unbiased characterisation of the in-medium parton energy loss. For more central PbPb collisions, a significant decrease in the ratio p(T)(Jet)/p(T)(gamma) pi. relative to that in the PYFHIA reference is observed. Furthermore, significantly more p(T)(gamma) GT 60 GeV/c photons in PbPb are observed not to have an associated p(T)(Jet) GT 30 GeV/c jet, compared to the reference. However, no significant broadening of the photon + jet azimuthal correlation is observed. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
T2  - Physics Letters B
T1  - Studies of jet quenching using isolated-photon plus jet correlations in PbPb and pp collisions at root s(NN)=2.76 TeV
VL  - 718
IS  - 3
SP  - 773
EP  - 794
DO  - 10.1016/j.physletb.2012.11.003
ER  - 

@article{
author = "Chatrchyan, S. and Adžić, Petar and Đorđević, Miloš and Ekmedžić, Marko and Krpić, D. and Milošević, Jovan and Milenović, Predrag and Reković, Vladimir",
year = "2013",
abstract = "Results from the first study of isolated-photon + jet correlations in relativistic heavy ion collisions are reported. The analysis uses data from PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair corresponding to an integrated luminosity of 150 mu b(-1) recorded by the CMS experiment at the LHC. For events containing an isolated photon with transverse momentum p(T)(gamma) GT 60 GeV/c and an associated jet with p(T)(Jet) GT 30 GeV/c, the photon + jet P-T imbalance is studied as a function of collision centrality and compared to pp data and PYFHIA calculations at the same collision energy. Using the of the isolated photon as an estimate of the momentum of the associated parton at production, this measurement allows an unbiased characterisation of the in-medium parton energy loss. For more central PbPb collisions, a significant decrease in the ratio p(T)(Jet)/p(T)(gamma) pi. relative to that in the PYFHIA reference is observed. Furthermore, significantly more p(T)(gamma) GT 60 GeV/c photons in PbPb are observed not to have an associated p(T)(Jet) GT 30 GeV/c jet, compared to the reference. However, no significant broadening of the photon + jet azimuthal correlation is observed. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.",
journal = "Physics Letters B",
title = "Studies of jet quenching using isolated-photon plus jet correlations in PbPb and pp collisions at root s(NN)=2.76 TeV",
volume = "718",
number = "3",
pages = "773-794",
doi = "10.1016/j.physletb.2012.11.003"
}

Chatrchyan, S., Adžić, P., Đorđević, M., Ekmedžić, M., Krpić, D., Milošević, J., Milenović, P.,& Reković, V.. (2013). Studies of jet quenching using isolated-photon plus jet correlations in PbPb and pp collisions at root s(NN)=2.76 TeV. in Physics Letters B, 718(3), 773-794.
https://doi.org/10.1016/j.physletb.2012.11.003

Chatrchyan S, Adžić P, Đorđević M, Ekmedžić M, Krpić D, Milošević J, Milenović P, Reković V. Studies of jet quenching using isolated-photon plus jet correlations in PbPb and pp collisions at root s(NN)=2.76 TeV. in Physics Letters B. 2013;718(3):773-794.
doi:10.1016/j.physletb.2012.11.003 .

Chatrchyan, S., Adžić, Petar, Đorđević, Miloš, Ekmedžić, Marko, Krpić, D., Milošević, Jovan, Milenović, Predrag, Reković, Vladimir, "Studies of jet quenching using isolated-photon plus jet correlations in PbPb and pp collisions at root s(NN)=2.76 TeV" in Physics Letters B, 718, no. 3 (2013):773-794,
https://doi.org/10.1016/j.physletb.2012.11.003 . .