Now showing items 1-20 of 93

    • An analytical approach for calculating energy spectra of relativistic runaway electron avalanches in air 

      Cramer, Eric S.; Dwyer, Joseph R.; Arabshahi, Shahab; Liu, Ningyu; Rassoul, Hamid K.; Vodopiyanov, Igor (2014-09-15)
      Simplified equations describing the transport and energy spectrum of runaway electrons are derived from the basic kinematics of the continuity equations. These equations are useful in modeling the energy distribution of ...
    • Charged particle multiplicities in pp interactions at √s = 0.9, 2.36, and 7 TeV 

      Khachatryan, S.; Sirunyan, A.M.; Tumasyan, A.R.; Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, Himali; Ralich, Robert M.; Vodopiyanov, Igor (2011-01-19)
      Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of √s = 0.9, 2.36, and 7 TeV, in five pseudorapidity ...
    • Charged particle transverse momentum spectra in pp collisions at √s = 0:9 and 7 TeV 

      Chatrchyan, S.; Khachatryan, Vardan; Sirunyan, A.M.; Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, Himali; Ralich, Robert M.; Vodopiyanov, Igor (2011-08-19)
      The charged particle transverse momentum (pT) spectra are presented for pp collisions at √s = 0.9 and 7 TeV. The data samples were collected with the CMS detector at the LHC and correspond to integrated luminosities of ...
    • The effect of direct electron-positron pair production on relativistic feedback rates 

      Vodopiyanov, Igor; Dwyer, Jason R.; Cramer, Eric S.; Lucia, R. J.; Rassoul, Hamid K. (2015-01-30)
      Runaway electron avalanches developing in thunderclouds in high electric field become self-sustaining due to relativistic feedback via the production of backward propagating positrons and backscattered X-rays. To date, ...
    • Evidence for associated production of a single top quark and W Boson in pp collisions at √s=7 TeV 

      Chatrchyan, S.A.; Khachatryan, Vladimir A.; Sirunyan, A.M.; Tumasyan, A.R.; Adam, W.; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor (2013-01-11)
      Evidence is presented for the associated production of a single top quark and W boson in pp collisions at √s=7 TeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 4.9 fb -1. ...
    • Exclusive γγ → +μμ - production in proton-proton collisions at √s = 7 TeV 

      Chatrchyan, S.; Khachatryan, Vardan; Sirunyan, A.M.; Tumasyan, A.R.; Adam, Wolfgang; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor (2012-01-11)
      A measurement of the exclusive two-photon production of muon pairs in proton-proton collisions at √s = 7 TeV, pp → pμ+μ−p, is reported using data corresponding to an integrated luminosity of 40 pb−1. For muon pairs with ...
    • First measurement of Bose-Einstein correlations in proton-proton collisions at √s=0.9 and 2.36 TeV at the LHC 

      Khachatryan, Vardan; Sirunyan, A. M.; Tumasyan, A. R.; Baarmand, Marc M.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, H.; Mermerkaya, H.; Ralich, Robert M.; Vodopiyanov, Igor (2010-07-13)
      Bose-Einstein correlations have been measured using samples of proton-proton collisions at 0.9 and 2.36 TeV center-of-mass energies, recorded by the CMS experiment at the CERN Large Hadron Collider. The signal is observed ...
    • Generalized event shape and energy flow studies in e+e- annihilation at √s = 91.2-208.0 gev 

      Archard, Pablo; Adriáni, Oscar S.; Aguilar-Benítez, M.; Baksay, Gyöngyi; Baksay, László A.; Dehmelt, Klaus; Hohlmann, Marcus; Rembeczki, S.; Szillási, Zolton; Vodopiyanov, Igor (2011-10-31)
      We present results from a study of hadronic event structure in high energy e+e− interactions using the L3 detector at LEP. A new class of event shape distributions are measured at and above the Z boson pole for light quark ...
    • Inclusive b-hadron production cross section with muons in pp collisions at √s = 7 TeV 

      Khachatryan, Vardan; Sirunyan, A.M.; Tumasyan, A.R.; Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, Himali; Ralich, Robert M.; Vodopiyanov, Igor (2011-03-18)
      A measurement of the b-hadron production cross section in proton-proton collisions at √s = 7TeV is presented. The dataset, corresponding to 85 nb−1, was recorded with the CMS experiment at the LHC using a low-threshold ...
    • Inclusive b-jet production in pp collisions at √s = 7 TeV 

      Chatrchyan, S.; Khachatryan, Vardan; Sirunyan, A.M.; Tumasyan, A.R.; Adam, Wolfgang; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor (2012-04-17)
      The inclusive b-jet production cross section in pp collisions at a center-of mass energy of 7 TeV is measured using data collected by the CMS experiment at the LHC. The cross section is presented as a function of the jet ...
    • Inclusive search for supersymmetry using razor variables in pp collisions at √s=7 TeV 

      Chatrchyan, S.A.; Khachatryan, Vladimir A.; Sirunyan, A.M.; Tumasyan, A.R.; Adam, W.; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor (2013-08-23)
      An inclusive search is presented for new heavy particle pairs produced in √s=7 TeV proton-proton collisions at the LHC using 4.7±0.1 fb -1 of integrated luminosity. The selected events are analyzed in the 2D razor space ...
    • Interpretation of searches for supersymmetry with simplified models 

      Chatrchyan, S.A.; Khachatryan, Vladimir A.; Sirunyan, A.M.; Tumasyan, A.R.; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor; Yumiceva, Francisco (2013-09-23)
      The results of searches for supersymmetry by the CMS experiment are interpreted in the framework of simplified models. The results are based on data corresponding to an integrated luminosity of 4.73 to 4.98 fb-1. The data ...
    • J/ψ and ψ (2S) production in pp collisions at √s = 7 TeV 

      Chatrchyan, S.; Khachatryan, Vardan; Sirunyan, A.M.; Tumasyan, A.R.; Adam, Wolfgang; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor (2012-02-07)
      A measurement of the J/ψ and ψ(2S) production cross sections in pp collisions at √s = 7TeV with the CMS experiment at the LHC is presented. The data sample corresponds to an integrated luminosity of 37 pb−1. Using a fit ...
    • Jet production rates in association with W and Z bosons in pp collisions at √s = 7 TeV 

      Chatrchyan, S.; Khachatryan, Vardan; Sirunyan, A.M.; Tumasyan, A.R.; Adam, Wolfgang; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor (2012-01-03)
      Measurements of jet production rates in association with W and Z bosons for jet transverse momenta above 30 GeV are reported, using a sample of proton-proton collision events recorded by CMS at √s = 7TeV , corresponding ...
    • Long-range and short-range dihadron angular correlations in central PbPb collisions at psNN = 2:76 TeV 

      Chatrchyan, S.; Khachatryan, Vardan; Sirunyan, A.M.; Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, Himali; Ralich, Robert M.; Vodopiyanov, Igor (2011-07-18)
      First measurements of dihadron correlations for charged particles are presented for central PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV over a broad range in relative pseudorapidity (∆η) and the ...
    • Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at √s=7 TeV 

      Chatrchyan, S.A.; Khachatryan, Vladimir A.; Sirunyan, A.M.; Tumasyan, A.R.; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor; Yumiceva, Francisco (2013-04-25)
      The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at √s=7 TeV is presented. The results are based on a data set corresponding to an integrated luminosity ...
    • Measurement of BB̄ angular correlations based on secondary vertex reconstruction at √s = 7 TeV 

      Khachatryan, Vardan; Sirunyan, A.M.; Tumasyan, A.R.; Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, Himali; Ralich, Robert M.; Vodopiyanov, Igor (2011-03-28)
      A measurement of the angular correlations between beauty and anti-beauty hadrons (BB¯) produced in pp collisions at a centre-of-mass energy of 7 TeV at the CERN LHC is presented, probing for the first time the region of ...
    • Measurement of jet fragmentation into charged particles in pp and PbPb collisions at √s NN = 2:76 TeV 

      Chatrchyan, S.; Khachatryan, Vardan; Sirunyan, A.M.; Tumasyan, A.R.; Adam, Wolfgang; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor (2012-10-12)
      Jet fragmentation in pp and PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair was studied using data collected with the CMS detector at the LHC. Fragmentation functions are constructed using ...
    • Measurement of the azimuthal anisotropy of neutral pions in Pb-Pb collisions at √sNN=2.76 TeV 

      Chatrchyan, S.A.; Khachatryan, Vladimir A.; Sirunyan, A.M.; Tumasyan, A.R.; Adam, W.; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor (2013-01-22)
      First measurements of the azimuthal anisotropy of neutral pions produced in Pb-Pb collisions at a center-of-mass energy of √sNN=2.76 TeV are presented. The amplitudes of the second Fourier component (v2) of the π0 azimuthal ...
    • Measurement of the Bs0 production cross section with Bs0→J/ψ Decays in pp collisions at √s=7TeV 

      Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, Himali; Ralich, Robert M.; Vodopiyanov, Igor; Chatrchyan, S. A.; Khachatryan, Vardan; Sirunyan, A. M. (2011-09-20)
      The Bs0 differential production cross section is measured as functions of the transverse momentum and rapidity in pp collisions at √s=7TeV, using the Bs0→J/ψ decay, and compared with predictions based on perturbative QCD ...