Now showing items 2008-2027 of 3310

    • Observation of a peaking structure in the J/ψφ mass spectrum from B±→J/ψφK± decays 

      Chatrchyan, S.; Khachatryan, Vardan; Sirunyan, A.M.; Tumasyan, A.; Adam, Wolfgang; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Yumiceva, Francisco (2014-06-22)
      A peaking structure in the J/ψφ mass spectrum near threshold is observed in B± → J/ψφK± decays, produced in pp collisions at √s = 7 TeV collected with the CMS detector at the LHC. The data sample, selected on the basis ...
    • Observation of Charge-Dependent Azimuthal Correlations in p-Pb Collisions and Its Implication for the Search for the Chiral Magnetic Effect 

      Khachatryan, V.; Tumasyan, A.; Sirunyan, A.M.; Baarmand, M.M.; Bhopatkar, Vallary; Colafranceschi, Stefano; Hohlmann, Marcus; Noonan, D.; Roy, Tuhin S.; Yumiceva, Francisco X. (2017-03-24)
      Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p-Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at ...
    • Observation of Correlated Azimuthal Anisotropy Fourier Harmonics in pp and p+Pb Collisions at the LHC 

      Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang; Baarmand, Marc M.; Bhopatkar, Vallary; Colafranceschi, Stefano; Hohlmann, Marcus; Noonan, Daniel; Roy, Tuhin S.; Yumiceva, F. (2018-02-26)
      The azimuthal anisotropy Fourier coefficients (vn) in 8.16 TeV p+Pb data are extracted via long-range two-particle correlations as a function of the event multiplicity and compared to corresponding results in pp and PbPb ...
    • Observation of direct-photon collective flow in Au+Au collisions at √S<inf>NN</inf> = 200 GeV 

      Baksay, Gyöngyi; Baksay, László A.; Aoki, Kazuya; Alexander, John M.; Al-Bataineh, H.; Akiba, Yasuyuki; Ajitanand, N. N.; Aidala, Christine A.; Afanasiev, Sergey V.; Hohlmann, Marcus (2012-09-12)
      The second Fourier component v2 of the azimuthal anisotropy with respect to the reaction plane is measured for direct photons at midrapidity and transverse momentum (pT) of 1–12 GeV=c in Au þ Au collisions at ...
    • Observation of Electroweak Production of Same-Sign W Boson Pairs in the Two Jet and Two Same-Sign Lepton Final State in Proton-Proton Collisions at s =13 TeV 

      Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang; Baarmand, Marc M.; Bhopatkar, Vallary; Colafranceschi, Stefano; Hohlmann, Marcus; Noonan, Daniel; Roy, Tuhin S.; Yumiceva, F. (2018-02-22)
      The first observation of electroweak production of same-sign W boson pairs in proton-proton collisions is reported. The data sample corresponds to an integrated luminosity of 35.9 fb-1 collected at a center-of-mass energy ...
    • Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC 

      Khachatryan, Vardan; Sirunyan, A.M.; Tumasyan, A.R.; Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, Himali; Ralich, Robert M.; Vodopiyanov, Igor (2010-09-27)
      Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a ...
    • Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC 

      Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, H.; Ralich, Robert M.; Vodopiyanov, Igor; Khachatryan, Vardan; Sirunyan, A. M.; Tumasyan, A. R. (2010-09)
      esults on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7TeV are presented, using data collected with the CMS detector over a broad ...
    • Observation of sequential Υ suppression in PbPb collisions 

      Sirunyan, A.M.; Chatrchyan, S. A.; Khachatryan, Vardan; Tumasyan, A. R.; Wolfgang, Adam; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, H.; Vodopiyanov, Igor B. (2012-11-26)
      The suppression of the individual ðnSÞ states in PbPb collisions with respect to their yields in pp data has been measured. The PbPb and pp data sets used in the analysis correspond to integrated luminosities of 150 b ...
    • Observation of the associated production of a single top quark -and a W boson in pp collisions at s =8TeV 

      Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, H.; Yumiceva, Francisco X.; Chatrchyan, S. A.; Khachatryan, Vladimir A.; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang (2014-06-09)
      The first observation of the associated production of a single top quark and a W boson is presented. The analysis is based on a data set corresponding to an integrated luminosity of 12.2fb-1 of proton-proton collisions at ...
    • Observation of the decay B+ → ψ(2S)ϕ(1020)K+ in pp collisions at s=8TeV 

      Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Baarmand, M.M.; Bhopatkar, Vallary; Roy, Tuhin S.; Colafranceschi, Stefano; Noonan, D.; Hohlmann, Marcus; Yumiceva, Francisco X. (2017-01-10)
      The decay B+→ψ(2S)ϕ(1020)K+ is observed for the first time using data collected from pp collisions at s=8TeV by the CMS experiment at the LHC, corresponding to an integrated luminosity of 19.6fb−1. The branching fraction ...
    • Observation of top quark pairs produced in association with a vector boson in pp collisions at √s = 8 TeV 

      Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Baarmand, M.M.; Bhopatkar, Vallary; Noonan, D.; Colafranceschi, Stefano; Hohlmann, Marcus; Roy, Tuhin S.; Yumiceva, Francisco X. (2016-01-18)
      Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb-1, collected by the CMS ...
    • Observation of Top Quark Production in Proton-Nucleus Collisions 

      Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang; Baarmand, Marc M.; Bhopatkar, Vallary; Colafranceschi, Stefano; Hohlmann, Marcus; Noonan, Daniel; Roy, Tuhin S.; Yumiceva, Francisco X. (2017-12-14)
      The first observation of top quark production in proton-nucleus collisions is reported using proton-lead data collected by the CMS experiment at the CERN LHC at a nucleon-nucleon center-of-mass energy of sNN=8.16 TeV. The ...
    • Observation of Y(1S) pair production in proton-proton collisions at √s=8 TeV 

      The CMS collaboration; Khachatryan, V.; Sirunyan, A.M.; Baarmand, M.M.; Bhopatkar, Vallary; Colafranceschi, Stefano; Noonan, D.; Hohlmann, Marcus; Roy, Tuhin S.; Yumiceva, Francisco X. (2017-05-03)
      Pair production of Y(1S) mesons is observed at the LHC in proton-proton collisions at s=8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb−1. Both Y(1S) candidates are fully ...
    • Observation of Z decays to four leptons with the CMS detector at the LHC 

      Chatrchyan, S.; Khachatryan, Vardan; Sirunyan, A.M.; Tumasyan, A.R.; Adam, Wolfgang; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, Himali; Vodopiyanov, Igor (2012-12-07)
      The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb−1 at √s = 7 TeV collected by the CMS detector ...
    • Observation-constrained modeling of the ionospheric impact of negative sprites 

      Liu, Ningyu; Boggs, Levi D.; Cummer, Steven A. (2016-03-28)
      This paper reports observation and modeling of five negative sprites occurring above two Florida thunderstorms. The sprites were triggered by unusual types of negative cloud-to-ground (CG) lightning discharges with impulse ...
    • Observational constraints on the degenerate mass-radius relation 

      Holberg, Jay B.; Oswalt, Terry D.; Barstow, M. A. (2012-02-09)
      The white dwarf mass-radius relationship is fundamental to modern astrophysics. It is central to routine estimation of DA white dwarf masses derived from spectroscopic temperatures and gravities. It is also the basis for ...
    • OBSERVATIONS of AN ENERGETICALLY ISOLATED QUIET SUN TRANSIENT: EVIDENCE of QUASI-STEADY CORONAL HEATING 

      Orange, Norton Brice; Chesny, David L.; Oluşeyi, Hakeem M. (2015-09-10)
      Increasing evidence for coronal heating contributions from cooler solar atmospheric layers, notably quiet Sun (QS) conditions, challenges standard solar atmospheric descriptions of bright transition region (TR) emission. ...
    • Observations of stepping mechanisms in a rocket-and-wire triggered lightning flash 

      Biagi, Christopher J.; Uman, Martin A.; Jordan, Douglas M.; Rakov, Vladimir A.; Dwyer, Joseph R.; Hill, Jonathan D. (2010-12-14)
      We present 10 high-speed video images that depict the bottom 150 m of a downward-negative, dart-stepped leader in a rocket-and-wire triggered flash, recorded at 240 kiloframes per second (4.17 μs frame integration time), ...
    • Observations of the pulsating white dwarf G 185-32 

      Castanheira, Bárbara Garcia; Kepler, Souza Oliveira; Moskalik, Paweł A.; Zoła, Stanislaw; Pajdosz, G.; Krzensiński, J.; O'Donoghue, Darragh E.; Katz, Marshall E.; Buckley, David A H; Wood, Matt A. (2004-01)
      We observed the pulsating hydrogen atmosphere white dwarf G 185-32 with the Whole Earth Telescope in 1992. We report on a weighted Fourier transform of the data detecting 18 periodicities in its light curve. Using the ...
    • Obtaining Objective Measurements of Reaction Times to Auditory Alarms 

      Neubauer, Andrew George (2000-05)
      Several pulse parameters that were believed to affect response time to auditory alarms were investigated in a factorial experiment. 18 subjects, (14 male, 4 female), participated in an experiment where the effects of ...