Publikációs adatbázis

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https://hdl.handle.net/2437/198859

Böngészés

Publikációs adatbázis Szerző szerinti böngészés "A. M. Sirunyan"

Megjelenítve 1 - 3 (Összesen 3)
  • Nincs kép
    TételSzabadon hozzáférhető
    Evidence for associated production of a single top quark and W Boson in pp collisions at √s=7 TeV
    S. Chatrchyan; V. Khachatryan; A. M. Sirunyan; J. Karancsi; P. Raics; Z. L. Trocsanyi; B. Ujvari; Karancsi János (1987-) (fizikus); Raics Péter (1944-) (fizikus); Trócsányi Zoltán (1961-) (fizikus); Ujvári Balázs (1977-) (Fizikus / PhD); Debreceni Egyetem
    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. The measurement is performed using events with two leptons and a jet originated from a b quark. A multivariate analysis based on kinematic properties is utilized to separate the tt̄ background from the signal. The observed signal has a significance of 4.0σ and corresponds to a cross section of 16-4+5 pb, in agreement with the standard model expectation of 15.6±0.4-1.2+1.0 pb.
  • Nincs kép
    TételSzabadon hozzáférhető
    Measurement of the inclusive jet cross section in pp collisions at √s = 2.76 TeV
    V. Khachatryan; A. M. Sirunyan; A. Tumasyan; M. Bartók; A. Makovec; P. Raics; Z. L. Trocsanyi; B. Ujvari; Bartók Márton (2024-) (xxx); Makovec Alajos (1987-) (fizikus); Raics Péter (1944-) (fizikus); Trócsányi Zoltán (1961-) (fizikus); Ujvári Balázs (1977-) (Fizikus / PhD); Fizikai Intézet -- 749; TTK; Debreceni Egyetem
    The double-differential inclusive jet cross section is measured as a function of jet transverse momentum pT and absolute rapidity |y|, using proton-proton collision data collected with the CMS experiment at the LHC, at a center-of-mass energy of √s = 2.76 TeV and corresponding to an integrated luminosity of 5.43 pb-1. Jets are reconstructed within the pT range of 74 to 592 GeV and the rapidity range |y|<3.0. The reconstructed jet spectrum is corrected for detector resolution. The measurements are compared to the theoretical prediction at next-to-leading-order QCD using different sets of parton distribution functions. This inclusive cross section measurement explores a new kinematic region and is consistent with QCD predictions.
  • Nincs kép
    TételSzabadon hozzáférhető
    Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs
    S. Chatrchyan; V. Khachatryan; A. M. Sirunyan; J. Karancsi; P. Raics; Z. L. Trocsanyi; B. Ujvari; Karancsi János (1987-) (fizikus); Raics Péter (1944-) (fizikus); Trócsányi Zoltán (1961-) (fizikus); Ujvári Balázs (1977-) (Fizikus / PhD); Debreceni Egyetem
    A study is presented of the mass and spin-parity of the new boson recently observed at the LHC at a mass near 125 GeV. An integrated luminosity of 17.3 fb-1, collected by the CMS experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV, is used. The measured mass in the ZZ channel, where both Z bosons decay to e or μ pairs, is 126.2±0.6(stat) ±0.2(syst) GeV. The angular distributions of the lepton pairs in this channel are sensitive to the spin-parity of the boson. Under the assumption of spin 0, the present data are consistent with the pure scalar hypothesis, while disfavoring the pure pseudoscalar hypothesis.