Showing papers by "G. Tzanakos published in 2014"
Fermilab1, Iowa State University2, University of Cincinnati3, University of Oxford4, Brookhaven National Laboratory5, University of Cambridge6, University of Texas at Austin7, Universidade Federal de Goiás8, Tufts University9, Indiana University10, University of Minnesota11, College of William & Mary12, University of Sussex13, State University of Campinas14, University of Manchester15, Harvard University16, College of the Holy Cross17, Argonne National Laboratory18, University of São Paulo19, University of Pittsburgh20, University of Warsaw21, California Institute of Technology22, University College London23, Stanford University24, Rutherford Appleton Laboratory25, University of South Carolina26, Illinois Institute of Technology27, Otterbein University28, National and Kapodistrian University of Athens29, Texas A&M University30, University of Houston31
TL;DR: A new analysis of neutrino oscillations in MINOS using the complete set of accelerator and atmospheric data using the three-flavor formalism and constrain δ(CP), the θ(23} octant degeneracy and the mass hierarchy is reported.
Abstract: We report on a new analysis of neutrino oscillations in MINOS using the complete set of accelerator and atmospheric data. The analysis combines the ν_μ disappearance and ν_e appearance data using the three-flavor formalism. We measure |Δm^2_(32)|=[2.28–2.46]×10^(−3) eV^2 (68% C.L.) and sin^2θ_(23)=0.35–0.65 (90% C.L.) in the normal hierarchy, and |Δm^2_(32)|=[2.32–2.53]×10^(−3) eV^2 (68% C.L.) and sin2θ23=0.34–0.67 (90% C.L.) in the inverted hierarchy. The data also constrain δ_(CP), the θ_(23) octant degeneracy and the mass hierarchy; we disfavor 36% (11%) of this three-parameter space at 68% (90%) C.L.
252 citations
College of William & Mary1, Pontifical Catholic University of Peru2, Fermilab3, University of Rochester4, Federico Santa María Technical University5, University of Pittsburgh6, Russian Academy of Sciences7, Hampton University8, University of Minnesota9, Universidad de Guanajuato10, Northwestern University11, Tufts University12, University of Florida13, National University of Engineering14, University of Texas at Austin15, Rutgers University16, Massachusetts College of Liberal Arts17, James Madison University18, University of Chicago19, University of California, Irvine20, Otterbein University21, National and Kapodistrian University of Athens22
11 Apr 2014-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The MINERvA detector as mentioned in this paper is composed of a finely segmented scintillator-based inner tracking region surrounded by electromagnetic and hadronic sampling calorimetry.
Abstract: The MINERvA 6 experiment is designed to perform precision studies of neutrino-nucleus scattering using ν μ and ν ¯ μ neutrinos incident at 1–20 GeV in the NuMI beam at Fermilab. This article presents a detailed description of the MINERvA detector and describes the ex situ and in situ techniques employed to characterize the detector and monitor its performance. The detector is composed of a finely segmented scintillator-based inner tracking region surrounded by electromagnetic and hadronic sampling calorimetry. The upstream portion of the detector includes planes of graphite, iron and lead interleaved between tracking planes to facilitate the study of nuclear effects in neutrino interactions. Observations concerning the detector response over sustained periods of running are reported. The detector design and methods of operation have relevance to future neutrino experiments in which segmented scintillator tracking is utilized.
191 citations
01 Jan 2014
TL;DR: In this article, the authors present a survey of the authors of this paper and their colleagues in terms of their work in the field of computer science: 3 P.A. Schmitz, 3 C.E. Howley, K.S. McFarland, 3 K.C. Ochoa, C.M. Martinez Caicedo, 3.
Abstract: G.A. Fiorentini, D.W. Schmitz, 3 P.A. Rodrigues, L. Aliaga, 6 O. Altinok, B. Baldin, A. Baumbaugh, A. Bodek, D. Boehnlein, S. Boyd, R. Bradford, W.K. Brooks, H. Budd, A. Butkevich, D.A. Martinez Caicedo, 3 C.M. Castromonte, M.E. Christy, H. Chung, J. Chvojka, M. Clark, H. da Motta, D.S. Damiani, I. Danko, M. Datta, M. Day, R. DeMaat, ∗ J. Devan, E. Draeger, S.A. Dytman, G.A. Diaz, B. Eberly, D.A. Edmondson, J. Felix, L. Fields, T. Fitzpatrick, ∗ A.M. Gago, H. Gallagher, C.A. George, J.A. Gielata, C. Gingu, B. Gobbi, ∗ R. Gran, N. Grossman, J. Hanson, D.A. Harris, J. Heaton, A. Higuera, I.J. Howley, K. Hurtado, 15 M. Jerkins, T. Kafka, J. Kaisen, M.O. Kanter, C.E. Keppel, † J. Kilmer, M. Kordosky, A.H. Krajeski, S.A. Kulagin, T. Le, H. Lee, A.G. Leister, G. Locke, G. Maggi, ‡ E. Maher, S. Manly, W.A. Mann, C.M. Marshall, K.S. McFarland, 3 C.L. McGivern, A.M. McGowan, A. Mislivec, J.G. Morfin, J. Mousseau, D. Naples, J.K. Nelson, G. Niculescu, I. Niculescu, N. Ochoa, C.D. O’Connor, J. Olsen, B. Osmanov, J. Osta, J.L. Palomino, V. Paolone, J. Park, C.E. Patrick, G.N. Perdue, C. Pena, L. Rakotondravohitra, § R.D. Ransome, H. Ray, L. Ren, C. Rude, K.E. Sassin, H. Schellman, R.M. Schneider, E.C. Schulte, ¶ C. Simon, F.D. Snider, M.C. Snyder, J.T. Sobczyk, 3 C.J. Solano Salinas, N. Tagg, W. Tan, B.G. Tice, G. Tzanakos, ∗ J.P. Velasquez, J. Walding, ∗∗ T. Walton, J. Wolcott, B.A. Wolthuis, N. Woodward, G. Zavala, H.B. Zeng, D. Zhang, L.Y. Zhu, and B.P. Ziemer
81 citations
TL;DR: In this article, a study of the production of top-quark pairs together with heavy-flavor quarks, collectively referred to as (tt) over bar + HF, was performed.
Abstract: Using a sample of dilepton top-quark pair ((tt) over bar) candidate events, a study is performed of the production of top-quark pairs together with heavy-flavor (HF) quarks, the sum of (tt) over bar + b + X and (tt) over bar + c + X, collectively referred to as (tt) over bar + HF. The data set used corresponds to an integrated luminosity of 4.7 fb(-1) of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. The presence of additional HF (b or c) quarks in the (tt) over bar sample is inferred by looking for events with at least three b-tagged jets, where two are attributed to the b quarks from the (tt) over bar decays and the third to additional HF production. The dominant background to (tt) over bar + HF in this sample is (tt) over bar + jet events in which a light-flavor jet is misidentified as a heavy-flavor jet. To determine the heavy-and light-flavor content of the additional b-tagged jets, a fit to the vertex mass distribution of b-tagged jets in the sample is performed. The result of the fit shows that 79 +/- 14 (stat) +/- 22 (syst) of the 105 selected extra b-tagged jets originate from HF quarks, 3 standard deviations away from the hypothesis of zero (tt) over bar + HF production. The result for extra HF production is quoted as a ratio (R-HF) of the cross section for (tt) over bar + HF production to the cross section for (tt) over bar production with at least one additional jet. Both cross sections are measured in a fiducial kinematic region within the ATLAS acceptance. R-HF is measured to be [6.2 +/- 1.1(stat) +/- 1.8 (syst)]% for jets with p(T) > 25 GeV and vertical bar eta vertical bar < 2.5, in agreement with the expectations from Monte Carlo generators.
30 citations
TL;DR: In this paper, a measurement of the phi to K+K- production cross section at 7 TeV using pp collision data corresponding to an integrated luminosity of 383 mub-1, collected with the ATLAS experiment at the LHC.
Abstract: A measurement is presented of the phi to K+K- production cross section at sqrt(s) = 7 TeV using pp collision data corresponding to an integrated luminosity of 383 mub-1, collected with the ATLAS experiment at the LHC. Selection of phi(1020) mesons is based on the identification of charged kaons by their energy loss in the pixel detector. The differential cross section is measured as a function of the transverse momentum, pTphi, and rapidity, |yphi|, of the phi(1020) meson in the fiducial region 500 230 MeV and kaon momentum pK< 800 MeV.The integrated phi(1020)-meson production cross section in this fiducial range is measured to be s(phi K+K-) = 570 pm 8 (stat) pm 66 (syst) pm 20 (lumi) mub.
17 citations
01 Jan 2014
TL;DR: A study of ν(μ) charged-current quasielastic events in the segmented scintillator inner tracker of the MINERvA experiment running in the NuMI neutrino beam at Fermilab finds an excess of energy near the vertex consistent with multiple protons in the final state.
7 citations