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Sample records for antimuons

  1. Measurement of the transverse momentum differential cross-section for Z boson decays to muon anti-muon events in proton anti-proton collisions at center-of-mass energy = 1.8-TeV

    Energy Technology Data Exchange (ETDEWEB)

    Krasberg, Mark T. [Univ. of Michigan, Ann Arbor, MI (United States)

    2003-01-01

    In 1961 Sheldon Lee Glashow, while working on electroweak unification gauge theory, developed a model in which he introduced a massive neutral intermediate vector boson, call Z [1], [2], [3]. By 1967 Steven Weinberg and Abdus Salam had independently solved the theoretical problems with this model and developed their own self-consistent theory. In this thesis the Z gauge boson production rate at CDF as a function of the Z transverse momentum is studied in the dimuon channel.

  2. First Measurement of $\

    Energy Technology Data Exchange (ETDEWEB)

    Palomino Gallo, Jose Luis [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro (Brazil)

    2012-12-01

    Understanding of the $\\pi^0$ production via anti-neutrino-nucleus charged current interaction in the neutrino energy region of 1-10 GeV is essential for neutrino oscillation experiments. In this thesis, we present a measurement of charged current $\\pi^0$ production from anti-muon neutrinos scattering on a polystyrene scintillator (CH) target in the MINER$\

  3. Measurement of the inclusive Z+b anti b cross section in pp-collisions at 7 TeV with ATLAS

    International Nuclear Information System (INIS)

    Hellmich, Dennis

    2014-07-01

    In this thesis, the measurement of the inclusive cross section of the process Z+b anti b is measured where the Z can decay to an electron-positron pair or to a muon-antimuon pair. The analysed data was recorded by the ATLAS experiment in 2011 at a centre-of-mass energy of √(s)=7 TeV and includes 4.58 fb -1 of proton-proton collisions. The resulting cross sections are unfolded to particle level and compared to LO and NLO predictions from different Monte Carlo generators.

  4. The Muon g-2 Experiment Overview and Status as of June 2016

    Science.gov (United States)

    Holzbauer, J.

    2016-11-01

    The Muon g-2 Experiment at Fermilab will measure the anomalous magnetic moment of the muon to a precision of 140 parts per billion, which is a factor of four improvement over the previous E821 measurement at Brookhaven. The experiment will also extend the search for the electric dipole moment (EDM) of the muon by approximately two orders of magnitude, with a sensitivity down to 10-21 e.cm. Both of these measurements are made by combining a precise measurement of the 1.45T storage ring magnetic field with an analysis of the modulation of the decay rate of higher-energy positrons (from anti-muons), recorded by 24 calorimeters and 3 straw tracking detectors. The recent progress in the alignment of the electrostatic quadrapole plates and the trolley rails inside the vacuum chambers, and in establishing the uniform storage ring magnetic field will be described.

  5. Search for high-mass dilepton resonances in 20/fb of pp collisions at sqrt(s) = 8 TeV with the ATLAS experiment

    CERN Document Server

    Coggeshall, J; The ATLAS collaboration

    2013-01-01

    The ATLAS detector is used to search for heavy neutral gauge bosons (Z′) decaying to an electron-positron pair or a muon-antimuon pair. Results are presented based on the analysis of pp collisions at a center-of-mass energy of 8 TeV corresponding to an integrated luminosity of approximately 20 fb−1. A Z′ with Standard Model Z couplings to fermions is excluded at 95\\% C.L. for masses below 2.79 TeV in the electron channel, 2.48 TeV in the muon channel, and 2.86 TeV in the two channels combined. Limits on other model interpretations are also presented, including a Grand Unification model based on the E6 gauge group, a Randall-Sundrum graviton and a technicolor model with a composite Higgs boson.

  6. The Muon g-2 Experiment Overview and Status

    Energy Technology Data Exchange (ETDEWEB)

    Holzbauer, J. L. [Mississippi U.

    2017-12-16

    The Muon g-2 experiment at Fermilab will measure the anomalous magnetic moment of the muon to a precision of 140 parts per billion, which is a factor of four improvement over the previous E821 measurement at Brookhaven. The experiment will also extend the search for the muon electric dipole moment (EDM) by approximately two orders of magnitude. Both of these measurements are made by combining a precise measurement of the 1.45T storage ring magnetic field with an analysis of the modulation of the decay rate of the higher-energy positrons from the (anti-)muon decays recorded by 24 calorimeters and 3 straw tracking detectors. The current status of the experiment as well as results from the initial beam delivery and commissioning run in the summer of 2017 will be discussed.

  7. submitter Étude de la production de paires de bosons Z à grande masse invariante dans des collisions proton-proton à √ s = 8 TeV auprès de l’expérience CMS

    CERN Document Server

    Postiau, Nicolas

    In this Master Thesis, we study the Z boson pair production in proton-proton collisions at 8 TeV in the center-of-mass collision frame, from the data collected in 2012 by the CMS experiment. This study is performed in the final states containing two electron-antielectron or muon-antimuon pairs. Our goals are to compute the cross section of the process, and to study the electroweak corrections applied to it. These electroweak corrections have only recently been computed, and are for the first time compared with experimental data in these final states. We first identify the sub-processes, at different orders in αS, contributing to the Z boson pair production in simulated samples from specific generators and we compare these contributions to the published results. We then introduce a parameterization of these electroweak corrections to the dominant sub-process qq¯ → ZZ and compare the distributions to the compared results. We compare the data and the Monte-Carlo simulations, corrected for NLO electroweak eff...

  8. Search for Physics beyond the Standard Model with the ATLAS detector and the development of radiation detectors

    CERN Document Server

    Silver, Yiftah

    We are investigating a radiation detector based on plasma display panel technology, the principal component of plasma television displays. This Plasma Panel Sensor (PPS) technology is a variant of micro-pattern gas radiation detectors. Based on the properties of existing plasma display panels, we expect eventually to be able to build a sealed array of plasma discharge gas cells to detect ionizing radiation with fast rise time of less than 10ns and high spatial resolution using a pixel pitch of less than 100 micrometer. In this thesis I shall describe our program of testing plasma display panels as detectors, including simulations, design and the first laboratory and beam studies that demonstrate the detection of cosmic ray muons, beta rays and medium energy protons. The ATLAS detector is used to search for high-mass resonances, in particular heavy neutral gauge bosons (Z') and excited states of Kaluza-Klein γ/Z bosons decaying to an electron-positron pair or a muon-antimuon pair. Results are presented based ...

  9. Search for the Higgs boson in $H \\to \\mu^+ \\mu^-$ decays with the ATLAS detector at the LHC

    CERN Document Server

    Honig, Friedrich G

    2013-01-01

    For the last decades, the Standard Model (SM) has been most successful in describing virtually all phenomena of particle physics. All matter particles and all force carriers predicted by the SM have been found and studied experimentally. The last missing piece was the Higgs boson, a result of the mechanism that generates the mass of all massive particles. A candidate boson has now been found by the ATLAS and CMS collaborations. The next experimental step is the measurement of its properties. This includes the coupling to fermions such as muons. The direct decay of Higgs bosons into muon-antimuon pairs is studied in this analysis. A search for this decay is performed using 20.7 fb$^{-1}$ of $\\sqrt{s}$ = 8 TeV proton-proton collision data recorded by the ATLAS detector at the LHC in 2012. The invariant mass spectrum of dimuon events is examined using a combined fit of a background and a signal parametrization to this data. No significant excess has been found. Exclusion limits on the strength of this signal hav...

  10. EVENT GENERATION OF STANDARD MODEL HIGGS DECAY TO DIMUON PAIRS USING PYTHIA SOFTWARE

    CERN Document Server

    Yusof, Adib

    2015-01-01

    My project for CERN Summer Student Programme 2015 is on Event Generation of Standard Model Higgs Decay to Dimuon Pairs using Pythia Software. Briefly, Pythia or specifically, Pythia 8.1 is a program for the generation of high-energy Physics events that is able to describe the collisions at any given energies between elementary particles such as Electron, Positron, Proton as well as anti-Proton. It contains theory and models for a number of Physics aspects, including hard and soft interactions, parton distributions, initial-state and final-state parton showers, multiparton interactions, fragmentation and decay. All programming code is to be written in C++ language for this version (the previous version uses FORTRAN) and can be linked to ROOT software for displaying output in form of histogram. For my project, I need to generate events for standard model Higgs Boson into Muon and anti-Muon pairs (H→μ+ μ) to study the expected significance value for this particular process at centre-of-mass energy of 13 TeV...

  11. Measurement of the underlying event using track-based event shapes in Z→l{sup +}l{sup -} events with ATLAS

    Energy Technology Data Exchange (ETDEWEB)

    Schulz, Holger

    2014-09-11

    This thesis describes a measurement of hadron-collider event shapes in proton-proton collisions at a centre of momentum energy of 7 TeV at the Large Hadron Collider (LHC) at CERN (Conseil Europeenne pour la Recherche Nucleaire) located near Geneva (Switzerland). The analysed data (integrated luminosity: 1.1 fb{sup -1}) was recorded in 2011 with the ATLAS-experiment. Events where a Z-boson was produced in the hard sub-process which subsequently decays into an electron-positron or muon-antimuon pair were selected for this analysis. The observables are calculated using all reconstructed tracks of charged particles within the acceptance of the inner detector of ATLAS except those of the leptons of the Z-decay. Thus, this is the first measurement of its kind. The observables were corrected for background processes using data-driven methods. For the correction of so-called ''pile-up'' (multiple overlapping proton-proton collisions) a novel technique was developed and successfully applied. The data was further unfolded to correct for remaining detector effects. The obtained distributions are especially sensitive to the so-called ''Underlying Event'' and can be compared with predictions of Monte-Carlo event-generators directly, i.e. without the necessity of running time-consuming simulations of the ATLAS-detector. Finally, it was tried to improve the predictions of the event generators Pythia8 and Sherpa by finding an optimised setting of relevant model parameters in a technique called ''Tuning''. It became apparent, however, that the underlying Sjoestrand-Zijl model is unable to give a good description of the measured event-shape distributions.