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Showing 1 to 20 of 83 for “"mass spectrum."”.
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Search For Contact Interactions Using The Dimuon Mass Spectrum In P-P Collisions At Sqrt(s) = 8 Tev At Cms
<p>The mass hierarchy problem associated with the standard model suggests that there might be more fundamental particles in nature. If quarks and leptons have substructures, known as preons, the manifestation of compositeness can be a four-fermion contact interaction. The experimental signal for …
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Measurement of the dipion mass spectrum in the decay X(3872) [right arrow] J/ [psi] [pi]⁺ [pi]⁻ at the CDFII experiment
We present a measurement of the dipion mass spectrum in the decay X(3872) [right arrow] J/ [psi] [pi]⁺ [pi]⁻ using a 360 pb-1 sample of pp collisions at av [square root]s = 1.96 TeV collected with the CDF II detector at the Fermnilab Tevatron Collider. As a benchmark, we also extract the dipion …
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On the relevance of adhesion : applications to Saturn's rings
… are crucially determined by the impact speed and masses of the collision partners and yield a maximal impact velocity at which agglomeration still occurs. Based on the latter, a self-consistent kinetic concept is proposed. The model considers all possible collisional outcomes as there are …
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ΦΑΣΜΑ ΜΑΖΩΝ ΑΒΕΛΙΑΝΩΝ ΘΕΩΡΙΩΝ ΒΑΘΜΙΔΑΣ ΣΕ ΤΡΙΔΙΑΣΤΑΤΟ ΧΩΡΟΧΡΟΝΙΚΟ ΠΛΕΓΜΑ
WE STUDIED THE MESSONIC MASS SPECTRUM OF AN OBELIAN GAUGE THEORY IN (2+1) -DIM ON A SPACE-TIME LATTICE. WE FOUND THAT AN SU(2) GLOBAL SYMMETRY WHICH CHARACTERIZED THE MODEL WAS BROKEN DYNAMICALLY. IF WE TAKE INTO ACCOUNT THE FERMIONIC DEGREES OF FREEDOM THIS BREAKDOWN APPEARS TO BE STRONGER. THE …
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A measurement of the mass of the W vector boson from antiproton proton going to charged W boson going to muon muon neutrino at 1.8 TeV
This thesis presents a measurement of the mass of the W boson using data collected during the 1992-93 collider run at the Fermilab Tevatron with the CDF detector. A fit to the transverse mass spectrum of a sample of 3268 $\rm W\to\mu\nu$ events from 19.7 $\rm pb\sp{-1}$ of data yields a mass of …
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A-2 meson production in pi-minus proton interactions at five BeV
… is treated in detail. Fit.s to the 3TI invariant mass spectrum yield a central mass value and width of 1.296±.008 and .l05±.035 BeV. respectively, for the A2 when the events are treated as constituting a single resosant particle. Limited statistics render inconclusive an investigation of a …
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Search for semileptonic decays of photoproduced charmed mesons
… for D production is observed based on the Ksnpi± mass spectrum. The sensitivity of the search is commensurate with theoretical estimates of sigma(yp -> DD + X)~500 nb, however this is dependent on branching ratios and photoproduction models. An appendix contains data on a similar search for …
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Study of D-star mesons produced in electron positron annihilations at 4.14 GeV center of mass energy
… produced in e+e-annihilations at a center of mass energy of 4.14 GeV are observed by the Mark III detector at SPEAR. The recoil mass spectrum of the D mesons is used to extract the branching fractions of the charged and neutral D*. Measurements are presented for the two decay modes of the D*O …
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Analysis of Excited B Mesons with the OPAL Detector at LEP
… the number of <br>signal candidates in the B pi mass spectra of the two samples, the first measurement of the branching ratio of orbitally-excited B mesons <br>decaying into B* pi (pi) is performed. In the framework of Heavy Quark Symmetry, a fit to the total B pi mass spectrum and a simultaneous …
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Measurement of the W boson mass with the ALEPH detector
The W boson mass has been extracted using W-pairs decaying into evqq and mvqq final states. The events were selected from the data collected with the ALEPH detector during the years 1998, 1999 and 2000, corresponding to a total integrated luminosity of about 650 pb-1. A kinematic fit imposing …
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Machine Learning Methods for Discovering Metabolite Structures from Mass Spectra
… cancer biology, and various other processes. Mass spectrometry is often used as an analytical technique to investigate the small molecules present in a sample, measuring both their masses and fragmentation spectra. However, the complexity and high dimensionality of spectral data makes it …
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Potential Energy Surface around the Tropylium Ion.
… C<sub>7</sub>H<sub>7</sub><sup>+</sup>, in the mass spectrum of toluene is a chemical process that has been studied extensively in the past. The advances in computational power of personal computers have made the investigation of the pathway to form this ion and its subsequent decomposition …
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Fundamental Investigations of Mechanistic Pathways of Selected Organic Reactive Intermediates
… exist in these species was determined by a mass spectral investigation that was designed to monitor alkyl side-chain isomerizaitons. Also, the amount of it-complex was determined for each compound by measuring the amount of alkyl carbenium ion loss in each compound's mass spectrum. Found …
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Measurement of |vcb| Using the Semileptonic Decay Λb → Λcμνμ
… μ−νμ is isolated by a fit to the Λb corrected mass spectrum. The raw yield NRaw(Λ0b → Λ+c μ−νμ) is corrected, and the semileptonic width ΓMeas. (Λ0b → Λ+c μ−νμ) is obtained. Lattice QCD calculations predict ΓTh.(Λ0b → Λ+c μ−νμ)/|Vcb|2. A comparison between the measured and predicted widths …
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Search For Trilepton Resonances From R-Parity Violating Chargino Decays In The B−l Mssm
… for resonances in the trilepton invariant mass spectrum, targeting events with charginos decaying to three electrons or muons via a leptonically decaying Z boson. The dataset includes 139 1/fb of 13 TeV proton-proton collisions produced at the Large Hadron Collider and collected by the …
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Production of K+K - and ppbar pairs in high energy photoproduction
… the elastic cross section rise by 25%. At K+K-masses higher than the phi, we see an enhancement centered at 1.72 ± .02 GeV, with a width of .12 ± .05 GeV. We measure the cross section to be 8.0 ± 2.8 nb/nucleon, with an additional systematic error of 16%. Measurements are made of its production …
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Fokker-Planck models and globular cluster evolution
… 6397. The first set of models studied includes a mass spectrum, a tidal boundary and allows for a central energy source from the formation, hardening and destruction of binaries formed in three-body interactions. These models are compared to star-count mass functions and surface density profiles …
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Investigation of Primary Ion Formation Mechanisms in UV-MALDI-MS Using Excited State Dynamics of Common MALDI Matrices
… primary ionization mechanisms within MALDI mass spectrometry. Albeit MALDI-MS is an extensively used analytical technique, the mechanism in which primary ions are created is still under scrutiny. Two current models of primary ionization exist which claim to elucidate the ion formation …
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Stochastic Microlensing: Mathematical Theory and Applications
… uniform stars' distribution with</p><p> constant mass spectrum and the spatial stars' distribution with general mass spectrum. For each scenario, we determine exact and asymptotic (in the large number</p><p> of point masses limit) stochastic properties of the random time delay functions and …
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Semiclassical Methods in Field Theories: The Use of Soliton and Instanton
… the effective potentials and compare the mass spectrum with that obtained from the path integral approximation. The second part of this thesis concerns with the instanton physics in Sigma model and in nonabelian gauge theory. An instanton solution defines a dominant collective coordinate. …
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