364 research outputs found
New states above charm threshold
We revise and extend expectations for the properties of charmonium states
that lie above charm threshold, in light of new experimental information. We
refine the Cornell coupled-channel model for the coupling of c-cbar levels to
two-meson states, defining resonance masses and widths by pole positions in the
complex energy plane, and suggest new targets for experiment.Comment: 12 pages, 4 figures, uses RevTeX. Added references. Corrects
transcription error for 3D1 states in Table II
On The Origin Of The Mass-Metallicity Relation For GRB Host Galaxies
We investigate the nature of the mass-metallicity (M-Z) relation for long
gamma-ray burst (LGRB) host galaxies. Recent studies suggest that the M-Z
relation for local LGRB host galaxies may be systematically offset towards
lower metallicities relative to the M-Z relation defined by the general star
forming galaxy (SDSS) population. The nature of this offset is consistent with
suggestions that low metallicity environments may be required to produce high
mass progenitors, although the detection of several GRBs in high-mass,
high-metallicity galaxies challenges the notion of a strict metallicity cut-off
for host galaxies that are capable of producing GRBs. We show that the nature
of this reported offset may be explained by a recently proposed
anti-correlation between the star formation rate (SFR) and the metallicity of
star forming galaxies. If low metallicity galaxies produce more stars than
their equally massive, high-metallicity counterparts, then transient events
that closely trace the SFR in a galaxy would be more likely to be found in
these low metallicity, low mass galaxies. Therefore, the offset between the GRB
and SDSS defined M-Z relations may be the result of the different methods used
to select their respective galaxy populations, with GRBs being biased towards
low metallicity, high SFR, galaxies. We predict that such an offset should not
be expected of transient events that do not closely follow the star formation
history of their host galaxies, such as short duration GRBs and SN Ia, but
should be evident in core collapse SNe found through upcoming untargeted
surveys.Comment: 6 pages, 4 figures, submitted to ApJ
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Single top quark production at D0
We present first evidence for the production of single top quarks at the Fermilab Tevatron p{bar p} collider. Using a 0.9 fb{sup -1} dataset, we apply a multivariate analysis to separate signal from background and measure cross section for single top quark production. We use the cross section measurement to directly determine the CKM matrix element that describes the Wtb coupling. We also present results of W0 and charged Higgs searches with the same final states as standard model single top quark production
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Search for techniparticles at D0 Run II
Technicolor theory (TC) accomplishes the necessary electroweak symmetry breaking responsible for the mass of the elementary particles. TC postulates the existence of a new SU(N{sub TC}) gauge theory. Like QCD the exchange of gauge bosons causes the existence of a non-vanishing chiral condensate which dynamically breaks the SU(N{sub TC}){sub L} x SU(N{sub TC}){sub R} symmetry. This gives rise to N{sub TC}{sup 2}-1 Nambu-Goldstone Bosons. Three of these Goldstone Bosons become the longitudinal components of the W{sup {+-}} and Z which therefore acquire mass; the remaining ones are new particles (technihadrons) that can be produced at the high energy colliders and detected. The Technicolor Straw Man Model (TCSM) is a version of the dynamical symmetry breaking with a large number of technifermions and a relative low value of their masses. One of the processes predicted by the TCSM is q{bar q} {yields} V{sub T} {yields} W{pi}{sub T}, where V{sub T} is the Technicolor equivalent of the QCD vector meson and {pi}{sub T} is the equivalent of the pion. W is the electroweak gauge boson of the Standard Model. This dissertation describes the search for W{pi}{sub T} with the D0 detector, a multi-purpose particle detector located at one of the collision points of the Tevatron accelerator situated in Batavia, IL. The final state considered for this thesis is a W boson that decays to electron and neutrino plus a {pi}{sub T} that decays into b{bar c} or b{bar b}, depending on the charge of the initial technivector meson produced. In the D0 detector this process will appear as a narrow cluster of energy deposits in the electromagnetic calorimeter with an associated track reconstructed in the tracking detector. The undetected neutrino from the decay of the W boson will be seen as missing momentum. The fragmentation of the quarks from the decay of the {pi}{sub T} will produce two jets of collimated particles. Events where a b-quark is produced are selected by requesting at least one jet to be associated with a secondary vertex of interaction produced by the decay of B-meson (b-tagging). In the absence of an excess over the Standard Model prediction for the final state considered in this analysis, we compute a 95% Confidence Level upper limit on the techniparticle production cross section for the V{sub T} mass range: 190 GeV/c{sup 2} {le} m(V{sub T} ) {le} 220 GeV/c{sup 2}
Controls on Oceanic Crustal and Upper Mantle Structure by Syn- and Post-Accretion Processes from Multichannel Seismic Data Around and Across the Hawaiian-Emperor Seamount Chain
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National software infrastructure for lattice quantum chromodynamics
Two-neutron transfer reaction mechanisms in C(He,He)C using a realistic three-body He model
The reaction mechanisms of the two-neutron transfer reaction
C(He,He) have been studied at 30 MeV at the TRIUMF ISAC-II
facility using the SHARC charged-particle detector array. Optical potential
parameters have been extracted from the analysis of the elastic scattering
angular distribution. The new potential has been applied to the study of the
transfer angular distribution to the 2 8.32 MeV state in C, using
a realistic 3-body He model and advanced shell model calculations for the
carbon structure, allowing to calculate the relative contributions of the
simultaneous and sequential two-neutron transfer. The reaction model provides a
good description of the 30 MeV data set and shows that the simultaneous process
is the dominant transfer mechanism. Sensitivity tests of optical potential
parameters show that the final results can be considerably affected by the
choice of optical potentials. A reanalysis of data measured previously at 18
MeV however, is not as well described by the same reaction model, suggesting
that one needs to include higher order effects in the reaction mechanism.Comment: 9 pages, 9 figure
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