432 research outputs found
Recommended from our members
A revision of the genus Notiphila Fallén (Diptera:Ephydridae) from America north of Mexico
The North American species of the shore fly genus Notiphila Fallen were taxonomically revised. Over 13,000 specimens were examined from throughout the Nearctic Region and information relating to the biology of many species occurring in the West was gathered from both field and laboratory studies. Previously used characters were reevaluated; new evidence from comparative morphological studies on the male and female postabdomens, from developmental stages, and from biological and ecological observations was collected. Forty-nine characters were selected, quantified, and analyzed using standard numerical taxonomic procedures. Collectively, all these data were assessed and a classification derived. Forty-seven Notiphila species are now recognized from North America. These have been further classified into two subgenera and six species-groups. The subgenera were first erected by E. T. Cresson, Jr. and have been substantiated by the additional evidence accumulated during this study. Likewise, the species-groups are essentially those of Cresson with additions and minor modifications. Recognition of the subgenus Notiphila is supported by the external morphology of both sexes, by the morphology of the pupae and larvae, and by phenetic analysis using quantitative procedures. This subgenus includes 25 North American species of which three species are resurrected from synonomy (N. bicolor Cresson, N. cognata Cresson, and N. unicolor), two new names are proposed N. cressoni and N. paludicola for N. bicolor and N. unicolor respectively), and 13 new species are described (N. adusta, N. footei, N. pallicornis, N. taenia, N. phaeopsis, N. pulcra, N. robusta, N. eleomyia, N. latigena, N. orienta, N. pauroura, N. poliosoma, and N. shewelli). These species have been arranged into three species-groups that are based primarily on characters of the male genitalia. Most of the species of this subgenus occur in eastern North America. The second subgenus, Agrolimna, comprises 22 species, including seven new species (N. scoliochaeta, N. atrata, N. deonieri, N. deserta, N. elophila, N. nanosoma, and N. paludia). In addition/ the following synonymies are proposed (older name first: N. decoris Williston = N. atrisetis Cresson, N. quadrisetosa Thomson = N. occidentalis Cresson, and N. pulchrifrons Loew = N. signata Cresson). N. transversa Walker, listed as an Agrolimna species in the latest North American catalog, is a species of the genus Dichaeta. Three species-groups are recognized for the North American species, and most species are distributed in western North America
http://zoobank.org/urn:lsid:zoobank.org:pub:4DFE4D2F-22B6-45CE-9A21-AB4A43FC7B6F
www.mapress.com/zootaxa
A review of Diphuia (Diptera: Ephydridae) with description of two new species from southern Brazil
Measurement of the Forward-Backward Asymmetry in the B -> K(*) mu+ mu- Decay and First Observation of the Bs -> phi mu+ mu- Decay
We reconstruct the rare decays , , and in a data sample
corresponding to collected in collisions at
by the CDF II detector at the Fermilab Tevatron
Collider. Using and decays we report the branching ratios. In addition, we report
the measurement of the differential branching ratio and the muon
forward-backward asymmetry in the and decay modes, and the
longitudinal polarization in the decay mode with respect to the squared
dimuon mass. These are consistent with the theoretical prediction from the
standard model, and most recent determinations from other experiments and of
comparable accuracy. We also report the first observation of the {\mathcal{B}}(B^0_s \to
\phi\mu^+\mu^-) = [1.44 \pm 0.33 \pm 0.46] \times 10^{-6}27 \pm 6B^0_s$ decay observed.Comment: 7 pages, 2 figures, 3 tables. Submitted to Phys. Rev. Let
Search for the standard model Higgs boson decaying to a pair in events with no charged leptons and large missing transverse energy using the full CDF data set
We report on a search for the standard model Higgs boson produced in
association with a vector boson in the full data set of proton-antiproton
collisions at TeV recorded by the CDF II detector at the
Tevatron, corresponding to an integrated luminosity of 9.45 fb. We
consider events having no identified charged lepton, a transverse energy
imbalance, and two or three jets, of which at least one is consistent with
originating from the decay of a quark. We place 95% credibility level upper
limits on the production cross section times standard model branching fraction
for several mass hypotheses between 90 and . For a Higgs
boson mass of , the observed (expected) limit is 6.7
(3.6) times the standard model prediction.Comment: Accepted by Phys. Rev. Let
Search for a New Heavy Gauge Boson Wprime with Electron + missing ET Event Signature in ppbar collisions at sqrt(s)=1.96 TeV
We present a search for a new heavy charged vector boson decaying
to an electron-neutrino pair in collisions at a center-of-mass
energy of 1.96\unit{TeV}. The data were collected with the CDF II detector
and correspond to an integrated luminosity of 5.3\unit{fb}^{-1}. No
significant excess above the standard model expectation is observed and we set
upper limits on . Assuming standard
model couplings to fermions and the neutrino from the boson decay to
be light, we exclude a boson with mass less than
1.12\unit{TeV/}c^2 at the 95\unit{%} confidence level.Comment: 7 pages, 2 figures Submitted to PR
Search for the standard model Higgs boson decaying to a bb pair in events with one charged lepton and large missing transverse energy using the full CDF data set
We present a search for the standard model Higgs boson produced in
association with a W boson in sqrt(s) = 1.96 TeV p-pbar collision data
collected with the CDF II detector at the Tevatron corresponding to an
integrated luminosity of 9.45 fb-1. In events consistent with the decay of the
Higgs boson to a bottom-quark pair and the W boson to an electron or muon and a
neutrino, we set 95% credibility level upper limits on the WH production cross
section times the H->bb branching ratio as a function of Higgs boson mass. At a
Higgs boson mass of 125 GeV/c2 we observe (expect) a limit of 4.9 (2.8) times
the standard model value.Comment: Submitted to Phys. Rev. Lett (v2 contains clarifications suggested by
PRL
Search for the standard model Higgs boson decaying to a bb pair in events with two oppositely-charged leptons using the full CDF data set
We present a search for the standard model Higgs boson produced in
association with a Z boson in data collected with the CDF II detector at the
Tevatron, corresponding to an integrated luminosity of 9.45/fb. In events
consistent with the decay of the Higgs boson to a bottom-quark pair and the Z
boson to electron or muon pairs, we set 95% credibility level upper limits on
the ZH production cross section times the H -> bb branching ratio as a function
of Higgs boson mass. At a Higgs boson mass of 125 GeV/c^2 we observe (expect) a
limit of 7.1 (3.9) times the standard model value.Comment: To be submitted to Phys. Rev. Let
- …