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We clarify the taxonomy and nomenclature of several species-group names and the family-group name for the anticheirine scarabs (Scarabaeidae: Rutelinae: Rutelini), a group that includes nearly 550 species and subspecies in 44 genera and subgenera. These clarifications are necessary due to taxonomic and nomenclatural inaccuracies in recent revisionary works. We provide a list of genera included in the anticheirine scarabs sensu Soula. Numerous nomenclatural changes are necessary due to invalid type designations or misspellings: the valid type species of Aequatoria Arrow is Chlorota associata Waterhouse; the valid type species of Chlorota Burmeister is Rutela terminata Le Peletier de Saint-Fargeau and Audinet-Serville; the valid type species of Dorysthetus Blanchard is Macraspis chlorophana Burmeister; the valid type species of Anticheira Eschscholtz is Scarabaeus virens Drury. Changes to the type species of Anticheira result in new combinations: Anticheira virens virens (Drury), new combination, Anticheira virens bleuzeni (Soula), new combination and Anticheira virens jossi (Soula), new combination. Some anticheirine species names were not associated with species descriptions or type designations, making these names nomina nuda and unavailable: “Chlorota smithi”, “Macraspis cincta guatemalensis”, “Parachlorota equatoriana”, “Parachlorota pardoi”, “Pseudothyridium (Megathyridium) bousqueti”, “Theuremaripa rivae brasiliensis” and “Thyridium cupriventre blanchardi”. Dorysthaetus rufipennis Dejean is a nomen nudum and an unavailable name. We correct numerous misspellings from Soula’s five volumes on anticheirine scarabs and provide a list to avoid propagation of these errors by future researchers. Eighteen names are unavailable infrasubspecific names, and thirty-six of Soula’s names were misspelled. These names confuse and obscure ruteline systematics. Lastly, we provide a comprehensive list of infrasubspecific names in the anticheirine scarabs and we establish these as available or unavailable names.
We report results on the ratio of midrapidity antiproton-to-proton yields in Au+Au collisions at sqrt[sNN] = 130 GeV per nucleon pair as measured by the STAR experiment at RHIC. Within the rapidity and transverse momentum range of | y|<0.5 and 0.4<pt<1.0 GeV/c, the ratio is essentially independent of either transverse momentum or rapidity, with an average of 0.65±0.01(stat)±0.07(syst) for minimum bias collisions. Within errors, no strong centrality dependence is observed. The results indicate that at this RHIC energy, although the p-p-bar pair production becomes important at midrapidity, a significant excess of baryons over antibaryons is still present.
The first measurements of light antinucleus production in Au+Au collisions at the Relativistic Heavy-Ion Collider are reported. The observed production rates for d-bar and 3He-bar are much larger than in lower energy nucleus-nucleus collisions. A coalescence model analysis of the yields indicates that there is little or no increase in the antinucleon freeze-out volume compared to collisions at CERN SPS energy. These analyses also indicate that the 3He-bar freeze-out volume is smaller than the d-bar freeze-out volume.
We present the first measurement of midrapidity vector meson phi production in Au+Au collisions at RHIC (sqrt[sNN]=130 GeV) from the STAR detector. For the 11% highest multiplicity collisions, the slope parameter from an exponential fit to the transverse mass distribution is T=379±50(stat)±45(syst) MeV, the yield dN/dy=5.73±0.37(stat)±0.69(syst) per event, and the ratio N phi /Nh- is found to be 0.021±0.001(stat)±0.004(syst). The measured ratio N phi /Nh- and T for the phi meson at midrapidity do not change for the selected multiplicity bins.
We report the first measurement of inclusive antiproton production at midrapidity in Au+Au collisions at sqrt[sNN] = 130 GeV by the STAR experiment at RHIC. The antiproton transverse mass distributions in the measured transverse momentum range of 0.25<pperp<0.95 GeV/c are found to fall less steeply for more central collisions. The extrapolated antiproton rapidity density is found to scale approximately with the negative hadron multiplicity density.
The STAR Collaboration reports the first observation of exclusive rho 0 photoproduction, AuAu-->AuAu rho 0, and rho 0 production accompanied by mutual nuclear Coulomb excitation, AuAu-->Au [star] Au [star] rho 0, in ultraperipheral heavy-ion collisions. The rho 0 have low transverse momenta, consistent with coherent coupling to both nuclei. The cross sections at sqrt[sNN]=130 GeV agree with theoretical predictions treating rho 0 production and Coulomb excitation as independent processes.
The minimum-bias multiplicity distribution and the transverse momentum and pseudorapidity distributions for central collisions have been measured for negative hadrons ( h-) in Au+Au interactions at sqrt[sNN] = 130 GeV. The multiplicity density at midrapidity for the 5% most central interactions is dNh-/d eta | eta = 0 = 280±1(stat)±20(syst), an increase per participant of 38% relative to pp-bar collisions at the same energy. The mean transverse momentum is 0.508±0.012 GeV/c and is larger than in central Pb+Pb collisions at lower energies. The scaling of the h- yield per participant is a strong function of pperp. The pseudorapidity distribution is almost constant within | eta |<1.
We report first results on elliptic flow of identified particles at midrapidity in Au+Au collisions at sqrt[sNN] = 130 GeV using the STAR TPC at RHIC. The elliptic flow as a function of transverse momentum and centrality differs significantly for particles of different masses. This dependence can be accounted for in hydrodynamic models, indicating that the system created shows a behavior consistent with collective hydrodynamical flow. The fit to the data with a simple model gives information on the temperature and flow velocities at freeze-out.
Two-pion correlation functions in Au+Au collisions at sqrt[sNN] = 130 GeV have been measured by the STAR (solenoidal tracker at RHIC) detector. The source size extracted by fitting the correlations grows with event multiplicity and decreases with transverse momentum. Anomalously large sizes or emission durations, which have been suggested as signals of quark-gluon plasma formation and rehadronization, are not observed. The Hanbury Brown-Twiss parameters display a weak energy dependence over a broad range in sqrt[sNN].