New southern geographical records of intertidal sea urchins (Echinodermata: Echinoidea), with notes on abundance

Ten species of epifaunal sea urchin were identified at Preslies Bay, Transkei, establishing new southern geographical distributions for seven of the species. Local distributions intertidally, subtidally, and within the Mtakatye estuary were documented. Estimates of abundance on the intertidal rocky shore indicated vertical separation between certain species

Book Reviews

Book Review 1Book Title: Pheromones of Social BeesBook Author: John B. FreeChapman & Hall, 1987. 218 pp.Book Review 2Book Title: Insects - PlantsBook Authors: V. Labeyrie et alDr. W. Junk Publishers, The Hague, 1987. 459 pp.Book Review 3Book Title: The Ecology of Woodland Rodents: Bank voles and wood miceBook Authors: Edited by J.R. Flowerdew, J. Gurnell & J.H.W GippsThe Zoological Society of London. Clarendon Press, Oxford, 1985. 418 pp.Book Review 4Book Title: Visual behavior in salamandersBook Author: Gerhard RothSpringer-Verlag, Berlin, 1987. 301 pp.Book Review 5Book Title: Digestive Physiology and Nutrition of MarsupialsBook Author: Ian D. HumeMonographs on Marsupial Biology. Cambridge University Press, 1982. 256 pp.Book Review 6Book Title: Neurobiology and Behavior of HoneybeesBook Authors: Edited by Randolf Menzel & Alison MercerSpringer-Verlag, 1987.334 pp.Book Review 7Book Title: Ecology and Productivity of an African Wetland SystemBook Author: G.A. EllenbroekDr W. Junk Publishers, Dordrecht, 1987. 267 pagesBook Review 8Book Title: Biological Surveys of Estuaries and Coasts Estuarine and Brackish Water Sciences Association HandbookBook Authors: Edited by J.M. Baker & W.J. WolffCambridge University Press, 1987. 449 pp.Book Review 9Book Title: Caste Differentiation in Social InsectsBook Authors: Edited by J.A.L. Watson, S.M. Okot-Kotber & C.H. NoirotPergamon Press, Oxford, 1985. 399 pp.Book Review 10Book Title: Sistematica, filogenia y biogeografia de la subfamilia Gibbiinae (Coleoptera, Ptinidae)Book Author: Xavier BellésTreballs del Museu de Zoologia, 1985, No.3, Barcelona. 94 pp.Book Review 11Book Title: A Biologist's Advanced MathematicsBook Author: D.R. CaustonAllen & Unwin, London 326 pp.Book Review 12 Book Title: Reproduction in Mammals: 5 Manipulating reproductionBook Authors: Edited by C.R. Austin & R.V. ShortCambridge University Press, London, New York, New Rochelle, Melbourne, Sydney. 235 pp.Book Review 13Book Title: Vertebrate Fetal MembranesBook Author: Harland W. MossmanMacmillan press, 1987. 383 pp.Book Review 14Book Title: Avian Physiology (Fourth edition)Book Author: Edited by P.O. SturkieSpringer-Verlag, New York, 1986. 516 pp

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment

This paper describes an analysis of the angular distribution of W->enu and W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and the missing transverse energy, the W decay angular distribution projected onto the transverse plane is obtained and analysed in terms of helicity fractions f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw > 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour, are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017 +/- 0.030, where the first uncertainties are statistical, and the second include all systematic effects.Comment: 19 pages plus author list (34 pages total), 9 figures, 11 tables, revised author list, matches European Journal of Physics C versio

Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS

The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.530+/-0.005 (stat.)+/-0.009 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.Comment: 5 pages plus author list (18 pages total), 2 figures, 1 table, corrected author list, matches final version in Physical Review Letter

Search for displaced vertices arising from decays of new heavy particles in 7 TeV pp collisions at ATLAS

We present the results of a search for new, heavy particles that decay at a significant distance from their production point into a final state containing charged hadrons in association with a high-momentum muon. The search is conducted in a pp-collision data sample with a center-of-mass energy of 7 TeV and an integrated luminosity of 33 pb^-1 collected in 2010 by the ATLAS detector operating at the Large Hadron Collider. Production of such particles is expected in various scenarios of physics beyond the standard model. We observe no signal and place limits on the production cross-section of supersymmetric particles in an R-parity-violating scenario as a function of the neutralino lifetime. Limits are presented for different squark and neutralino masses, enabling extension of the limits to a variety of other models.Comment: 8 pages plus author list (20 pages total), 8 figures, 1 table, final version to appear in Physics Letters

Measurement of the inclusive isolated prompt photon cross-section in pp collisions at sqrt(s)= 7 TeV using 35 pb-1 of ATLAS data

A measurement of the differential cross-section for the inclusive production of isolated prompt photons in pp collisions at a center-of-mass energy sqrt(s) = 7 TeV is presented. The measurement covers the pseudorapidity ranges |eta|<1.37 and 1.52<=|eta|<2.37 in the transverse energy range 45<=E_T<400GeV. The results are based on an integrated luminosity of 35 pb-1, collected with the ATLAS detector at the LHC. The yields of the signal photons are measured using a data-driven technique, based on the observed distribution of the hadronic energy in a narrow cone around the photon candidate and the photon selection criteria. The results are compared with next-to-leading order perturbative QCD calculations and found to be in good agreement over four orders of magnitude in cross-section.Comment: 7 pages plus author list (18 pages total), 2 figures, 4 tables, final version published in Physics Letters

Reducing heterotic M-theory to five dimensional supergravity on a manifold with boundary

This paper constructs the reduction of heterotic $M$-theory in eleven dimensions to a supergravity model on a manifold with boundary in five dimensions using a Calabi-Yau three-fold. New results are presented for the boundary terms in the action and for the boundary conditions on the bulk fields. Some general features of dualisation on a manifold with boundary are used to explain the origin of some topological terms in the action. The effect of gaugino condensation on the fermion boundary conditions leads to a `twist' in the chirality of the gravitino which can provide an uplifting mechanism in the vacuum energy to cancel the cosmological constant after moduli stabilisation.Comment: 16 pages, RevTe