HPD: new UV detector for Imaging Air Cherenkov Telescopes
AbstractWeproposetouseanewlargephotocathodicareaUVRb 2 TeHPDdevelopedatCERN(TOMcollaboration)asadetectorwellsuitedforIACTexperiments.SomeaspectsofUVatmospherictransmissionarepresented.r 2003ElsevierScienceB.V.Allrightsreserved.  IACT;UVCherenkovlight;HPD 1. IntroductionCLUE[1]isanImagingAtmosphericCheren-kovTelescope(IACT)array(9telescopes)locatedatLaPalmaIsland(2.2kmasl).TheobservationoftheUVCherenkovlightoftheatmosphericshowersproducedbyVHE(10GeV–l0TeV)cos-mic-andg-rays,allowsIACTexperimentstohavelongduty-cycle,totakemeasurementinbrightlyskyzones(likeMilkyWayCenter)andtopointdirectlytothemoon.CLUE[2]hasdetectedtheclassA(T.Weekescatalog)extragalacticVHEsourceAGNMkn421at17s signiﬁcancelevel,using a Multi Wire Proportional Chamber(MWPC)intherange190–220nmasUVdetector.ThelightyieldbyVHEatmosphericshowersissuppressedbytheozonelayersothatthenumberofsignalphotonsonthemirrorfocalplaneisrelatively low (C80ph/m 2 @2.2kmasl). We areinvestigatingthepossibilitytouseanewlargephotocathodicareaUVRb

title: Measurement of the single-top-quark production cross section at CDF.
abstract: We report a measurement of the single-top-quark production cross section in 2.2 fb;{-1} of pp collision data collected by the Collider Detector at Fermilab at sqrt[s]=1.96 TeV. Candidate events are classified as signal-like by three parallel analyses which use likelihood, matrix element, and neural network discriminants. These results are combined in order to improve the sensitivity. We observe a signal consistent with the standard model prediction, but inconsistent with the background-only model by 3.7 standard deviations with a median expected sensitivity of 4.9 standard deviations. We measure a cross section of 2.2(-0.6)(+0.7)(stat+syst) pb, extract the Cabibbo-Kobayashi-Maskawa matrix-element value |V(tb)|=0.88(-0.12)(+0.13)(stat+syst)+/-0.07(theory), and set the limit |V(tb)|>0.66 at the 95% C.L.

title: Observation of exclusive electron-positron production in hadron-hadron collisions.
abstract: We present the first observation of exclusive e(+)e(-) production in hadron-hadron collisions, using pp[over] collision data at (square root) s = 1.96 TeV taken by the run II Collider Detector at Fermilab, and corresponding to an integrated luminosity of 532 pb(-1). We require the absence of any particle signatures in the detector except for an electron and a positron candidate, each with transverse energy E(T) > 5 GeV and pseudorapidity |eta| < 2. With these criteria, 16 events are observed compared to a background expectation of 1.9+/-0.3 events. These events are consistent in cross section and properties with the QED process pp[over] --> p + e(+)e(-) + p[over] through two-photon exchange. The measured cross section is 1.6(-0.3)(+0.5)(stat) +/- 0.3(syst) pb. This agrees with the theoretical prediction of 1.71+/-0.01 pb.

title: Improved determination of the sample composition of dimuon events produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
abstract: We use a new method to estimate with 5% accuracy the contribution of pion and kaon in-flight-decays to the dimuon data set acquired with the CDF detector. Based on this improved estimate, we show that the total number and the properties of the collected dimuon events are not yet accounted for by ordinary sources of dimuons which also include the contributions, as measured in the data, of heavy flavor, ϒ, and Drell–Yan production in addition to muons mimicked by hadronic punchthrough. The number of unaccounted events corresponds to (12.8±3.2)% of the $b\bar{b}$ production. We find that (23±6)% of the unaccounted events contain additional muon candidates. For comparison, this fraction is (6.9±0.4)% for events due to $b\bar{b}$ production.

title: ILC Reference Design Report: ILC Global Design Effort and World Wide Study

title: Model-independent and quasi-model-independent search for new physics at CDF
abstract: Data collected in run II of the Fermilab Tevatron are searched for indications of new electroweak scale physics. Rather than focusing on particular new physics scenarios, CDF data are analyzed for discrepancies with respect to the standard model prediction. A model-independent approach (Vista) considers the gross features of the data and is sensitive to new large cross section physics. A quasi-model-independent approach (Sleuth) searches for a significant excess of events with large summed transverse momentum and is particularly sensitive to new electroweak scale physics that appears predominantly in one final state. This global search for new physics in over 300 exclusive final states in 927pb-1 of pp collisions at s=1.96TeV reveals no such significant indication of physics beyond the standard model.

title: Study of hadronic final states at LEP
abstract: Recent analyses, performed using multihadronic Z 0 decays collected with the OPAL detector between 1991 and 2000 at the Large Electron Positron (LEP) collider, are presented. The first one is a study of correlations of particles with restricted momenta, indicating some difficulties with the Local Parton-Hadron Duality (LPHD) hypothesis when applied to many-particle inclusive observables of soft hadrons. In the second analysis, unbiased gluon jet properties are studied using a new technique called jet boost algorithm.