B Mixing and Lifetimes at the Tevatron

The Tevatron collider at Fermilab provides a very rich environment for the study of b-hadrons. Both the D0 and CDF experiments have collected a sample of about 1 fb^{-1}. We report results on three topics: b-hadron lifetimes, polarization amplitudes and the decay width difference in Bs to Jpsi Phi, and Bs mixing.Comment: Flavor Physics & CP Violation Conference, Vancouver, 200

Anti-DNA antibodies and circulating immune complexes (C1q-IgG) in recurrent aphtous stomatitis

Anti-DNA antibodies and circulating immune complexes (C1q-IgG) in sera from 50 patients with minor aphtae at the moment of study and 50 healthy controls, were determined. The obtained results were correlated with chronological and clinical parameters of the disease. Our findings show a greater number of patients than controls with higher values of anti-DNA antibodies. The time from the last active stage of the disease conditioned the anti-DNA antibody levels (p< 0.001). However, no significant differences among the number of recurrences in a year or the number of lesions in a ulcerative stage and the anti-DNA antibody concentrations were observed.Cette étude a pour but de déterminer les anticorps anti-ADN et les complexes immuns circulants C1q-IgG dans le sérum de 50 patients qui présentaient des aphtes mineurs au moment de l’étude et chez 50 contrôles. Les résultats obtenus sont en rapport avec les paramètres cliniques et chronologiques de la maladie. Nous avons trouvé des niveaux plus élevés d’anticorps anti-ADN chez les patients avec des aphtes mineurs, en comparaison avec les contrôles. Il existait une corrélation entre ces niveaux d’anticorps anti-ADN et le temps écoulé depuis le dernier épisode de la maladie (p<0.001). Il n’existait cependant pas de différences significatives entre les concentrations anti-ADN ni en ce qui concerne le nombre de récidives ni le nombre de lésions durant l’épisode

Search for Anomalous Production of Multilepton Events in pp̅ Collisions at √s=1.96 TeV

We report a search for the anomalous production of events with multiple charged leptons in pp̄ collisions at s=1.96TeV using a data sample corresponding to an integrated luminosity of 346pb-1 collected by the CDFII detector at the Fermilab Tevatron. The search is divided into three-lepton and four-or-more-lepton data samples. We observe six events in the three-lepton sample and zero events in the 4-lepton sample. Both numbers of events are consistent with standard model background expectations. Within the framework of an R-parity-violating supergravity model, the results are interpreted as mass limits on the lightest neutralino (χ 10) and chargino (χ1±) particles. For one particular choice of model parameters, the limits are M(χ10)>110GeV/c2 and M(χ1±)>203GeV/c2 at 95% confidence level; the variation of these mass limits with model parameters is presented. © 2007 The American Physical Society.This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A. P. Sloan Foundation; the Bundesministerium fu¨r Bildung und Forschung, Germany; the Korean Science and Engineering Foundation and the Korean Research Foundation; the Particle Physics and Astronomy Research Council and the Royal Society, UK; the Russian Foundation for Basic Research; the Comisio´n Interministerial de Ciencia y Tecnologı´a, Spain; in part by the European Community’s Human Potential Programme under Contract No. HPRN-CT-2002-00292; and the Academy of Finland.Peer Reviewe