Study of intermediate velocity products in the Ar+Ni collisions between 52 and 95 A.MeV

Intermediate velocity products in Ar+Ni collisions from 52 to 95 A.MeV are studied in an experiment performed at the GANIL facility with the 4$\pi$ multidetector INDRA. It is shown that these emissions cannot be explained by statistical decays of the quasi-projectile and the quasi-target in complete equilibrium. Three methods are used to isolate and characterize intermediate velocity products. The total mass of these products increases with the violence of the collision and reaches a large fraction of the system mass in mid-central collisions. This mass is found independent of the incident energy, but strongly dependent on the geometry of the collision. Finally it is shown that the kinematical characteristics of intermediate velocity products are weakly dependent on the experimental impact parameter, but strongly dependent on the incident energy. The observed trends are consistent with a participant-spectator like scenario or with neck emissions and/or break-up.Comment: 37 pages, 13 figure

Search for Darkonium in e+e- Collisions

Collider searches for dark sectors, new particles interacting only feebly with ordinary matter, have largely focused on identifying signatures of new mediators, leaving much of dark sector structures unexplored. In particular, the existence of dark matter bound states (darkonia) remains to be investigated. This possibility could arise in a simple model in which a dark photon (A0 ) is light enough to generate an attractive force between dark fermions. We report herein a search for a JPC ¼ 1−− darkonium state, the ϒD, produced in the reaction eþe− → γϒD, ϒD → A0 A0 A0 , where the dark photons subsequently decay into pairs of leptons or pions, using 514 fb−1 of data collected with the BABAR detector. No significant signal is observed, and we set bounds on the γ − A0 kinetic mixing as a function of the dark sector coupling constant for 0.001 < mA0 < 3.16 GeV and 0.05 < mϒD < 9.5 GeV.publishedVersio

Observation of the baryonic decay B \uaf 0 \u2192 \u39bc+ p \uaf K-K+

We report the observation of the baryonic decay B\uaf0\u2192\u39bc+p\uafK-K+ using a data sample of 471 7106 BB\uaf pairs produced in e+e- annihilations at s=10.58GeV. This data sample was recorded with the BABAR detector at the PEP-II storage ring at SLAC. We find B(B\uaf0\u2192\u39bc+p\uafK-K+)=(2.5\ub10.4(stat)\ub10.2(syst)\ub10.6B(\u39bc+)) 710-5, where the uncertainties are statistical, systematic, and due to the uncertainty of the \u39bc+\u2192pK-\u3c0+ branching fraction, respectively. The result has a significance corresponding to 5.0 standard deviations, including all uncertainties. For the resonant decay B\uaf0\u2192\u39bc+p\uaf\u3c6, we determine the upper limit B(B\uaf0\u2192\u39bc+p\uaf\u3c6)<1.2 710-5 at 90% confidence level

Zwey auserlesene, hochnutzliche Bücher von Vergebung der Sünden durch das Blut unsers Herren Iesu Christi, wider den bäpstlichen Ablas

erstlichen in frantzösischer Sprach under dem Titel Das Römisch Evangelion etc. [von J.L. de Beau-Lieu] beschrieben und aussgangen, jetzund aber allen reformierten evangelischen Christen löblicher Teutscher Nation und anderer Sprachen Unerfarnen zu gutem aufs treuwlichste verdolmetscht durch Caspar Wasern, Diener der Kirchen zu ZürychBogensignaturen: )( - )( )(⁸, )( )( )(⁶, A-Z, a-n⁸, o

L’Institut méditerranéen d’Ecologie et Paléoécologie et son apport à la connaissance des forêts méditerranéennes

International audienc

Forêt méditerranéenne et changement climatique : le regard du passé

International audienceL'évolution du climat n'est pas chose nouvelle, s'affole-t-on pour rien ? C'est à cette question que Jacques-Louis de Beaulieu a répondu lors de la table ronde de notre Colloque de Marseille. Dans cet article, il propose une vision rétrospective des changements observés dans la région méditerranéenne. Pour le XXIe siècle, même s'il existe une part d'incertitude, les scénarios climatiques restent pessimistes