Correlations of Heavy Quarks Produced at Large Hadron Collider

We study the correlations of heavy quarks produced in relativistic heavy ion collisions and find them to be quite sensitive to the effects of the medium and the production mechanisms. In order to put this on a quantitative footing, as a first step, we analyze the azimuthal, transverse momentum, and rapidity correlations of heavy quark-anti quark ($Q\overline{Q}$) pairs in $pp$ collisions at $\cal{O}$($\alpha_{s}^{3}$). This sets the stage for the identification and study of medium modification of similar correlations in relativistic collision of heavy nuclei at the Large Hadron Collider. Next we study the additional production of charm quarks in heavy ion collisions due to multiple scatterings, {\it viz.}, jet-jet collisions, jet-thermal collisions, and thermal interactions. We find that these give rise to azimuthal correlations which are quite different from those arising from prompt initial production at leading order and at next to leading order.Comment: 26 pages, 15 figures. Three new figures added, comparison to experimental data included, abstract and discussion expande

Longitudinal muon spin relaxation in high purity aluminum and silver

The time dependence of muon spin relaxation has been measured in high purity aluminum and silver samples in a longitudinal 2 T magnetic field at room temperature, using time-differential \musr. For times greater than 10 ns, the shape fits well to a single exponential with relaxation rates of \lambda_{\textrm{Al}} = 1.3 \pm 0.2\,(\textrm{stat.}) \pm 0.3\,(\textrm{syst.})\,\pms and \lambda_{\textrm{Ag}} = 1.0 \pm 0.2\,(\textrm{stat.}) \pm 0.2\,(\textrm{syst.})\,\pms

Extraktionskonzept bei multiplen vorzeitigen Milchzahnverlusten und horizontaler Verlagerung eines Eckzahnes

Eine 9-jährige Patientin stellte sich mit multiplen Stützzoneneinbrüchen durch kariesbedingte vorzeitige Milchzahnverluste, einem vollretinierten, horizontal verlagerten Zahn 33, Mittellinienverschiebung sowie einem Unterkieferengstand zur kieferorthopädischen Beratung vor. Initial wurde im Ober- und Unterkiefer durch das Tragen aktiver Platten ein Fortschreiten der Stützzoneneinbrüche verhindert, Milchzahnextraktionen durchgeführt und auf den verzögerten Durchbruch der Prämolaren gewartet. Im Alter von 10 Jahren wurden die Zähne 14, 24 und 44 extrahiert, sowie die operative Entfernung des verlagerten Zahnes 33 durchgeführt. In einer knapp 2-jährigen Multibracket-Therapie wurden die Zähne 44, 45, 46 mesialisiert und Zahn 44 an Eckzahnposition im 4. Quadranten eingestellt. Die verbleibenden Extraktionslücken wurden geschlossen und die Oberkiefermitte eingestellt

Abstracts of contributed papers. Sixth international conference on high- energy physics and nuclear structure, Santa Fe and Los Alamos, NM, June 9--14, 1975

Abstracts of contributed papers are assembled under the following headings (number denotes the number of abstracts in the section): pi p and pi d interactions (10); $pi$ nucleus theory (33); intermediate isobar calculations (8); $pi$-nucleus interactions (25); stopping muons (44); exotic atoms and condensed nuclear states (28); nucleus-nucleus interactions (31); nuclear structure and hypernuclei (7); nucleon-nucleon interactions (24); e- and $gamma$- nucleus interactions (29); weak interactions (17); high energy collisions (13); heavy ions (22); instrumentation (8). (SDF

The time-dependent expression of keratins 5 and 13 during the reepithelialization of human skin wounds

The time-dependent reepithelialization of 55 human surgical skin wounds with a wound age between 8h and more than 2 months was investigated by the immunohistochemical localization of cytokeratins 5 and 13. A complete, rebuilt epidermal layer over the wound area was first detectable in a 5-day-old wound, while all wounds of more than 18 days duration contained a completely reepithelialized wound area. Between 5 and 18 days the basal layer of keratinocytes showed — in contrast to normal skin — only some cells positive for cytokeratin 5. In some, but not all lesions with a wound age of 13 days or more, a basal cell layer completely staining for cytokeratin 5 was demonstrable. This staining pattern was found in all skin wounds with a wound age of more than 23 days. The immunohistochemical detection of cytokeratin 13 which can be observed regularly in non-cornifying squamous epithelia provides no information for the time-estimation of human skin wounds, since no significant temporary expression of this polypeptide seems to occur during the healing of human skin wounds

Report from the hyperon physics subgroup

A number of topics were considered in the Hyperon Group. As the time was reasonably short, and the group was not large, the list of topics is by no means exhaustive. The topics discussed should rather be considered a sampling of a much more extensive list of topics that might have been discussed. This report will thus consist of some brief remarks relevant to the topics discussed, and a few concluding remarks. The interested reader is referred to the reference for appropriate details.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87609/2/160_1.pd