Die solitäre abszedierende Osteomyelitis des Kieferköpfchens: Eine Rarität

Zusammenfassung: Fall: Es wird über den seltenen Fall einer solitären abszedierenden, sekundär chronischen Osteomyelitis des linken Processus condylaris berichtet. Aus dem Abszessmaterial wurde der Keim Haemophilus aphrophilus isoliert. Therapeutisch erfolgte eine Resektion des Processus condylaris mit Sofortrekonstruktion des Kondylus mithilfe einer Kopfendoprothese. Diskussion: Mögliche Ursachen für diese seltene Lokalisation einer sekundär chronischen Osteomyelitis werden anhand der Literatur aufgearbeitet und dem vorliegenden Fall gegenübergestellt. Schlussfolgerung: Als mögliche Ursache wird eine Keiminokulation durch die Nadel bei einer Lokalanästhesie, eine bakterielle Kontamination während der Zahnextraktion oder eine hämatogene Aussaat durch den Extraktionsvorgang angenomme

Die kondyläre Metastasierung: Literaturrecherche und ein Fallbericht

Zusammenfassung: Hintergrund: Kondyläre Metastasen sind eine Rarität. In der Literaturrecherche entsprachen nur 23 der insgesamt 69 gefundenen Fälle den Kriterien von Meyer u. Shklar. Fallbericht: Bei einem 48-jährigen Mann mit Schmerzen im linken Kiefergelenk wurde im linken Kondylus eine solitäre Metastase eines kurz zuvor operierten Lungenkarzinoms gefunden. Aufgrund der ausgedehnten Umgebungsinfiltration erfolgte eine kurative Radiatio. Im Verlauf traten weitere Skelettmetastasen auf. Diskussion: Kieferköpfchenmetastasen unterscheiden sich bezüglich ihres Verlaufs kaum von den Metastasen des extraartikulären Kieferbereiches. Unter den metastasierenden Tumoren rangiert das Mammakarzinom als Primärtumor an erster Stelle, gefolgt vom Lungenkarzinom. Klinisch und radiologisch können keine spezifischen Parameter für eine Diagnosestellung angegeben werden. Bei der Differenzialdiagnostik der Gelenkserkrankungen sollte jedoch insbesondere bei Patienten mit bekannten Primärtumoren und Gelenksbeschwerden sowie radiologischen Auffälligkeiten eine mögliche Metastasierung berücksichtigt werden. Die Diagnose sollte für eine entsprechende Therapieplanung histologisch gesichert werden. Das therapeutische Vorgehen ist in der Regel palliativ, da die Grunderkrankung bei Diagnosestellung einer Kieferköpfchenmetastase zumeist weit fortgeschritten is

High precision measurement of the associated strangeness production in proton proton interactions

A new high precision measurement of the reaction pp -> pK+Lambda at a beam momentum of 2.95 GeV/c with more than 200,000 analyzed events allows a detailed analysis of differential observables and their inter-dependencies. Correlations of the angular distributions with momenta are examined. The invariant mass distributions are compared for different regions in the Dalitz plots. The cusp structure at the N Sigma threshold is described with the Flatt\'e formalism and its variation in the Dalitz plot is analyzed.Comment: accepted for publication in Eur. Phys. J.

Polarization Analysis of p̄ Produced in pA Collisions

A quite simple procedure for the generation of a polarized antiproton beam could be worked out if antiprotons are produced with some polarization. In order to investigate this possibility measurements of the polarization of produced antiprotons have been started at a CERN/PS test beam. The polarization will be determined from the asymmetry of the elastic antiproton scattering at a liquid hydrogen target in the CNI region for which the analyzing power is well known. The data are under analysis and an additional measurement is done in 2018. Details on the experiment and the ongoing data analysis will be given

How to measure the parity of the Θ+\Theta^+ in p⃗p⃗\vec p\vec p collisions

Triggered by a recent paper by Thomas, Hicks and Hosaka, we investigate which observables can be used to determine the parity of the $\Theta^+$ from the reaction $\vec p\vec p \to \Sigma^+\Theta^+$ near its production threshold. In particular, we show that the sign of the spin correlation coefficient $A_{xx}$ for small excess energies yields the negative of the parity of the $\Theta^+$. The argument relies solely on the Pauli principle and parity conservation and is therefore model--independent.Comment: References completed, discussion on possible influence of background added; conclusions unchange

First Model-Independent Measurement of the Spin Triplet pΛp\Lambda Scattering Length from Final State Interaction in the p⃗p→pK+Λ\vec{p}p \rightarrow pK^{+}\Lambda Reaction

The $\vec{p}p \rightarrow pK^{+}\Lambda$ reaction has been measured with the COSY-TOF detector at a beam momentum of $2.7\,\mathrm{GeV}/c$. The polarized proton beam enables the measurement of the beam analyzing power by the asymmetry of the produced kaon ($A_N^{K}$). This observable allows the $p\Lambda$ spin triplet scattering length to be extracted for the first time model independently from the final-state interaction in the reaction. The obtained value is $a_{t} = (-2.55 ^{+0.72}_{-1.39} {}_{\textrm{stat.}} \pm 0.6_{\textrm{syst.}} \pm 0.3_{\textrm{theo.}})\mathrm{fm}$. This value is compatible with theoretical predictions and results from model-dependent analyses.Comment: Revised version as accepted for publication in PR

The barrel DIRC of PANDA

Cooled antiproton beams of unprecedented intensities in the momentum range of 1.5-15 GeV/c will be used for the PANDA experiment at FAIR to perform high precision experiments in the charmed quark sector. The PANDA detector will investigate antiproton annihilations with beams in the momentum range of 1.5 GeV/c to 15 GeV/c on a fixed target. An almost 4π acceptance double spectrometer is divided in a forward spectrometer and a target spectrometer. The charged particle identification in the latter is performed by ring imaging Cherenkov counters employing the DIRC principle

The barrel DIRC of PANDA

Cooled antiproton beams of unprecedented intensities in the momentum range of 1.5-15 GeV/c will be used for the PANDA experiment at FAIR to perform high precision experiments in the charmed quark sector. The PANDA detector will investigate antiproton annihilations with beams in the momentum range of 1.5 GeV/c to 15 GeV/c on a fixed target. An almost 4π acceptance double spectrometer is divided in a forward spectrometer and a target spectrometer. The charged particle identification in the latter is performed by ring imaging Cherenkov counters employing the DIRC principle

Single-Pion Production in pp Collisions at 0.95 GeV/c (II)

The single-pion production reactions $pp\to d\pi^+$, $pp\to np\pi^+$ and $pp\to pp\pi^0$ were measured at a beam momentum of 0.95 GeV/c ($T_p \approx$ 400 MeV) using the short version of the COSY-TOF spectrometer. The central calorimeter provided particle identification, energy determination and neutron detection in addition to time-of-flight and angle measurements from other detector parts. Thus all pion production channels were recorded with 1-4 overconstraints. Main emphasis is put on the presentation and discussion of the $np\pi^+$ channel, since the results on the other channels have already been published previously. The total and differential cross sections obtained are compared to theoretical calculations. In contrast to the $pp\pi^0$ channel we find in the $np\pi^+$ channel a strong influence of the $\Delta$ excitation already at this energy close to threshold. In particular we find a $(3 cos^2\Theta + 1)$ dependence in the pion angular distribution, typical for a pure s-channel $\Delta$ excitation and identical to that observed in the $d\pi^+$ channel. Since the latter is understood by a s-channel resonance in the $^1D_2$ $pn$ partial wave, we discuss an analogous scenario for the $pn\pi^+$ channel

The barrel DIRC of PANDA

Cooled antiproton beams of unprecedented intensities in the momentum range of 1.5-15 GeV/c will be used for the PANDA experiment at FAIR to perform high precision experiments in the charmed quark sector. The PANDA detector will investigate antiproton annihilations with beams in the momentum range of 1.5 GeV/c to 15 GeV/c on a fixed target. An almost 4π acceptance double spectrometer is divided in a forward spectrometer and a target spectrometer. The charged particle identification in the latter is performed by ring imaging Cherenkov counters employing the DIRC principle