Coronary Artery Aneurysm Rupture in a Patient With Polyarteritis Nodosa.

We present the case of a 42-year-old male patient with ST-segment elevation myocardial infarction and pericardial effusion due to rupture of the left anterior descending artery most likely secondary to polyarteritis nodosa. Successful surgery was performed under cardiopulmonary bypass using antegrade and retrograde cardioplegia combined. ().

Clustering of Four-Component Unitary Fermions.

Ab initio nuclear physics tackles the problem of strongly interacting four-component fermions. The same setting could foreseeably be probed experimentally in ultracold atomic systems, where two- and three-component experiments have led to major breakthroughs in recent years. Both due to the problem's inherent interest and as a pathway to nuclear physics, in this Letter we study four-component fermions at unitarity via the use of quantum Monte Carlo methods.

Baryon-Number Violation by Two Units and the Deuteron Lifetime.

We calculate the lifetime of the deuteron with dimension-nine quark operators that violate baryon number by two units. We construct an effective field theory for |ΔB|=2 interactions that give rise to neutron-antineutron (n-n[over ¯]) oscillations and dinucleon decay within a consistent power counting. We calculate the ratio of the deuteron lifetime to the square of the n-n[over ¯] oscillation time up to next-to-leading order.

Four-Body Scale in Universal Few-Boson Systems.

The role of an intrinsic four-body scale in universal few-boson systems is the subject of active debate. We study these systems within the framework of effective field theory. For systems of up to six bosons we establish that no four-body scale appears at leading order (LO).

New Leading Contribution to Neutrinoless Double-β Decay.

Within the framework of chiral effective field theory, we discuss the leading contributions to the neutrinoless double-beta decay transition operator induced by light Majorana neutrinos. Based on renormalization arguments in both dimensional regularization with minimal subtraction and a coordinate-space cutoff scheme, we show the need to introduce a leading-order short-range operator, missing in all current calculations. We discuss strategies to determine the finite part of the short-range coupling by matching to lattice QCD or by relating it via chiral symmetry to isospin-breaking observables in the two-nucleon sector.