1.

Ground-state binding energy of [sub][Lambda] [sup]4 H from high-resolution decay-pion spectroscopy

The paper reports on a systematic study on the [Lambda] ground state binding energy of hyperhydrogen [Lambda]4H measured at the Mainz Microtron MAMI. The energy was deduced from the spectroscopy of mono-energetic pions from the two-body decays of hyperfragments, which were produced and stopped in a 9 Be target.

COBISS.SI-ID: 2984804

2.

Electroexcitation of the [Delta][sup]+(1232) at low momentum transfer

We report on new p(e,e′p)π∘ measurements at the Δ+(1232) resonance at the low momentum transfer region, where the mesonic cloud dynamics is predicted to be dominant and rapidly changing, offering a test bed for chiral effective field theory calculations.

COBISS.SI-ID: 2984548

3.

Measurement of the p(e, e' [pi][sup]+)n reaction close to threshold and at low Q[sup]2

The cross section of the p(e,e′π+)n reaction has been measured for five kinematic settings at an invariant mass of W=1094 MeV and for a four-momentum transfer of Q2=0.078 (GeV/c)2 . The measurement has been performed at MAMI using a new short-orbit spectrometer (SOS) of the A1 collaboration and show that we do not yet understand the dynamics of the fundamental pion.

COBISS.SI-ID: 3057764