Recent evidence for pentaquark baryons is critically reviewed in the light of new high statistics data. The search of the WA89 experiment for the Ξ −− (1860) is presented in detail and consequences of its non-observations are discussed. 1 The Myth of Sisyphus Giving these days a talk on pentaquarks or-even worse-writing afterwards a report for the… (More)
We explore the feasibility to study exclusive meson production (EMP) in hard muon-proton scattering µ p → µ p M at the COMPASS experiment. These measurements constrain the off-forward parton distributions (OFPD's) of the proton, which are related to the quark orbital contribution to the proton spin.
Future experiments on hypernuclei γ-spectroscopy at FINUDA@DAFNE and PANDA@FAIR require the operation of germanium detectors in high magnetic fields (B ≈ 1 T). The performance of these detectors in such an environment has not been well investigated. In particular, one might expect three problems to arise: (i) breakdown of FETs in the preamplifiers, (ii)… (More)
The HypHI project aims to study hypernuclei by means of collisions of stable heavy ion and rare-isotope beams on stable target materials [1, 2]. As the first step (Phase 0), the feasibility of precise hypernuclear spectroscopy with heavy ion beams will be demonstrated with 6 Li beam at 2 A GeV impinged on a 12 C target by identifying 3 Λ H, 4 Λ H and 5 Λ He… (More)
theta(degree) 0 20 40 60 80 100 120 140 160 180 0 200 400 600 800 1000 1200 protons kaons pions neutrons Figure 1: Distribution of produced particles from background reactions. The Germanium detectors will be affected mainly by particles emitted at backward axial angle For the high resolution spectroscopy of excited hyper-nuclear states a position sensitive… (More)
The HypHI project which has been recently started aims to study hypernuclei by means of collisions of stable heavy ion and rare-isotope beams on stable target materials [1, 2]. As the first step (Phase 0), the feasibility of hypernuclear spectroscopy with heavy ion beams will be demonstrated with 6 Li beams at 2 A GeV impinged on a 12 C target by… (More)
In order to understand baryon-baryon interactions under flavored SU(3), one must investigate the interaction between nucleons and hyperons, which can be accessed so far mainly by studying hypernuclei. Since hyperons are expected to be one of the main ingredients of neutron dense matter such as neutron stars, understanding the interaction including hyperons… (More)
Inclusive cross sections for ? hyperon production in high-energy ? , ? and neutron induced interactions were measured by the experiment WA89 at CERN. Secondary ? and ? beams with average momenta of 345 GeV=c and a neutron beam of average momentum 65 GeV=c were produced by primary protons of 450 GeV=c from the CERN SPS. Both single and double diierential… (More)
The caloric curve of the highly excited projectile spectators emerging from peripheral collisions of two Au-nuclei at 600 AMeV was determined by measuring fragments and neutrons of its decay. This analysis will be reviewed and preliminary results obtained from the decay also of the target spectator will be presented.
Double hypernuclei will be produced at PANDA via a two–steps mechanism[1, 2]. Therefore, spectroscopic information on double hypernuclei will only be obtained via their decay products. Except for the case of very light hy-pernuclei also neutral particles are emitted unfortunately. Therefore, a unique identification of the double hypernu-clei can only be… (More)