Conveners
Hadrons in medium - hyperons and mesons in nuclear matter
- Laura Fabbietti
- William Horowitz (University of Cape Town)
- Hirokazu Tamura (Tohoku University)
Hadrons in medium - hyperons and mesons in nuclear matter
- Hirokazu Tamura (Tohoku University)
- Laura Fabbietti
- William Horowitz (University of Cape Town)
Description
Information for speakers about talk's duration:
25 min slot= 20 to speak + 5 for questions
20 min slot = 17 to speak + 3 for questions
The hypertriton (3ΛH) is the lightest hypernucleus consisting of a proton, a neutron, and a Λ hyperon. From old emulsion experiments, the Λ separation energy of the hypertriton has been measured as 130 ± 50 keV. Theoretical calculation shows that Λ hyperon is separated by ~10 fm from the deuteron inside hypertriton. Therefore, as a very loosely bound system, the lifetime of the hypertriton has...
The femtoscopic studies done by the ALICE Collaboration provided results with unprecedented precision for the short-range strong interactions between different hadron pairs. The next challenge is the development of the three-particle femtoscopy which will deliver the first ever direct measurement of genuine three-body forces. Such results would be a crucial input for the low-energy QCD and...
The $^{3}_{\Lambda}\text{H}$ is a bound state of proton (p), neutron (n) and $\Lambda$. Studying its characteristics provides insights about the strong interaction between the lambda and ordinary nucleons. In particular, the $^{3}_{\Lambda}\text{H}$ is an extremely loosely bound object, with a large wave-function.
As a consequence, the measured (anti-)$^{3}_{\Lambda}\text{H}$ production...
The hypertriton puzzle concerns the connection between lifetime and binding energy of the simplest yet worst understood hypernucleus consisting of one proton, neutron and Lambda.
A new experiment is prepared at the Mainz Microtron facility to determine the hypertriton Lambda binding energy via decay pion spectroscopy, which was successfully pioneered in the recent years. The experiment...
The study of the antikaon nucleon system at very low energies plays a key role for the understanding of the strong interaction between hadrons in the strangeness sector. The information provided by the low energy kaon- nucleon interaction is accessible through the study of kaonic atoms. The lightest atomic systems, namely the kaonic hydrogen and the kaonic deuterium, provide the isospin...
In the course of its full lifetime $\overline{\mbox{P}}$ANDA at FAIR will address the physics of strange baryons with S=-2 in nuclei by several novel and unique measurements. This series of experiments will start with the exclusive production of hyperon-antihyperon pairs close to their production threshold in antiproton-nucleus collisions. This day-one experiment offers a hitherto unexplored...
The attractive nature of $\bar{K}N$ interaction has stimulated theoretical and experimental searches for $K^-$ bound states in different systems. In particular, many theoretical calculations devoted to the lightest possible system $\bar{K}NN$ have been performed using different methods: Faddeev equations with coupled channels, variational methods, and some others, see a review [1] and...
The electromagnetic structure of baryons is modified in the nuclear medium.
The modifications can be inferred from the comparison between the electromagnetic form factors in medium with the respective form factor in vacuum.
Of particular interest is the ratio between the electric and magnetic form factors in medium ($G_E^*/G_M^*$) and vacuum ($G_E/G_M$) of octet baryons.
The deviation of...
The relative production rate of (multi-)strange hadrons in high-multiplicity hadronic interactions is enhanced with respect to the one measured at lower multiplicities and reaches values observed in heavy-ion collisions. The microscopic origin of this striking phenomenon, originally interpreted as a signature of Quark-Gluon Plasma (QGP) formation, is still unknown: is it related to soft...
The High Acceptance DiElectron Spectrometer (HADES) is a fixed target experiment which explores the properties of hadronic matter in collisions of pions, protons and nuclei at beam energies 1-2 AGeV. It operates at the SIS18 accelerator in GSI, Darmstadt.
The precise measurements of neutral mesons yield were already carried out by TAPS collaboration. However, their measurements have only one...
Knowledge of whether the proton's electromagnetic (EM) structure changes when it is bound inside an atomic nucleus is important for a better understanding of nuclear matter and its behavior. If such change is present it is expected to be relatively small and therefore difficult to experimentally determine.
The ratio of the transverse to longitudinal polarization-transfer components in the...
Hypernuclear studies have played an important role to understand hyperon-nucleon fundamental interaction properties and also to disclose characteristic structures of many-nucleon systems with strange particles which are free from the nucleon Pauli principle. In various theoretical approaches in hypernuclear spectroscopy, different types of production cross sections are often compared in order...
Hypernuclei with proton or neutron excess are of particular interest in strangeness nuclear physics [1]. Such systems are loosely studied experimentally so far. The first attempts to get neutron-rich Λ hypernuclei [2-4] were taken using mesonic projectiles. Exotic hypernuclei can be produced also in heavy ion collisions [5], particularly, at NICA complex developed at JINR. Properties of...
The scarcity of hyperon-nucleon (YN) and hyperon-hyperon (YY) scattering data presents an enormous challenge for nuclear physicists in an attempt to derive baryon-baryon (BB) interactions from a microscopic level. Therefore $S=-1$ and $S=-2$ hypernuclei are important laboratories for testing BB interaction models and provide essential information for constructing realistic ...
The first measurement of p($\rm\bar{p}$)-d($\rm\bar{d}$) two-particle correlations in high-multiplicity pp collisions at $\sqrt{s}$ = 13 TeV will be presented. The studies of source sizes in these collision systems by the ALICE Collaboration enabled the possibility to study final-state interactions using two-particle momentum correlations. The measured correlation functions as well as...
X-ray spectroscopy of hadronic atoms is a strong measure
to determine the strong interaction between the hadron and
nuclei. At J-PARC, we have conducted two experiments on
exotic atoms with doubly strange hyperon, $\Xi^-$, aiming at
the world-first detection of the X rays. One is performed
as a byproduct of J-PARC E07 experiment (search for double
hypernuclei with hybrid emulsion...
We investigate the momentum correlation functions of $S = −2$ baryon pairs ($p\Xi^-$ and $\Lambda\Lambda$) produced in high-energy nuclear collisions. The momentum correlation function reflects the baryon-baryon interaction at low energies and the source function. We use the interaction potentials obtained from recent lattice QCD calculations at nearly physical quark masses and the static...
While the phi meson vacuum properties, such as mass and width, are well known, it is not clear how these properties will change once it is put in an extremely dense environment such as nuclear matter. To study how the phi meson behaves at finite density has been the goal of several past and near future experiments at multiple facilities [1-3]. Recently, ALICE at LHC has also obtained novel...
We estimate for the first time the mass shifts (scalar potentials) in symmetric nuclear matter of the $\Upsilon$ and $\eta_b$ mesons using an effective Lagrangian approach, as well as the in-medium mass of the $B^*$ meson by the quark-meson coupling model. The attractive potentials of both $\Upsilon$ and $\eta_b$ are expected to be strong enough for these mesons to be bound in various nuclei,...
Systems as $\mathrm{K^- p}$ and baryon--antibaryon ($\mathrm{B\overline{B}}$) are both characterised by the presence, already at the production threshold, of strong inelastic channels which can affect the properties and the formation of bound states and resonances.\
In the $\mathrm{\overline{K}N}$ system, the $\Lambda(1405)$ arises from the interplay between the $\mathrm{\overline{K}N}$ and...
Recent results for the $\eta_c$- and $J/\psi$-nucleus bound state energies for various nuclei are presented. Essential input for the calculation, namely the medium-modified $D$ and $D^{*}$ meson masses, as well as the density distributions in nuclei, are calculated within the quark-meson coupling model. The attractive potentials for the $\eta_C$ and $J/\psi$ mesons in the nuclear medium...
Color Glass Condensate is a powerful theoretical tool that is able to describe the dynamical properties of partons in the QCD non-perturbative regime, characterized by strong color fields and high parton density.
A previous study, performed for a wide range of energies measured at the Relativistic Heavy Ion Collider (RHIC) and at the Large Hadron Collider (LHC), has shown that observables...
Von Hamos spectrometers are widely used in several fields, ranging from pure physics applications to very different types of practical ones. However, these type of Bragg spectrometers are usally implied in high rate – high resolution experiments, where the typical source size can be as low as few tens of microns.
These limitations prevented them to be used as X-ray detectors for high...
