5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018;
Waikoloa, Hawaii
Session 2WHA: Insights into Hypernuclear Physics from Jlab & J-PARC I
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Chair: Emiko Hiyama, Kyushu University
Room: Hilton Kohala 4
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Tuesday, October 23, 2018
2:00PM - 2:30PM
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2WHA.00001: Lattice QCD study for the YN and YY interactions
Invited Speaker:
Takumi Doi
Lattice QCD calculation for baryon interactions play a vital role to build a bridge between particle, nuclear and astro-physics. In particular, the determination of hyperon forces is of urgent importance due to their impact on equation of state (EoS) of high dense matter. Lattice QCD opens a unique opportunity with its ability to achieve better precision for larger strangeness |S|, as opposed to the experimental determination which suffers from larger uncertainties for larger |S|.
Thanks to the progress in theoretical formulation, the increase of computational capability of supercomputers and the development of software algorithm, we successfully performed the first LQCD calculation of baryon forces with (almost) physical quark masses ($m_\pi$=146 MeV) on a large lattice box ($L^4$=(8fm)$^4$), where the interactions are extracted from Nambu-Bethe-Salpeter (NBS) correlators by the time-dependent HAL QCD method. In this talk, we present the latest results for YN and YY interactions and discuss their physical implications. |
Tuesday, October 23, 2018
2:30PM - 3:00PM
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2WHA.00002: Can a Λnn resonance constrain the Λn amplitude?
Invited Speaker:
Iraj Ruhi Afnan
We present results for the trajectories of the Λnn S-matrix pole in the complex energy plane as one varies the strength of the Λn interaction. This is achieved within the framework of the Faddeev equation in momentum space employing a separable two-body interaction that fits the singlet and triplet effective range parameters of several ΛN potentials. The energy of the pole is determined by examining the eigenvalues of the the kernel of the Faddeev integral equations after contour rotation to expose that portion of the energy plane where resonances could reside. It will be demonstrated that a ten percent change in the Λn interaction strength can give rise to a Λnn pole that could be classified as a low energy Λnn resonance, while a 40% increase in the strength of the interaction could give rise to a Λnn bound state. Considering the fact that there is a variation of ≈10% in the effective ranges parameters for the different ΛN potentials, one could conceive the possible existence of such a resonance. The question one can then ask is: Can such a resonance impose conditions on the Λn effective range parameters, and possibly shed light on charge symmetry breaking in the S = -1 sector? |
Tuesday, October 23, 2018
3:00PM - 3:30PM
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2WHA.00003: A measurement of Lambda-proton scattering cross sections at CLAS
Invited Speaker:
Kenneth H Hicks
The Lambda-proton scattering cross section has been newly measured using data from the CLAS detector. These data are useful in part because the previous measurements are all from the 1970’s, using bubble-chamber technology, and the current data have much higher statistics at higher momenta of the Lambda beam. The interest in these data is because the nuclear equation-of-state for neutron stars may change if strange matter is at their center, but this possibility depends on better knowledge of the Lambda-N and Lambda-NN scattering reactions. In this talk, I will describe the secondary beam production of Lambdas in the 40 cm-long liquid hydrogen target and the detection of the Lambda-proton scattering at CLAS. Preliminary cross sections for incident Lambda momenta above 0.8 GeV/c will be presented. A discussion of the implications of these new cross sections and a comparison with theoretical calculations will follow, along with future directions such as the separation of spin-triplet and spin-singlet scattering amplitudes using polarization observables. |
Tuesday, October 23, 2018
3:30PM - 4:00PM
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2WHA.00004: COFFEE BREAK
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