nucl-th digest · May 5, 2021

Structure of

Λ

(1405) resonance and

γ p \to K^{+} + (π Σ)^{0}

reaction

Three-body calculations of

K K ˉ N

system with quantum numbers

I = 1/2

J^{π} = (\frac{1}{2})^{+}

were performed. Using separable potentials for two-body interactions, we calculated the

π Σ

mass spectra for the

(K ˉ N)_{I = 0} + K^{+} \to (π Σ)^{0} K^{+}

reaction on the basis of three-body Alt-Grassberger-Sandhas equations in the momentum representation. In this regard, different types of

K ˉ N - π Σ

potentials based on phenomenological and chiral SU(3) approach are used. The possibility to observe the trace of

Λ (1405)

resonance in

(π Σ)^{0}

mass spectra was studied. Using the

χ^{2}

fitting, it was shown that the mass of

Λ

(1405) resonance is about 1417

MeV / c^{2}

Comments:: 10 pages, 6 figures, accepted for publication in PRC
Subjects:: Nuclear Theory (nucl-th)
arXiv:: 2105.01367 [pdf]

PRC(2021)·3 citations

[Submitted on 4 May 2021]

The impact of nuclear deformation on relativistic heavy-ion collisions: assessing consistency in nuclear physics across energy scales

Giuliano Giacalone🇩🇪 · Jiangyong Jia🇺🇸 · Chunjian Zhang🇺🇸

In the hydrodynamic framework of heavy-ion collisions, elliptic flow, $v_{2}$ , is sensitive to the quadrupole deformation, $β$ , of the colliding ions. This enables one to test whether the established knowledge on the low-energy structure of nuclei is consistent with collider data from high-energy experiments. We derive a formula based on generic scaling laws of hydrodynamics to relate the difference in $v_{2}$ measured between collision systems that are close in size to the value of $β$ of the respective species. We validate our formula in simulations of 238U+238U and 197Au+197Au collisions at top Relativistic Heavy Ion Collider (RHIC) energy, and subsequently apply it to experimental data. Using the deformation of 238U from low-energy experiments, we find that RHIC $v_{2}$ data implies $0.16 ≲ ∣ β ∣ ≲ 0.20$ for 197Au nuclei, i.e., significantly more deformed than reported in the literature, posing an interesting puzzle in nuclear phenomenology.

Comments:: 6 pages and 4 figures, published version
Subjects:: Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:: 2105.01638 [pdf]

PRL(2021)·124 citations

Wednesday·May 5, 2021

Structure of $Λ$ (1405) resonance and $γ p \to K^{+} + (π Σ)^{0}$ reaction

The impact of nuclear deformation on relativistic heavy-ion collisions: assessing consistency in nuclear physics across energy scales

Affiliations

Structure of Λ(1405) resonance and γp→K++(πΣ)0 reaction

The impact of nuclear deformation on relativistic heavy-ion collisions: assessing consistency in nuclear physics across energy scales

Affiliations

Structure of $Λ$ (1405) resonance and $γ p \to K^{+} + (π Σ)^{0}$ reaction