Nuclear Theory·nucl-th

Wednesday·May 23, 2018

4 papers—1 primary·3 cross-listed

01
[Submitted on 22 May 2018]
Axial anomaly and hadronic properties in a nuclear medium
G. Fejos🇯🇵 · A. Hosaka🇯🇵
We investigate meson and nucleon dynamics at finite baryon density and temperature by coupling the nucleon field and the omega meson to the three-flavor linear sigma model and calculate hadronic properties around the nuclear liquid-gas transition. We apply the functional renormalization group method, and find that mesonic fluctuations increase the strength of the coefficient of the $U_{A} (1)$ breaking determinant operator as a function of the chiral condensate. As a consequence, we find that the actual value of the anomaly increases discontinuously at the first order nuclear liquid-gas transition. We calculate how mesonic masses and partial restoration of chiral symmetry are modified due to such an effect.
Comments:
14 pages, 7 figures, matches published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1805.08713 [pdf]
PRD(2018)·18 citations
02
[Submitted on 22 May 2018] (cross-list from hep-ph)
$K^{*}$ mesons with hidden charm arising from $K X (3872)$ and $K Z_{c} (3900)$ dynamics
Xiu-Lei Ren🇩🇪 · Brenda B. Malabarba🇧🇷 · Li-Sheng Geng🇨🇳 · K. P. Khemchandani🇨🇳 · A. Martinez Torres🇧🇷
Inspired by the recent discovery of the pentaquark states $P_{c} (4450)$ and $P_{c} (4380)$ , which can be viewed as excited nucleon states with hidden charm, we study the three-body interaction of a kaon and a pair of $D D ˉ^{*}$ in isospin 0 and 1. We show that the two body interactions stringently constrained by the existence of the $D_{s 0}^{*} (2317)$ , $D_{s 1}^{*} (2460)$ , $X (3872)$ , and $Z_{c} (3900)$ , which are widely believed to contain large $D K$ , $D^{*} K$ , and $D D ˉ^{*}$ components, inevitably lead to the existence of a heavy $K^{*}$ meson with hidden charm. Concrete coupled channel three-body calculations yield its mass and width as $(4307 \pm 2) - i (9 \pm 2)$ MeV with $I (J^{P}) = 1/2 (1^{-})$ . This state, if found experimentally, definitely cannot be accommodated in a $q q ˉ$ picture, and therefore presents a clear case of an exotic hadron.
Comments:
updated version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1805.08330 [pdf]
PLB(2018)·50 citations
03
[Submitted on 22 May 2018] (cross-list from hep-ph)
$D Ξ$ and $D^{*} Ξ$ Molecular States from One Boson Exchange
Ming-Zhu Liu🇨🇳 · Tian-Wei Wu🇨🇳 · Ju-Jun Xie🇨🇳 · Manuel Pavon Valderrama🇨🇳 · Li-Sheng Geng🇨🇳
We explore the existence of $D Ξ$ and $D^{*} Ξ$ molecular states within the one boson exchange model. We regularize the potential derived in this model with a form factor and a cut-off of the order of $1 GeV$ . To determine the cut-off, we use the condition that the $X (3872)$ is reproduced as a pole in the $J^{P C} = 1^{++}$ $D^{*} D ˉ$ amplitude. From this we find that the $J^{P} = \frac{1}{2}^{-}$ $D^{*} Ξ$ system is on the verge of binding and has an unnaturally large scattering length. For the $J^{P} = \frac{1}{2}^{-}$ $D Ξ$ and the $J^{P} = \frac{3}{2}^{-}$ $D^{*} Ξ$ systems the attraction is not enough to form a bound state. From heavy quark symmetry and the quark model we can extend the previous model to the $P Ξ_{QQ}$ and $P^{*} Ξ_{QQ}$ systems, with $P = D, B ˉ$ , $P^{*} = D^{*}, B ˉ^{*}$ and $Ξ_{QQ} = Ξ_{cc}, Ξ_{bb}$ . In this case we predict a series of triply heavy pentaquark-like molecules.
Comments:
11 pages, 3 figures, corresponds to published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
1805.08384 [pdf]
PRD(2018)·36 citations
04
[Submitted on 22 May 2018] (cross-list from nucl-ex)
Coherent vector meson production at an electron ion collider
Michael Lomnitz🇺🇸
Exclusive vector meson electroproduction over a broad $Q^{2}$ range offers a unique opportunity to probe the gluon structure of nuclei to measure nuclear shadowing, and to search for gluon saturation and/or the colored glass condensate at an Electron-Ion Collider. Understanding the kinematic distributions and cross sections for specific processes can impact detector design to maximize their acceptance and strengthen the physics case. We will discuss predictions from a Monte Carlo generator eSTARlight, a tool developed to study production of exclusive vector meson final states. We present final state distributions and production rates for the $ρ$ , $ϕ$ , J/ $ψ$ , $ψ^{'}$ and the $Υ$ states in $e p$ and $e A$ collisions at the different energies.
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1805.08586 [pdf]
PoS(2018)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE

Axial anomaly and hadronic properties in a nuclear medium

K∗ mesons with hidden charm arising from KX(3872) and KZc​(3900) dynamics

DΞ and D∗Ξ Molecular States from One Boson Exchange

Coherent vector meson production at an electron ion collider

Affiliations

$K^{*}$ mesons with hidden charm arising from $K X (3872)$ and $K Z_{c} (3900)$ dynamics

$D Ξ$ and $D^{*} Ξ$ Molecular States from One Boson Exchange