Nuclear Theory·nucl-th

Thursday·February 21, 2019

11 papers—5 primary·6 cross-listed

06
[Submitted on 19 Feb 2019] (cross-list from hep-th)
Holographic Signatures of Critical Collapse
Paul M. Chesler🇺🇸 · Benson Way🇨🇦
Critical phenomena in gravitational collapse exhibit the universal features of self-similarity, critical scaling, and the appearance of a naked singularity. We study critical collapse in AdS, focusing on holographic field theory observables. We demonstrate that the echoing period, critical exponent, and signatures of the naked singularity can all be extracted from the holographic stress tensor.
Comments:
5 pages, 7 figures, published version
Subjects:
High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
1902.07218 [pdf]
PRL(2019)·11 citations
07
[Submitted on 20 Feb 2019] (cross-list from hep-ph)
Conference Summary of QNP2018
S. Kumano (KEK/J-PARC)🇯🇵
This report is the summary of the Eighth International Conference on Quarks and Nuclear Physics (QNP2018). Hadron and nuclear physics is the field to investigate high-density quantum many-body systems bound by strong interactions. It is intended to clarify matter generation of universe and properties of quark-hadron many-body systems. The QNP is an international conference which covers a wide range of hadron and nuclear physics, including quark and gluon structure of hadrons, hadron spectroscopy, hadron interactions and nuclear structure, hot and cold dense matter, and experimental facilities. First, I introduce the current status of the hadron and nuclear physics field related to this conference. Next, the organization of the conference is explained, and a brief overview of major recent developments is discussed by selecting topics from discussions at the plenary sessions. They include rapidly-developing field of gravitational waves and nuclear physics, hadron interactions and nuclear structure with strangeness, lattice QCD, hadron spectroscopy, nucleon structure, heavy-ion physics, hadrons in nuclear medium, and experimental facilities of EIC, GSI-FAIR, JLab, J-PARC, Super-KEKB, and others. Nuclear physics is at a fortunate time to push various projects at these facilities. However, we should note that the projects need to be developed together with related studies in other fields such as gravitational physics, astrophysics, condensed-matter physics, particle physics, and fundamental quantum physics.
Comments:
10 pages, LaTeX, 1 style file, 3 figure files, Proceedings of Eighth International Conference on Quarks and Nuclear Physics (QNP2018), November 13-17, 2018, Tsukuba, Japan
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1902.07368 [pdf]
JPS Conf.Proc.(2019)·0 citations
08
[Submitted on 20 Feb 2019] (cross-list from hep-ph)
Impact of form factor uncertainties on interpretations of coherent elastic neutrino-nucleus scattering data
D. Aristizabal Sierra🇨🇱 · Jiajun Liao🇨🇳 · D. Marfatia🇺🇸
The standard model coherent elastic neutrino-nucleus scattering (CE $ν$ NS) cross section is subject to nuclear form factor uncertainties, mainly driven by the root-mean-square radius of the neutron density distribution. Motivated by COHERENT phases I-III and future multi-ton direct detection dark matter searches, we evaluate these uncertainties in cesium iodide, germanium, xenon and argon detectors. We find that the uncertainties become relevant for momentum transfers $q ≳ 20$ MeV and are essentially independent of the form factor parameterization. Consequently, form factor uncertainties are not important for CE $ν$ NS induced by reactor or solar neutrinos. Taking into account these uncertainties, we then evaluate their impact on measurements of CE $ν$ NS at COHERENT, the diffuse supernova background (DSNB) neutrinos and sub-GeV atmospheric neutrinos. We also calculate the relative uncertainties in the number of COHERENT events for different nuclei as a function of recoil energy. For DSNB and atmospheric neutrinos, event rates at a liquid argon detector can be uncertain to more than 5%. Finally, we consider the impact of form factor uncertainties on searches for nonstandard neutrino interactions, sterile neutrinos and neutrino generalized interactions. We point out that studies of new physics using CE $ν$ NS data are affected by neutron form factor uncertainties, which if not properly taken into account may lead to the misidentification of new physics signals. The uncertainties quantified here are also relevant for dark matter direct detection searches.
Comments:
13 pages, 7 figures, 1 table. Version to appear in JHEP
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1902.07398 [pdf]
JHEP(2019)·104 citations
09
[Submitted on 20 Feb 2019] (cross-list from hep-th)
Nuclear states and spectra in holographic QCD
Koji Hashimoto🇯🇵 · Yoshinori Matsuo🇹🇼 · Takeshi Morita🇯🇵
A new method to study nuclear physics via holographic QCD is proposed. Multiple baryons in the Sakai-Sugimoto background are described by a matrix model which is a low energy effective theory of D-branes of the baryon vertices. We study the quantum mechanics of the matrix model and calculate the eigenstates of the Hamiltonian. The obtained states are found to coincide with known nuclear and baryonic states, and have appropriate statistics and charges. Calculated spectra of the baryon/nucleus for small baryon numbers show good agreement with experimental data. For hyperons, the Gell-Mann--Okubo formula is approximately derived. Baryon resonances up to spin $5/2$ and isospin $5/2$ and dibaryon spectra are obtained and compared with experimental data. The model partially explains even the magic numbers of light nuclei, $N = 2, 8$ and $20$ .
Comments:
65 pages; v2: 69 pages, discussions on the magic number are clarified; v3: 75 pages, published version
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1902.07444 [pdf]
JHEP(2019)·16 citations
10
[Submitted on 20 Feb 2019] (cross-list from hep-ph)
Neutron Skin in CsI and Low-Energy Effective Weak Mixing Angle from COHERENT Data
Xu-Run Huang🇨🇳 · Lie-Wen Chen🇨🇳
Both the neutron skin thickness $Δ R_{n p}$ of atomic nuclei and the low-energy neutrino-nucleon ( $ν N$ ) interactions are of fundamental importance in nuclear and particle physics, astrophysics as well as new physics beyond the standard model (SM) but largely uncertain currently, and the coherent elastic neutrino-nucleus scattering (CE $ν$ NS) provides a clean way to extract their information. New physics beyond the SM may cause effectively a shift of the SM weak mixing angle $θ_{W}$ in low-energy $ν N$ interactions, leading to an effective weak mixing angle $θ_{W}^{*}$ . By analyzing the CE $ν$ NS data of the COHERENT experiment, we find that while a one-parameter fit to the COHERENT data by varying $Δ R_{n p}$ produces $Δ R_{n p}^{CsI} ≃ 0.6 8_{- 1.13}^{+ 0.91}$ fm for CsI with an unrealistically large central value by fixing $sin^{2} θ_{W}^{*}$ at the low-energy SM value of $sin^{2} θ_{W}^{SM} = 0.23857$ , a two-dimensional fit by varying $Δ R_{n p}$ and $sin^{2} θ_{W}^{*}$ leads to a strong positive correlation between $Δ R_{n p}$ and $sin^{2} θ_{W}^{*}$ with significantly smaller central values of $Δ R_{n p}^{CsI} ≃ 0.2 4_{- 2.03}^{+ 2.30}$ fm and $sin^{2} θ_{W}^{*} = 0.2 1_{- 0.10}^{+ 0.13}$ . Although the uncertainty is too large to claim a determination of $Δ R_{n p}^{CsI}$ and $sin^{2} θ_{W}^{*}$ , the present study suggests that the multi-dimensional fit is important in future analyses of high-precision CE $ν$ NS data. The implication of the possible deviation of $sin^{2} θ_{W}^{*}$ from $sin^{2} θ_{W}^{SM}$ on new physics beyond the SM is also discussed.
Comments:
6 pages, 2 figures. Presentation improved and discussions added. Accepted version to appear in PRD as a Rapid Communication
Subjects:
High Energy Physics — Phenomenology (hep-ph); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1902.07625 [pdf]
PRD(2019)·45 citations
11
[Submitted on 20 Feb 2019] (cross-list from hep-ph)
Constraining energy loss from high- $p_{T}$ azimuthal asymmetries
Carlota Andres🇺🇸 · Néstor Armesto🇪🇸 · Harri Niemi🇫🇮 · Risto Paatelainen🇫🇮 · Carlos A. Salgado🇪🇸
The nuclear modification factor $R_{AA}$ has been satisfactorily described by various jet quenching models. Nonetheless, all these formalisms, until very recently, underpredicted the high- $p_{T}$ (> 10 GeV) elliptic flow $v_{2}$ . We find that the simultaneous description of these observables requires to strongly suppress the quenching for the first $\sim 0.6$ fm after the collision. This shows the potential of jet quenching observables to constrain the dynamics of the initial stages of the evolution.
Comments:
Proceedings of the Hard Probes 2018 conference. 4 pages. 2 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1902.07643 [pdf]
PoS(2019)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Holographic Signatures of Critical Collapse

Conference Summary of QNP2018

Impact of form factor uncertainties on interpretations of coherent elastic neutrino-nucleus scattering data

Nuclear states and spectra in holographic QCD

Neutron Skin in CsI and Low-Energy Effective Weak Mixing Angle from COHERENT Data

Constraining energy loss from high-pT​ azimuthal asymmetries

Affiliations

Constraining energy loss from high- $p_{T}$ azimuthal asymmetries