Nuclear Theory·nucl-th

Thursday·February 14, 2019

7 papers—2 primary·5 cross-listed

03
[Submitted on 11 Feb 2019] (cross-list from nucl-ex)
Neutrinoless Double-Beta Decay: Status and Prospects
Michelle J. Dolinski🇺🇸 · Alan W. P. Poon🇺🇸 · Werner Rodejohann🇩🇪
Neutrinoless double-beta decay is a forbidden, lepton-number-violating nuclear transition whose observation would have fundamental implications for neutrino physics, theories beyond the Standard Model and cosmology. In this review, we summarize the theoretical progress to understand this process, the expectations and implications under various particle physics models, as well as the nuclear physics challenges that affect the precise predictions of the decay half-life. We will also provide a synopsis of the current and future large-scale experiments that aim at discovering this process in physically well-motivated half-life ranges.
Comments:
35 pages; Submitted for publication in the Annual Review of Nuclear and Particle Science, Volume 69
Subjects:
Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1902.04097 [pdf]
Ann.Rev.Nucl.Part.Sci.(2019)·677 citations
04
[Submitted on 12 Feb 2019] (cross-list from astro-ph.HE)
Gravitational Waves from Compact Dark Objects in Neutron Stars
C. J. Horowitz🇺🇸 · Sanjay Reddy🇺🇸
Dark matter could be composed of compact dark objects (CDOs). We find that the oscillation of CDOs inside neutron stars can be a detectable source of gravitational waves (GWs). The GW strain amplitude depends on the mass of the CDO, and its frequency is typically in the range 3-5 kHz as determined by the central density of the star. In the best cases, LIGO may be sensitive to CDO masses greater than or of order $1 0^{- 8}$ solar masses.
Comments:
5 pages, 1 figure, Phys. Rev. Lett. in press
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1902.04597 [pdf]
PRL(2019)·52 citations
05
[Submitted on 13 Feb 2019] (cross-list from hep-ph)
Theoretical predictions on polarization asymmetry for Drell-Yan process with spin-one deuteron and tensor-polarized structure function $b_{1}$
S. Kumano🇯🇵 · Qin-Tao Song🇯🇵
We report recent theoretical progress on a polarization asymmetry in the proton-deuteron Drell-Yan process with a polarized-deuteron target and the tensor-polarized structure function $b_{1}$ . Experimental measurements are possible at JLab for $b_{1}$ and at Fermilab for the Drell-Yan process. First, we show a theoretical estimate for the proton-deuteron Drell-Yan asymmetry in the Fermilab-E1039 experiment. We evolved tensor-polarized parton distribution functions, which explain existing HERMES $b_{1}$ data, at $Q^{2} = 2.5$ GeV $^{2}$ to the $Q^{2}$ range of the Fermilab Drell-Yan measurements. Then, we predicted that the asymmetry is of the order of a few percent. The Drell-Yan experiment has an advantage to probe the tensor-polarized antiquark distributions, which were suggested by the HERMES experiment as a finite sum for $b_{1}$ ( $\int d x b_{1} (x) \neq = 0$ ). Second, we predicted $b_{1}$ for the JLab experiment by the standard convolution model of the deuteron. Our theoretical $b_{1}$ structure function seems to be much different from the HERMES data. Furthermore, a significant distribution exists at very large $x$ ( $> 1$ ) beyond the kinematical limit $x_{ma x} = 1$ for the proton. Because the standard deuteron-model estimate is much different from the HERMES data, there could be an interesting development as a new hadron-physics field if future JLab data will be much different from our conventional prediction.
Comments:
6 pages, 4 figures; Proceedings of 23rd International Spin Physics Symposium (SPIN2018), 10-14 September, 2018; Ferrara, Italy
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
1902.04712 [pdf]
PoS(2019)·0 citations
06
[Submitted on 12 Feb 2019] (cross-list from hep-lat)
Light Nuclei from Lattice QCD: Spectrum, Structure and Reactions
Zohreh Davoudi🇺🇸
Lattice Quantum Chromodynamics (LQCD) studies of light nuclei have entered an era when first results on structure and reaction properties of light nuclei have emerged in recent years, complementing existing results on their lowest-lying spectra. Although in these preliminary studies the quark masses are still set to larger than the physical values, a few results at the physical point can still be deduced from simple extrapolations in the quark masses. The progress paves the road towards obtaining several important quantities in nuclear physics, such as nuclear forces and nuclear matrix elements relevant for pp fusion, single and double-beta decay processes, neutrino-nucleus scattering, searches for CP violation, nuclear response in direct dark-matter detection experiments, as well as gluonic structure of nuclei for an Electron-Ion Collider (EIC) program. Some of the recent developments, the results obtained, and the outlook of the field will be briefly reviewed in this talk, with a focus on results obtained by the Nuclear Physics From LQCD (NPLQCD) collaboration.
Comments:
10 pages, 8 figures. Contribution to the proceedings of the XXII International Conference on Few-Body Problems in Physics, July 9-13, 2018, Caen, France
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1902.04959 [pdf]
Springer Proc.Phys.(2020)·2 citations
07
[Submitted on 13 Feb 2019] (cross-list from hep-ph)
Quenching of hadron spectra in XeXe and PbPb collisions at the LHC
François Arleo🇫🇷 · Guillaume Falmagne🇫🇷
The $p_{⊥}$ dependence of the nuclear modification factor $R_{AA}$ measured in PbPb collisions at the LHC exhibits a universal shape, which can be very well reproduced in a simple energy loss model based on the BDMPS medium-induced gluon spectrum. We update a former study by including in the analysis the recent CMS measurements on $J / ψ$ production in PbPb collisions at $s = 5.02$ TeV and charged hadron production in XeXe collisions at $s = 5.44$ TeV. The average parton energy loss extracted from minimum bias XeXe collisions is reduced typically by 20% compared to PbPb collisions, consistent with a length dependence $⟨ ϵ ˉ ⟩ \propto L^{1.3 \pm 0.5}$ with $L \propto A^{1/3}$ .
Comments:
4 pages, 2 figures. Proceedings of the Hard Probes 2018 conference
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
1902.05032 [pdf]
PoS(2019)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE

Neutrinoless Double-Beta Decay: Status and Prospects

Gravitational Waves from Compact Dark Objects in Neutron Stars

Theoretical predictions on polarization asymmetry for Drell-Yan process with spin-one deuteron and tensor-polarized structure function b1​

Light Nuclei from Lattice QCD: Spectrum, Structure and Reactions

Quenching of hadron spectra in XeXe and PbPb collisions at the LHC

Affiliations

Theoretical predictions on polarization asymmetry for Drell-Yan process with spin-one deuteron and tensor-polarized structure function $b_{1}$