Nuclear Theory·nucl-th

Wednesday·January 31, 2018

13 papers—6 primary·7 cross-listed

07
[Submitted on 29 Jan 2018] (cross-list from hep-ph)
Vacuum-like jet fragmentation in a dense QCD medium
P. Caucal🇫🇷 · E. Iancu🇫🇷 · A.H. Mueller🇺🇸 · G. Soyez🇫🇷
We study the fragmentation of a jet propagating in a dense quark-gluon plasma. Using a leading, double-logarithmic approximation in perturbative QCD, we compute for the first time the effects of the medium on the vacuum-like emissions. We show that, due to the scatterings off the plasma, the in-medium parton showers differ from the vacuum ones in two crucial aspects: their phase-space is reduced and the first emission outside the medium can violate angular ordering. We compute the jet fragmentation function and find results in qualitative agreement with measurements at the LHC.
Comments:
5 pages, 3 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1801.09703 [pdf]
PRL(2018)·155 citations
08
[Submitted on 29 Jan 2018] (cross-list from hep-ph)
What does the matter created in high multiplicity proton-nucleus collisions teach us about the 3-D structure of the proton?
K. Dusling🇺🇸 · M. Mace🇺🇸 · R. Venugopalan🇺🇸
The study of multiparticle correlations and collectivity in the hot and dense matter created in collisions of heavy-ions as well as those of smaller systems such as proton--heavy-ion collisions has progressed to the point where detailed knowledge of the three-dimensional structure of the proton is needed to confront experimental data. We discuss results from a simple proof-of-principle initial state parton model which reproduces many features of the data on proton--heavy-ion collisions that are often ascribed to hydrodynamic flow. We outline how this model can be further improved with particular emphasis on missing elements in our understanding of the dynamical spatial and momentum structure of the proton.
Comments:
Talk at the 2017 QCD Evolution Workshop, Jefferson Lab, May 2017
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1801.09704 [pdf]
PoS(2018)·7 citations
09
[Submitted on 30 Jan 2018] (cross-list from hep-ph)
$N^{*}$ Production from $e^{+} e^{-}$ Annihilations
Bing-Song Zou🇨🇳
Up to now, the $N^{*}$ production from $e^{+} e^{-}$ annihilations has been studied only around charmonium region. Charmonium decays to $N^{*}$ s are analogous to (time-like) EM form factors in that the charm quark annihilation provides a nearly pointlike (ggg) current. Complementary to other sources, such as $π N$ , $e N$ and $γ N$ reactions, this new source for $N^{*}$ spectroscopy has a few advantages, such as an isospin filter and a low spin filter. The experimental results on $N^{*}$ from $e^{+} e^{-}$ annihilations and their phenomenological implications are reviewed. Possible new sources on $N^{*}$ production from $e^{+} e^{-}$ annihilations are discussed.
Comments:
7 pages, 4 figures. Contribution to the proceedings of the 11th International Workshop on the Physics of Excited Nucleons, 20-23 August 2017, University of South Carolina, Columbia, SC, USA
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1801.09822 [pdf]
5 citations
10
[Submitted on 30 Jan 2018] (cross-list from hep-ph)
Chiral Lagrangians with decuplet baryons to one loop
Shao-Zhou Jiang🇨🇳 · Yan-Rui Liu🇨🇳 · Hong-Qian Wang🇨🇳 · Qin-He Yang🇨🇳
We construct the relativistic chiral Lagrangians with decuplet baryons up to the order $O (p^{4})$ (one loop). For the meson-decuplet-decuplet couplings, there are 1, 13, 55, and 548 terms in the $O (p^{1})$ - $O (p^{4})$ order Lagrangians, respectively. For the meson-octet-decuplet Lagrangians, the number of independent terms from $O (p^{1})$ to $O (p^{4})$ are 1, 5, 67, and 611, respectively. For convenience of applications, the $π ΔΔ$ and $π N Δ$ chiral Lagrangians are picked out. This new form of $Δ$ Lagrangians is equivalent to the original isovector-isospinor one and we establish relations between these two forms.
Comments:
25 pages, 7 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1801.09879 [pdf]
PRD(2018)·7 citations
11
[Submitted on 30 Jan 2018] (cross-list from physics.atom-ph)
Comparing many-body approaches against the helium atom exact solution
Jing Li🇫🇷 · N. D. Drummond🇬🇧 · Peter Schuck🇫🇷 · Valerio Olevano🇫🇷
Over time, many different theories and approaches have been developed to tackle the many-body problem in quantum chemistry, condensed-matter physics, and nuclear physics. Here we use the helium atom, a real system rather than a model, and we use the exact solution of its Schrödinger equation as a benchmark for comparison between methods. We present new results beyond the random-phase approximation (RPA) from a renormalized RPA (r-RPA) in the framework of the self-consistent RPA (SCRPA) originally developed in nuclear physics, and compare them with various other approaches like configuration interaction (CI), quantum Monte Carlo (QMC), time-dependent density-functional theory (TDDFT), and the Bethe-Salpeter equation on top of the GW approximation. Most of the calculations are consistently done on the same footing, e.g. using the same basis set, in an effort for a most faithful comparison between methods.
Comments:
23 pages, 9 figures, 11 tables
Subjects:
Atomic Physics (physics.atom-ph); cond-mat.other (cond-mat.other); Nuclear Theory (nucl-th)
arXiv:
1801.09977 [pdf]
SciPost Phys.(2019)·7 citations
12
[Submitted on 28 Jan 2018] (cross-list from hep-ph)
Heavy flavour in high-energy nuclear collisions: theory overview of transport calculations
Andrea Beraudo🇮🇹
Transport calculations are the tool to study medium modifications of heavy-flavour particle distributions in high-energy nuclear collisions. We give a brief overview on their state-of-the art, on the information one can extract, on the questions remaining open and on further analysis to carry out in the near future.
Comments:
6 pages, proceedings of the workshop "LFC17: Old and New Strong Interactions from LHC to Future Colliders". arXiv admin note: substantial text overlap with arXiv:1710.02309
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1801.10037 [pdf]
Frascati Phys.Ser.(2017)·0 citations
13
[Submitted on 30 Jan 2018] (cross-list from hep-lat)
On chiral extrapolations of charmed meson masses and coupled-channel reaction dynamics
Xiao-Yu Guo🇩🇪 · Yonggoo Heo🇩🇪 · Matthias F.M. Lutz🇩🇪
We perform an analysis of QCD lattice data on charmed meson masses. The quark-mass dependence of the data set is used to gain information on the size of counter terms of the chiral Lagrangian formulated with open-charm states with J^P= 0^- and J^P =1^- quantum numbers. Of particular interest are those counter terms that are active in the exotic flavour sextet channel. A chiral expansion scheme where physical masses enter the extrapolation formulae is developed and applied to the lattice data set. Good convergence properties are demonstrated and an accurate reproduction of the lattice data based on ensembles of PACS-CS, MILC, ETMC and HSC with pion and kaon masses smaller than 600 MeV is achieved. It is argued that a unique set of low-energy parameters is obtainable only if additional information from HSC on some scattering observables is included in our global fits. The elastic and inelastic s-wave pi D and eta D scattering as considered by HSC is reproduced faithfully. Based on such low-energy parameters we predict 15 phase shifts and in-elasticities at physical quark masses but also for an additional HSC ensemble at smaller pion mass. In addition we find a clear signal for a member of the exotic flavour sextet states in the eta D channel, below the bar K D_s threshold. For the isospin violating strong decay width of the D_{s0}(2317) we obtain the range (104-116) keV.
Comments:
74 pages, 13 figures, 22 tables, published manuscript
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1801.10122 [pdf]
PRD(2018)·85 citations

Affiliations

first authorsco-authorsvia INSPIRE

Vacuum-like jet fragmentation in a dense QCD medium

What does the matter created in high multiplicity proton-nucleus collisions teach us about the 3-D structure of the proton?

N∗ Production from e+e− Annihilations

Chiral Lagrangians with decuplet baryons to one loop

Comparing many-body approaches against the helium atom exact solution

Heavy flavour in high-energy nuclear collisions: theory overview of transport calculations

On chiral extrapolations of charmed meson masses and coupled-channel reaction dynamics

Affiliations

$N^{*}$ Production from $e^{+} e^{-}$ Annihilations