Nuclear Theory·nucl-th

Tuesday·January 29, 2019

20 papers—11 primary·9 cross-listed

01
[Submitted on 26 Jan 2019]
Transverse momentum distributions of charmonium states with the statistical hadronization model
Anton Andronic🇩🇪 · Peter Braun-Munzinger🇩🇪 · Markus K. Köhler🇩🇪 · Krzysztof Redlich🇩🇪 · Johanna Stachel🇩🇪
Calculations and predictions are presented within the framework of the statistical hadronization model for transverse momentum spectra of the charmonium states J/ $ψ$ , $ψ (2 S)$ and $X (3872)$ produced in nucleus-nucleus collisions at LHC energies. The results are confronted with available data and exhibit very good agreement by using particle flow profiles from state-of-the-art hydrodynamic calculations. For $X (3872)$ production in Pb-Pb collisions we predict a transverse momentum distribution similar in shape to that for J/ $ψ$ with a strong enhancement at low transverse momenta and a production yield of about 1\% relative to that for J/ $ψ$ .
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1901.09200 [pdf]
PLB(2019)·139 citations
02
[Submitted on 26 Jan 2019]
Theoretical Review of Charmonium Production with Different $p_{T}$ in the Hot Medium
Baoyi Chen · Carsten Greiner🇩🇪
Charmonia with different transverse momentum $p_{T}$ usually comes from different mechanisms in the relativistic heavy ion collisions. This work tries to review the theoretical studies on quarkonium evolutions in the deconfined medium produced in p-Pb and Pb-Pb collisions. The charmonia with high $p_{T}$ are mainly from the initial hadronic collisions, and therefore sensitive to the initial energy density of the bulk medium. For those charmonia within $0.1 < p_{T} < 5$ GeV/c at the energies of Large Hadron Collisions (LHC), They are mainly produced by the recombination of charm and anti-charm quarks in the medium. In the extremely low $p_{T} \sim 1/ R_{A}$ ( $R_{A}$ is the nuclear radius), additional contribution from the coherent interactions between electromagnetic fields generated by one nucleus and the target nucleus plays a non-negligible role in the $J / ψ$ production even in semi-central Pb-Pb collisions.
Comments:
6 pages, 13 figures, proceeding for CHARM 2018
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1901.09202 [pdf]
EPJ Web Conf.(2019)·1 citation
03
[Submitted on 28 Jan 2019]
Probing nuclear bubble configuration by proton induced reaction
Xiao-Hua Fan🇨🇳 · Gao-Chan Yong🇨🇳 · Wei Zuo🇨🇳
In the framework of the isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model, nuclear bubble configuration in the hypothetical $^{48}$ Si nucleus is studied by proton induced central reaction at an incident beam energy of 0.8 GeV/nucleon. It is found that along the beam direction more energetic protons are emitted with bubble configuration in the target. In the forward angles, compared with the case without bubble configuration, less scattered energetic protons are emitted with bubble configuration in the target. We thus provide a new way to probe the bubble configuration in nuclei.
Comments:
4 pages, 4 figures, accepted by PRC, Rapid Communication
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
1901.09497 [pdf]
PRC(2019)·16 citations
04
[Submitted on 28 Jan 2019]
Forward and backward comparative study of jet properties in pp collisions at \sqrt{s}=7 TeV
Yu-Liang Yan🇨🇳 · Ayut Limphirat🇹🇭 · Dai-Mei Zhou🇨🇳 · Pornrad Srisawad🇹🇭 · Yupeng Yan🇹🇭 · Chunbin Yang🇨🇳 · Xu Cai🇨🇳 · Ben-Hao Sa🇨🇳
We propose a forward method, based on the PYTHIA6.4, to study theoretically the jet properties in the ultra-relativistic pp collisions. In the forward method, the partonic initial states are first generated with PYTHIA6.4 and then hadronized in the Lund srting fragmentation regime, and finally hadronic jets are constructed from the created hadrons. Jet properties calculated in the forward method for pp collisions at \sqrt{s}=7 TeV are comparable with the corresponding ones calculated with usual anti-k_t algorithm (backward method) in the PYTHIA6.4. The comparison between the results in the backward and forward methods may bring benefit to the understanding of the partonic origin of jets in the backward method.
Comments:
6 pages, 5 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1901.09500 [pdf]
CPC(2020)·0 citations
05
[Submitted on 28 Jan 2019]
Impact of different extended components of mean field models on transport coefficients of quark matter and their causal aspects
Chowdhury Aminul Islam🇮🇳 · Jayanta Dey🇮🇳 · Sabyasachi Ghosh🇮🇳
Role of different extensions of Nambu\textendash Jona-Lasinio (NJL) model like addition of vector interaction, Polyakov loop extended version (PNJL) and the entangled PNJL (EPNJL) models on transport coefficients like shear viscosity, bulk viscosity, electrical conductivity and thermal conductivity are critically analyzed. We have considered the standard expressions of transport coefficients, obtained in relaxation time approximation of kinetic theory. Influence of temperature dependent order parameters on temperature profile of transport coefficients are analyzed. Causal aspect of massless case to these different extended components of mean field models are also picturized, where an approximated lower and upper bound are drawn for shear relaxation time.
Comments:
19 pages, 7 figures, accepted in Phy. rev. C
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1901.09543 [pdf]
PRC(2021)·15 citations
06
[Submitted on 28 Jan 2019]
Folding model analysis of $^{12} C -^{12} C$ and $^{16} O -^{16} O$ elastic scattering using the density-dependent LOCV averaged effective interaction
M. Rahmat · M. Modarres
The averaged effective two-body interaction (\textit{AEI}) which can be generated through the lowest order constrained variational (\textit{LOCV}) method for symmetric nuclear matter (\textit{SNM}) with the input \textit{Reid}68 nucleon-nucleon potential, is used as the effective nucleon-nucleon potential in the folding model to describe the heavy-ion (\textit{HI}) elastic scattering cross sections. The elastic scattering cross sections of $^{12} C -^{12} C$ and $^{16} O -^{16} O$ systems are calculated in the above frameworks. The results are compared with the corresponding calculations coming from the fitting procedures with the input finite range \textit{DDM3Y1-Reid} potential and the available experimental data at different incident energies. It is shown that a reasonable description of the elastic $^{12} C -^{12} C$ and $^{16} O -^{16} O$ scattering data at the low and the medium energies can be obtained by using the above \textit{ LOCV AEI}, without any need to define a parameterize density dependent function in the effective nucleon-nucleon potential, which is formally considered in the typical \textit{DDM3Y1-Reid} interactions.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1901.09550 [pdf]
PRC(2018)·7 citations
07
[Submitted on 28 Jan 2019]
Charmed nuclei within a microscopic many-body approach
I. Vidana🇮🇹 · A. Ramos🇪🇸 · C. E. Jimenez-Tejero🇪🇸
Single-particle energies of the $Λ_{c}$ chamed baryon are obtained in several nuclei from the relevant self-energy constructed within the framework of a perturbative many-body approach. Results are presented for a charmed baryon-nucleon ( $Y_{c} N$ ) potential based on a SU(4) extension of the meson-exchange hyperon-nucleon potential $A ~$ of the Jülich group. Three different models (A, B and C) of this interaction, that differ only on the values of the couplings of the scalar $σ$ meson with the charmed baryons, are considered. Phase shifts, scattering lengths and effective ranges are computed for the three models and compared with those predicted by the $Y_{c} N$ interaction derived in Eur. Phys. A {\bf 54}, 199 (2018) from the extrapolation to the physical pion mass of recent results of the HAL QCD Collaboration. Qualitative agreement is found for two of the models (B and C) considered. Our results for $Λ_{c}$ -nuclei are compatible with those obtained by other authors based on different models and methods. We find a small spin-orbit splitting of the $p -, d -$ and $f -$ wave states as in the case of single $Λ$ -hypernuclei. The level spacing of $Λ_{c}$ single-particle energies is found to be smaller than that of the corresponding one for hypernuclei. The role of the Coulomb potential and the effect of the coupling of the $Λ_{c} N$ and $Σ_{c} N$ channels on the single-particle properties of $Λ_{c} -$ nuclei are also analyzed. Our results show that, despite the Coulomb repulsion between the $Λ_{c}$ and the protons, even the less attractive one of our $Y_{c} N$ models (model C) is able to bind the $Λ_{c}$ in all the nuclei considered. The effect of the $Λ_{c} N - Σ_{c} N$ coupling is found to be almost negligible due to the large mass difference of the $Λ_{c}$ and $Σ_{c}$ baryons.
Comments:
10 pages, 6 figures, 4 tables
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1901.09644 [pdf]
PRC(2019)·16 citations
08
[Submitted on 28 Jan 2019]
The APR equation of state for simulations of supernovae, neutron stars and binary mergers
A. S. Schneider🇸🇪 · C. Constantinou🇺🇸 · B. Muccioli🇺🇸 · M. Prakash🇺🇸
Differences in the equation of state (EOS) of dense matter translate into differences in astrophysical simulations and their multi-messenger signatures. Thus, extending the number of EOSs for astrophysical simulations allows us to probe the effect of different aspects of the EOS in astrophysical phenomena. In this work, we construct the EOS of hot and dense matter based on the Akmal, Pandharipande, and Ravenhall (APR) model and thereby extend the open-source SROEOS code which computes EOSs of hot dense matter for Skyrme-type parametrizations of the nuclear forces. Unlike Skrme-type models, in which parameters of the interaction are fit to reproduce the energy density of nuclear matter and/or properties of heavy nuclei, the EOS of APR is obtained from potentials resulting from fits to nucleon-nucleon scattering and properties of light nuclei. In addition, this EOS features a phase transition to a neutral pion condensate at supra-nuclear densities. We show that differences in the effective masses between EOSs have consequences for the properties of nuclei in the sub-nuclear inhomogeneous phase of matter. We also test the new EOS of APR in spherically symmetric core-collapse of massive stars with $15 M_{⊙}$ and $40 M_{⊙}$ , respectively. We find that the phase transition in the EOS of APR speeds up the collapse of the star. However, this phase transition does not generate a second shock wave or another neutrino burst as reported for the hadron-to-quark phase transition. The reason for this difference is that the onset of the phase transition in the EOS of APR occurs at larger densities than for the quark-to-hadron transition employed earlier which results in a significantly smaller softening of the high density EOS.
Comments:
35 pages, 17 figures, 5 tables
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
1901.09652 [pdf]
PRC(2019)·91 citations
09
[Submitted on 28 Jan 2019]
Single pole dominance in short- and intermediate-range $N N$ interaction
V.I. Kukulin · V.N. Pomerantsev · O.A. Rubtsova · M.N. Platonova
It is demonstrated that both elastic and inelastic $N N$ scattering at laboratory energies up to 600--800 MeV, at least in some partial waves characterized by a large inelasticity, can be described by a superposition of the conventional long-range one-pion exchange and a specific short-range interaction induced by the $s$ -channel dibaryon exchange. For the $^{3} P_{2}$ , $^{1} D_{2}$ and $^{3} F_{3}$ partial waves, the pole parameters giving the best fit of the real and imaginary parts of the $N N$ phase shifts are consistent with the parameters of the respective isovector dibaryon resonances found experimentally. In the $^{1} S_{0}$ channel, the suggested interaction gives two poles of the $S$ -matrix -- the well-known singlet deuteron and an excited dibaryon. On the basis of the results presented, a conclusion is made about the nature of $N N$ interaction and its strong channel dependence.
Comments:
8 pages, 6 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1901.09682 [pdf]
2 citations
10
[Submitted on 28 Jan 2019]
Theoretical exploration of $S$ -factors for nuclear reactions of astrophysical importance
Vinay Singh · Joydev Lahiri · D. N. Basu
We present here a robust analytical model based on nuclear reaction theory for non-resonant fusion cross sections near Coulomb barrier. The astrophysical $S$ -factors involving stable and neutron rich isotopes of C, O, Ne, Mg and Si for fusion reactions have been calculated in the centre of mass energy range of 2-30 MeV. The model is based on the tunneling through barrier arising out of nuclear, Coulomb and centrifugal potentials. Our formalism predicts precisely the suppression of $S$ -factor at sub-barrier energies which are of astrophysical interest. The cross sections can be convoluted with Maxwell-Boltzmann distribution of energies to obtain thermo- or pycno- nuclear reaction rates relevant to nucleosynthesis at high density environments and stellar burning at high temperatures as well as for $^{34}$ Ne $+$ $^{34}$ Ne fusion occurring in the inner crust of accreting neutron stars.
Comments:
8 pages including 12 figures and 1 table
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1901.09705 [pdf]
NPA(2019)·6 citations
11
[Submitted on 28 Jan 2019]
Confronting gravitational-wave observations with modern nuclear physics constraints
I. Tews🇺🇸 · J. Margueron🇫🇷 · S. Reddy🇺🇸
Multi-messenger observations of neutron star (NS) mergers have the potential to revolutionize nuclear astrophysics. They will improve our understanding of nucleosynthesis, provide insights about the equation of state (EOS) of strongly-interacting matter at high densities, and enable tests of the theory of gravity and of dark matter. Here, we focus on the EOS, where both gravitational waves (GWs) from neutron-star mergers and X-ray observations from space-based detectors such as NICER will provide more stringent constraints on the structure of neutron stars. Furthermore, recent advances in nuclear theory have enabled reliable calculations of the EOS at low densities using effective field theory based Hamiltonians and advanced techniques to solve the quantum many-body problem. In this paper, we address how the first observation of GWs from GW170817 can be combined with modern calculations of the EOS to extract useful insights about the EOS of matter encountered inside neutron stars. We analyze the impact of various uncertainties, the role of phase transitions in the NS core, and discuss how future observations will improve our understanding of dense matter.
Comments:
18 pages, 10 figures, published version; Invited contribution prepared for the EPJ A Topical Issue "First joint gravitational wave and electromagnetic observations: Implications for nuclear and particle physics."
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1901.09874 [pdf]
EPJA(2019)·113 citations
12
[Submitted on 25 Jan 2019] (cross-list from hep-ph)
Predictions for energy correlators probing substructure of groomed heavy quark jets
Christopher Lee🇺🇸 · Prashant Shrivastava🇺🇸 · Varun Vaidya🇺🇸
We develop an effective field theory (EFT) framework to perform an analytic calculation for energy correlator observables computed on groomed heavy-quark jets. A soft-drop grooming algorithm is applied to a jet initiated by a massive quark to minimize soft contamination effects such as pile-up and multi-parton interactions. We specifically consider the two-particle energy correlator as an initial application of this EFT framework to compute heavy quark jet substructure. We find that there are different regimes for the event shapes, depending on the size of the measured correlator observable, that require the use of different EFT formulations, in which the quark mass and grooming parameters may be relevant or not. We use the EFT to resum large logarithms in the energy correlator observable in terms of the momentum of a reconstructed heavy hadron to NLL $^{'}$ accuracy and subsequently match it to a full QCD $O (α_{s})$ cross section, which we also compute. We compare our predictions to simulations in PYTHIA for $e^{+} e^{-}$ collisions. We find a good agreement with partonic simulations, as well as hadronic ones with an appropriate shape function used to describe nonperturbative effects and the heavy quark hadron decay turned off. We also predict the scaling behavior for the leading nonperturbative power correction due to hadronization. Consequently, we can give a prediction for the energy correlator distribution at the level of the reconstructed heavy hadron. This work provides a general framework for the analysis of heavy quark jet substructure observables.
Comments:
50 pages, 16 figures. v2: improved discussions of phase space boundaries and transition points in EFT vs. fixed-order computations, numerous other minor clarifications and corrections. v3: minor clarifications and corrections, version published in JHEP
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1901.09095 [pdf]
JHEP(2019)·43 citations
13
[Submitted on 26 Jan 2019] (cross-list from hep-ph)
Heavy quark spin multiplet structure of $P_{c}$ -like pentaquark as P-wave hadronic molecular state
Yuki Shimizu🇯🇵 · Yasuhiro Yamaguchi🇯🇵 · Masayasu Harada🇯🇵
We study the heavy quark spin (HQS) multiplet structure of P-wave $Q Q ˉ q q q$ -type pentaquarks treated as molecules of a heavy meson and a heavy baryon. We define the light-cloud spin (LCS) basis decomposing the meson-baryon spin wavefunction into the LCS and HQS parts. Introducing the LCS basis, we find HQS multiplets classified by the LCS; five HQS singlets, two HQS doublets, and three HQS triplets. We construct the one-pion exchange potential respecting the heavy quark spin and chiral symmetries to demonstrate which HQS multiplets are realized as a bound state. By solving the coupled channel Schrödinger equations, we study the heavy meson-baryon systems with $I = 1/2$ and $J^{P} = (1/ 2^{+}, 3/ 2^{+}, 5/ 2^{+}, 7/ 2^{+})$ . The bound states which have same LCS structure are degenerate at the heavy quark limit, and the degeneracy is resolved for finite mass. This HQS multiplet structure will be measured in the future experiments.
Comments:
13 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1901.09215 [pdf]
PTEP(2019)·12 citations
14
[Submitted on 26 Jan 2019] (cross-list from quant-ph)
Coherence Optimization in Neutron Interferometry through Defocussing
J. Nsofini🇨🇦 · D. Sarenac🇨🇦 · D. G. Cory🇨🇦 · D. A. Pushin🇨🇦
A zero-area four-blade perfect crystal neutron interferometer (NI) possess a decoherence-free subspace (DFS) for low-frequency mechanical vibrations and thus is easier to site. %has the potential to broaden the application of crystal-based neutron interferometry to a higher number of neutron sources. However, unlike the standard three-blade Mach-Zehnder NI the ideal contrast of this four-blade NI geometry is less than one. By applying a recently introduced quantum information model for dynamical diffraction we show that the contrast for the four-blade DFS NI can be increased by offsetting the focusing condition. The contrast optimization leads to an NI geometry where the distances between the centers of the blades are equidistant. An experiment is proposed to verify the increase in contrast.
Comments:
& pages, 5 figures
Subjects:
Quantum Physics (quant-ph); cs.IT (cs.IT); math.IT (math.IT); Nuclear Theory (nucl-th)
arXiv:
1901.09282 [pdf]
PRA(2019)·4 citations
15
[Submitted on 27 Jan 2019] (cross-list from hep-ph)
Updated analysis of recent results on electron and positron elastic scattering on proton
V. V. Bytev🇷🇺 · E. Tomasi-Gustafsson🇫🇷
We discuss recent experimental results concerning the cross section ratio of positron over electron elastic scattering on protons, and compare with the predictions of a pre-existent calculation. The deviation from unity of this ratio, $i . e .$ , a charge asymmetry different from zero, is the signature of contributions beyond the Born approximation. After reviewing the published results, we compare the elastic data to a calculation which includes the diagram corresponding to two-photon exchange. It turns out that all the data on the cross section ratio, in the limit of their precision, do not show evidence of enhanced two-photon contribution beyond the expected percent level. Our results confirm that experimental evidence for a large contribution of two-photon exchange is not yet found.
Comments:
23 pages, 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1901.09379 [pdf]
PRC(2019)·10 citations
16
[Submitted on 28 Jan 2019] (cross-list from hep-ph)
Elastic proton-proton scattering at LHC energies in holographic QCD
Wei Xie🇨🇳 · Akira Watanabe🇨🇳 · Mei Huang🇨🇳
The cross sections of the high energy proton-proton scattering are studied in a holographic QCD model, focusing on the Regge regime. In our model setup, the involved nonperturbative partonic dynamics is described by the Pomeron exchange, which is realized by applying the Reggeized spin-2 particle propagator together with the proton gravitational form factor obtained from the bottom-up AdS/QCD model. Our model includes three adjustable parameters which are to be fitted by experimental data. We show that both the resulting differential and total cross sections are consistent with data, including the ones recently measured at $s = 13$ TeV by the TOTEM collaboration at the LHC. Our results imply that the present framework works well in the considered TeV scale, and further applications to other high energy scattering processes, in which the involved strong interaction can be approximated by the Pomeron exchange, are possible.
Comments:
21 pages, 5 figures, minor errors in numerical calculations corrected, conclusions unchanged
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1901.09564 [pdf]
JHEP(2019)·26 citations
17
[Submitted on 28 Jan 2019] (cross-list from hep-ph)
Spin polarization evolution in a boost invariant hydrodynamical background
Wojciech Florkowski🇵🇱 · Avdhesh Kumar🇵🇱 · Radoslaw Ryblewski🇵🇱 · Rajeev Singh🇵🇱
Relativistic hydrodynamic equations for particles with spin one-half are used to determine the space-time evolution of the spin polarization in a boost-invariant and transversely homogeneous background. The hydrodynamic approach uses the forms of the energy-momentum and spin tensors based on de Groot, van Leeuwen, and van Weert formalism. Our calculations illustrate how the formalism of hydrodynamics with spin can be used to determine physical observables related to the spin polarization and how the latter can be compared with the experimental data.
Comments:
12 pages, 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1901.09655 [pdf]
PRC(2019)·110 citations
18
[Submitted on 15 Jan 2019] (cross-list from cond-mat.mes-hall)
Excited-State Quantum Phase Transitions in Bosonic Lattice Systems
Michal Macek
Concentrating on bosonic lattice systems, we ask whether and how Excited State Quantum Phase Transition (ESQPT) singularities occur in condensed matter systems with ground state QPTs. We study in particular the spectral singularities above the ground-state phase diagram of the boson Hubbard model. As a general prerequisite, we point out the analogy between ESQPTs and van Hove singularities (vHss).
Comments:
3 pages, 2 figures, to appear in AIP Conference Proceedings, Symmetries And Order: Algebraic Methods In Many Body Systems, In honor of Professor Francesco Iachello on the occasion of his retirement, October 5-6, 2018 at Yale University (v2 minor reformulations)
Subjects:
Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
arXiv:
1901.09677 [pdf]
AIP Conf.Proc.(2019)·1 citation
19
[Submitted on 28 Jan 2019] (cross-list from nucl-ex)
Neutron skin and signature of the $N$ = 14 shell gap found from measured proton radii of $^{17 - 22}$ N
S. Bagchi · R. Kanungo · W. Horiuchi · G. Hagen · T. D. Morris · S. R. Stroberg · T. Suzuki · F. Ameil · J. Atkinson · Y. Ayyad · D. Cortina-Gil · I. Dillmann and 28 other authors
A thick neutron skin emerges from the first determination of root mean square radii of the proton distributions for $^{17 - 22}$ N from charge changing cross section measurements around 900 $A$ MeV at GSI. Neutron halo effects are signaled for $^{22}$ N from an increase in the proton and matter radii. The radii suggest an unconventional shell gap at $N$ = 14 arising from the attractive proton-neutron tensor interaction, in good agreement with shell model calculations. $A b$ $ini t i o$ , in-medium similarity re-normalization group, calculations with a state-of-the-art chiral nucleon-nucleon and three-nucleon interaction reproduce well the data approaching the neutron drip-line isotopes but are challenged in explaining the complete isotopic trend of the radii.
Comments:
18 pages, 3 figures
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1901.09707 [pdf]
PLB(2019)·55 citations
20
[Submitted on 28 Jan 2019] (cross-list from hep-ph)
Phenomenological NLO analysis of eta(c) production at the LHC in the collider and fixed-target modes
Yu Feng🇨🇳 · Jibo He🇫🇷 · Jean-Philippe Lansberg🇫🇷 · Hua-Sheng Shao🇫🇷 · Andrii Usachov🇫🇷 · Hong-Fei Zhang🇨🇳
In view of the good agreement between the LHCb prompt-eta(c) data at sqrt(s)=7 and 8 TeV and the NLO colour-singlet model predictions --i.e. the leading v^2 NRQCD contribution--, we provide predictions in the LHCb acceptance for the forthcoming 13 TeV analysis bearing on data taken during the LHC Run2. We also provide predictions for sqrt(s)=115 GeV for proton-hydrogen collisions in the fixed-target mode which could be studied during the LHC Run3. Our predictions are complemented by a full theoretical uncertainty analysis. In addition to cross section predictions, we elaborate on the uncertainties on the p bar-p branching ratio --necessary for data-theory comparison-- and discuss other usable branching fractions for future studies.
Comments:
10 pages, 4 figures, 1 table, LaTeX uses elsarticle
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1901.09766 [pdf]
NPB(2019)·28 citations

Affiliations

first authorsco-authorsvia INSPIRE