Nuclear Theory·nucl-th

Friday·February 1, 2019

12 papers—7 primary·5 cross-listed

08
A formally exact one-frequency-only Bethe-Salpeter-like equation. Similarities and differences between GW +BSE and self-consistent RPA
Valerio Olevano🇫🇷 · Julien Toulouse (LCT)🇫🇷 · Peter Schuck (IPNO, LPMMC)🇫🇷
A formally exact Bethe-Salpeter-like equation for the linear-response function is introduced with a kernel which depends only on the one frequency of the applied field. This is in contrast with the standard Bethe-Salpeter equation (BSE) which involves multiple-frequency integrals over the kernel and response functions. From the one-frequency kernel, known approximations are straightforwardly recovered. However, the present formalism lends itself to more powerful approximations. This is demonstrated with the exact analytical solution of the Hubbard molecule. Similarities and differences of the $G W$ +BSE approach with the self-consistent random-phase approximation (RPA) is also discussed.
↳ physics.chem-phcond-mat.othernucl-thJ.Chem.Phys.(2019)·15 citations
09
Modeling neutrino-nucleus interactions for neutrino oscillation experiments
G. D. Megias🇪🇸 · S. Dolan🇫🇷 · S. Bolognesi🇫🇷
We present our recent progress on the relativistic modeling of neutrino-nucleus reactions for their implementation in MonteCarlo event generators (GENIE, NEUT) employed in neutrino oscillation experiments. We compare charged-current neutrino and antineutrino cross sections obtained within the SuSAv2 model, which is based on the Relativistic Mean Field theory and on the analysis of the superscaling behavior exhibited by ( $e, e^{'}$ ) data. We also evaluate and discuss the impact of multi-nucleon excitations arising from 2p-2h states excited by the action of weak forces in a fully relativistic framework, showing for the first time their implementation in GENIE and their comparison with recent T2K data.
↳ hep-phhep-exnucl-thSpringer Proc.Phys.(2019)·4 citations
10
Revealing minijet dynamics via centrality dependence of the double parton interactions in proton-nucleus interactions
Massimiliano Alvioli🇮🇹 · Maxim Azarkin🇷🇺 · Boris Blok🇮🇱 · Mark Strikman🇺🇸
One of the main challenges hampering an accurate measurement of the double parton scattering (DPS) cross sections is the difficulty in separating the DPS from the leading twist (LT) contributions. We argue that such a separation can be achieved, and cross section of DPS measured, by exploiting the different centrality dependence of DPS and LT processes in proton-nucleus scattering. We developed a Monte Carlo implementation of the DPS processes which includes realistic nucleon-nucleon (NN) correlations in nuclei, an accurate description of transverse geometry of both hard and soft NN collisions as well as fluctuations of the strength of interaction of nucleon with nucleus (color fluctuation effects). Our method allows the calculation of probability distributions of single and double dijet events as a function of centrality, also distinguishing double hard scatterings originating from a single target nucleon and from two different nucleons. We present numerical results for the rate of DPS as a function of centrality, which relates the number of wounded nucleons and the sum of transverse energy of hadrons produced at large negative (along the nucleus direction) rapidities, which is experimentally measurable. We suggest a new quantity which allows to test the geometry of DPS and we argue that it is a universal function of centrality for different DPS processes. This quantity can be tested by analyzing existing LHC data. The method developed in this work can be extended to the search for triple parton interactions.
↳ hep-phnucl-thEPJC(2019)·15 citations
11
Possibilities of future double beta decay experiments to investigate inverted and normal ordering region of neutrino mass
A.S. Barabash🇷🇺
An overview of modern experiments on the search for neutrinoless double decay is presented. The obtained limits on the effective mass of the Majorana neutrino $⟨ m_{ν} ⟩$ are discussed taking into account the uncertainties in the value of the nuclear matrix elements (NMEs) and the value of the axial-vector constant $g_{A}$ . Predictions for the values of $⟨ m_{ν} ⟩$ from the results of oscillation experiments and modern cosmological data are presented. The possibilities of the next generation experiments with sensitivity to $⟨ m_{ν} ⟩$ at the level of $\sim$ 10-50 meV (studying mainly the inverted ordering (IO) region) are discussed. %Description of the most developed and promising projects is presented. The prospects for studying the normal ordering (NO) region are discussed too. It is shown that the possibilities of studying the NO depend on the mass of the lightest neutrino m $_{0}$ . In the limiting case of small mass (m $_{0}$ $\leq$ 0.1 meV), the values of $⟨ m_{ν} ⟩$ $\approx$ 1-4 meV are predicted, which makes the study of this region inaccessible by the next generation experiments. But there is an allowed region of m $_{0}$ (7-30 meV) in the framework of NO, where the predicted values for $⟨ m_{ν} ⟩$ could be $\sim$ 10-30 meV and that is quite achievable for the next generation experiments. The possibility to rich in the future sensitivity to $⟨ m_{ν} ⟩$ at the level of $\sim$ 1-10 meV is also discussed.
↳ nucl-exnucl-thFront.in Phys.(2019)·26 citations
12
JIMWLK evolution and small-x asymptotics of 2n-tuple Wilson line correlators
Khatiza Banu🇮🇳 · Mariyah Siddiqah🇮🇳 · Raktim Abir🇮🇳
JIMWLK equation tells how gauge invariant higher order Wilson line correlators would evolve at high energy. In this article we present a convenient integro-differential form of this equation, for 2n-tuple correlator, where all real and virtual terms are explicit. The `real' terms correspond to splitting (say at position z) of this 2n-tuple correlator to various pairs of 2m-tuple and (2n+2-2m)-tuple correlators whereas `virtual' terms correspond to splitting into pairs of 2m-tuple and (2n-2m)-tuple correlators. Kernels of virtual terms with m=0 (no splitting) and of real terms with m=1 (splitting with atleast one dipole) have poles and when integrated over z they do generate ultraviolet logarithmic divergences, separately for real and virtual terms. Except these two cases in all other terms the corresponding kernels, separately for real and virtual terms, have rather soften ultraviolet singularity and when integrated over z do not generate ultraviolet logarithmic divergences. We went on to study the solution of the JIMWLK equation for the 2n-tuple Wilson line correlator in the strong scattering regime where all transverse distances are much larger than inverse saturation momentum and shown that it also exhibits geometric scaling like color dipole deep inside saturation region.
↳ hep-thhep-lathep-phnucl-thPRD(2019)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE

A formally exact one-frequency-only Bethe-Salpeter-like equation. Similarities and differences between GW +BSE and self-consistent RPA

Modeling neutrino-nucleus interactions for neutrino oscillation experiments

Revealing minijet dynamics via centrality dependence of the double parton interactions in proton-nucleus interactions

Possibilities of future double beta decay experiments to investigate inverted and normal ordering region of neutrino mass

JIMWLK evolution and small-x asymptotics of 2n-tuple Wilson line correlators

Affiliations