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Nuclear Theory·nucl-th

Wednesday·July 3, 2019

11 papers—3 primary·8 cross-listed

All11Primary3Cross-lists8
  1. 04

    [Submitted on 1 Jul 2019] (cross-list from hep-ph)

    PDFSense: Mapping the PDF sensitivity of future facilities (HL-LHC, LHeC, and EIC)

    T. J. Hobbs🇺🇸 · Bo-Ting Wang🇺🇸 · Pavel M. Nadolsky🇺🇸 · Fredrick I. Olness🇺🇸

    Particle and nuclear physics are moving toward a new generation of experiments to stress-test the Standard Model (SM), search for novel degrees of freedom, and comprehensively map the internal structure of hadrons. Due to the complex nature of QCD and wide array of past, present, and possible future experiments, measurements taken at these next-generation facilities will inhabit an expansive space of high-energy data. Maximizing the impact of each future collider program will depend on identifying its place within this sprawling landscape. As an initial exploration, we use the recently-developed PDFSense framework to assess the PDF sensitivity of two future high-energy facilities --- the high-luminosity upgrade to the LHC (HL-LHC) and the Large Hadron-electron Collider (LHeC) proposal --- as well as the electron-ion collider (EIC) proposed to map the few-GeV quark-hadron transition region. We report that each of these experimental facilities occupies a unique place in the kinematical parameter space with specialized pulls on particular collinear quantities. As such, there is a clear complementarity among these programs, with an opportunity for each to mutually reinforce and inform the others.

    Comments:
    6 pages, 2 figures; proceedings of XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2019); minor revisions, references added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1907.00988 [pdf]
    PoS(2019)·6 citations
  2. 05

    [Submitted on 1 Jul 2019] (cross-list from hep-ph)

    Neutrino Non-Standard Interactions: A Status Report

    P. S. Bhupal Dev🇺🇸 · K. S. Babu🇺🇸 · Peter B. Denton🇺🇸 · Pedro A. N. Machado🇺🇸 · Carlos A. Argüelles🇺🇸 · Joshua L. Barrow🇺🇸 · Sabya Sachi Chatterjee🇬🇧 · Mu-Chun Chen🇺🇸 · André de Gouvêa🇺🇸 · Bhaskar Dutta🇺🇸 · Dorival Gonçalves🇺🇸 · Tao Han🇺🇸 and 14 other authors

    This report summarizes the present status of neutrino non-standard interactions (NSI). After a brief overview, several aspects of NSIs are discussed, including connection to neutrino mass models, model-building and phenomenology of large NSI with both light and heavy mediators, NSI phenomenology in both short- and long-baseline neutrino oscillation experiments, neutrino cross-sections, complementarity of NSI with other low- and high-energy experiments, fits with neutrino oscillation and scattering data, DUNE sensitivity to NSI, effective field theory of NSI, as well as the relevance of NSI to dark matter and cosmology. We also discuss the open questions and interesting future directions that can be pursued by the community at large. This report is based on talks and discussions during the Neutrino Theory Network NSI workshop held at Washington University in St. Louis from May 29-31, 2019 (https://indico.cern.ch/event/812851/)

    Comments:
    104 pages; minor revision
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1907.00991 [pdf]
    SciPost Phys.Proc.(2019)·265 citations
  3. 06

    [Submitted on 2 Jul 2019] (cross-list from astro-ph.SR)

    makes explosive oxygen burning sensitive to the metallicity of the progenitors of type Ia supernovae

    Eduardo Bravo

    Even though the main nucleosynthetic products of type Ia supernovae belong to the iron-group, intermediate-mass alpha-nuclei (silicon, sulfur, argon, and calcium) stand out in their spectra up to several weeks past maximum brightness. Recent measurements of the abundances of calcium, argon, and sulfur in type Ia supernova remnants have been interpreted in terms of metallicity-dependent oxygen burning, in accordance with previous theoretical predictions. It is known that -rich oxygen burning results from OC followed by efficient C+C fusion reaction, as compared to oxygen consumption by O fusion reactions, but the precise mechanism of dependence on the progenitor metallicity has remained unidentified so far. I show that the chain O(p,)N(,p)C boosts -rich oxygen burning when the proton abundance is large, increasing the synthesis of argon and calcium with respect to sulfur and silicon. For high-metallicity progenitors, the presence of free neutrons leads to a drop in the proton abundance and the above chain is not efficient. Although the rate of O(p,)N can be found in astrophysical reaction rate libraries, its uncertainty is unconstrained. Assuming that all reaction rates other than O(p,)N retain their standard values, an increase by a factor of approximately seven of the O(p,)N rate at temperatures in the order K is enough to explain the whole range of calcium-to-sulfur mass ratios measured in Milky Way and LMC supernova remnants. These same measurements provide a lower limit to the O(p,)N rate in the mentioned temperature range, on the order of a factor of 0.5 with respect to the rate reported in widely used literature tabulations.

    Comments:
    5 pages, 6 figures, accepted for Astronomy & Astrophysics
    Subjects:
    Solar and Stellar Astrophysics (astro-ph.SR); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1907.01158 [pdf]
    Astron.Astrophys.(2019)·3 citations
  4. 07

    [Submitted on 2 Jul 2019] (cross-list from hep-ph)

    1+1 dimensional relativistic magnetohydrodynamics with longitudinal acceleration

    Duan She🇨🇳 · Ze Fang Jiang🇨🇳 · De-fu Hou🇨🇳 · C. B. Yang🇨🇳

    Non-central heavy-ion collisions generate the strongest magnetic field of the order of Gauss due to the electric current produced by the positively charged spectators that travel at nearly the speed of light. Such transient electromagnetic fields may induce various novel effects in the hydrodynamic description of the quark gluon plasma for non-central heavy-ion collisions. We investigate the longitudinal acceleration effects on the 1+1 dimensional relativistic magnetohydrodynamics with transverse magnetic fields. We analyze the proper time evolution of the system energy density. We find that the longitudinal acceleration parameter , magnetic field decay parameter , equation of state , and initial magnetization have nontrivial effects on the evolutions of the system energy density and temperature.

    Comments:
    9 pages, 9 figures, in Revtex
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1907.01250 [pdf]
    PRD(2019)·12 citations
  5. 08

    [Submitted on 2 Jul 2019] (cross-list from astro-ph.HE)

    Gravitational waves from phase transition of NS to QS

    Prasad R🇮🇳 · Ritam Mallick🇮🇳

    In this article, we perform a 2-d simulation of combustion of neutron star (NS) to hybrid star (HS). We assume that a sudden density fluctuation at the center of the NS initiates a shock discontinuity near the center of the star. This shock discontinuity deconfines NM to 2-f QM, initiating combustion of the star. This combustion front propagates from the center to the surface converting NM to 2-f QM. This combustion stops at a radius of inside the star, as at this density the NM is much stable than QM. Beyond although the combustion stops but the shock wave propagates to the surface. We study the gravitational wave signal for such a PT of NS to HS. We find that such PT has unique GW strain of amplitude . These signals last for few tens of and shows small oscillating behaviour. The power spectrum consists of peaks and at fairly high frequency range. The conversion to NS to HS has a unique signature which would help in defining the PT and the fate of the NS.

    Comments:
    13 pages, 13 figures and 2 Tables
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1907.01330 [pdf]
    ApJ(2020)·17 citations
  6. 09

    [Submitted on 2 Jul 2019] (cross-list from hep-ph)

    Differential and total cross sections of high energy proton-proton scattering in holographic QCD

    Akira Watanabe🇨🇳

    The analysis on the high energy proton-proton scattering is presented, focusing on the Regge regime and considering the Pomeron exchange to describe the involved nonperturbative dynamics in the framework of holographic QCD. We combine the Reggeized spin-2 particle propagator and the proton gravitational form factor, which is obtained from the bottom-up AdS/QCD model, and calculate the differential and total cross sections. We explicitly demonstrate the comparison between our calculations and the currently available experimental data including the recent ones measured at TeV by the TOTEM collaboration at the LHC. It is shown that our results are consistent with the data, which implies that the present framework works in the considered TeV scale.

    Comments:
    6 pages, 2 figures, prepared for the proceedings of the XXVII International Workshop on Deep Inelastic Scattering and Related Subjects (DIS2019), 8 - 12 April 2019, Torino, Italy
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1907.01416 [pdf]
    PoS(2019)·3 citations
  7. 10

    [Submitted on 2 Jul 2019] (cross-list from hep-ph)

    Is the X(3872) a bound state ?

    Pablo G. Ortega🇪🇸 · Enrique Ruiz Arriola🇪🇸

    All existing experimental evidence of the bound state nature of the relies on considering its decay products with a finite experimental spectral mass resolution which is typically MeV and much larger than its alleged binding energy, MeV. On the other hand, we have found recently that there is a neat cancellation in the channel for the invariant mass around the threshold between the continuum and bound state contribution. This is very much alike a similar cancellation in the proton-neutron continuum with the deuteron in the channel. Based on comparative fits of experimental cross section deuteron and prompt production in pp collisions data with a finite to a common Tsallis distribution we find a strong argument questioning the bound state nature of the state but also explaining the large observed production rate likely consistent with a half-bound state.

    Comments:
    6 pages, 4 figures, 1 table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1907.01441 [pdf]
    CPC(2019)·11 citations
  8. 11

    [Submitted on 2 Jul 2019] (cross-list from nucl-ex)

    Event-by-Event Multiplicity Correlations in Cf(sf)

    Stefano Marin · Vladimir A. Protopopescu · Ramona Vogt · Matthew J. Marcath · M. Stephan Okar · Michael Y. Hua · Patrick Talou · Patricia F. Schuster · Shaun D. Clarke · Sara A. Pozzi

    Excited nuclear fragments are emitted during nuclear fission. The de-excitation of these fission fragments takes place as sequential emission of neutrons followed by photons. A correlation between neutron and photon multiplicities accompanying fission is thus expected. Fission event generators based on established statistical nuclear physics models predict a negative event-by-event correlation in neutron-photon multiplicity. A survey of published experimental results of an event-by-event covariance between the neutron and photon multiplicities emitted following the spontaneous fission of Cf is presented. Analytic unfolding expressions are developed in this work to determine the bias introduced by background sources, particle misclassification, pulse pileup, and inelastic photon production. The published experimental data are re-analyzed using these unfolding techniques and are found to be in qualitative agreement with the predictions of model-based calculations. In particular, we have concluded that there exists a significant event-by-event neutron-photon emission competition following the spontaneous fission of Cf.

    Comments:
    8pages, 3 figures, 2 table
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1907.01483 [pdf]
    Nucl.Instrum.Meth.A(2020)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE