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Nuclear Theory·nucl-th

Thursday·April 28, 2016

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    [Submitted on 25 Apr 2016] (cross-list from hep-ph)

    Protophobic Fifth Force Interpretation of the Observed Anomaly in Be Nuclear Transitions

    Jonathan L. Feng🇺🇸 · Bartosz Fornal🇺🇸 · Iftah Galon🇺🇸 · Susan Gardner🇺🇸 · Jordan Smolinsky🇺🇸 · Tim M. P. Tait🇺🇸 · Philip Tanedo🇺🇸

    Recently a 6.8 anomaly has been reported in the opening angle and invariant mass distributions of pairs produced in nuclear transitions. The data are explained by a 17 MeV vector gauge boson that is produced in the decay of an excited state to the ground state, , and then decays through . The boson mediates a fifth force with a characteristic range of 12 fm and has milli-charged couplings to up and down quarks and electrons, and a proton coupling that is suppressed relative to neutrons. The protophobic boson may also alleviate the current 3.6 discrepancy between the predicted and measured values of the muon's anomalous magnetic moment.

    Comments:
    6 pages, 2 figures; v2: published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1604.07411 [pdf]
    PRL(2016)·301 citations
  2. 07

    [Submitted on 27 Apr 2016] (cross-list from physics.ed-ph)

    Helicity and nuclear decay correlations

    Ran Hong🇺🇸 · Matthew G. Sternberg🇺🇸 · Alejandro García🇺🇸

    We present simple derivations of nuclear -decay correlations with an emphasis on the special role of helicity. This provides a good opportunity to teach students about helicity and chirality in particle physics through exercises using simple aspects of quantum mechanics. In addition, this paper serves as an introduction to nuclear -decay correlations from both a theoretical and experimental vantage. This article can be used to introduce students to ongoing experiments searching for hints of new physics in the low-energy precision frontier.

    Subjects:
    physics.ed-ph (physics.ed-ph); Nuclear Theory (nucl-th)
    arXiv:
    1604.07913 [pdf]
    Am.J.Phys.(2017)·6 citations
  3. 08

    [Submitted on 27 Apr 2016] (cross-list from hep-lat)

    An implementation of hybrid parallel CUDA code for the hyperonic nuclear forces

    Hidekatsu Nemura · for HAL QCD Collaboration

    We present our recent effort to develop a GPGPU program to calculate 52 channels of the Nambu-Bethe-Salpeter (NBS) wave functions in order to study the baryon interactions, from nucleon-nucleon to , from lattice QCD. We adopt CUDA programming to perform the multi-GPU execution on a hybrid parallel programming with MPI and OpenMP. Effective baryon block algorithm is briefly outlined, which calculates efficaciously a large number of NBS wave functions at a time, and three CUDA kernel programs are implemented to materialize the effective baryon block algorithm using GPUs on the single-program multiple-data (SPMD) programming model. In order to parallelize multiple GPUs, we take both two approaches by dividing the time dimension and by dividing the spatial dimensions. Performances are measured using HA-PACS supercomputer in University of Tsukuba, which includes NVIDIA M2090 and NVIDIA K20X GPUs. Strong scaling and weak scaling measured by using both M2090 and K20X GPUs are presented. We find distinct difference between the M2090 and the K20X in the sustained performance measurement of particular kernel executions which utilize the cudaStream objects.

    Comments:
    Talk given at the 33rd International Symposium on Lattice Field Theory (Lattice 2015), 14-18 July 2015, Kobe, Japan, 7 pages, 2 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1604.07983 [pdf]
    PoS(2016)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE