PaperPanorama
FAQ

Nuclear Theory·nucl-th

Tuesday·June 23, 2020

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 06

    [Submitted on 19 Jun 2020] (cross-list from hep-ph)

    Drell-Yan Resummation of Fiducial Power Corrections at NLL

    Markus A. Ebert🇺🇸 · Johannes K. L. Michel🇩🇪 · Iain W. Stewart🇺🇸 · Frank J. Tackmann🇩🇪

    We consider Drell-Yan production at small . Experimental measurements require fiducial cuts on the leptonic state , which introduce enhanced, linear power corrections in . We show that they can be unambiguously predicted from factorization, and resummed to the same order as the leading-power contribution. We thus obtain predictions for the fiducial spectrum to N3LL and next-to-leading-power in . Matching to full NNLO (), we find that the linear power corrections are indeed the dominant ones, and the remaining fixed-order corrections become almost negligible below GeV. We also discuss the implications for more complicated observables, and provide predictions for the fiducial spectrum at N3LL+NNLO. We find excellent agreement with ATLAS and CMS measurements of and . We also consider the spectrum. We show that it develops leptonic power corrections in , which diverge near the Jacobian peak and must be kept to all powers to obtain a meaningful result there. Doing so, we obtain for the first time an analytically resummed result for the spectrum around the Jacobian peak at N3LL+NNLO. Our method is based on performing a complete tensor decomposition for hadronic and leptonic tensors. In practice this is equivalent to often-used recoil prescriptions, for which our results now provide rigorous, formal justification. Our tensor decomposition yields nine Lorentz-scalar hadronic structure functions, which directly map onto the commonly used angular coefficients, but also holds for arbitrary leptonic final states. In particular, for suitably defined Born-projected leptons it still yields a LO-like angular decomposition even when including QED final-state radiation. We also discuss the application to subtractions.

    Comments:
    81 pages + appendices, beautiful figures [abstract abridged]; v2: more beautiful figures (illustration of Born lepton projection, comparisons to normalized CMS spectra); v3: journal version (added figure with uncertainty breakdown)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2006.11382 [pdf]
    JHEP(2021)·146 citations
  2. 07

    [Submitted on 21 Jun 2020] (cross-list from hep-ph)

    Assessing the accuracy of the GENIE event generator with electron-scattering data

    Artur M. Ankowski🇺🇸 · Alexander Friedland🇺🇸

    Precision neutrino oscillation experiments of the future---of which DUNE is a prime example---require reliable event generator tools. The 1--4 GeV energy regime, in which DUNE will operate, is marked by the transition from the low-energy nuclear physics domain to that of perturbative QCD, resulting in rich and highly complex physics. Given this complexity, it is important to establish a validation procedure capable of disentangling the physical processes and testing each of them individually. Here, we demonstrate the utility of this approach by benchmarking the GENIE generator, currently used by all Fermilab-based experiments, against a broad set of inclusive electron-scattering data. This comparison takes advantage of the fact that, while electron-nucleus and neutrino-nucleus processes share a lot of common physics, electron scattering gives one access to precisely known beam energies and scattering kinematics. Exploring the kinematic parameter range relevant to DUNE in this manner, we observe patterns of large discrepancies between the generator and data. These discrepancies are most prominent in the pion-producing regimes and are present not only in medium-sized nuclei, including argon, but also in deuterium and hydrogen targets, indicating mismodeled hadronic physics. Several directions for possible improvement are discussed.

    Comments:
    22 pages, 20 figures, matches the published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2006.11944 [pdf]
    PRD(2020)·32 citations
  3. 08

    [Submitted on 19 Jun 2020] (cross-list from physics.med-ph)

    Modeling Nuclear Reactions for PET/MRI MultiModal Imaging: the innovative use of 52gMn

    A. Colombi · F. Barbaro · L. Canton · M.P. Carante · A. Fontana

    MultiModal Imaging is an innovative technique that consists in the combination of diagnostic exams based on different physical processes, to obtain a unique image with more detailed clinical information. The possibility of a simultaneous use of PET and MRI could be achieved by using a particular radioisotope: 52gMn. The main route to produce this isotope is the reaction 52Cr(p,n)52gMn which is theoretically investigated in this study by means of three nuclear reaction codes. An analysis of the cross sections and a computation of the production rates and time evolution of the produced radioisotopes are performed, to identify the optimal production parameters. The procedure described for this reaction has a general validity and is applied also to other reactions, such as 52Cr(d,2n)52gMn and natV(alpha,x)52gMn.

    Comments:
    2 pages, to be published in the 2020 Annual Report (LNL-INFN)
    Subjects:
    physics.med-ph (physics.med-ph); Nuclear Theory (nucl-th)
    arXiv:
    2006.12168 [pdf]
    0 citations
  4. 09

    [Submitted on 22 Jun 2020] (cross-list from hep-ph)

    -dependence of light nuclei and nucleosynthesis

    Dean Lee🇺🇸 · Ulf-G. Meißner🇩🇪 · Keith A. Olive🇺🇸 · Mikhail Shifman🇺🇸 · Thomas Vonk🇩🇪

    We investigate the impact of the QCD vacuum at nonzero on the properties of light nuclei, Big Bang nucleosynthesis, and stellar nucleosynthesis. Our analysis starts with a calculation of the -dependence of the neutron-proton mass difference and neutron decay using chiral perturbation theory. We then discuss the -dependence of the nucleon-nucleon interaction using a one-boson-exchange model and compute the properties of the two-nucleon system. Using the universal properties of four-component fermions at large scattering length, we then deduce the binding energies of the three-nucleon and four-nucleon systems. Based on these results, we discuss the implications for primordial abundances of light nuclei, the production of nuclei in stellar environments, and implications for an anthropic view of the universe.

    Comments:
    20 pages, 9 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2006.12321 [pdf]
    PRResearch(2020)·39 citations
  5. 10

    [Submitted on 22 Jun 2020] (cross-list from nucl-ex)

    Study of proton capture resonant state of ^{15}O at 7556 keV

    Sathi Sharma🇮🇳 · Arkabrata Gupta🇮🇳 · M. Roy Chowdhury🇮🇳 · A. Mandal🇮🇳 · A. Bisoi🇮🇳 · V. Nanal🇮🇳 · L. C. Tribedi🇮🇳 · M. Saha Sarkar🇮🇳

    The slowest reaction in the CNO cycle 14N(p, gamma)15O has been studied by populating the E^lab_p =278 keV (E^r_c.m.=259 keV) proton capture resonant state of ^{15}O at 7556 keV. The strength of the resonance has been determined from the experimental data. The level lifetime of the sub-threshold resonant state at Ex=6792 keV, as well as the lifetimes of the 5181 keV and 6172 keV states, have been measured using the Doppler shift attenuation method (DSAM). The structural properties of the nucleus ^{15}O, such as, the level energies, transition strengths, level lifetimes, and spectroscopic factors, have been calculated theoretically by using the large basis shell model, which agrees reasonably well with the present as well as the previous experimental data.

    Comments:
    10 pages, 9 figures, Accepted for publication in Physical Review C
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2006.12371 [pdf]
    PRC(2020)·8 citations
  6. 11

    [Submitted on 22 Jun 2020] (cross-list from hep-ph)

    Fluctuation-induced higher-derivative couplings and infrared dynamics of the Quark-Meson-Diquark Model

    Niklas Cichutek🇩🇪 · Florian Divotgey🇩🇪 · Jürgen Eser🇩🇪

    In a qualitative study, the low-energy properties of the -symmetric Quark-Meson-Diquark Model as an effective model for two-color Quantum Chromodynamics are investigated within the Functional Renormalization Group (FRG) approach. In particular, we compute the infrared scaling behavior of fluctuation-induced higher-derivative couplings of the linear Quark-Meson-Diquark Model and map the resulting renormalized effective action onto its nonlinear counterpart. The higher-derivative couplings of the nonlinear model, which we identify as the low-energy couplings of the Quark-Meson-Diquark Model, are therefore entirely determined by the FRG flow of their linear equivalents. This grants full access to their scaling behavior and provides insights into conceptual aspects of purely bosonic effective models, as they are treated within the FRG. In this way, the presented work is understood as an immediate extension of our recent advances in the -symmetric Quark-Meson Model beyond common FRG approximations.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2006.12473 [pdf]
    PRD(2020)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE