Fri·Jun 5, 2015Friday·June 5, 2015

1. 01*

   Quantifying truncation errors in effective field theory

   R. J. Furnstahl🇺🇸 · N. Klco🇺🇸 · D. R. Phillips🇺🇸 · S. Wesolowski🇺🇸

   Bayesian procedures designed to quantify truncation errors in perturbative calculations of quantum chromodynamics observables are adapted to expansions in effective field theory (EFT). In the Bayesian approach, such truncation errors are derived from degree-of-belief (DOB) intervals for EFT predictions. Computation of these intervals requires specification of prior probability distributions ("priors") for the expansion coefficients. By encoding expectations about the naturalness of these coefficients, this framework provides a statistical interpretation of the standard EFT procedure where truncation errors are estimated using the order-by-order convergence of the expansion. It also permits exploration of the ways in which such error bars are, and are not, sensitive to assumptions about EFT-coefficient naturalness. We first demonstrate the calculation of Bayesian probability distributions for the EFT truncation error in some representative examples, and then focus on the application of chiral EFT to neutron-proton scattering. Epelbaum, Krebs, and Meißner recently articulated explicit rules for estimating truncation errors in such EFT calculations of few-nucleon-system properties. We find that their basic procedure emerges generically from one class of naturalness priors considered, and that all such priors result in consistent quantitative predictions for 68% DOB intervals. We then explore several methods by which the convergence properties of the EFT for a set of observables may be used to check the statistical consistency of the EFT expansion parameter.

   ↳ nucl-thhep-phnucl-exphysics.data-anPRC(2015)·319 citations
2. 02*

   Precision Muon Physics

   T.P. Gorringe🇺🇸 · D.W. Hertzog🇺🇸

   The muon is playing a unique role in sub-atomic physics. Studies of muon decay both determine the overall strength and establish the chiral structure of weak interactions, as well as setting extraordinary limits on charged-lepton-flavor-violating processes. Measurements of the muon's anomalous magnetic moment offer singular sensitivity to the completeness of the standard model and the predictions of many speculative theories. Spectroscopy of muonium and muonic atoms gives unmatched determinations of fundamental quantities including the magnetic moment ratio ${\mu }_{\mu }/{\mu }_p$, lepton mass ratio $m_{\mu }/m_e$, and proton charge radius $r_p$. Also, muon capture experiments are exploring elusive features of weak interactions involving nucleons and nuclei. We will review the experimental landscape of contemporary high-precision and high-sensitivity experiments with muons. One focus is the novel methods and ingenious techniques that achieve such precision and sensitivity in recent, present, and planned experiments. Another focus is the uncommonly broad and topical range of questions in atomic, nuclear and particle physics that such experiments explore.

   ↳ hep-exnucl-exphysics.ins-detPPNP(2015)·115 citations
3. 03*

   Test of a Multilayer Dose-Verification Gaseous Detector with Raster Scan Mode Proton Beams

   Kyong Sei Lee🇰🇷 · Sung Hwan Ahn🇺🇸 · Youngyih Han🇺🇸 · Byungsik Hong🇰🇷 · Minho Kang · Sang Yeol Kim · Seunkyung Lee🇰🇷 · Sung Keun Park🇺🇸

   A multilayer gaseous detector has been developed for the fast dose-verification measurements of raster-scan-mode therapeutic beams in particle therapy.

   ↳ physics.ins-detnucl-ex0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.