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DPG spring meeting of the nuclear physics sections; Groningen (Netherlands); 23-27 Mar 1987; Published in summary form only.
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Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195;
; CODEN VDPEA; v. 22(4); p. F-2.5

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[en] We have measured the mean lifetime tau of the free neutron by counting decay protons stored in an electromagnetic trap. Neutron density determination was by activation of calibrated boron foils. The result, based on five independent measurements for various experimental conditions, is tau = 937 +- 18 s. (orig.)
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Journal Article
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Phys. Lett., B; ISSN 0370-2693;
; v. 92(3/4); p. 274-278

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AbstractAbstract
[en] At this stage of the LHC (Large Hadron Collider) program, the prospect for a new physics signal in the very rare K → Kνν-bar decays may be dented, but remains well alive thanks to their intrinsic qualities. First, these decays are among the cleanest observables in the quark flavor sector. When combined with their terrible suppression in the SM (Standard Model), they thus offer uniquely sensitive probes. Second, the LHC capabilities are not ideal for all kinds of new physics, even below the TeV scale. For example, rather elusive scenarios like natural-SUSY-like hierarchical spectrum, baryon number violation, or new very light but very weakly interacting particles may well induce deviations in rare K decays. Even though experimentalists should brace themselves for tiny deviations, these modes thus have a clear role to play in the LHC era. (author)
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Sep 2014; 25 p; FPCP 2014: Flavor Physics and CP Violation; Marseille (France); 26-30 May 2014; 61 refs.; Available in arXiv (1409.6162v1) and also from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS website for current contact and E-mail addresses: http://www.iaea.org/INIS/contacts/
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Miscellaneous
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[en] A long distance contribution to the amplitude for K+→π+νν(bar sign) is calculated. Its magnitude, comparable to that of other long distance effects, is three orders of magnitude smaller than the short distance effects, but the techniques involved may have other applications. (c) 2000 The American Physical Society
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Journal Article
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Numerical Data
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Ehlers, M.
Vienna Univ. (Austria). Formal- und Naturwissenschaftliche Fakultaet1991
Vienna Univ. (Austria). Formal- und Naturwissenschaftliche Fakultaet1991
AbstractAbstract
[en] In this work a nonrelativistic model for hadronic matrix elements of the charged current is derived. First the stability of mesons made of heavy quarks is described. Then some general qualitative remarks on semileptonic hadron decays follow. After fixing the parametrisation of the form factors numerical bounds for certain semileptonic width ratios of pseudoscalar mesons are given. Subsequently, from the assumption of a local duality, form factors for weakly bound mesons are derived. Then the dependence of the form factors on the transfered momentum is considered. After these considerations a nonrelativistic model for hadronic matrix elements of the charged weak current between two (S-state) hadrons (mesons or baryons) is developed, which is symmetric between the two hadrons in the static approximation and depends on the effective spectator masses. For mesons the results are similar to those of other nonrelativistic models. For baryons the method is a lot less elegant than for mesons, since the baryon spinor cannot usefully be split up into a sum of quark spinors. (author)
Original Title
Eigenschaften von Teilchen mit schweren Quarks
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Apr 1991; 50 p; Available from the Vienna University, Dr.Karl Lueger-Ring 1, A-1010 Vienna, Austria; Ref.Nr. D 27.150.; Thesis (Dr. rer.nat.).
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Miscellaneous
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Thesis/Dissertation
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Brown, R.M.
Proceedings of HEP83. International Europhysics conference on high energy physics, Brighton (UK), 20-27 July, 1983
Proceedings of HEP83. International Europhysics conference on high energy physics, Brighton (UK), 20-27 July, 1983
AbstractAbstract
[en] Five different hyperon semileptonic decays have been made by the WA2 experiment. The results are summarized. The WA2 collaboration have performed a Cabibbo fit using only one datum not from the WA2 experiment. The fit gives a Λ2/df of 4.5/5. Other fits are mentioned. (U.K.)
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Guy, J. (Rutherford Appleton Lab., Chilton (UK)); Costain, C. (eds.); 937 p; ISBN 0 902376 42 X;
; nd; p. 256-258; Rutherford Appleton Laboratory; Chilton (UK); HEP83. International Europhysics conference on high energy physics; Brighton (UK); 20-27 Jul 1983

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Book
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[en] We establish two theorems that show that it is not possible to uniquely determine experimentally all of the relevant form factors involved in hyperon semileptonic decays, when an electron or positron is emitted and the hyperons are unpolarized. (orig.)
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Journal Article
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Phys. Lett., B; ISSN 0370-2693;
; v. 120(1-3); p. 214-216

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Hamilton, B.K.
SLAC National Accelerator Laboratory (United States). Funding organisation: US Department of Energy (United States)
arXiv e-print [ PDF ]2012
SLAC National Accelerator Laboratory (United States). Funding organisation: US Department of Energy (United States)
arXiv e-print [ PDF ]2012
AbstractAbstract
[en] In this note, recent results of studies of semileptonic B meson decays from BABAR are discussed and preliminary results given. In particular, a recent measurement of Β(B → D(*)τν) and the ratio Β(B → D(*)τν)/Β(B → D(*)(ell)ν) is presented. For the D* mode, a branching fraction of 1.79 ± 0.13(stat) ± 0.17(syst) is found, with a ratio of 0.325 ± 0.023(stat) ± 0.027(syst). For the D mode, the results are 1.04 ± 0.12(stat) ± 0.14(syst) and 0.456 ± 0.053(stat) ± 0.056(syst), respectively. In addition, a study of Bs production and semileptonic decays using data collected in a center-of-mass energy region above the Υ(4S) resonance is discussed. The semileptonic branching fraction Β(Bs → (ell)νX) is measured to be 9.9-2.1+2.6(stat)-2.0+1.3(syst).
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2 Apr 2012; 8 p; DPF 2011: Meeting of the Division of Particles and Fields of American Physical Society; Providence, RI (United States); 8-13 Aug 2011; ARXIV:1110.2141; AC02-76SF00515; Available from http://www.slac.stanford.edu/cgi-wrap/getdoc/slac-pub-14840.pdf; PURL: https://www.osti.gov/servlets/purl/1038009/
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AbstractAbstract
[en] We present the status of the data analysis of the recent measurement of the proton asymmetry in neutron beta decay with Perkeo III. This first direct measurement using a pulsed neutron beam and a proton retardation system will improve the first indirect measurement of the proton asymmetry, which has been performed with Perkeo II. Measuring the proton asymmetry allows searches for physics beyond axialvector and vector couplings of the Standard Model when combined with measurements of other correlation coefficients of neutron beta decay.
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2018 DPG Spring meeting with the division of physics of hadrons and nuclei and the working group young DPG; DPG-Fruehjahrstagung 2018 des Fachverbands Physik der Hadronen und Kerne und des Arbeitskreises Junge DPG; Bochum (Germany); 26 Feb - 2 Mar 2018; Available from http://www.dpg-verhandlungen.de; Session: HK 11.3 Mo 17:15; No further information available; Also available as printed version: Verhandlungen der Deutschen Physikalischen Gesellschaft v. 53(1)
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Journal Article
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Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195;
; CODEN VDPEAZ; (Bochum 2018 issue); [1 p.]

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AbstractAbstract
[en] We show prospects for research of invisible decays of B meson in a sample of about 470 millions BB pairs recorded with the BABAR detector at the SLAC PEP-II B factory. The Standard Model predictions for a B decay with completely invisible final products (or with a single photon as detectable particle) are far from the current experimental sensitivities but several New Physics Models predict significant enhancements on the branching ratio of these decays. The analysis technique consists in the reconstruction of a semileptonic B decay on one side and in the search of missing energy or missing energy plus one photon in the recoil. We will describe the search techniques and provide the expected sensitivities for these decays.
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IFAE 2011: Incontri di fisica delle Alte Energie; Perugia (Italy); 27-29 Apr 2011
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Journal Article
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Nuovo Cimento. C (Print); ISSN 2037-4909;
; v. 34(6); p. 137-138

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