6,768 research outputs found

    Inquiry into examination errors summer 2011 : interim report

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    Linking of errata: current practices in online physical sciences journals

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    Reader awareness of article corrections can be of critical importance in the physical and biomedical sciences. Comparison of errata and corrigenda in online versions of high-impact physical sciences journals across titles and publishers yielded surprising variability. Of 44 online journals surveyed, 14 had no links between original articles and later corrections. When present, hyperlinks between articles and errata showed patterns in presentation style, but lacked consistency. Variability in the presentation, linking, and availability of online errata indicates that practices are not evenly developed across the field. Comparison of finding tools showed excellent coverage of errata by Science Citation Index, lack of indexing in INSPEC, and lack of retrieval with SciFinder Scholar. The development of standards for the linking of original articles to errata is recommended

    Scaling ansatz with texture zeros in linear seesaw

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    We investigate scaling ansatz with texture zeros within the framework of linear seesaw mechanism. In this variant of seesaw mechanism a simplified expression of effective neutrino mass matrix mνm_\nu containing two Dirac type matrices (mDm_D and mDSm_{DS}) and one Majorana type matrix (mRSm_{RS}) is obtained by virtue of neglecting the global U(1)LU(1)_L symmetry breaking term in the mass term of the Lagrangian. Along with the charged lepton mass matrix, the matrix mRSm_{RS} too, is chosen in a diagonal basis whereas a scaling relation is incorporated in mDm_D and mDSm_{DS} with different scale factors. Our goal in this work is to achieve a completely phenomenologically acceptable mνm_\nu generated by combinations of mDm_D and mDSm_{DS} containing least number of independent parameters or maximum number of zeros. At the end of the numerical analysis it is found that number of zeros in any of the constituent Dirac type matrices (mDm_D and mDSm_{DS}) of mνm_\nu cannot be greater than six in order to meet the phenomenological requirements. The hierarchy obtained here is normal and also the values of the two parameters sum mass (∑mi\sum m_i) and ∣mνee∣|m_{\nu_{ee}}| are below the present experimental lower limit.Comment: 18 pages, 10 tables, 1 figure, Accepted for publication in Physics Letters

    Massive vectors and loop observables: the g−2g-2 case

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    We discuss the use of massive vectors for the interpretation of some recent experimental anomalies, with special attention to the muon g−2g-2. We restrict our discussion to the case where the massive vector is embedded into a spontaneously broken gauge symmetry, so that the predictions are not affected by the choice of an arbitrary energy cut-off. Extended gauge symmetries, however, typically impose strong constraints on the mass of the new vector boson and for the muon g−2g-2 they basically rule out, barring the case of abelian gauge extensions, the explanation of the discrepancy in terms of a single vector extension of the standard model. We finally comment on the use of massive vectors for BB-meson decay and di-photon anomalies.Comment: 25 pages, 1 figure. References added, to appear in JHE
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