1,361 research outputs found

    Leptonic anomalous gauge couplings detection on electron positron colliders

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    We studied the dimension-6 leptonic anomalous gauge couplings in the formulation of linearly realized gauge symmetry effective Lagrangian and investigated the constraints on these anomalous couplings from the existed experimental data including LEP2 and WW/ZZ boson decay. Some bounds of O(0.1−10)TeV−2O(0.1-10){\rm TeV}^{-2} on four relevant anomalous couplings are given by the Z factories. We studied the sensitivity of testing the leptonic anomalous couplings via the process e+e−→W+W−e^+e^-\rightarrow W^+W^- at future e+e−e^+e^- linear colliders. We discussed different sensitivities to anomalous couplings at polarized and unpolarized e+e−e^+e^- colliders, respectively, with 500 GeV and 1 TeV collision energy. Our results show that the a 500 GeV ILC can provide a test of the anomalous couplings, with the same relative uncertainty of cross section measurement, of O(0.1−1)TeV−2O(0.1-1){\rm TeV}^{-2}, and a 1 TeV ILC can test the anomalous couplings of O(0.01−0.1)TeV−2O(0.01-0.1){\rm TeV}^{-2}.Comment: 18 pages, 9 figures. feynman rules of eeWWeeWW and vvWWvvWW vertex corrected; correspongding results (of f7f_7 and f24f_24) revise

    Categorizing resonances X(1835), X(2120) and X(2370) in the pseudoscalar meson family

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    Inspired by the newly observed three resonances X(1835), X(2120) and X(2370), in this work we systematically study the two-body strong decays and double pion decays of η(1295)/η(1475)\eta(1295)/\eta(1475), η(1760)/X(1835)\eta(1760)/X(1835) and X(2120)/X(2370)X(2120)/X(2370) by categorizing η(1295)/η(1475)\eta(1295)/\eta(1475), η(1760)/X(1835)\eta(1760)/X(1835), X(2120) and X(2370) as the radial excitations of η(548)/η′(958)\eta(548)/\eta^\prime(958). Our numerical results indicate the followings: (1) The obtained theoretical strong decay widths of three pseudoscalar states η(1295)\eta(1295), η(1475)\eta(1475) and η(1760)\eta(1760) are consistent with the experimental measurements; (2) X(1835) could be the second radial excitation of η′(958)\eta^\prime(958); (3) X(2120) and X(2370) can be explained as the third and fourth radial excitations of η(548)/η′(958)\eta(548)/\eta^\prime(958), respectively.Comment: 16 pages, 15 figures, 3 tables. Accepted for publication in Phys. Rev.

    Research status quo and prospection of mechanical characteristics of rock under high temperature and high pressure

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    AbstractThe mechanical features of rock have significant relevance to temperature. The problems related to temperature are becoming a hot geotechnical research field. The paper summarized the rheological characteristics, failure, instability modes at high temperature and high pressure, rules of elastic modulus and thermal expand coefficient changing with temperature, as well as the thermal-induced failure characteristics of rock affected by temperature and pressure, and finally prospects the research directions of high temperature rock mechanics

    In-situ cosmogenic <sup>36</sup>Cl denudation rates of carbonates in Guizhou karst area

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    This study quantifies surface denudation of carbonate rocks by the first application of in-situ cosmogenic &lt;sup&gt;36&lt;/sup&gt;Cl in China. Concentrations of natural Cl and in-situ cosmogenic &lt;sup&gt;36&lt;/sup&gt;Cl in bare carbonates from Guizhou karst areas were measured with isotope dilution by accelerator mass spectrometer. The Cl concentration varied from 16 to 206 ppm. The &lt;sup&gt;36&lt;/sup&gt;Cl concentrations were in range of (0.8–2.4)×106 atom g−1, resulting in total denudation rates of 20–50 mm ka−1 that averaged over a 104–105 a timescale. The &lt;sup&gt;36&lt;/sup&gt;Cl-denudation rates showed roughly a negative correlation with the local mean temperature. This preliminary observation may suggest the variations of proportions of chemical weathering and physical erosion in denudation process, depending upon local climatic conditions
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