2,169 research outputs found

    A split SUSY model from SUSY GUT

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    We propose to split the sparticle spectrum from the hierarchy between the GUT scale and the Planck scale. A split supersymmetric model, which gives non-universal gaugino masses, is built with proper high dimensional operators in the framework of SO(10) GUT. Based on a calculation of two-loop beta functions for gauge couplings (taking into account all weak scale threshold corrections), we check the gauge coupling unification and dark matter constraints (relic density and direct detections). We find that our scenario can achieve the gauge coupling unification and satisfy the dark matter constraints in some part of parameter space. We also examine the sensitivity of the future XENON1T experiment and find that the currently allowed parameter space in our scenario can be covered for a neutralino dark matter below about 1.0 TeV.Comment: 16 pages, 3 figure; minor changes, references adde

    Heavy colored SUSY partners from deflected anomaly mediation

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    We propose a deflected anomaly mediation scenario from SUSY QCD which can lead to both positive and negative deflection parameters (there is a smooth transition between these two deflection parameter regions by adjusting certain couplings). Such a scenario can naturally give a SUSY spectrum in which all the colored sparticles are heavy while the sleptons are light. As a result, the discrepancy between the Brookheaven gμ2g_\mu-2 experiment and LHC data can be reconciled in this scenario. We also find that the parameter space for explaining the gμ2g_\mu-2 anomaly at 1σ1\sigma level can be fully covered by the future LUX-ZEPLIN 7.2 Ton experiment.Comment: 16 pages, 6 figure

    Fast estimation of nonlinearities in atomic force microscopy

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    We propose a fast method to reconstruct the curve of tip-surface force v.s. distance in Atomic Force Microscopy (AFM). A precise and fast force curve reconstruction can help improve research in material science, biological science, chemistry, etc. Existing techniques require multiple sinusoids at the input to introduce intermodulation terms, i.e., exponential components at equally spaced frequencies, and the estimation is done by balancing those terms. Instead of using intermodulation terms, our method tries to balance time domain samples. The method is based on the assumption that a discrete model approximates the continuous AFM model well when sampled at high frequency. Least Squares method is used to derive a polynomial approximating the force curve. The new method can make use of samples in the transient process and does not require multiple sinusoids at the input. It has potential benets in taking less testing time, getting more accuracy and acquiring force curves of several materials in one experiment

    A comparative study of dark matter in the MSSM and its singlet extensions: a mini review

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    In this note we briefly review the recent studies of dark matter in the MSSM and its singlet extensions: the NMSSM, the nMSSM, and the general singlet extension. Under the new detection results of CDMS II, XENON, CoGeNT and PAMELA, we find that (i) the latest detection results can exclude a large part of the parameter space which allowed by current collider constraints in these models. The future SuperCDMS and XENON can cover most of the allowed parameter space; (ii) the singlet sector will decouple from the MSSM-like sector in the NMSSM, however, singlet sector makes the nMSSM quite different from the MSSM; (iii) the NMSSM can allow light dark matter at several GeV exists. Light CP-even or CP-odd Higgs boson must be present so as to satisfy the measured dark matter relic density. In case of the presence of a light CP-even Higgs boson, the light neutralino dark matter can explain the CoGeNT and DAMA/LIBRA results; (iv) the general singlet extension of the MSSM gives a perfect explanation for both the relic density and the PAMELA result through the Sommerfeld-enhanced annihilation. Higgs decays in different scenario are also studied.Comment: Major changes. Reference added. To appear in Advances in High Energy Physic