2,614 research outputs found

    Spin transfer and polarization of antihyperons in lepton induced reactions

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    We study the polarization of antihyperon in lepton induced reactions such as e+eβˆ’β†’HΛ‰+Xe^+e^-\to\bar H+X and l+pβ†’lβ€²+HΛ‰+Xl+p\to l'+\bar H+X with polarized beams using different models for spin transfer in high energy fragmentation processes. We compare the results with the available data and those for hyperons. We make predictions for future experiments.Comment: 31 pages, 6 figures. submitted to Phys. Rev. D. content changed, references adde

    Probing new physics with polarization components of the tau lepton in quasielastic eβˆ’pβ†’Ξ›cΟ„βˆ’e^- p \to \Lambda_c \tau^- scattering process

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    Kinematics restrict the ability of rare charm decays to explore the charged Lepton Flavor Violation processes mediated by the quark-level cβ†’uβ„“Ο„c\to u \ell \tau transition. To fill the gap, we propose exploring new physics (NP) through the quasielastic scattering process eβˆ’pβ†’Ο„βˆ’Ξ›ce^-p\to \tau^-\Lambda_c and the polarization of the Ο„\tau lepton. As analyzing modes for the Ο„\tau polarization, we consider the decays Ο„βˆ’β†’Ο€βˆ’Ξ½Ο„\tau^-\to \pi^-\nu_{\tau}, Ο„βˆ’β†’Οβˆ’Ξ½Ο„\tau^-\to \rho^-\nu_{\tau}, and Ο„βˆ’β†’β„“βˆ’Ξ½Λ‰β„“Ξ½Ο„\tau^- \to \ell^-\bar{\nu}_{\ell}\nu_{\tau}, and show that the Ο„\tau polarization components can be extracted from analyzing the kinematics of the Ο„\tau visible decay products. In the framework of a general low-energy effective Lagrangian, we then perform a detailed analysis of the polarization components in various aspects and scrutinize possible NP signals. With one upcoming experimental setup, we finally demonstrate promising event rate can be expected for the cascade process and, even in the worst-case scenario -- no signals is observed at all -- it can still provide a competitive potential for constraining the NP, compared with those from the high-pTp_T dilepton invariant mass tails at high-energy colliders.Comment: 20 pages, 4 figures, 5 table

    (4-Bromo-3,5-dimethyl-1H-pyrazol-1-yl)(2,6-difluoroΒ­phenΒ­yl)methanone

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    There are two molΒ­ecules in the asymmetric unit of the title compound, C12H9BrF2N2O. They have very similar conformations: the dihedral angles between their pyrazole and benzene ring systems are 78.4β€…(3) and 78.6β€…(4)Β°. In the crystal, weak aromatic π–π stacking [centroid–centroid separation = 3.696β€…(5)β€…Γ…] helps to establish the packing
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