548 research outputs found

    The CPT group of the spin-3/2 field

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    We find out that both the matrix and the operator CPT groups of the spin-3/2 field (with or without mass) are respectively isomorphic to D4⋊Z2D_4\rtimes\mathbb{Z}_2 and Q×Z2Q\times\mathbb{Z}_2. These groups are exactly the same groups as for the Dirac field, though there is no a priori reason why they should coincide.Comment: 9 pages. We are replacing the original version (v1) because there was a mistake in the calculation which led to wrong group

    Branching Ratio and CP-asymmetry for B-> 1^{1}P_{1}gamma decays

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    We calculate the branching ratios for B_{d}^{0}->(b_{1},h_{1})gamma at next-to-leading order (NLO) of alpha_{s} where b_{1} and h_{1} are the corresponding radially excited axial vector mesons of rho and omega respectively. Using the SU(3)symmetry for the form factor, the branching ratio for B_{d}^{0}->(b_{1},h_{1})gamma is expressed in terms of the branching ratio of the B_{d}^{0}-> K_{1}gamma and it is found to be B(B_{d}^{0}->b_{1}gamma)=0.71* 10^{-6} and B(B_{d}^{0}-> h_{1}gamma) =0.74*10^{-6}. We also calculate direct CP asymmetry for these decays and find, in confirmity with the observations made in the literature, that the hard spectator contributions significantely reduces the asymmetry arising from the vertex corrections alone. The value of CP-asymmetry is 10% and is negative like rho and omega in the Standard Model.Comment: 10 pages, 2 figure

    Branching ratio for B -> K_1 gamma decay in next-to-leading order in LEET

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    Branching ratio for B -> K_1 gamma at next-to-leading order of alpha_s has been calculated in Large Energy Effective Theory. By incorporating the higher twist effects in light cone decay amplitude for axial K-meson, it is shown that the form factor is not sensitive to these twists.Comment: 9 postscript figures, text 9 page

    The tip-link antigen, a protein associated with the transduction complex of sensory hair cells, is protocadherin-15

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    Sound and acceleration are detected by hair bundles, mechanosensory structures located at the apical pole of hair cells in the inner ear. The different elements of the hair bundle, the stereocilia and a kinocilium, are interconnected by a variety of link types. One of these links, the tip link, connects the top of a shorter stereocilium with the lateral membrane of an adjacent taller stereocilium and may gate the mechanotransducer channel of the hair cell. Mass spectrometric and Western blot analyses identify the tip-link antigen, a hitherto unidentified antigen specifically associated with the tip and kinocilial links of sensory hair bundles in the inner ear and the ciliary calyx of photoreceptors in the eye, as an avian ortholog of human protocadherin-15, a product of the gene for the deaf/blindness Usher syndrome type 1F/DFNB23 locus. Multiple protocadherin-15 transcripts are shown to be expressed in the mouse inner ear, and these define four major isoform classes, two with entirely novel, previously unidentified cytoplasmic domains. Antibodies to the three cytoplasmic domain-containing isoform classes reveal that each has a different spatiotemporal expression pattern in the developing and mature inner ear. Two isoforms are distributed in a manner compatible for association with the tip-link complex. An isoform located at the tips of stereocilia is sensitive to calcium chelation and proteolysis with subtilisin and reappears at the tips of stereocilia as transduction recovers after the removal of calcium chelators. Protocadherin-15 is therefore associated with the tip-link complex and may be an integral component of this structure and/or required for its formatio

    Hyperon Nonleptonic Weak Decays Revisited

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    We first review the current algebra - PCAC approach to nonleptonic octet baryon 14 weak decay B (\to) (B^{\prime})(\pi) amplitudes. The needed four parameters are independently determined by (\Omega \to \Xi \pi),(\Lambda K) and (\Xi ^{-}\to \Sigma ^{-}\gamma) weak decays in dispersion theory tree order. We also summarize the recent chiral perturbation theory (ChPT) version of the eight independent B (\to) (B^{\prime}\pi) weak (\Delta I) = 1/2 amplitudes containing considerably more than eight low-energy weak constants in one-loop order.Comment: 10 pages, RevTe

    Proving the Low Energy Theorem of Hidden Local Symmetry

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    Based on the Ward-Takahashi identity for the BRS symmetry, we prove to all orders of the loop expansion the low energy theorem of hidden local symmetry for the vector mesons (KSRF (I) relation) in the U(N)LU(N)_{\rm L} ×\times U(N)RU(N)_{\rm R} / U(N)VU(N)_{\rm V} nonlinear chiral Lagrangian.Comment: 12 pages, LaTeX, DPNU-93-01/KUNS-117

    Bi-allelic Variants in METTL5 Cause Autosomal-Recessive Intellectual Disability and Microcephaly

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    Contains fulltext : 208970.pdf (publisher's version ) (Open Access
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