13,296 research outputs found
Generalized CP and Δ(96) family symmetry
No full textWe perform a comprehensive study of the family symmetry combined with the generalised CP symmetry . We investigate the lepton mixing parameters which can be obtained from the original symmetry breaking to different remnant symmetries in the neutrino and charged lepton sectors, namely and subgroups in the neutrino and the charged lepton sector respectively, and the remnant CP symmetries from the breaking of are and , respectively, where all cases correspond to a preserved symmetry smaller than the full Klein symmetry, as in the semi-direct approach, leading to predictions which depend on a single undetermined real parameter, which may be fitted to the reactor angle for example. We discuss 26 possible cases, including a global determination of the best fit parameters and the correlations between mixing parameters, in each case
Generalized CP and delta(3n2) family symmetry for semidirect predictions of the PMNS matrix
No full textThe generalized CP transformations can only be consistently defined in the context of ?(3n2) lepton symmetry if a certain subset of irreducible representations are present in a model. We perform a comprehensive analysis of the possible automorphisms and the corresponding CP transformations of the ?(3n2) group. It is sufficient to only consider three automorphisms if n is not divisible by 3 while an additional eight types of CP transformations could be imposed for the case of n divisible by 3. We study the lepton mixing patterns which can be derived from the ?(3n2) family symmetry and generalized CP in the semidirect approach. The PMNS matrix is determined to be the trimaximal pattern for all the possible CP transformations, and it can only take two distinct forms
Generalised CP and Δ(6n 2) family symmetry in semi-direct models of leptons
No full textWe perform a detailed analysis of family symmetry combined with a generalised CP symmetry in the lepton sector, breaking to different remnant symmetries in the neutrino and in the charged lepton sector, together with different remnant CP symmetries in each sector. We discuss the resulting mass and mixing predictions for with G_{l}=K_4,Z_p,p>2 and with . All cases correspond to the preserved symmetry smaller than the full Klein symmetry, as in the semi-direct approach, leading to predictions which depend on a single undetermined real parameter, which mainly determines the reactor angle. We focus on five phenomenologically allowed cases for which we present the resulting predictions for the PMNS parameters as a function of , as well as the predictions for neutrinoless double beta decay
A new species of Choristoneura Lederer, with a key to the species from China (Lepidoptera: Tortricidae: Tortricinae)
No full textWang, Xin-Pu, Yang, Gui-Jun (2008): A new species of Choristoneura Lederer, with a key to the species from China (Lepidoptera: Tortricidae: Tortricinae). Zootaxa 1944 (1): 66-68, DOI: 10.11646/zootaxa.1944.1.4, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.1944.1.
Supplemental Material - Comparison Between Femoral Neck Systems and Cannulated Cancellous Screws in Treating Femoral Neck Fractures: A Meta-Analysis
No full textSupplemental Material for Comparison Between Femoral Neck Systems and Cannulated Cancellous Screws in Treating Femoral Neck Fractures: A Meta-Analysis by Peng Tian, Lan Kuang, Zhi-jun Li, Gui-jun Xu, and Xin Fu in Geriatric Orthopaedic Surgery & Rehabilitation</p
Leptogenesis and residual CP symmetry
No full textWe discuss flavour dependent leptogenesis in the framework of lepton flavour models based on discrete flavour and CP symmetries applied to the type-I seesaw model. Working in the flavour basis, we analyse the case of two general residual CP symmetries in the neutrino sector, which corresponds to all possible semi-direct models based on a preserved Z 2 in the neutrino sector, together with a CP symmetry, which constrains the PMNS matrix up to a single free parameter which may be fixed by the reactor angle. We systematically study and classify this case for all possible residual CP symmetries, and show that the R-matrix is tightly constrained up to a single free parameter, with only certain forms being consistent with successful leptogenesis, leading to possible connections between leptogenesis and PMNS parameters. The formalism is completely general in the sense that the two residual CP symmetries could result from any high energy discrete flavour theory which respects any CP symmetry. As a simple example, we apply the formalism to a high energy S 4 flavour symmetry with a generalized CP symmetry, broken to two residual CP symmetries in the neutrino sector, recovering familiar results for PMNS predictions, together with new results for flavour dependent leptogenesis
Golden Littlest Seesaw
No full textWe propose and analyse a new class of Littlest Seesaw models, with two right-handed neutrinos in their diagonal mass basis, based on preserving the first column of the Golden Ratio mixing matrix. We perform an exhaustive analysis of all possible remnant symmetries of the group A5 which can be used to enforce various vacuum alignments for the flavon controlling solar mixing, for two simple cases of the atmospheric flavon vacuum alignment. The solar and atmospheric flavon vacuum alignments are enforced by different remnant symmetries. We examine the phenomenological viability of each of the possible Littlest Seesaw alignments in A5, which preserve the first column of the Golden ratio mixing matrix, using figures and extensive tables of benchmark points and comparing our predictions to a recent global analysis of neutrino data. A benchmark model is constructed based on A5ÃZ6ÃZ5ÃZ5â²
Tri-direct CP in the littlest seesaw playground
No full textWe discuss spontaneously broken CP symmetry in two right-handed neutrino models based on the idea of having a different residual flavour symmetry, together with a different residual CP symmetry, associated with each of the two right-handed neutrinos. The charged lepton sector also has a different residual flavour symmetry. In such a tri-direct CP approach, we show that the combination of the three residual flavour and two residual CP symmetries provides a new way of fixing the parameters. To illustrate the approach, we revisit the Littlest Seesaw (LSS) model based on S4 and then propose new variants which have not so far appeared in the literature, with different predictions for each variant. We analyse numerically the predictions of the new variants, and then propose an explicit model which can realise one of the successful benchmark points, based on the atmospheric flavon vacuum alignment (1, ω2, ω) and the solar flavon vacuum alignment (1, −7/2, −7/2).</p
The secondary stress at the details of orthotropic bridge decks induced by thermal gradient under solar radiation
No full textTo investigate the secondary stress of orthotropic steel decks (OSD) induced by thermal gradient in steel box girders, the temperature field of the steel box girder of a self-anchored suspension bridge is measured under high environmental temperature and strong solar radiation. The vertical temperature gradient is fitted based on the measured maximum temperature difference between the roof and the floor. After establishing the sectional box girder model in ANSYS with the measured temperature applied on the box-girder surface, the temperature field in the sectional model is obtained. The temperature results on the floor beam agree well with the measured temperature, which validate the thermal analysis. Based on the simulated 24 h temperature field, the thermal stress field in the sectional box girder is first analyzed. Refined stress results are obtained based on a sub-model technology. The thermal stress time histories are determined at the four details around rib-to-floor beam (RF) connection and the cutout detail. It is found that, under strong solar radiation and high environmental temperature, the transverse temperature difference in the steel-deck box girder is not apparent, while the vertical thermal gradient is significant and can be fitted as a four-broken-line function with the maximum temperature difference lower than that of the Eurocode. Significant stress concentration appears at the details of the OSD, particularly at the cutout detail. The cutout detail will be fatigue-free if the thermal stress range resulting from the vertical temperature under solar radiation is considered, or if the stress range resulting from the truck loading is considered. The stress range at the cutout detail, which is jointly produced by the thermal effect of the vertical temperature and by the truck loading, is larger than the constant-amplitude fatigue limit and may contribute to the fatigue crack at the cutout detail
Generalised CP and A4 family symmetry
No full textWe perform a comprehensive study of family symmetry models based on A4 combined with the generalised CP symmetry H CP. We investigate the lepton mixing parameters which can be obtained from the original symmetry A4 ? H CP breaking to different remnant symmetries in the neutrino and charged lepton sectors. We find that only one case is phenomenologically viable, namely G?CP?ZS2×H?CP in the neutrino sector and GlCP?ZT3?HlCP in the charged lepton sector, leading to the prediction of no CP violation, namely ? CP and the Majorana phases ? 21 and ? 31 are all equal to either zero or ?. We then propose an effective supersymmetric model based on the symmetry A4 ? H CP in which trimaximal lepton mixing is predicted together with either zero CP violation or ? CP ? ±?/2 with non-trivial Majorana phases. An ultraviolet completion of the effective model yields a neutrino mass matrix which depends on only three real parameters. As a result of this, all three CP phases and the absolute neutrino mass scale are determined, the atmospheric mixing angle is maximal, and the Dirac CP can either be preserved with ? CP ?=?0, ? or maximally broken with ? CP ?=?±?/2 and sharp predictions for the Majorana phases and neutrinoless double beta deca
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