1,949,775 research outputs found
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
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
No full textAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
Splitting the two localised suspension of CP infinity cross product with CP infinity
No full textThis note describes the splitting of the two localisation of the suspension of CP infinity cross product with CP infinity into a bouquet of spaces. In particular this paper describes the integral cohomology of the pieces. The splitting can be used to generate elements of the n-th bordism group leading to a construction of immersions with an odd number of triple points
CP-violation in cascade decays at the LHC
No full textWe study the potential to observe CP-violating effects in various supersymmetric cascade
decay chains at the LHC. Asymmetries composed by triple products of
momenta of the final state particles are sensitive to CP-violating
effects. We analytically calculate the cascade decays including the relevant spin correlations to compute the parton level asymmetry. In addition, we use Monte Carlo simulations to estimate the sensitivity of the LHC to the CP-violating observables.
Due to large boosts that dilute the asymmetries, these can be
difficult to observe at the LHC. However, if all particle masses in a cascade decay are
known, it may be possible to reconstruct all momenta in the decay chains. We can then recover the full asymmetry on an
event-by-event basis even when we have missing momentum due to a stable
lightest supersymmetric particle. After the reconstruction, the non-diluted CP-violating signal gets
significantly enhanced so that an observation may become feasible.
A fully hadronic study has also been completed to produce the best estimate of the viability of these obseravbles at the LHC. We include both standard model and SUSY backgrounds in the study. Our conclusions state that given a favourable scenario, CP-violation may be observed in SUSY at the 3-sigma level over a wide range of CP-phases with 500 1/fb of data
Rapport d'activités 1993-94 du département des Cultures Pérennes CIRAD-CP
No full textCe rapport dresse un bilan des activités du département Cultures Pérennes du CIRAD en 1993 et 1994. Après une brève présentation du département et de son organisation, il décrit les cinq programmes de recherches (cacaoyer, caféier, cocotier, hévéa, palmier à huile), l'ensemble des recherches thématiques conduite au sein des unités de recherche ainsi que les missions effectuées sur les deux années. Les grandes lignes de la formation dispensée et des coopérations du CIRAD-CP sont exposées. Un bilan social et financier complète ce rapport. En annexe est jointe, la liste des publications des chercheurs du départemen
Collaborations CIRAD-CP-AMAP. Bilan des travaux
No full textLa modélisation de l'architecture des plantes pérennes a été mise en oeuvre sur le caféier, l'hévéa, le palmier à huile, le cocotier et le cacaoyer. Les objectifs suivis étaient : l'identification de la variabilité et l'invariance des caractéristiques morphologiques de la croissance et de la ramification des végétaux, la définition des étapes endogènes du développement architectural des végétaux, la caractérisation da la plasticité architecturale et le mode d'action des facteurs externes. La compréhension et l'analyse de la variabilité génétique ont abouti à la mise au point d'une méthode d'évaluation des bases quantitatives et qualitatives du fonctionnement global des végétaux. Ces recherches ont nécessité la collaboration et le partenariat entre plusieurs départements et centre de recherche : IFCC, IRHO, Cirad-cp et Cirad-gerdat. Ce document présente les résultats, les applications et les perspectives des recherches menées depuis 20 an
Rapport d'activités 1995 du département des cultures pérennes du CIRAD (CIRAD-CP)
No full textCe rapport dresse un bilan des activités du département Cultures Pérennes du CIRAD en 1995. Après une brève présentation du département caféier, cocotier, hévéa, palmier à huile), l'ensemble des recherches et de son organisation, il décrit les cinq programmes de recherches (cacaoyer, caféier, cocotier, hévéa, palmier à huile), l'ensemble des recherches thématiques conduite au sein des unités de recherche ainsi que les missions effectuées sur les deux années. Les grandes lignes de la formation dispensée et des coopérations du CIRAD-CP sont exposées. Un bilan social et financier complète ce rapport. En annexe est jointe, la liste des publications des chercheurs du départemen
Methodological reconciliation of CP and MLSS and their agreement with the maximal metabolic steady state
No full textThe critical power (CP) and maximal lactate steady state (MLSS) are operational surrogates of the maximal metabolic steady state (MMSS). However, their concordance and their agreement with MMSS remain variable likely because of methodological factors.
Purpose
This study aimed to compare the concordance between CP and MLSS estimated by various models and criteria and their agreement with MMSS.
Methods
After a ramp test, 10 recreationally active males performed four to five severe-intensity constant-power output (PO) trials to estimate CP and three to four constant-PO trials to determine MLSS and identify MMSS. CP was computed using the three-parameter hyperbolic (CP3-hyp), two-parameter hyperbolic (CP2-hyp), linear (CPlin), and inverse of time (CP1/Tlim) models. In addition, the model with the lowest combined parameter error identified the “best-fit” CP (CPbest-fit). MLSS was determined as an increase in blood lactate concentration ≤1 mM during constant-PO cycling from the 5th (MLSS5–30), 10th (MLSS10–30), 15th (MLSS15–30), 20th (MLSS20–30), or 25th (MLSS25–30) to 30th minute. MMSS was identified as the greatest PO associated with the highest submaximal steady-state V ̇O2 (MV ̇O2ss).
Results
Concordance between the various CP and MLSS estimates was greatest when MLSS was identified as MLSS15–30, MLSS20–30, and MLSS25–30. The PO at MV ̇O2ss was 243 ± 43 W. Of the various CP models and MLSS criteria, CP2-hyp (244 ± 46 W) and CPlin (248 ± 46 W) and MLSS15–30 and MLSS20–30 (both 245 ± 46 W), respectively, displayed, on average, the greatest agreement with MV ̇O2ss. Nevertheless, all CP models and MLSS criteria demonstrated some degree of inaccuracies with respect to MV ̇O2ss.
Conclusions
Differences between CP and MLSS can be reconciled with optimal methods of determination. When estimating MMSS, from CP the error margin of the model estimate should be considered. For MLSS, MLSS15–30 and MLSS20–30 demonstrated the highest degree of accuracy
Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays
No full textThis Letter reports a measurement of the CP violation observables SJ/ψK0S and CJ/ψK0S in the decay channel B0→J/ψK0S performed with 1.0 fb−1 of pp collisions at s√=7 TeV collected by the LHCb experiment. The fit to the data yields SJ/ψK0S=0.73±0.07(stat)±0.04(syst) and CJ/ψK0S=0.03±0.09(stat)±0.01(syst). Both values are consistent with the current world averages and within
expectations from the Standard Model
Measurement of the CP-violating phase \phi s in Bs->J/\psi\pi+\pi- decays
No full textMeasurement of the mixing-induced CP-violating phase phi_s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/\psi pi+ pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of phi_s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found
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