Light Neutralinos in B-Decays

We consider the decays of a $B_s$-meson into a pair of lightest supersymmetric particles (LSP) in the minimal supersymmetric standard model. It is found that the parameter space for light LSP's in the range of 1 GeV can be appreciably constrained by looking for such decays.Comment: 9 pages, LaTex, 2 figures (hard copies of the figures available from the Authors on request

Tau mesonic decays and strong anomaly of PCAC

Strong anomaly of the PCAC is found in $\tau\rightarrow\omega \pi\pi\nu$ and $\omega\rho\nu$ in the chiral limit. It originates in WZW anomaly. Theoretical result of $\tau\rightarrow\omega\pi\pi\nu$ agrees with data well and the measurement of $\tau\rightarrow\omega\rho\nu$ will confirm the strong anomaly of PCAC. The strong anomaly of PCAC is studied.Comment: 27 page

Rhythmic TMS as a Feasible Tool to Uncover the Oscillatory Signatures of Audiovisual Integration

Multisensory integration is quintessential to adaptive behavior, with clinical populations showing significant impairments in this domain, most notably hallucinatory reports. Interestingly, altered cross-modal interactions have also been reported in healthy individuals when engaged in tasks such as the Sound-Induced Flash-Illusion (SIFI). The temporal dynamics of the SIFI have been recently tied to the speed of occipital alpha rhythms (IAF), with faster oscillations entailing reduced temporal windows within which the illusion is experienced. In this regard, entrainment-based protocols have not yet implemented rhythmic transcranial magnetic stimulation (rhTMS) to causally test for this relationship. It thus remains to be evaluated whether rhTMS-induced acoustic and somatosensory sensations may not specifically interfere with the illusion. Here, we addressed this issue by asking 27 volunteers to perform a SIFI paradigm under different Sham and active rhTMS protocols, delivered over the occipital pole at the IAF. Although TMS has been proven to act upon brain tissues excitability, results show that the SIFI occurred for both Sham and active rhTMS, with the illusory rate not being significantly different between baseline and stimulation conditions. This aligns with the discrete sampling hypothesis, for which alpha amplitude modulation, known to reflect changes in cortical excitability, should not account for changes in the illusory rate. Moreover, these findings highlight the viability of rhTMS-based interventions as a means to probe the neuroelectric signatures of illusory and hallucinatory audiovisual experiences, in healthy and neuropsychiatric populations

Meson Decay Constants from Isospin Mass Splittings in the Quark Model

Decay constants of $D$ and $B$ mesons are estimated within the framework of a heavy-quark approach using measured isospin mass splittings in the $D$, $D^*$, and $B$ states to isolate the electromagnetic hyperfine interaction between quarks. The values $f_D = (262 \pm 29)$ MeV and $f_B = (160 \pm 17)$ MeV are obtained. Only experimental errors are given; possible theoretical ambiguities, and suggestions for reducing them, are noted.Comment: 7 pages, LaTeX, EFI-92-3

Desempenho de cultivares de batata sob condições ambientais de estiagem.

BRS Ana é uma cultivar de batata que apresenta elevado potencial produtivo, película rosada, ciclo vegetativo tardio e grande vigor de planta; apresenta ainda tolerância à falta de água, provavelmente devido ao seu sistema radicular bem desenvolvido (PEREIRA et al, 2008). Ágata é a cultivar de película amarela mais cultivada no país, apresenta elevado potencial produtivo, porém, para isso, necessita de grande quantidade de insumos como adubos e defensivos, e é sabidamente sensível à falta de água (ROHR et al, 2001). Já a cultivar BRS Clara, possui película amarela, e em condições de campo mostra certa tolerância à falta de água, esta tolerância também foi observada em laboratório (ROHR et al, 2001). Dentre as espécies vegetais cultivadas pelo homem, a batata é uma das mais sensíveis à falta de água. Sendo os efeitos adversos máximos durante o período de estolonização e formação dos tubérculos. De maneira geral, essa cultura consome de 300 a 800 mm de água durante todo o ciclo, dependendo principalmente, das condições climáticas predominantes (GARCIA, 2003). A resposta diferencial de cultivares de batata ao estresse hídrico indica que há variabilidade genética para a tolerância à seca no germoplasma de batata (LEVY, 1983). Entretanto, diante da complexidade de fenotipagem para a resposta à seca, ainda são limitados os estudos abordando o estresse hídrico de seca para esta cultura (ROHR et al, 2001). O objetivo do presente trabalho foi verificar o desempenho das cultivares de batata BRS Ana, BRS Clara e Agata, cultivadas sob condições climáticas de estiagem, em relação ao rendimento de tubérculos

Weak Phase γ\gamma From Ratio of B→KπB \to K \pi Rates

The ratio of partial decay rates for charged and neutral $B$ mesons to $K \pi$ final states provides information on the weak phase $\gamma \equiv {\rm Arg} (V_{ub}^*)$ when augmented with information on the CP-violating asymmetry in the $K^\pm \pi^\mp$ mode. The requirements for a useful determination of $\gamma$ are examined in the light of present information about the decays $B^0 \to K^+ \pi^-$, $B^+ \to K^0 \pi^+$, and the corresponding charge-conjugate modes. The effects of electroweak penguins and rescattering corrections are noted, and proposals are made for estimating and measuring their importance.Comment: 16 pages, latex, 3 figures, revised version sent to Phys. Rev.