Semileptonic BB and BsB_{s} decays into orbitally excited charmed mesons

The BaBar Collaboration has recently reported products of branching fractions that include $B$ meson semileptonic decays into final states with charged and neutral $D_{1}(2420)$ and $D_{2}^{\ast}(2460)$, two narrow orbitally excited charmed mesons. We evaluate these branching fractions, together with those concerning $D_{0}^{\ast}(2400)$ and $D_{1}'(2430)$ mesons, within the framework of a constituent quark model. The calculation is performed in two steps, one of which involves a semileptonic decay and the other is mediated by a strong process. Our results are in agreement with the experimental data. We also extend the study to semileptonic decays of $B_{s}$ into orbitally excited charmed-strange mesons, providing predictions to the possible measurements to be carried out at LHC.Comment: Physical Review D 84, 094029 (2011). 20 pages, 9 figure

Nonleptonic B→D(∗)DsJ(∗)B \to D^{(*)}D_{sJ}^{(*)} decays and the nature of the orbitally excited charmed-strange mesons

The Belle Collaboration has recently reported a study of the decays $B \to D_{s1}(2536)^{+}\bar{D}^{(\ast)}$ and has given also estimates of relevant ratios between branching fractions of decays $B \to D^{(\ast)}D_{sJ}^{(\ast)}$ providing important information to check the structure of the $D_{s0}^{\ast}(2317)$, $D_{s1}(2460)$ and $D_{s1}(2536)$ mesons. The disagreement between experimental data and Heavy Quark Symmetry has been used as an indication that $D_{s0}^{\ast}(2317)$ and $D_{s1}(2460)$ mesons could have a more complex structure than the canonical $c\bar{s}$ one. We analyze these ratios within the framework of a constituent quark model, which allows us to incorporate the effects given by finite $c$-quark mass corrections. Our findings are that while the $D_{s1}(2460)$ meson could have a sizable non-$q\bar{q}$ component, the $D_{s0}^{\ast}(2317)$ and $D_{s1}(2536)$ mesons seem to be well described by a pure $q\bar{q}$ structure.Comment: 13 pages, 1 figur

Las diapositivas como apoyo al discurso oral en la docencia universitaria: perspectiva de los estudiantes en el marco de un proceso de mentorización

Presentamos un estudio que surge en el seno de un proceso de mentorización de profesorado universitario novel desarrollado en la Facultad de Ciencias de la Educación de la Universidad de Granada, en la titulación de Maestro de Educación Primaria. En este contexto, el potencial de las diapositivas como apoyo al discurso oral del profesor emerge como una de las cuestiones relevantes en la reflexión sobre la práctica docente en una asignatura de Didáctica de la Matemática. Ante la diversidad de críticas que recibe este recurso, recurrimos a la opinión de los estudiantes para indagar en el uso de las diapositivas como apoyo para el desarrollo de las explicaciones expositivas, con el objetivo de identificar posibilidades y limitaciones del uso de este recurso y entender las implicaciones de su uso en el aula

Completing the picture of the Roper resonance

We employ a continuum approach to the three valence-quark bound-state problem in relativistic quantum field theory to predict a range of properties of the proton's radial excitation and thereby unify them with those of numerous other hadrons. Our analysis indicates that the nucleon's first radial excitation is the Roper resonance. It consists of a core of three dressed-quarks, which expresses its valence-quark content and whose charge radius is 80% larger than the proton analogue. That core is complemented by a meson cloud, which reduces the observed Roper mass by roughly 20%. The meson cloud materially affects long-wavelength characteristics of the Roper electroproduction amplitudes but the quark core is revealed to probes with $Q^2 \gtrsim 3 m_N^2$.Comment: 6 pages, 3 figure

Weighted norm inequalities for polynomial expansions associated to some measures with mass points

Fourier series in orthogonal polynomials with respect to a measure $\nu$ on $[-1,1]$ are studied when $\nu$ is a linear combination of a generalized Jacobi weight and finitely many Dirac deltas in $[-1,1]$. We prove some weighted norm inequalities for the partial sum operators $S_n$, their maximal operator $S^*$ and the commutator $[M_b, S_n]$, where $M_b$ denotes the operator of pointwise multiplication by b \in \BMO. We also prove some norm inequalities for $S_n$ when $\nu$ is a sum of a Laguerre weight on $\R^+$ and a positive mass on $0$

El proceso de mentorización: un espacio para la reflexión docente

En este trabajo destacamos y reflexionamos sobre algunas cuestiones surgidas dentro de nuestra actividad en un proceso de mentorización del profesorado novel. Este proceso tiene como principal objetivo la mejora en la formación docente. Además, en estos momentos de cambio hacia el Espacio Europeo de Educación Superior (EEES), se constituye en un espacio de reflexión sobre la docencia de todo el profesorado participante que trasciende a todo el área a la que pertenece dicho profesorado

Comportamento de cultivares de alface no Território Federal do Amapá.

Visando identificar cultivares de alface capazes de produzirem economicamente nas condições edafoclimaticas do Território Federal do Amapá, estão sendo conduzidos, no Campo Experimental de Fazendinha da UEPAT de Macapá, ensaios de avaliação de diversas cultivares desta hortaliças.bitstream/item/65084/1/AP-1986-comportamento-cultivares-alface.pd

Avaliação de cultivares e hibridos de pepino no Amapá.

Objetivando avaliar o comportamento e produtividade de diversas introduções de pepino nas condições edafoclimaticas do Amapá, foram conduzidos no Campo Experimental de Fazendinha, da UEPAT de Macapá, três ensaios de avaliação desta importante hortaliça.bitstream/item/65086/1/AP-1986-avaliacao-cultivares-hibridos-pepino.pd

Unha-de-gato, usos medicinais, ocorrência e conservação a campo no Amapá, Brasil.

O presente trabalho objetiva a coleta e formação a campo do banco das espécies medicinais Uncaria guianensis e U. tomentosa, assim como realizar o levantamento dos usos medicinais e da ocorrência das mesmas no Amapá. Sua distribuição é restrita ao ecossistema de floresta tropical úmida, tanto várzea como de terra firme, em solos distróficos do Grande Grupo do Latossolo Amarelo e/ou Gley Pouco Húmico e, clima Tropical do tipo Afi e Ami. Apresenta vasta gama de usos, no entanto, até o momento, sua exploração é extrativista e sem o uso de nenhum manejo que garanta sustentabilidade na sua exploração