Genealogical data of Boer and Nubian goats in Mexico

The pedigree file of the Boer and Nubian goat breeds in Mexico was constructed using the national database provided by the Asociación Mexicana de Criadores de Ganado Caprino de Registro. Field technicians routinely updated the goat national database by recording information from flocks participating in the performance-recording system. Information on animal identification number, parents, birth date, sex, breed, and farm of origin were used to undertake pedigree analyses using the ENDOG program (version 4.8). This paper presents a pedigree data file, tables and figures of characteristics of pedigree data, pedigree analyses, pedigree integrity, effective population size and genetic conservation index. The data can be used to estimate other population parameters, to monitor the genetic diversity of the Boer and Nubian goat breeds in Mexico, and also to design balanced breeding programs, maintaining genetic variation at reasonable levels and maximizing genetic progress in these populations.202

Impact of Auditory Affect on Urgent Behaviors on a Car Simulator

Emotional content abounds the driver in different forms from billboard signs to in-vehicle devices to roadside situations. Such emotional scenes can result in unsafe driving behaviors and lead to collisions due to their ability to attract attentional resources and change driving goals to irrelevant ones (Megías et al. 2011b; Briggs et al, 2011). Recent studies have looked at the way auditory and visual emotional stimuli can impact individual’s decision under Evaluative and Urgent road environment behaviors. Evaluative behaviors are known as a categorization in which people judge a scene as risky or not, whereas Urgent behaviors are time sensitive, requiring a person to quickly respond to the scene in order to avoid negative consequences (Megias et al, 2011a). Previous research has examined the way visual emotional stimuli affects driving performance; however, relatively little is known about the effects of auditory emotional stimuli (Chan, & Singhal, 2014). Among studies that examined both types of behaviors while participants viewed images depicting a driving scenario, auditory emotional stimuli served to speed Evaluative judging (judge whether the scene is risky or not), but not under Urgent judging (judge whether to brake or not) (Serrano, et al, 2013). It was also found that negative sounds lead to more performance errors in driving (Chan, & Singhal, 2014). The current study is designed to further examine a number of task features using a medium fidelity (GE Patrol SIM) driving simulator. Urgent behaviors related to a risky driving scenario and auditory sounds will be used. Using the motivational model of emotion looking at evolutionary flight-and-fight mechanisms (Bradley et al., 2001; Lang et al. 2008), we would, in contrast to previous studies of urgent behaviors, expect to find a difference under emotional content when participants drive a car simulator. A car simulator is able to mimic a real driving environment than looking at a static picture done in Serrano et al (2013). This study aims to empirically examine the effects of driver urgent behavior and time pressure on driver’s hazard perception in a controlled driving simulation. In this experiment, a car following scene with sudden car decelerations will measure participant’s braking, steering, and speed behavior. Participants will drive while listening to emotionally charged auditory sounds that vary in valence and arousal. Valence is how pleasant to unpleasant a stimulus is, whereas arousal is how stimulating to unstimulating a stimulus is. Emotional sounds will be instigated before a braking event occurs and will be randomized. Based on theoretical principles of the motivation model of emotion, it is hypothesized that highly arousing unpleasant sounds would have a higher impact on driving performance than pleasant and neutral sounds. Theoretical and practical implications will also be discussed

How much dark matter is there inside early-type galaxies?

We study the luminous mass as a function of the dynamical mass inside the effective radius (r_e) of early-type galaxies (ETGs) to search for differences between these masses. We assume Newtonian dynamics and that any difference between these masses is due to the presence of dark matter. We use several samples of ETGs -ranging from 19 000 to 98 000 objects- from the ninth data release of the Sloan Digital Sky Survey. We perform Monte Carlo (MC) simulations of galaxy samples and compare them with real samples. The main results are: i) MC simulations show that the distribution of the dynamical vs. luminous mass depends on the mass range where the ETGs are distributed (geometric effect). This dependence is caused by selection effects and intrinsic properties of the ETGs. ii) The amount of dark matter inside r_e is approximately 7% +- 22%. iii) This amount of dark matter is lower than the minimum estimate (10%) found in the literature and four times lower than the average (30%) of literature estimates. However, if we consider the associated error, our estimate is of the order of the literature average.Comment: 24 pages, 12 figures. MNRAS accepte

New Physics effects in the flavor-changing neutral couplings of the Top quark

We survey the flavor-changing neutral couplings (FCNC) of the top quark predicted by some extensions of the Standard Model: THDM, SUSY, L-R symmetric, TC2, 331, and models with extra quarks. Since the expected sensitivity of the LHC and ILC for the tcV (V=\gamma,g,Z) and tcH couplings is of order of a few percent, we emphasize the importance of any new physics effect that gives a prediction for these FCNC couplings within this limit. We also review the constraints imposed on these couplings from low-energy precision measurements.Comment: 19 pages, 7 figures. Accepted as a review paper in Int. J. of Mod. Phys.

FCNC Top Quark Decays in Extra Dimensions

The flavor changing neutral top quark decay t -> c X is computed, where X is a neutral standard model particle, in a extended model with a single extra dimension. The cases for the photon, X= \gamma$, and a Standard Model Higgs boson, X = H, are analyzed in detail in a non-linear$R_\xi gauge. We find that the branching ratios can be enhanced by the dynamics originated in the extra dimension. In the limit where 1/R >> ->, we have found Br(t -> c \gamma) \simeq 10^{-10} for 1/R = 0.5 TeV. For the decay t -> c H, we have found Br(t -> cH) \simeq 10^{-10} for a low Higgs mass value. The branching ratios go to zero when 1/R -> \infty.Comment: Accepted to be published in the Europ. Phys. Jour. C; 16 pages, 2 figure

Chromomagnetic Dipole Moment of the Top Quark Revisited

We study the complete one-loop contributions to the chromagnetic dipole moment $\Delta\kappa$ of the top quark in the Standard Model, two Higgs doublet models, topcolor assited technicolor models (TC2), 331 models and extended models with a single extra dimension. We find that the SM predicts $\Delta\kappa = - 0.056$ and that the predictions of the other models are also consitent with the constraints imposed on $\Delta\kappa$ by low-energy precision measurements.Comment: 20 pages, 5 figures, Updat

On the possibility of a very light A^0 at low \tan\beta

The searches at LEP II for the processes e^+e^-\to h^0Z and e^+e^-\to h^0A^0 in the Minimal Supersymmetric Standard Model (MSSM) fail to exclude regions of the m_h,m_A plane where \tan\beta <1, thus allowing a very light A^0 (m_A< 20 GeV). Such a parameter choice would predict a light H^\pm with m_{H^\pm}< m_W. Although the potentially large branching ratio for H^\pm \to A^0 W^* would ensure that H^\pm also escaped detection in direct searches at LEP II and the Tevatron Run I, we show that this elusive parameter space is overwhelmingly disfavoured by electroweak precision measurements.Comment: 11 pages, 2 figures, Revtex, references added, minor additions to tex