4,973 research outputs found
Shedding light on the asymmetry: the photon handle
We investigate a charge asymmetry in production at the LHC
that provides complementary information to the measured asymmetries in production. We estimate the experimental uncertainty in its measurement at
the LHC with 8 and 14 TeV. For new physics models that simultaneously reproduce
the asymmetry excess in at the Tevatron and the SM-like asymmetry at
the LHC, the measurement in at the LHC could exhibit
significant deviations with respect to the SM prediction.Comment: LaTeX 15 page
Asymmetries in top quark pair production at hadron colliders
We review the asymmetries in top quark pair production at the Tevatron and
the LHC. We summarize the experimental measurements and the interpretations of
a possible excess in terms of new physics. We also review other top quark
properties-emphasizing effects related to the asymmetries-as well as
other collider signals.Comment: RevTeX 40 pages. Final version to be published in Reviews of Modern
Physics, with several addition
Boosting the t tbar charge asymmetry
We propose a kinematical enhancement of the t tbar charge asymmetry at the
LHC by selecting events with the t tbar centre of mass frame highly boosted
along the beam axis. This kinematical selection increases the asymmetries and
their significance up to a factor of two in a rather model-independent fashion.
Hence, it can be a perfect complement to enhance model discrimination at the
LHC.Comment: LaTeX 15 pages. Enlarged discussions and several plots added. Final
version to appear in PL
Air radon concentration decrease in a waste water treatment plant
Rn-222 is a naturally occurring gas created from the decay of Ra-226. The long-term health risk of breathing radon is lung cancer. One particular place where indoor radon concentrations can exceed national guidelines is in wastewater treatment plants (WWTPs) where treatment processes may contribute to ambient airborne concentrations. The aim of this paper was to study the radon concentration decrease after the application of corrective measures in a Spanish WWTP. According to first measures, air radon concentration exceeded International Commission Radiologica1 Protection (ICRP) normative (recommends intervention between 400 and 1000 Bq m(-3)). Therefore, the WWTP improved mechanical forced ventilation to lower occupational exposure. This measure allowed to increase the administrative controls, since the limitation of workers access to the plant changed from 2 h d(-1) (considering a maximum permissible dose of 20 mSv y(-1) averaged over 5 y) to 7 h d(-1).Juste Vidal, BJ.; Ortiz Moragón, J.; Verdú MartÃn, GJ.; Martorell Alsina, SS. (2015). Air radon concentration decrease in a waste water treatment plant. Oxford University Press. doi:10.1093/RPD/NCV329
Functional barriers to the adoption of electronic banking: The moderating effect of gender
The adoption of electronic banking in Spain is lower compared to other countries. This study analyzes the barriers that prevent its adoption, with the conceptual framework of the theory of resistance to innovation. In addition, it analyzes the moderating effect of gender on these barriers. Using structural equations, through PLS and multi-group analysis, the results confirm consumer resistance to electronic banking adoption by functional barriers. It highlights the importance of the value barrier, being this aspect of particular relevance for men, while women are more affected by the complexity in the use of electronic banking. These results have implications for management in overcoming non-adopters’ resistance to the innovation.
La adopción de la banca electrónica en España es menor en comparación con otros paÃses. Este estudio analiza las barreras que impiden su adopción, con el marco conceptual de la teorÃa de la resistencia a la innovación. Además, analiza el efecto moderador del género sobre estas barreras. Utilizando ecuaciones estructurales, a través de PLS y análisis multi-grupo, los resultados confirman la resistencia del consumidor a la adopción de la banca electrónica por barreras funcionales. Destaca la importancia de la barrera de valor, siendo este aspecto de especial relevancia para los hombres, mientras que a las mujeres les impacta más la complejidad en el uso de la banca electrónica. Estos resultados tienen implicaciones para la gestión para superar la resistencia de los no adoptantes a la innovación
Collider-independent t tbar forward-backward asymmetries
We introduce the forward-backward asymmetries A_u, A_d corresponding to u
ubar, d dbar -> t tbar production, respectively, at hadron colliders. These are
collider- and center-of-mass-independent observables, directly related to the
forward-backward and charge asymmetries measured at the Tevatron and the LHC,
respectively. We discuss how to extract these asymmetries from data. Because
these asymmetries are collider-independent, their measurement at these two
colliders could elucidate the nature of the anomalous forward-backward
asymmetry measured at the Tevatron. Our framework also shows in a
model-independent fashion that a positive Tevatron asymmetry exceeding the
standard model expectation is compatible with the small asymmetry measured at
the LHC.Comment: RevTeX 5 pages. Extended discussion about A_FB vs A_C, several
clarifications, references added. Version to appear in PR
Socioeconomic and Ethnobotanical Importance of the Breadfruit Tree (Artocarpus Communis J. G & G. Forster) in Benin
This study aims to evaluate ethnobotanical knowledge that populations hold and income from the exploitation of the breadfruit (Artocarpus communis) in southern Benin. The data collected by interview and focus group are related to the uses of Artocarpus communis, harvest methods and the habitat of specie. The results show that A. communis is used for: food, trade, artisanal, energetic, cultural and medicinal. Local populations know the species with unequal distribution among gender (Men ID = 0.75 and IE = 0.08) and Women (ID = 0.48 and IE = 0.06); and when it comes to age (Young ID = 0.56 and IE = 0.07; Adult ID = 0.606 and IE = 0.08; Old ID = 0.75 and IE = 0.1) suggesting that people make various uses of the species. The most used plant part was the fruit (VUT=11, 87). These organs (Fruits, Flowers, Leaf), are collected either by picking or collecting, (bark) by debarking and (root) by digging. 50.51% of people surveyed collected those organs on breadfruit trees present at homes, 14.65% on those present in fields, 11.62% in the dregs and 23.23% in fallow lands. The average fruit yield of an orchard is estimated at 17 tonnes/ha, which represents an average income of about 2817 USD/individual/year
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