Heavy bottom squark mass in the light gluino and light bottom squark scenario

Restrictive upper bounds on the heavy bottom squark mass when the gluino and one bottom squark are both light are based on the predicted reduction of $R_b$ (the fraction of $Z$ hadronic decays to $b \bar b$ pairs) in such a scenario. These bounds are found to be relaxed by the process $Z \to b\bar{\tilde b}{\tilde g}/{\bar b}{\tilde b}{\tilde g}$, which may partially compensate for the reduction of $R_b$. The relaxation of bounds on the top squark and the scale-dependence of the strong coupling constant are also discussed.Comment: 9 pages, LaTeX, 2 figures, to be submitted to Phys. Lett. B, more discussions adde

The TASCC of Secretion

Author Manuscript 2012 July 05The oncogene-induced activation of signaling pathways involving the tumor suppressor proteins p53 and retinoblastoma is likely an important mechanism for preventing the proliferation of potential cancer cells (1, 2). This activation causes cells to exit the cell division cycle and enter a senescent state, which is characterized by major changes in chromatin structure that are thought to render senescence irreversible. Despite the absence of proliferation, senescent cells are not as quiescent as first thought, as they signal to their surrounding environment by activating a protein secretion program (3, 4). On page 966 of this issue, Narita et al. (5) show that to enable this secretory state, a senescent cell profoundly reorganizes its endomembrane system

New Experiments with Antiprotons

Fermilab operates the world's most intense antiproton source. Newly proposed experiments can use those antiprotons either parasitically during Tevatron Collider running or after the Tevatron Collider finishes in about 2011. For example, the annihilation of 8 GeV antiprotons might make the world's most intense source of tagged D^0 mesons, and thus the best near-term opportunity to study charm mixing and, via CP violation, to search for new physics. Other potential measurements include sensitive studies of hyperons and of the mysterious X, Y, and Z states. Production of antihydrogen in flight can be used for first searches for antihydrogen CPT violation. With antiproton deceleration to low energy, an experiment using a Penning trap and an atom interferometer could make the world's first measurement of the gravitational force on antimatter.Comment: Prepared for the Proceedings of the 4th International Symposium on Symmetries in Subatomic Physics (SSP2009), June 2-5, 2009, Department of Physics, National Taiwan University, Taipei, Taiwa

Juntos y Saludables: Outcomes of a peer led approach to obesity prevention for Head Start

Purpose: The purpose of this study was to evaluate Juntos y Saludables (Get Healthy Together), a multi-component obesity prevention pilot tailored for Mexican American Head Start children (ages 3-5). For the parent education component, researchers trained seven peer parent educators to deliver health information via afterschool parent education sessions. When parents attended the sessions, they received a take-home bag with a book and family activity to promote physical activity in the home. Method: Parent intercept interviews, focus groups, and questionnaires were collected (average 80% participation rate). Results: Average participation rate at the parent education sessions was 46% and rates varied between 34% (61 parents) and 53% (94 parents). More parents in the intervention school reported that their child ate fruit at least 3 times (83.5% versus 79.17%), ate in front of the television less than three times (70.87% versus 49.38%) during the typical week and more parents reported that their child watched 2 hours or less of television each day (73.79% versus 13.19%), compared to the comparison school. 81% of parents interviewed correctly identified the program name. On average, parents could recall almost 3 (M=2.94, SD=1.92) of the 8 key messages without a prompt and about 6 (M=5.91, SD=1.88) when prompted. Messages recalled the most, without a prompt, included (1) preschoolers need 60 minutes of physical activity each day, and (2) children who get all five servings of fruits and vegetables each day are more likely to get the nutrients they need. In the focus group, parents reported that they enjoyed the peer-led session format and session scheduled time. Conclusion: Results suggest that peer-led approaches can be highly effective with parents, especially when addressing childhood obesity prevention

Lessons Learned from Juntos Y Saludables Peer-Led Parent Education

Purpose: The objective of this study was to assess the quality of training received by peer educators in the Juntos y Saludables (Get Healthy Together) program. Juntos y Saludables is a multi-component childhood obesity prevention program for Head Start. Method: This study applied the peer led education approach to provide parents with education regarding healthy growth among their children. Seven parents were recruited through teachers, other parents, and the Parent Leadership Institute at a local Head Start center. Faculty and graduate assistants from local universities provided training to the parent educators in both English and Spanish. Training sessions were conducted the week of each new parent education session, with one booster training after spring break (7 training sessions in total). The parent educators were trained to: (1) encourage the Head Start parents to participate in the sessions, (2) explain the health messages, and (3) answer any questions the parents had. A focus group was conducted at the end of the program, with all seven parent educators, to assess their feedback about the training they received. Results: The peer parent educators reported that they became educators to improve children’s health. They were satisfied with the training methods and felt that they learned a lot of information regarding nutrition and physical activity recommendations for their children. They also reported feeling comfortable delivering health information to other parents. Parent educators appreciated that they could work together (e.g., in bilingual pairs) to provide the health education to parents in both English and Spanish. The peer parent education training session attendance was high-71% and greater. Conclusions: Most peer parent educators felt comfortable and confident delivering the material as the program progressed. Earlier training might assist the parent educators to have greater familiarity with content prior to the first session. Educators also created strategies to deal with situations that arose during the sessions (e.g. crowd control, parents requesting extra bags). Future training can include suggested strategies to handle similar situations

New charmonium-like states

In recent years the B-factories and other machines have found evidence for a large number of new states with hidden charm: candidate h_c(1P), eta_c(2S), and chi_{c2}(2P) states; the well-established X(3872); enhancements called X(3940), Y(3940), and Y(4260); and a new structure at 4350 MeV. Various conventional-charmonium and more exotic interpretations of these data have been proposed. In this talk we review the current state of the experimental evidence and the prospects for clarifying the spectrum.Comment: 6 pages, 5 figures. To appear in the proceedings of Beauty 200

Inclusive decays of ηb\eta_{b} into SS- and PP-wave charmonium states

Inclusive S- and P-wave charmonium productions in the bottomonium ground state $\eta_b$ decay are calculated at the leading order in the strong coupling constant $\alpha_s$ and quarkonium internal relative velocity $v$ in the framework of the NRQCD factorization approach. We find the contribution of $\eta_b \to \chi_{c_J}+ g g$ followed by $\chi_{c_J} \to J/\psi+ \gamma$ is also very important to the inclusive $J/\psi$ production in the $\eta_b$ decays, which maybe helpful to the investigation of the color-octet mechanism in the inclusive $J/\psi$ production in the $\eta_b$ decays in the forthcoming LHCb and SuperB. As a complementary work, we also study the inclusive production of $\eta_c$, and $\chi_{cJ}$ in the $\eta_b$ decays, which may help us understand the X(3940) and X(3872) states.Comment: 7 pages, 2 figure

Understanding the newly observed Y(4008) by Belle

Very recently a new enhancement around 4.05 GeV was observed by Belle experiment. In this short note, we discuss some possible assignments for this enhancement, i.e. $\psi(3S)$ and $D^*\bar{D}^*$ molecular state. In these two assignments, Y(4008) can decay into $J/\psi\pi^0\pi^0$ with comparable branching ratio with that of $Y(4008)\to J/\psi\pi^+\pi^-$. Thus one suggests high energy experimentalists to look for Y(4008) in $J/\psi\pi^0\pi^0$ channel. Furthermore one proposes further experiments to search missing channel $D\bar{D}$, $D\bar{D}^*+h.c.$ and especially $\chi_{cJ}\pi^+\pi^-\pi^0$ and $\eta_c\pi^+\pi^-\pi^0$, which will be helpful to distinguish $\psi(3S)$ and $D^*\bar{D}^*$ molecular state assignments for this new enhancement.Comment: 4 pages, 5 figures. Typos correcte

Deviation from Tri-Bimaximal Mixing and Large Reactor Mixing Angle

Recent observations for a non-zero $\theta_{13}$ have come from various experiments. We study a model of lepton mixing with a 2-3 flavor symmetry to accommodate the sizable $\theta_{13}$ measurement. In this work, we derive deviations from the tri-bimaximal (TBM) pattern arising from breaking the flavor symmetry in the neutrino sector, while the charged leptons contribution has been discussed in a previous work. Contributions from both sectors towards accommodating the non-zero $\theta_{13}$ measurement are presented.Comment: 25 pages, 12 figures. arXiv admin note: text overlap with arXiv:1109.232

Spin excitations of individual magnetic dopants in an ionic thin film

Individual magnetic transition metal dopants in a solid host usually exhibit relatively small spin excitation energies of a few meV. Using scanning tunneling microscopy and inelastic electron tunneling spectroscopy (IETS) techniques, we have observed a high spin excitation energy around 36 meV for an individual Co substitutional dopant in ultrathin NaCl films. In contrast, the Cr dopant in the NaCl film shows much lower spin excitation energy around 2.5 meV. Electronic multiplet calculations combined with first-principles calculations confirm the spin excitation induced IETS, and quantitatively reveal the out-of-plane magnetic anisotropies for both Co and Cr. They also allow reproducing the experimentally observed redshift in the spin excitations of Co dimers and ascribe it to a charge and geometry redistribution.This research was supported by the National Natural Science Foundation of China (91961102, 11704057), the Shenzhen fundamental research funding (JCYJ20190806112206698), the starting funding from HIT Shenzhen (HA45001082), and the Research Foundation Flanders (G0D56.19N and G0A05.19N) and by the KU Leuven Research Council (C14/22/103). Financial support by the following Projects: RTI2018-097895-B-C41, PID2019-109539GB-C41 and PID2019-103910GB-I00, funded by MCIN/AEI/10.13039/501100011033/ and FEDER Una manera de hacer Europa, as well as GIU18/138 by Universidad del Pais Vasco UPV/EHU; IT-1246-19, IT986-16 and IT-1260-19 by Gobierno Vasco, is gratefully acknowledged