Shedding Light on Top Partner at the LHC

We investigate the sensitivity of the 14 TeV LHC to pair-produced top partners ($T$) decaying into the Standard Model top quark ($t$) plus either a gluon ($g$) or a photon ($\gamma$). The decays $T\rightarrow tg$ and $T\rightarrow t\gamma$ can be dominant when the mixing between the top partner and top quark are negligible. In this case, the conventional decays $T\rightarrow bW$, $T\rightarrow tZ$, and $T\rightarrow th$ are highly suppressed and can be neglected. We take a model-independent approach using effective operators for the $T$-$t$-$g$ and $T$-$t$-$\gamma$ interactions, considering both spin-$\frac{1}{2}$ and spin-$\frac{3}{2}$ top partners. We perform a semi-realistic simulation with boosted top quark tagging and an appropriate implementation of a jet-faking-photon rate. Despite a simple dimensional analysis indicating that the branching ratios ${\rm BR}(T\rightarrow t\gamma)\ll {\rm BR}(T\rightarrow tg)$ due to the electric-magnetic coupling being much smaller than the strong force coupling, our study shows that the LHC sensitivity to $T\bar{T}\rightarrow t\overline{t}\gamma g$ is more significant than the sensitivity to $T\overline{T}\rightarrow t\overline{t}gg$. This is due to much smaller backgrounds attributed to the isolated high-$p_T$ photon. We find that with these decay channels and 3 ab$^{-1}$ of data, the LHC is sensitive to top partner masses $m_T\lesssim 1.4-1.8$~TeV for spin-$\frac{1}{2}$ and spin-$\frac{3}{2}$ top partners, respectively.Comment: 33 pages, 10 figures, 7 table

STUDI PENGARUH PEMANASAN BERULANG DAN WAKTU TAHAN PEMANASAN MINYAK GORENG TERHADAP NILAI KOEFISIEN VISKOSITAS

Pengukuran nilai koefisien viskositas minyak goreng kelapa sawit menggunakan metode bola jatuh telah berhasil dilakukan. Penentuan nilai viskositas dilakukan dengan mengukur waktu tempuh jatuhnya bola ke dalam minyak, kerapatan bola dan minyak, diameter dan massa dari bola, dan kecepatan bola di dalam minyak.. Pengukuran viskositas minyak kelapa sawit dilakukan pada produk minyak yang beredar di pasaran yaitu minyak kemasan A, B, C, D dan minyak curah. Kemudian dua produk dipilih untuk dilihat perubahan viskositas terhadap variasi pemanasan berulang dan waktu tahan pemanasan untuk sekali pemakaian. Hasil penelitian didapatkan bahwa viskositas dengan nilai paling tinggi dimiliki oleh minyak curah dan viskositas dengan nilai paling rendah dimiliki oleh minyak kemasan A. Selanjutnya didapatkan bahwa viskositas minyak yang dipanaskan selama 60 menit hampir sebanding dengan viskositas minyak dalam 6 kali pemakaian dengan waktu tahan selama 30 menit. Minyak goreng kelapa sawit dengan nilai viskositas yang lebih tinggi akan mendidih pada suhu yang lebih tinggi dan waktu pemanasan yang lebih lama. Minyak goreng kelapa sawit yang digunakan secara berulang tetapi dengan waktu penggunaan yang singkat lebih baik dari pada minyak goreng kelapa sawit yang dipakai satu kali namun dalam penggunaan yang lebih lama. Kata kunci: viskositas, minyak kelapa sawit, metode bola jatu

Boosted Dark Matter at the Deep Underground Neutrino Experiment

We investigate the detection prospects of a non-standard dark sector in the context of boosted dark matter. We consider a scenario where two stable particles have a large mass difference and the heavier particle accounts for most of dark matter in our current universe. The heavier candidate is assumed to have no interaction with the standard model particles at tree-level, hence evading existing constraints. Although subdominant, the lighter dark matter particles are efficiently produced via pair-annihilation of the heavier ones in the center of the Galaxy or the Sun. The large Lorentz boost enables detection of the non-minimal dark sector in large volume terrestrial experiments via exchange of a light dark photon with electrons or nuclei. Various experiments designed for neutrino physics and proton decay are examined in detail, including Super-K and Hyper-K. In this study, we focus on the sensitivity of the far detector at the Deep Underground Neutrino Experiment for boosted dark matter produced in the center of the Sun, and compare our findings with recent results for boosted dark matter produced in the galactic center.Comment: 11 Pages, 5 Figure

RISCBOT: Mobile Robots Exploration and Mapping In 2D

The objectives of the robots are to explore the whole environment as a group, while maintaining communication with the base computer throughout the entire exploration. Our method was implemented using a mobile robot equipped with a sonar range finder, a communication unit, and a software module. The robot performs collision free navigation, dynamic object detection, data collection, and communication with a base computer. This work demonstrates that multiple robots can improve overall mapping performance of an unknown environment

Parallel assessment of cell viability in cardiac and cancer cells following treatment with sunitinib

Various cardiopathological effects have been observed following chemotherapy treatment in cancer patients, due to anti-cancer drug-induced cardiotoxicity (CTX). A retrospective study of cancer survivors reported a 50% and 10% incidence of hypertension and heart failure respectively following treatment with the tyrosine kinase inhibitor sunitinib, licensed to treat pancreatic neuroendocrine tumours. The cellular mechanisms underlying CTX are not known. Here, for the first time, we compare the potency of sunitinib in both cardiac cells (primary cardiac fibroblasts (CFs)) and cancer cells (a pancreatic adenocarcinoma cell line (PANC-1)). Adult rat CFs were isolated by bulk collagenase digestion, maintained in culture and used between passages 1–2. PANC-1 cells, from previously-frozen stocks, were used between passages 41–49. Cells were treated with sunitinib (0–10 µM in CFs; 0–100 µM in PANC-1) for 24 hour prior to epifluorescent imaging for phenotypic assessment. Cell viability was examined by alamar blue assays following 24 hour sunitinib treatment (0–100 µM). Overall, results indicated increased sensitivity of CFs to sunitinib compared with PANC-1 cells. Phenotypic changes indicative of cell death, including appearance of intracellular vacuoles, were evident in CFs following 1 µM sunitinib treatment whereas similar effects were not induced until 10 µM treatment in PANC-1 cells. Alamar blue assays demonstrated a dramatic increase in CF death compared to PANC-1 death following treatment with 10 µM sunitinib (11.6±0.02 vs 56.5±1.5 (% viability) CF vs PANC-1, n=3). A lower IC50 value for sunitinib was required to exert the same effects on CF (IC505.2 µM) vs PANC-1 (IC5013.5 µM) cell viability. These results suggest sunitinib can cause lethal effects in cardiac cells at lower doses than those required to induce pancreatic cancer cell death. Future work will aim to identify cellular mechanisms responsible for these toxic effects. Parallel studies in cardiac and cancer cells will be beneficial in distinguishing how focused anti-cancer drug delivery could be improved to avoid CTX

Analysis of operating system diversity for intrusion tolerance

One of the key benefits of using intrusion-tolerant systems is the possibility of ensuring correct behavior in the presence of attacks and intrusions. These security gains are directly dependent on the components exhibiting failure diversity. To what extent failure diversity is observed in practical deployment depends on how diverse are the components that constitute the system. In this paper, we present a study with operating system's (OS's) vulnerability data from the NIST National Vulnerability Database (NVD). We have analyzed the vulnerabilities of 11 different OSs over a period of 18 years, to check how many of these vulnerabilities occur in more than one OS. We found this number to be low for several combinations of OSs. Hence, although there are a few caveats on the use of NVD data to support definitive conclusions, our analysis shows that by selecting appropriate OSs, one can preclude (or reduce substantially) common vulnerabilities from occurring in the replicas of the intrusion-tolerant system