Measurement of the Λb0, Ξb-, and Ωb- Baryon Masses

Bottom baryons decaying to a J/ψ meson and a hyperon are reconstructed using 1.0  fb-1 of data collected in 2011 with the LHCb detector. Significant Λb0→J/ψΛ, Ξb-→J/ψΞ- and Ωb-→J/ψΩ- signals are observed and the corresponding masses are measured to be M(Λb0)=5619.53±0.13(stat.)±0.45(syst.)  MeV/c2, M(Ξb-)=5795.8±0.9(stat.)±0.4(syst.)  MeV/c2, M(Ωb-)=6046.0±2.2(stat.)±0.5(syst.)  MeV/c2, while the differences with respect to the Λb0 mass are M(Ξb-)-M(Λb0)=176.2±0.9(stat.)±0.1(syst.)  MeV/c2, M(Ωb-)-M(Λb0)=426.4±2.2(stat.)±0.4(syst.)  MeV/c2. These are the most precise mass measurements of the Λb0, Ξb- and Ωb- baryons to date. Averaging the above Λb0 mass measurement with that published by LHCb using 35  pb-1 of data collected in 2010 yields M(Λb0)=5619.44±0.13(stat.)±0.38(syst.)  MeV/c2

Multi-messenger observations of a binary neutron star merger

On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected a gamma-ray burst (GRB 170817A) with a time delay of ~1.7 s with respect to the merger time. From the gravitational-wave signal, the source was initially localized to a sky region of 31 deg2 at a luminosity distance of 40+8-8 Mpc and with component masses consistent with neutron stars. The component masses were later measured to be in the range 0.86 to 2.26 Mo. An extensive observing campaign was launched across the electromagnetic spectrum leading to the discovery of a bright optical transient (SSS17a, now with the IAU identification of AT 2017gfo) in NGC 4993 (at ~40 Mpc) less than 11 hours after the merger by the One- Meter, Two Hemisphere (1M2H) team using the 1 m Swope Telescope. The optical transient was independently detected by multiple teams within an hour. Subsequent observations targeted the object and its environment. Early ultraviolet observations revealed a blue transient that faded within 48 hours. Optical and infrared observations showed a redward evolution over ~10 days. Following early non-detections, X-ray and radio emission were discovered at the transient’s position ~9 and ~16 days, respectively, after the merger. Both the X-ray and radio emission likely arise from a physical process that is distinct from the one that generates the UV/optical/near-infrared emission. No ultra-high-energy gamma-rays and no neutrino candidates consistent with the source were found in follow-up searches. These observations support the hypothesis that GW170817 was produced by the merger of two neutron stars in NGC4993 followed by a short gamma-ray burst (GRB 170817A) and a kilonova/macronova powered by the radioactive decay of r-process nuclei synthesized in the ejecta

Ritmo Learning Lab - Joomajam: A usage, attitude and image study on e-learning focused on application downloading in selected areas in Metro Manila

This study sought to examine the extent to which downloadable application can be utilized to heighten learning and bonding amongst pre-school children and parents. Further it aims to understand the short fall in sales of Joomajam despite the increase in its awareness over the course of a four (4) month campaign targeted at Moms of pre-school children and to recommend ways of increasing the sales. The research then draws attention to the fact that in Philippines as of to date, 22.6 million children are still engaged in traditional learning. Technology is quickly changing in every aspect of the society and yet, parents still adhere to the century-old idea that traditional learning is still the best method for their children. When parents do not utilize technology in improving their child\u27s learning, they neglect to see the benefits of the resources available today. Smartphones and tablets according to various health experts and pediatricians can either be beneficial to the user or detrimental to one\u27s health. But with lack of proof to bolster the claims of these health experts and also due to the fact that research on the impacts of using smartphone apps and tablets are still at its early stages, it left parents confused whether the exposure of smartphone and tablets can be good or bad to their children. As researchers for Ritmo Learning Lab, the group sought out what potential problems could have affected the sales. Further investigations revealed that there was no local e-Book store. This formed a gap in the local e-Book market by not providing a business platform anyone can easily access. Moreover, the image-bashing claims by health experts contributed to the uncertainty the eBooks or apps. These factors coupled with a target niche market made it difficult for Joomajam to realize sales in the first few months and it appeared to be the major causes for Joomajam\u27s shortcoming to reach its expected output. Joomajam needs to be flexible in terms of compatibility with other operating systems. The study confirms that almost half of the respondents interviewed (32 of 76) used educational applications. Although that is roughly one-third of our respondents, the study suggests that marketing in iOS alone will not be sufficient to make the company sustainable. The study evaluates and concludes that there are numerous naturally occurring segments that Joomajam can venture with, and gain market share. It is recommended that Joomajam: 1. take advantage and be more focused on the potential market of android users 2. endorse their products to pre-schools that have no prescribed applications 3. create tangible products for the market of non-android and non-iOS users

Measurement of the B-s(0) -> J/psi K-S(0) branching fraction

The B s0→J/ψK S0 branching fraction is measured in a data sample corresponding to 0.41fb -1 of integrated luminosity collected with the LHCb detector at the LHC. This channel is sensitive to the penguin contributions affecting the sin2β measurement from B 0→J/ψK S0. The time-integrated branching fraction is measured to be B(B S0→J/ψK S0)=(1.83±0.28)×10 -5. This is the most precise measurement to date. © 2012 CERN

Addendum:Observation of double charm production involving open charm in pp collisions at √ s = 7 TeV

No abstract available

Addendum: Observation of double charm production involving open charm in pp collisions at p root s=7 TeV

Due to the distributed nature of Service-Oriented Architectures (SOA), maintaining control in a SOA environment becomes more difficult as services spread over different lines-of-business. The concept of SOA governance has emerged as a way to implement control mechanisms in a SOA. In this paper we identify a lifecycle based approach for executing SOA governance. This approach consists of defining a SOA strategy, aligning the organization, managing the service portfolio, controlling the service lifecycle, enforcing policies and managing service levels. By incorporating a maturity model in this approach, it is possible to minimize the required effort while still having sufficient governance. From a series of interviews that have been carried out we could conclude that most current SOA projects - although relatively limited in their scope - raise governance issues that need to be addressed to prevent future problems

Measurements of the branching fractions and CP asymmetries of B-+/- -> J/psi pi(+/-) and B-+/- -> psi(2S)pi(+/-) decays

A study of B ±→J/ψπ ± and B ±→ψ(2S)π ± decays is performed with data corresponding to 0.37fb -1 of proton-proton collisions at √s=7TeV. Their branching fractions are found to be B(B ±→J/ψπ ±)=(3.88±0. 11±0.15)×10 -5andB(B ±→ψ(2S) π ±)=(2.52±0.26±0.15)×10 -5,where the first uncertainty is related to the statistical size of the sample and the second quantifies systematic effects. The measured CP asymmetries in these modes are ACPJ/ψπ=0.005±0.027±0. 011andACPψ(2S)π=0.048±0.090±0.011 with no evidence of direct CP violation seen. © 2012 CERN