80,327 research outputs found
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Earthenware Weight
No full textThis English traders' earthenware 7-lb. weight was given to the National Bureau of Standards in 1965 by William J. Owen, Chief Inspector of Weights and Measures, Bradford, England. It represents the Imperial clove or half-stone, with a mass of 7 avoirdupois pounds or 7,000 grains troy and was legalized by the Act of 1878. The clove, the stone, the quarter (2 stone) and the hundred-weight (8 stone) were widely used in England in Elizabethan times. It was in use between 1878 and 1907 but, according to Owen, "became obsolete in 1907 by virtue of legislation forbidding use of earthenware."12 x 13 x 13 c
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Mancur Balance
No full textThis compact C-form spring balance with a capacity of 4 stone (56 lb. avoirdupois) was given to the National Bureau of Standards in 1965 by William J. Owen, Chief Inspector of Weights and Measures, Bradford, England. He described it as an early example, dating to around 1840, of a type usually carried by farmers
Testing protoplanetary disc dispersal with radio emission
No full textWe consider continuum free–free radio emission from the upper atmosphere of protoplanetary discs as a probe of the ionized luminosity impinging upon the disc. Making use of previously computed hydrodynamic models of disc photoevaporation within the framework of extreme-ultraviolet (EUV) and X-ray irradiation, we use radiative transfer post-processing techniques to predict the expected free–free emission from protoplanetary discs. In general, the free–free luminosity scales roughly linearly with ionizing luminosity in both EUV- and X-ray-driven scenarios, where the emission dominates over the dust tail of the disc and is partial optically thin at cm wavelengths. We perform a test observation of GM Aur at 14–18?GHz and detect an excess of radio emission above the dust tail to a very high level of confidence. The observed flux density and spectral index are consistent with free–free emission from the ionized disc in either the EUV- or the X-ray-driven scenario. Finally, we suggest a possible route to testing the EUV- and X-ray-driven dispersal model of protoplanetary discs, by combining observed free–free flux densities with measurements of mass-accretion rates. On the point of disc dispersal one would expect to find an M?2? scaling with free–free flux in the case of EUV-driven disc dispersal or an ?* scaling in the case of X-ray-driven disc dispersa
Introduction: Illiberal peace and authoritarian conflict management: Empirical and theoretical contexts
No full textThis is the author accepted manuscript. The final version is available from Rowman & Littlefield International via the ISBN in this record
Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays
No full textThis Letter reports a measurement of the CP violation observables SJ/ψK0S and CJ/ψK0S in the decay channel B0→J/ψK0S performed with 1.0 fb−1 of pp collisions at s√=7 TeV collected by the LHCb experiment. The fit to the data yields SJ/ψK0S=0.73±0.07(stat)±0.04(syst) and CJ/ψK0S=0.03±0.09(stat)±0.01(syst). Both values are consistent with the current world averages and within
expectations from the Standard Model
Roderick Sterling Owen
No full textPortrait of Roderick Sterling Owen. R. S. Owen was baptized in 1883 by Elder J. H. [Joseph Harvey] Waggoner. At the time, Owen had been studying to become a lawyer. Moved by Adventist teachings, Owen decided to give up law and become an ordained minister in the Seventh-day Adventist Church. Owen married Anna M. Hess on April 5, 1881 and had four children: George Willmarine (1882- 1965), Almira "Allie" Ruth (1884-1973), Brownie Roderick (1886-1972), and Grace M. (1891-1929). Shortly thereafter, Owen engaged in missionary work in San Francisco for two years. In 1887, he started teaching Bible and History at Healdsburg College. He was late elected president of Healdsburg College where he served ten years. Owen also taught Bible and History at San Fernando Academy from 1903 until 1908. In 1909, he started teaching Bible at the College of Medical Evangelists (now Loma Linda University) until his death in 1927.20 x 25 c
Interview with Ray David Owen
No full textInterview with Ray Owen, Professor of Biology at Caltech, conducted by Rachel Prud'homme in 1983. The interview covers Owen's early life growing up in Wisconsin, where he attended the University of Wisconsin, studying cattle genetics with C. Stormont; his early research on chimerism in twin calves and on immunological tolerance. In 1946 he joins the biology division faculty at Caltech in genetics as a Gosney Fellow. Recollections of genetics at Caltech following World War II: concurrent arrivals include G. W. Beadle, N. Horowitz, H. Mitchell, and L. DuBridge. Recalls T. H. Morgan's reputation and his colleagues A. H. Sturtevant and S. Emerson. Other members of the biology division at this time include C. Bridges, H. J. Muller, H. Borsook, A. Haagen-Smit, C. Wiersma, A. van Harrevelt, and F. Went. Recollections of L. Pauling. His book, General Genetics, with A. Srb published in 1952. His work with D. Lindsley on bone marrow transplantation. At Caltech, involvement with freshman admissions. In 1961 becomes biology division chair. Discusses teaching and further work in student affairs, including admission and recruitment of women, the Committee on the Freshman Year, and pass/fail grading. Appointment in 1975 to dean of students and vice-president for student affairs. Involvement with National Cancer Program (1972-1975) and continuing research on immunological tolerance. Concludes with observations on genetic engineering and safety of genetics research
Biomechanical testing of implant free wedge shaped bone block fixation for bone patellar tendon bone anterior cruciate ligament reconstruction in a bovine model
No full textCharles A Willis-Owen, Trevor C Hearn, Gregory C Keene, John J Cost
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