396 research outputs found

    Measurement of the c+ decay-asymmetry parameter

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    complete author list: Avery P.; Besson D.; Garren L.; Yelton J.; Kinoshita K.; Pipkin F.; Procario M.; Wilson R.; Wolinski J.; Xiao D.; Zhu Y.; Ammar R.; Baringer P.; Coppage D.; Davis R.; Haas P.; Kelly M.; Kwak N.; Lam H.; Ro S.; Kubota Y.; Nelson J.; Perticone D.; Poling R.; Fulton R.; Jensen T.; Johnson D.; Kagan H.; Kass R.; Morrow F.; Whitmore J.; Wilson P.; Bortoletto D.; Chen W.; Dominick J.; McIlwain R.; Miller D.; Ng C.; Schaffner S.; Shibata E.; Shipsey I.; Yao W.; Battle M.; Sparks K.; Thorndike E.; Wang C.; Alam M.; Kim I.; Li W.; Romero V.; Sun C.; Wang P.; Zoeller M.; Goldberg M.; Haupt T.; Horwitz N.; Jain V.; Mestayer M.; Moneti G.; Rozen Y.; Rubin P.; Sharma V.; Skwarnicki T.; Thulasidas M.; Zhu G.; Barnes A.; Csorna S.; Letson T.; Alexander J.; Artuso M.; Bebek C.; Berkelman K.; Browder T.; Cassel D.; Cheu E.; Coffman D.; Crawford G.; Dewire J.; Drell P.; Ehrlich R.; Galik R.; Garcia-Sciveres M.; Geiser B.; Gittelman B.; Gray S.; Halling A.; Hartill D.; Heltsley B.; Honscheid K.; Kandaswamy J.; Katayama N.; Kreinick D.; Lewis J.; Ludwig G.; Masui J.; Mevissen J.; Mistry N.; Nandi S.; Nordberg E.; Ogrady C.; Peterson D.; Pisharody M.; Riley D.; Sapper M.; Selen M.; Silverman A.; Stone S.; Worden H.; Worris M.; Sadoff A.; Avery P.; Sadoff A.; Worris M.; Worden H.; Stone S.; Silverman A.; Avery P.</p

    Goat fish resources of India with special reference to its occurrence in the shrimp trawlers at Sakthikulangara and Cochin Fisheries Harbour

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    The goatfishes or red mullets of the family Mullidae form one of the important ground fish resources along the Indian coasts. A comparative study in the catch indices points out that an annual average of 3,700 t were landed along the east coast during the period 1978—'87 accounting to more than 70% of the total goat fish landings from the seas around India. The percentage composition analysis at Cochin Fisheries. Harbour indicated highly fluctuating trend in the monthly catches were recorded and tabulated. Upeneus vittatus was the predominant species recorded in both centers during the period of observation

    Global teak resources and market assessment 2022.

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    5 S ince 2010, when FAO conducted the former “Teak Resources and Market Assessment” (TRMA 2010) as a special study of the Global Forest Resources Assessment 2010 (FRA 2010), the global teak sector has been faced with a significant data gap on the present status of global teak resources and trade. This situation was addressed at the 4th World Teak Conference (WTC) held in Accra, Ghana in September 2022 calling for an update of TRMA 2010 to improve the statistical data on teak forests and provide more reliable information on the development of teak resources, wood harvests, and international trade. IUFRO through its Special Programme for Development of Capacities (SPDC) along with FAO and TEAKNET1 have taken up this recommendation and initiated the “Global Teak Resources and Market Assessment 2022” (TRMA 2022) as a follow-up to previous projects. Earlier on, IUFRO in cooperation with FAO and ITTO published the `Global Teak Study. Analysis, Evaluation and Future Potential of Teak Resources` (2017) addressing best practices and lessons learnt on the conservation of teak genetic resources and the sustainable management of teak forests in different country contexts in Africa, Asia and Latin America. Within its scientific structure, IUFRO continues to maintain a working party on the `Utilization of Planted Teak` which aims at research and dissemination of scientific information on teak timber produced within the framework of socially and environmentally acceptable norms of sustainable forest management. The “Global Teak Resources and Market Assessment 2022” aims to present updated country level information on teak (Tectona grandis Linn.F.), which continues to be one of the most important tropical hardwood resources in the world. Teak resources were assessed in 80 countries in the tropics through a standardized questionnaire available in Chinese, English, French, Portuguese and Spanish, that was sent to qualified experts with access to the required data on teak. The experts were identified through the large professional networks of IUFRO, TEAKNET, and five regional coordina- tors, mainly from national forest research institutions, universities or forestry administrations. They were instrumental in the process of data collection and verification by managing the communication with the identified resource persons and monitor the distribution and collection of the questionnaires. Data on the international trade of teak roundwood and sawntimber have been captured from the UN COMTRADE database that publishes teak data based on official customs records since January 2022. Many planted teak forests are owned or managed by private companies, particularly in South America. It is of utmost importance to note that the resource data reported by such companies in each particular questionnaire have been aggre- gated at national level to preclude the possibility to trace the resource data back to any public or private entity within a given country. The results and findings of this report, published by IUFRO with generous support provided by the United States Forest Service, the Institute of Forest Science, Republic of Korea and the Austrian Federal Ministry of Agriculture, For- estry, Regions and Water Management will facilitate an improved assessment of the significance of teak resources and the international teak trade providing policy- and decision-makers, investors, and managers with a better understanding of the important role that teak resources are playing today in the provision of wood products for the national economies of many countries

    Search for CP Violation in the Decay Z -> b (b bar) g

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    About three million hadronic decays of the Z collected by ALEPH in the years 1991-1994 are used to search for anomalous CP violation beyond the Standard Model in the decay Z -> b \bar{b} g. The study is performed by analyzing angular correlations between the two quarks and the gluon in three-jet events and by measuring the differential two-jet rate. No signal of CP violation is found. For the combinations of anomalous CP violating couplings, h^b=h^AbgVbh^VbgAb{\hat{h}}_b = {\hat{h}}_{Ab}g_{Vb}-{\hat{h}}_{Vb}g_{Ab} and hb=h^Vb2+h^Ab2h^{\ast}_b = \sqrt{\hat{h}_{Vb}^{2}+\hat{h}_{Ab}^{2}}, limits of \hat{h}_b < 0.59and and h^{\ast}_{b} < 3.02$ are given at 95\% CL.Comment: 8 pages, 1 postscript figure, uses here.sty, epsfig.st

    Precision Measurement of the Ds+Ds+D_s^{*+}- D_s^+ Mass Difference

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    We have measured the vector-pseudoscalar mass splitting M(Ds+)M(Ds+)=144.22±0.47±0.37MeVM(D_s^{*+})-M(D_s^+) = 144.22\pm 0.47\pm 0.37 MeV, significantly more precise than the previous world average. We minimize the systematic errors by also measuring the vector-pseudoscalar mass difference M(D0)M(D0)M(D^{*0})-M(D^0) using the radiative decay D0D0γD^{*0}\rightarrow D^0\gamma, obtaining [M(Ds+)M(Ds+)][M(D0)M(D0)]=2.09±0.47±0.37MeV[M(D_s^{*+})-M(D_s^+)]-[M(D^{*0})-M(D^0)] = 2.09\pm 0.47\pm 0.37 MeV. This is then combined with our previous high-precision measurement of M(D0)M(D0)M(D^{*0})-M(D^0), which used the decay D0D0π0D^{*0}\rightarrow D^0\pi^0. We also measure the mass difference M(Ds+)M(D+)=99.5±0.6±0.3M(D_s^+)-M(D^+)=99.5\pm 0.6\pm 0.3 MeV, using the ϕπ+\phi\pi^+ decay modes of the Ds+D_s^+ and D+D^+ mesons.Comment: 18 pages uuencoded compressed postscript (process with uudecode then gunzip). hardcopies with figures can be obtained by sending mail to: [email protected]

    Observation of a New Charmed Strange Meson

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    Using the CLEO-II detector, we have obtained evidence for a new meson decaying to D0K+D^0 K^+. Its mass is 2573.21.6+1.7±0.8±0.52573.2^{+1.7}_{-1.6}\pm 0.8\pm 0.5 {}~MeV/c2c^2 and its width is 164+5±316^{+5}_{-4}\pm 3~MeV/c2c^2. Although we do not establish its spin and parity, the new meson is consistent with predictions for an L=1L=1, S=1S=1, JP=2+J_P=2^+ charmed strange state.Comment: 9 pages uuencoded compressed postscript (process with uudecode then gunzip). hardcopies with figures can be obtained by sending mail to: [email protected]

    Search for supersymmetry with a dominant R-parity violating LQDbar couplings in e+e- collisions at centre-of-mass energies of 130GeV to 172 GeV

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    A search for pair-production of supersymmetric particles under the assumption that R-parity is violated via a dominant LQDbar coupling has been performed using the data collected by ALEPH at centre-of-mass energies of 130-172 GeV. The observed candidate events in the data are in agreement with the Standard Model expectation. This result is translated into lower limits on the masses of charginos, neutralinos, sleptons, sneutrinos and squarks. For instance, for m_0=500 GeV/c^2 and tan(beta)=sqrt(2) charginos with masses smaller than 81 GeV/c^2 and neutralinos with masses smaller than 29 GeV/c^2 are excluded at the 95% confidence level for any generation structure of the LQDbar coupling.Comment: 32 pages, 30 figure

    Production and Decay of D_1(2420)^0 and D_2^*(2460)^0

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    We have investigated D+πD^{+}\pi^{-} and D+πD^{*+}\pi^{-} final states and observed the two established L=1L=1 charmed mesons, the D1(2420)0D_1(2420)^0 with mass 242122+1+22421^{+1+2}_{-2-2} MeV/c2^{2} and width 2053+6+320^{+6+3}_{-5-3} MeV/c2^{2} and the D2(2460)0D_2^*(2460)^0 with mass 2465±3±32465 \pm 3 \pm 3 MeV/c2^{2} and width 2876+8+628^{+8+6}_{-7-6} MeV/c2^{2}. Properties of these final states, including their decay angular distributions and spin-parity assignments, have been studied. We identify these two mesons as the jlight=3/2j_{light}=3/2 doublet predicted by HQET. We also obtain constraints on {\footnotesize ΓS/(ΓS+ΓD)\Gamma_S/(\Gamma_S + \Gamma_D)} as a function of the cosine of the relative phase of the two amplitudes in the D1(2420)0D_1(2420)^0 decay.Comment: 15 pages in REVTEX format. hardcopies with figures can be obtained by sending mail to: [email protected]
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