Measurement of the Ds lifetime

We report precise measurement of the Ds meson lifetime. The data were taken by the SELEX experiment (E781) spectrometer using 600 GeV/c Sigma-, pi- and p beams. The measurement has been done using 918 reconstructed Ds. The lifetime of the Ds is measured to be 472.5 +- 17.2 +- 6.6 fs, using K*(892)0K+- and phi pi+- decay modes. The lifetime ratio of Ds to D0 is 1.145+-0.049.Comment: 5 pages, 2 figures submitted to Phys. Lett.

Confirmation of the Double Charm Baryon Xi_cc+ via its Decay to p D+ K-

We observes a signal for the double charm baryon Xi_cc+ in the charged decay mode Xi_cc+ -> p D+ K- to complement the previously reported decay Xi_cc+ -> Lambda_c K- pi+ in data from SELEX, the charm hadro-production experiment (E781) at Fermilab. In this new decay mode we observe an excess of 5.62 events over an expected background estimated by event mixing to be 1.38+/-0.13 events. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4E-4. The observed mass of this state is (3518+/-3)MeV/c^2, consistent with the published result. Averaging the two results gives a mass of (3518.7+/-1.7)MeV/c^2. The observation of this new weak decay mode confirms the previous SELEX suggestion that this state is a double charm baryon. The relative branching ratio Gamma(Xi_cc+ -> pD+K-)/Gamma(Xi_cc+ -> Lambda_c K- pi+) = 0.36+/-0.21.Comment: 11 pages, 6 included eps figures. v2 includes improved statistical method to determine significance of observation. Submitted to PL

Hadronic Production of Lambda_c from 600 GeV/c pion, sigma and proton beams

We present data from Fermilab experiment E781 (SELEX) on the hadroproduction asymmetry for anti-Lambda_c compared to Lambda_c+ as a function of xF and pt2 distributions for Lambda_c+. These data were measured in the same apparatus using incident pi-, sigma- beams at 600 GeV/c and proton beam at 540 GeV/c. The asymmetry is studied as a function of xF. In the forward hemisphere with xF >= 0.2 both baryon beams exhibit very strong preference for producing charm baryons rather than charm antibaryons, while the pion beam asymmetry is much smaller. In this energy regime the results show that beam fragments play a major role in the kinematics of Lambda_c formation, as suggested by the leading quark picture.Comment: 6 pages, 5 figures (postscript), RevTeX, submitted to Phy. Rev. Let

First Observation of the Cabibbo-suppressed Decays Xi_c+ -> Sigma+ pi- pi+ and Xi_c+ -> Sigma- pi+ pi+ and Measurement of their Branching Ratios

We report the first observation of two Cabibbo-suppressed decay modes, Xi_c+ -> Sigma+ pi- pi+ and Xi_c+ -> Sigma- pi+ pi+. We observe 59+/-14 over a background of 87, and 22+/-8 over a background of 13 events, respectively, for the signals. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600GeV/c Sigma- beam. The branching ratios of the decays relative to the Cabibbo--favored Xi_c+ -> Xi- pi+ pi+ are measured to be B(Xi_c+ -> Sigma+ pi- pi+)/B(Xi_c+ -> Xi- pi+ pi+) = 0.48+/-0.20, and B(Xi_c+ -> Sigma- pi+ pi+)/B(Xi_c+ -> Xi- pi+ pi+) = 0.18+/-0.09, respectively. We also report branching ratios for the same decay modes of the Lambda_c+ relative to Lambda_c+ -> p K- pi+.Comment: 15 pages, 5 figures, version 2 as accepted in PL

Total Cross Section Measurements With π- , Σ- And Protons On Nuclei And Nucleons Around 600 Gev/c

Total cross sections for Σ- and π- on beryllium, carbon, polyethylene and copper as well as total cross sections for protons on beryllium and carbon have been measured in a broad momentum range around 600GeV/c . These measurements were performed with a transmission technique in the SELEX hyperon-beam experiment at Fermilab. We report on results obtained for hadron-nucleus cross sections and on results for σtot(Σ-N) and σtot(π-N) , which were deduced from nuclear cross sections. © 2000 Elsevier Science B.V.57901/02/15277312Langland, J.L., (1995) Ph.D. Thesis, , University of IowaKleinfelder, S.A., (1988) IEEE Trans. Nucl. Sci., 35 (1)Dersch, U., (1998) Ph.D. Thesis, HeidelbergBiagi, S.F., (1981) Nucl. Phys. B, 186, pp. 1-21Bellettini, G., (1966) Nucl. Phys., 79, pp. 609-624Schiz, A.M., (1980) Phys. Rev. D, 21, pp. 3010-3022Murthy, P.V.R., (1975) Nucl. Phys. B, 92, pp. 269-308Caso, C., (1998) Eur. Phys. J. C, 3. , http://pdg.lbl.gov/1998/contents_plots.html, and data on total cross sections from computer readable filesSchiz, A.M., (1979) Ph.D. Thesis, , Yale University(1973) Landolt Börnstein Tables, 7. , Springer editionEngler, J., (1970) Phys. Lett. B, 32, pp. 716-719Babaev, A., (1974) Phys. Lett. B, 51, pp. 501-504Glauber, R.J., (1959) Boulder Lectures, pp. 315-413Franco, V., (1972) Phys. Rev. C, 6, pp. 748-757Karmanov, V.A., Kondratyuk, L.A., (1973) JETP Lett., 18, pp. 266-268Burq, J.P., (1983) Nucl. Phys. B, 217, pp. 285-335Gross, D., (1978) Phys. Rev. Lett., 41, pp. 217-220Beznogikh, G.G., (1972) Phys. Lett. B, 39, pp. 411-413Vorobyov, A.A., (1972) Phys. Lett. B, 41, pp. 639-641Foley, K.J., (1967) Phys. Rev. Lett., 19, pp. 857-859Fajardo, L.A., (1981) Phys. Rev. D, 24, pp. 46-65Jenni, P., (1977) Nucl. Phys. B, 129, pp. 232-252Breedon, R.E., (1989) Phys. Rev. Lett. B, 216, pp. 459-465Amos, N., (1983) Phys. Rev. Lett. B, 128, pp. 343-348Amaldi, U., (1977) Phys. Rev. Lett. B, 66, pp. 390-394Amos, N., (1985) Nucl. Phys. B, 262, pp. 689-714Akopin, V.D., (1977) Sov. J. Nucl. Phys., 25, pp. 51-55Amirkhanov, I.V., (1973) Sov. J. Nucl. Phys., 17, pp. 636-637Foley, K.J., (1969) Phys. Rev., 181, pp. 1775-1793Apokin, V.D., (1976) Nucl. Phys. B, 106, pp. 413-429Burq, J.P., (1982) Phys. Lett. B, 109, pp. 124-127Dakhno, L.G., (1983) Sov. J. Nucl. Phys., 37, pp. 590-598Kazarinov, M., (1976) Sov. Phys. JETP, 43, pp. 598-606De Jager, C.W., (1974) At. Data Nucl. Data Tables, 14, pp. 479-508Donnachie, A., Landshoff, P.V., (1992) Phys. Lett. B, 296, pp. 227-232Lipkin, H., (1975) Phys. Rev. D, 11, pp. 1827-1831Barnett, R.M., (1996) Phys. Rev. D, 54, pp. 191-192Carroll, A.S., (1979) Phys. Lett. B, 80, pp. 423-427Badier, J., (1972) Phys. Lett. B, 41, pp. 387-39

Total Cross Section Measurements with pi-, Sigma- and Protons on Nuclei and Nucleons around 600 GeV/c

Total cross sections for Sigma- and pi- on beryllium, carbon, polyethylene and copper as well as total cross sections for protons on beryllium and carbon have been measured in a broad momentum range around 600GeV/c. These measurements were performed with a transmission technique adapted to the SELEX hyperon-beam experiment at Fermilab. We report on results obtained for hadron-nucleus cross sections and on results for sigma_tot(Sigma- N) and sigma_tot(pi- N), which were deduced from nuclear cross sections.Comment: 42 pages, submitted to Nucl.Phys.

Training Conditions Of Brazilian Gymnasts Who Participated In The Olympic Games (1980-2004) [condições Dos Treinamentos De Ginastas Brasileiras Participantes De Jogos Olímpicos (1980-2004)]

This paper aims to register and analyze the training facilities used by the Brazilian gymnasts who participated in the Olympic Games (1980-2004), in order to reflect upon this aspect of Female Artistic Gymnastics. To achieve this goal, we developed a qualitative research study using the Oral History method. Based on a cross-sectional analysis of the testimonials given by ten gymnasts who took part in this survey, we observed that training facilities have improved since the 90's, when Ucranian coaches were hired, a permanent Brazilian team was established and investments were made on equipment and training facilities. Despite the positive changes we have witnessed in this sport in the past years, all gymnasts who participated in the study reported that they had to practice in inappropriate training facilities at some point.184757769Arkaev, L.I., Suchilin, N.G., (2004) Gymnastics: How to Create Champions, , Oxford: Meyer & Meyer SportBortoleto, M.A.C., (2004) La Lógica Interna de la Gimnasia Artística Masculina (GAM) y Estudio Etnográfico de un Gimnasio de Alto Redimiento., p. 668. , Tese (Doutorado em Educação Física). Instituto Nacional de Educación Física, Universitat de Lleida, Lleida, Espanha 2004Carvalho, S.I., (2007) O Discurso Midiático da Ginástica Artística., p. 102. , Dissertação (Mestrado em Educação Física) - Universidade Católica de Brasília, Brasília 2007De Bosscher, V., De Knop, P., Van Bottenburg, M., Shibli, S., Bingham, J., Explaining international sporting success: An international comparison of elite sport systems and policies in six countries (2009) Sport Management Review, 12 (3), pp. 113-136. , SydneyDigel, H., The context of talent identification and promotion: A comparison of nations (2002) New Studies in Athletics, 17 (3-4), pp. 13-26http://www.eis2win.co.uk/pages/news_searchbeginsfornewnationaldirector. aspx, ENGLISH INSTITUTE OF SPORT. Acesso em: 12 nov. 2008Laville, C., Dionne, J., (1999) A Construção Do Saber: Manual de Metodologia da Pesquisa em Ciências Humanas, , Porto Alegre: Artes Médicas SulMeihy, J.C.S.B., (2005) Manual de História Oral. 5a, , ed. São Paulo: LoyolaNunomura, M., Oliveira, M.S., Centro de excelência e ginástica artística feminina: a perspectiva dos técnicos brasileiros (2012) Motriz, 18 (2), pp. 378-392. , Rio Claro, abr./junOliveira, M.S., Bortoleto, M.A.C., A ginástica artística masculina brasileira no panorama mundial competitivo (1987-2008) Motriz, 15 (2), pp. 297-309. , Rio Claro, abr/jun 2009Portelli, A., O que faz a história oral diferente (1997) Projeto História (PUC-SP), 14, p. 1997. , São PauloQueiroz, M.I.P., (1988) Relatos Orais: Do Ïndivizível "ao " Divizível ", pp. 14-43. , SIMSON, O. R. M. (org.). Experimentos com histórias de vida (Itália-Brasil). São Paulo: Vértice, Editora dos TribunaisRIO2016. Requerimentos técnicos - treinamento. Esportes olímpicos e paraolímpicos. Rio de Janeiro, 2011Ruiz, J.I.O., (1999) Metodología de la Investigación Cualitativa, , Segunda Edição. Bilbao: Universidade de DeustoSchiavon, L.M., (2009) Ginástica Artística Feminina e História Oral: A Formação Desportiva de Atletas Brasileiras Participantes de Jogos Olímpicos (1980-2004)., p. 379. , http://cutter.unicamp.br/document/?code=000439200, Tese (Doutorado em Educação Física) Faculdade de Educação Física Universidade Estadual de Campinas, Campinas-SP 2009 Disponível em. Acesso em: 31 jul. 2012Simson, O.R.M., (1988) Experimentos com histórias de vida (Itália-Brasil), , São Paulo: Vértice, Editora dos TribunaisSimson, O.R.M., (2006) A Arte de Recriar O Passado: A Metodologia da História Oral e Suas Contribuições À Promoção Do Envelhecimento Bem Sucedido, , Neri, A. (org.). Desenvolvimento e envelhecimento: perspectives biológicas, psicológicas e sociológicas. Campinas-SP: PrósSmoleuskiy, V., Gaverdouskiy, I., (1996) Tratado General de Gimnasia Artística Deportiva, , Barcelona: PaidotriboStill, C., (1993) Manual de Gimnasia Artística Femenina, , Barcelona: Editorial PaidotriboThompson, P., (1992) História Oral: A Voz Do Passado. 3a. Ed, , Rio de Janeiro: Paz e TerraZakharov, A., Gomes, A.C., (2003) Ciência Do Treinamento Desportivo. 2a. Ed, , Rio de Janeiro: Grupo Palestra Spor