101. Evidence for the existence of the strange b-flavoured meson Bs0 in Z0 decays
- Author
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Acton, P.D., primary, Alexander, G., additional, Allison, J., additional, Allport, P.P., additional, Anderson, K.J., additional, Arcelli, S., additional, Astbury, A., additional, Axen, D., additional, Azuelos, G., additional, Bahan, G.A., additional, Baines, J.T.M., additional, Ball, A.H., additional, Banks, J., additional, Barlow, R.J., additional, Barnett, S., additional, Batley, J.R., additional, Beaudoin, G., additional, Beck, A., additional, Becker, J., additional, Behnke, T., additional, Bell, K.W., additional, Bella, G., additional, Berlich, P., additional, Bethke, S., additional, Biebel, O., additional, Binder, U., additional, Bloodworth, I.J., additional, Bock, P., additional, Boden, B., additional, Bosch, H.M., additional, Bougerolle, S., additional, Breuker, H., additional, Brown, R.M., additional, Buijs, A., additional, Burckhart, H.J., additional, Burgard, C., additional, Capiluppi, P., additional, Carnegie, R.K., additional, Carter, A.A., additional, Carter, J.R., additional, Chang, C.Y., additional, Charlton, D.G., additional, Clarke, P.E.L., additional, Cohen, I., additional, Clayton, J.C., additional, Collins, W.J., additional, Conboy, J.E., additional, Cooper, M., additional, Coupland, M., additional, Cuffiani, M., additional, Dado, S., additional, Dallavalle, G.M., additional, De Jong, S., additional, del Pozo, L.A., additional, Deng, H., additional, Dieckmann, A., additional, Dittmar, M., additional, Dixit, M.S., additional, do Couto e Silva, E., additional, Duboscq, J.E., additional, Duchovni, E., additional, Duckeck, G., additional, Duerdoth, I.P., additional, Dumas, D.J.P., additional, Elcombe, P.A., additional, Estabrooks, P.G., additional, Etzion, E., additional, Evans, H.G., additional, Fabbri, F., additional, Fincke-Keeler, M., additional, Fischer, H.M., additional, Fong, D.G., additional, Foucher, M., additional, Gaidot, A., additional, Ganel, O., additional, Gary, J.W., additional, Gascon, J., additional, McGowan, R.F., additional, Geddes, N.I., additional, Geich-Gimbel, C., additional, Gensler, S.W., additional, Gentit, F.X., additional, Giacomelli, G., additional, Gibson, V., additional, Gibson, W.R., additional, Gillies, J.D., additional, Goldberg, J., additional, Goodrick, M.J., additional, Gorn, W., additional, Grandi, C., additional, Grant, F.C., additional, Hagemann, J., additional, Hanson, G.G., additional, Hansroul, M., additional, Hargrove, C.K., additional, Harrison, P.F., additional, Hart, J., additional, Hattersley, P.M., additional, Hauschild, M., additional, Hawkes, C.M., additional, Heflin, E., additional, Hemingway, R.J., additional, Heuer, R.D., additional, Hill, J.C., additional, Hillier, S.J., additional, Hilse, T., additional, Hinshaw, D.A., additional, Hobbs, J.D., additional, Hobson, P.R., additional, Hochman, D., additional, Homer, R.J., additional, Honma, A.K., additional, Howarth, C.P., additional, Hughes-Jones, R.E., additional, Humbert, R., additional, Igo-Kemenes, P., additional, Ihssen, H., additional, Imrie, D.C., additional, Janissen, A.C., additional, Jawahery, A., additional, Jeffreys, P.W., additional, Jeremie, H., additional, Jimack, M., additional, Jobes, M., additional, Jones, R.W.L., additional, Jovanovic, P., additional, Jui, C., additional, Karlen, D., additional, Kawagoe, K., additional, Kawamoto, T., additional, Keeler, R.K., additional, Kellogg, R.G., additional, Kennedy, B.W., additional, Kluth, S., additional, Kobayashi, T., additional, Kokott, T.P., additional, Komamiya, S., additional, Köpke, L., additional, Kral, J.F., additional, Kowalewski, R., additional, von Krogh, J., additional, Kroll, J., additional, Kuwano, M., additional, Kyberd, P., additional, Lafferty, G.D., additional, Lamarche, F., additional, Layter, J.G., additional, Le Du, P., additional, Leblanc, P., additional, Lee, A.M., additional, Lehto, M.H., additional, Lellouch, D., additional, Lennert, P., additional, Leroy, C., additional, Letts, J., additional, Levegrün, S., additional, Levinson, L., additional, Lloyd, S.L., additional, Loebinger, F.K., additional, Lorah, J.M., additional, Lorazo, B., additional, Losty, M.J., additional, Lou, X.C., additional, Ludwig, J., additional, Mannelli, M., additional, Marcellini, S., additional, Maringer, G., additional, Markus, C., additional, Martin, A.J., additional, Martin, J.P., additional, Mashimo, T., additional, Mättig, P., additional, Maur, U., additional, McKenna, J., additional, McMahon, T.J., additional, McNutt, J.R., additional, Meijers, F., additional, Menszner, D., additional, Merritt, F.S., additional, Mes, H., additional, Michelini, A., additional, Middleton, R.P., additional, Mikenberg, G., additional, Mildenberger, J., additional, Miller, D.J., additional, Mir, R., additional, Mohr, W., additional, Moisan, C., additional, Montanari, A., additional, Mori, T., additional, Morii, M., additional, Mouthuy, T., additional, Nellen, B., additional, Nguyen, H.H., additional, Nozaki, M., additional, O'Neale, S.W., additional, Oakham, F.G., additional, Odorici, F., additional, Ogren, H.O., additional, Oram, C.J., additional, Oreglia, M.J., additional, Orito, S., additional, Pansart, J.P., additional, Panzer-Steindel, B., additional, Paschievici, P., additional, Patrick, G.N., additional, Paz-Jaoshvili, N., additional, Pfister, P., additional, Pilcher, J.E., additional, Pitman, D., additional, Plane, D.E., additional, Poffenberger, P., additional, Poli, B., additional, Pouladdej, A., additional, Prebys, E., additional, Pritchard, T.W., additional, Przysiezniak, H., additional, Quast, G., additional, Redmond, M.W., additional, Rees, D.L., additional, Richards, G.E., additional, Robinson, D., additional, Rollnik, A., additional, Roney, J.M., additional, Ros, E., additional, Rossberg, S., additional, Rossi, A.M., additional, Rosvick, M., additional, Routenburg, P., additional, Runge, K., additional, Runolfsson, O., additional, Rust, D.R., additional, Sasaki, M., additional, Sbarra, C., additional, Schaile, A.D., additional, Schaile, O., additional, Schappert, W., additional, Scharff-Hansen, P., additional, Schenk, P., additional, von der Schmitt, H., additional, Schreiber, S., additional, Schwick, C., additional, Schwiening, J., additional, Scott, W.G., additional, Settles, M., additional, Shears, T.G., additional, Shen, B.C., additional, Shepherd-Themistocleous, C.H., additional, Sherwood, P., additional, Shypit, R., additional, Simon, A., additional, Singh, P., additional, Siroli, G.P., additional, Skuja, A., additional, Smith, A.M., additional, Smith, T.J., additional, Snow, G.A., additional, Sobie, R., additional, Springer, R.W., additional, Sproston, M., additional, Stephens, K., additional, Steuerer, J., additional, Ströhmer, R., additional, Strom, D., additional, Takeshita, T., additional, Taras, P., additional, Tarem, S., additional, Tecchio, M., additional, Teixeira-Dias, P., additional, Tesch, N., additional, Thackray, N.J., additional, Transtromer, G., additional, Tresilian, N.J., additional, Tsukamoto, T., additional, Turner, M.F., additional, Tysarczyk-Niemeyer, G., additional, Van den plas, D., additional, Van Kooten, R., additional, VanDalen, G.J., additional, Vasseur, G., additional, Virtue, C.J., additional, Wagner, A., additional, Wagner, D.L., additional, Wahl, C., additional, Walker, J.P., additional, Ward, C.P., additional, Ward, D.R., additional, Watkins, P.M., additional, Watson, A.T., additional, Watson, N.K., additional, Weber, M., additional, Weber, P., additional, Weisz, S., additional, Wells, P.S., additional, Wermes, N., additional, Whalley, M.A., additional, Wilson, G.W., additional, Wilson, J.A., additional, Winterer, V.-H., additional, Wlodek, T., additional, Wotton, S., additional, Wyatt, T.R., additional, Yaari, R., additional, Yeaman, A., additional, Yekutieli, G., additional, Yurko, M., additional, Zeuner, W., additional, and Zorn, G.T., additional
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per hadronic event. Predictions of JETSET for cross sections and total rates agree very well for π!["]("/fulltext-image.asp?format=htmlnonpaginated&src=N86RG8254NMW14PR_html\10052_2005_Article_BF01411010_TeX2GIFIE3.gif")
rates are overestimated. Combined with data of other particle species there is evidence that the peak positions in the ξ=ln(1/x!["]("/fulltext-image.asp?format=htmlnonpaginated&src=HP26UG5347063V12_html\10052_2005_Article_BF01411011_TeX2GIFIE1.gif")
p experiments), which we have applied to hadronic events recorded using the OPAL detector at LEP. Comparisons are made between jets defined with the cone algorithm and jets found by the “JADE” and “Durham” jet finders usually used ine!["]("/fulltext-image.asp?format=htmlnonpaginated&src=K7H2333UJ8878N7H_html\10052_2005_Article_BF01571874_TeX2GIFIE1.gif")
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decays. To reduce the systematic error on the measurement of the !["]("/fulltext-image.asp?format=htmlnonpaginated&src=P701672423106JR3_html\10052_2005_Article_BF01571301_TeX2GIFIE4.gif")
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event tagging was obtained from the data by comparing the numbers of events having a bottom signature in either one or both thrust hemispheres. A value of $$\frac{{\Gamma (Z^0 \to b\bar b)}}{{\Gamma (Z^0 \to hadrons)}} = 0.2171 \pm 0.0021 \pm 0.0021$$ was obtained, where the first error is statistical and the second systematic. The uncertainty on the decay width !["]("/fulltext-image.asp?format=htmlnonpaginated&src=P701672423106JR3_html\10052_2005_Article_BF01571301_TeX2GIFIE6.gif")
is not included in these errors. A fractional variation of this width by ±8% about its Standard Model prediction would result in a variation of the measured !["]("/fulltext-image.asp?format=htmlnonpaginated&src=P701672423106JR3_html\10052_2005_Article_BF01571301_TeX2GIFIE7.gif")
fraction of ±0.0015. !["]("/fulltext-image.asp?format=htmlnonpaginated&src=H840081PR7910M1Q_html\10052_2005_Article_BF01571300_TeX2GIFIE1.gif")
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events are compared to those for all flavours using secondary vertex information to tag the b quarks. The measured distributions are found to be well described by anO"(α!["]("/fulltext-image.asp?format=htmlnonpaginated&src=P0X891426810051Q_html\10052_2005_Article_BF01558285_TeX2GIFIE2.gif")
, is determined from a study of 15 different observables in hadronicZ!["]("/fulltext-image.asp?format=htmlnonpaginated&src=P0X891426810051Q_html\10052_2005_Article_BF01558285_TeX2GIFIE3.gif")
in. The error is dominated by the theoretical uncertainties. Application of recent calculations which include the resummation of leading and next-to-leading logarithms to all orders for some observables confirm this result with a reduced sensitivity to renormalization scale variations. TheZ!["]("/fulltext-image.asp?format=htmlnonpaginated&src=P0X891426810051Q_html\10052_2005_Article_BF01558285_TeX2GIFIE4.gif")
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, respectively, in. These measurements and their uncertainties are entirely independent of each other and from event shape and jet observables; the good agreement of the resulting α!["]("/fulltext-image.asp?format=htmlnonpaginated&src=J7273J6Q04515MR6_html\10052_2005_Article_BF01566648_TeX2GIFIE2.gif")
=0.122±0.010, taking into account only the statistical and experimental systematic errors. It is found that an abelian model of the strong interaction does not describe the data. The comparison of the total yield and the jet rates with QCD shower programs shows better agreement with the ARIADNE model than with the JETSET model. Both programs are found to describe well the photon properties and the properties of the residual hadronic event. !["]("/fulltext-image.asp?format=htmlnonpaginated&src=T6G24400428V617M_html\10052_2005_Article_BF01555834_TeX2GIFIE2.gif")
and the error includes the uncertainty in this choice of scale. The present measurement complements previous determinations using theO(!["]("/fulltext-image.asp?format=htmlnonpaginated&src=Q542QV8M29TP449U_html\10052_2005_Article_BF01553012_TeX2GIFIE2.gif")
events in hadronicZ!["]("/fulltext-image.asp?format=htmlnonpaginated&src=Q542QV8M29TP449U_html\10052_2005_Article_BF01553012_TeX2GIFIE3.gif")
decays was obtained by requiring the presence of an electron or muon with high momentum and high momentum component transverse to the associated hadronic jet. After accounting for backgrounds and acceptances, a value of $$\frac{{\Gamma ({\rm Z}^0 \to b\bar b)}}{{\Gamma ({\rm Z}^0 \to hadrons)}} = 0.220 \pm 0.002 \pm 0.0006 \pm 0.011$$ was obtained. The first two errors reflect the data statistics and the systematic uncertainties arising from detector modelling uncertainties, respectively. The third error includes systematic effects fromb andc fragmentation and decay uncertainties. !["]("/fulltext-image.asp?format=htmlnonpaginated&src=R6V07L351RJ00803_html\10052_2005_Article_BF01413097_TeX2GIFIE1.gif")
close to theZ