Classification of the hadronic decays of the Z 0 into b and c quark pairs using a neural network

Classification of the hadronic decays of the Z 0 into b and c quark pairs using a neural network

A classifier based on a feed-forward neural network has been used for separating a sample of about 123 500 selected hadronic decays of the Z 0, collected by DELPHI during 1991, into three classes according to the flavour of the original quark pair: u u+d d+s s (unresolved), c c and b b . The classif...

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Veröffentlicht in:Physics letters. B 1992, Vol.295 (3), p.383-395
Hauptverfasser: Almehed, S., Alvsvaag, S.J., Antilogus, P., Apsimon, R.J., Barring, O., Bartl, W., Bates, M.J., Baubillier, M., Berggren, M., Bertrand, D., Bozzo, M., Brown, R.C.A., Brummer, N., Camacho Rozas, A.J., Camporesi, T., Canale, V., Cao, F., Cattai, A., Cerrito, L., Chabaud, V., Charpentier, Ph, Chauveau, J., Checchia, P., Chelkov, G.A., Chrin, J.T.M., Cosmo, G., Crennell, D., Crosetti, G., Darbo, G., Delpierre, P., De Beer, M., De Min, A., Dijkstra, H., Dris, M., Eerola, P.A.-M., Ehret, R., Engel, J.-P., Fassouliotis, D., Galeazzi, G., Gaspar, C., Golovatyuk, V.M., Goobar, A., Gorski, M., Grant, A., Gumenyuk, S., Hahn, F., Haider, S., Hernandez, J.J., Hodgson, S.D., Honore, P.F., Hooper, J.E., Isenhower, D., Jarry, P., Kalkanis, G., Kalmus, G., Katsoufis, E.C., Kopf, M., Kouznetsov, O., Leder, G., Lenzen, G., Lippi, I., Lokajicek, M., Lopez Aguera, M.A., Maehlum, G., Marin, J.-C., Markou, A., Mc Cubbin, M., Mc Kay, R., Meroni, C., Monge, M.R., Navarria, F.L., Pape, L., Perevozchikov, V., Pernicka, M., Plaszczynski, S., Poropat, P., Pullia, A., Richard, F., Ridky, J., Roncagliolo, I., Rossi, U., Rovelli, T., Salt, J., Skaali, T.B., Skjevling, G., Squarcia, S., Strub, R., Theodosiou, G.E., Tyndel, M., Van Dam, P., Wehr, A., Weilhammer, P., Winter, M., Wormald, D., Wormser, G., Yepes, P., Zaitsev, A., Zalewska, A., Zavrtanik, D., Zito, M.
Format: Artikel
Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung:A classifier based on a feed-forward neural network has been used for separating a sample of about 123 500 selected hadronic decays of the Z 0, collected by DELPHI during 1991, into three classes according to the flavour of the original quark pair: u u+d d+s s (unresolved), c c and b b . The classification has been used to compute the partial widths of the Z 0 into b and c quark pairs. This gave Γ c c /Γ h = 0.151 ± 0.008 ( stat.) ± 0.041 ( syst.) , Γ b b /Γ h = 0.232±0.005 ( stat.)±0.017 ( syst.) .
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(92)91580-3