824 research outputs found
m(b) at M(Z)
No full textThe value of the quark mass at the scale defined in the renormalization scheme, , is determined using 2.8 million hadronic Z decays collected during 1992-1994 by the DELPHI detector to be, This analysis considers NLO corrections to the three-jet production rate including mass effects, and the result obtained agrees with the QCD prediction of having a running -quark mass at an energy scale equal to . This is the first time that such a measurement has been performed far above the productio
Multiplicity distributions of charged hadrons produced in (anti)neutrino-deuterium charged- and neutral-current interactions
No full textResults are presented on the multiplicity distributions of charged hadrons produced in νn, νp, {Mathematical expression} and {Mathematical expression} charged-current interactions for the hadronic energy range 2GeV≤W≤14GeV (corresponding approximately to the neutrino energy range 5GeV≤E v≤150GeV). The experimental distributions are analysed in terms of binomial distributions. With increasing hadronic energy we find a smooth transition from an ordinary binomial via Poissonian to the negative binomial function. KNO scaling holds approximately for the multiplicity distribution for the whole phase space. Data on the multiplicity distributions for neutral-current interactions are also presented. © 1989 Società Italiana di Fisica
Search for an LSP gluino at LEP with the DELPHI detector
No full textIn some supersymmetric models, the gluino ((g) over tilde) is predicted to be light and stable. In that case, it would hadronize to form R-hadrons. In these models, the missing energy signature of the lightest supersymmetric particle is no longer valid, even if R-parity is conserved. Therefore, such a gluino is not constrained by hadron collider results, which looked for the decay (g) over tilde → q (q) over bar(χ) over tilde (0)(1). Data collected by the DELPHI detector in 1994 at 91.2 GeV have been analysed to search for q (q) over bar(gg) over tilde events. No deviation from Standard Model predictions is observed and a gluino mass between 2 and 18 GeV/c(2) is excluded at the 95% confidence level in these models. Then, R-hadrons produced in the squark decays were searched for in the data collected by DELPHI at the centre-of- mass energies of 189 to 208 GeV, corresponding to an overall integrated luminosity of 609 pb(-1). The observed number of events is in agreement with the Standard Model predictions. Limits at 95% confidence level are derived on the squark masses from the excluded regions in the plane (m((q) over tilde1),m((g) over bar)): m((t) over tilde1) gt 90 GeV/c(2) and m((b) over tilde1) gt 96 GeV/c(2) for purely left squarks. m((t) over tilde1) gt 87 GeV/c(2) and m((b) over tilde1) gt 82 GeV/c(2) independent of the mixing angle
Erratum.Higgs boson searches in CP-conserving and CP-violating MSSM scenarios with the DELPHI detector
No full textErratum to: Eur. Phys. J. C 54, 1–35 (2008); doi:
10.1140/epjc/s10052-007-0506-1CICYT AEN99-0950 and AEN99-0761Abdallah, J., Abreu, P., Adam, W., Adzic, P., Albrecht, T., Alemany-Fernandez, R., Allmendinger, T., Allport, P.P., Amaldi, U., Amapane, N., Amato, S., Anashkin, E., Andreazza, A., Andringa, S., Anjos, N., Antilogus, P., Apel, W.-D., Arnoud, Y., Ask, S., Asman, B., Augustin, J.E., Augustinus, A., Baillon, P., Ballestrero, A., Bambade, P., Barbier, R., Bardin, D., Barker, G.J., Baroncelli, A., Battaglia, M., Baubillier, M., Becks, K.-H., Begalli, M., Behrmann, A., Ben-Haim, E., Benekos, N., Benvenuti, A., Berat, C., Berggren, M., Berntzon, L., Bertrand, D., Besancon, M., Besson, N., Bloch, D., Blom, M., Bluj, M., Bonesini, M., Boonekamp, M., Booth, P.S.L., Borisov, G., Botner, O., Bouquet, B., Bowcock, T.J.V., Boyko, I., Bracko, M., Brenner, R., Brodet, E., Bruckman, P., Brunet, J.M., Buschbeck, B., Buschmann, P., Calvi, M., Camporesi, T., Canale, V., Carena, F., Castro, N., Cavallo, F., Chapkin, M., Charpentier, Ph., Checchia, P., Chierici, R., Chliapnikov, P., Chudoba, J., Chung, S.U., Cieslik, K., Collins, P., Contri, R., Cosme, G., Cossutti, F., Costa, M.J., Crennell, D., Cuevas, J., D'Hondt, J., Dalmau, J., Da Silva, T., Da Silva, W., Della Ricca, G., De Angelis, A., De Boer, W., De Clercq, C., De Lotto, B., De Maria, N., De Min, A., De Paula, L., Di Ciaccio, L., Di Simone, A., Doroba, K., Drees, J., Eigen, G., Ekelof, T., Ellert, M., Elsing, M., Espirito Santo, M.C., Fanourakis, G., Fassouliotis, D., Feindt, M., Fernandez, J., Ferrer, A., Ferro, F., Flagmeyer, U., Foeth, H., Fokitis, E., Fulda-Quenzer, F., Fuster, J., Gandelman, M., Garcia, C., Gavillet, Ph., Gazis, E., Gokieli, R., Golob, B., Gomez-Ceballos, G., Goncalves, P., Graziani, E., Grosdidier, G., Grzelak, K., Guy, J., Haag, C., Hallgren, A., Hamacher, K., Hamilton, K., Haug, S., Hauler, F., Hedberg, V., Hennecke, M., Herr, H., Hoffman, J., Holmgren, S.-O., Holt, P.J., Houlden, M.A., Jackson, J.N., Jarlskog, G., Jarry, P., Jeans, D., Johansson, E.K., Johansson, P.D., Jonsson, P., Joram, C., Jungermann, L., Kapusta, F., Katsanevas, S., Katsoufis, E., Kernel, G., Kersevan, B.P., Kerzel, U., King, B.T., Kjaer, N.J., Kluit, P., Kokkinias, P., Kourkoumelis, C., Kouznetsov, O., Krumstein, Z., Kucharczyk, M., Lamsa, J., Leder, G., Ledroit, F., Leinonen, L., Leitner, R., Lemonne, J., Lepeltier, V., Lesiak, T., Liebig, W., Liko, D., Lipniacka, A., Lopes, J.H., Lopez, J.M., Loukas, D., Lutz, P., Lyons, L., MacNaughton, J., Malek, A., Maltezos, S., Mandl, F., Marco, J., Marco, R., Marechal, B., Margoni, M., Marin, J.-C., Mariotti, C., Markou, A., Martinez-Rivero, C., Masik, J., Mastroyiannopoulos, N., Matorras, F., Matteuzzi, C., Mazzucato, F., Mazzucato, M., Mc Nulty, R., Meroni, C., Migliore, E., Mitaroff, W., Mjoernmark, U., Moa, T., Moch, M., Moenig, K., Monge, R., Montenegro, J., Moraes, D., Moreno, S., Morettini, P., Mueller, U., Muenich, K., Mulders, M., Mundim, L., Murray, W., Muryn, B., Myatt, G., Myklebust, T., Nassiakou, M., Navarria, F., Nawrocki, K., Nicolaidou, R., Nikolenko, M., Oblakowska-Mucha, A., Obraztsov, V., Olshevski, A., Onofre, A., Orava, R., Osterberg, K., Ouraou, A., Oyanguren, A., Paganoni, M., Paiano, S., Palacios, J.P., Palka, H., Papadopoulou, Th.D., Pape, L., Parkes, C., Parodi, F., Parzefall, U., Passeri, A., Passon, O., Peralta, L., Perepelitsa, V., Perrotta, A., Petrolini, A., Piedra, J., Pieri, L., Pierre, F., Pimenta, M., Piotto, E., Podobnik, T., Poireau, V., Pol, M.E., Polok, G., Pozdniakov, V., Pukhaeva, N., Pullia, A., Rames, J., Read, A., Rebecchi, P., Rehn, J., Reid, D., Reinhardt, R., Renton, P., Richard, F., Ridky, J., Rivero, M., Rodriguez, D., Romero, A., Ronchese, P., Roudeau, P., Rovelli, T., Ruhlmann-Kleider, V., Ryabtchikov, D., Sadovsky, A., Salmi, L., Salt, J., Sander, C., Savoy-Navarro, A., Schwickerath, U., Sekulin, R., Siebel, M., Sisakian, A., Smadja, G., Smirnova, O., Sokolov, A., Sopczak, A., Sosnowski, R., Spassov, T., Stanitzki, M., Stocchi, A., Strauss, J., Stugu, B., Szczekowski, M., Szeptycka, M., Szumlak, T., Tabarelli, T., Taffard, A.C., Tegenfeldt, F., Timmermans, J., Tkatchev, L., Tobin, M., Todorovova, S., Tome, B., Tonazzo, A., Tortosa, P., Travnicek, P., Treille, D., Tristram, G., Trochimczuk, M., Troncon, C., Turluer, M.-L., Tyapkin, I.A., Tyapkin, P., Tzamarias, S., Uvarov, V., Valenti, G., Van Dam, P., Van Eldik, J., Van Remortel, N., Van Vulpen, I., Vegni, G., Veloso, F., Venus, W., Verdier, P., Verzi, V., Vilanova, D., Vitale, L., Vrba, V., Wahlen, H., Washbrook, A.J., Weiser, C., Wicke, D., Wickens, J., Wilkinson, G., Winter, M., Witek, M., Yushchenko, O., Zalewska, A., Zalewski, P., Zavrtanik, D., Zhuravlov, V., Zimin, N.I., Zintchenko, A., Zupan, M
Measurement of the mass and width of the W boson in e+e- collisions at s√= 161–209 GeV
No full textAbdallah, J., Abreu, P., Adam, W., Adzic, P., Albrecht, T., Alemany-Fernandez, R., Allmendinger, T., Allport, P.P., Amaldi, U., Amapane, N., Amato, S., Anashkin, E., Andreazza, A., Andringa, S., Anjos, N., Antilogus, P., Apel, W.-D., Arnoud, Y., Ask, S., Asman, B., Augustin, J.E., Augustinus, A., Baillon, P., Ballestrero, A., Bambade, P., Barbier, R., Bardin, D., Barker, G.J., Baroncelli, A., Battaglia, M., Baubillier, M., Becks, K.-H., Begalli, M., Behrmann, A., Ben-Haim, E., Benekos, N., Benvenuti, A., Berat, C., Berggren, M., Bertrand, D., Besancon, M., Besson, N., Bloch, D., Blom, M., Bluj, M., Bonesini, M., Boonekamp, M., Booth, P.S.L., Borisov, G., Botner, O., Bouquet, B., Bowcock, T.J.V., Boyko, I., Bracko, M., Brenner, R., Brodet, E., Bruckman, P., Brunet, J.M., Buschbeck, B., Buschmann, P., Calvi, M., Camporesi, T., Canale, V., Carena, F., Castro, N., Cavallo, F., Chapkin, M., Charpentier, Ph., Checchia, P., Chierici, R., Chliapnikov, P., Chudoba, J., Chung, S.U., Cieslik, K., Collins, P., Contri, R., Cosme, G., Cossutti, F., Costa, M.J., Crennell, D., Cuevas, J., D'Hondt, J., Da Silva, T., Da Silva, W., Della Ricca, G., De Angelis, A., De Boer, W., De Clercq, C., De Lotto, B., De Maria, N., De Min, A., De Paula, L., Di Ciaccio, L., Di Simone, A., Doroba, K., Drees, J., Duperrin, A., Eigen, G., Ekelof, T., Ellert, M., Elsing, M., Espirito Santo, M.C., Fanourakis, G., Fassouliotis, D., Feindt, M., Fernandez, J., Ferrer, A., Ferro, F., Flagmeyer, U., Foeth, H., Fokitis, E., Fulda-Quenzer, F., Fuster, J., Gandelman, M., Garcia, C., Gavillet, Ph., Gazis, E., Gokieli, R., Golob, B., Gomez-Ceballos, G., Goncalves, P., Graziani, E., Grosdidier, G., Grzelak, K., Guy, J., Haag, C., Hallgren, A., Hamacher, K., Hamilton, K., Haug, S., Hauler, F., Hedberg, V., Hennecke, M., Hoffman, J., Holmgren, S.-O., Holt, P.J., Houlden, M.A., Jackson, J.N., Jarlskog, G., Jarry, P., Jeans, D., Johansson, E.K., Jonsson, P., Joram, C., Jungermann, L., Kapusta, F., Katsanevas, S., Katsoufis, E., Kernel, G., Kersevan, B.P., Kerzel, U., King, B.T., Kjaer, N.J., Kluit, P., Kokkinias, P., Kourkoumelis, C., Kouznetsov, O., Krumstein, Z., Kucharczyk, M., Lamsa, J., Leder, G., Ledroit, F., Leinonen, L., Leitner, R., Lemonne, J., Lepeltier, V., Lesiak, T., Liebig, W., Liko, D., Lipniacka, A., Lopes, J.H., Lopez, J.M., Loukas, D., Lutz, P., Lyons, L., MacNaughton, J., Malek, A., Maltezos, S., Mandl, F., Marco, J., Marco, R., Marechal, B., Margoni, M., Marin, J.-C., Mariotti, C., Markou, A., Martinez-Rivero, C., Masik, J., Mastroyiannopoulos, N., Matorras, F., Matteuzzi, C., Mazzucato, F., Mazzucato, M., Mc Nulty, R., Meroni, C., Migliore, E., Mitaroff, W., Mjoernmark, U., Moa, T., Moch, M., Moenig, K., Monge, R., Montenegro, J., Moraes, D., Moreno, S., Morettini, P., Mueller, U., Muenich, K., Mulders, M., Mundim, L., Murray, W., Muryn, B., Myatt, G., Myklebust, T., Nassiakou, M., Navarria, F., Nawrocki, K., Nicolaidou, R., Nikolenko, M., Oblakowska-Mucha, A., Obraztsov, V., Olshevski, A., Onofre, A., Orava, R., Osterberg, K., Ouraou, A., Oyanguren, A., Paganoni, M., Paiano, S., Palacios, J.P., Palka, H., Papadopoulou, Th.D., Pape, L., Parkes, C., Parodi, F., Parzefall, U., Passeri, A., Passon, O., Peralta, L., Perepelitsa, V., Perrotta, A., Petrolini, A., Piedra, J., Pieri, L., Pierre, F., Pimenta, M., Piotto, E., Podobnik, T., Poireau, V., Pol, M.E., Polok, G., Pozdniakov, V., Pukhaeva, N., Pullia, A., Radojicic, D., Rames, J., Read, A., Rebecchi, P., Rehn, J., Reid, D., Reinhardt, R., Renton, P., Richard, F., Ridky, J., Rivero, M., Rodriguez, D., Romero, A., Ronchese, P., Roudeau, P., Rovelli, T., Ruhlmann-Kleider, V., Ryabtchikov, D., Sadovsky, A., Salmi, L., Salt, J., Sander, C., Savoy-Navarro, A., Schwickerath, U., Sekulin, R., Siebel, M., Simard, L., Sisakian, A., Smadja, G., Smirnova, O., Sokolov, A., Sopczak, A., Sosnowski, R., Spassov, T., Stanitzki, M., Stocchi, A., Strauss, J., Stugu, B., Szczekowski, M., Szeptycka, M., Szumlak, T., Tabarelli, T., Tegenfeldt, F., Thomas, J., Timmermans, J., Tkatchev, L., Tobin, M., Todorovova, S., Tome, B., Tonazzo, A., Tortosa, P., Travnicek, P., Treille, D., Tristram, G., Trochimczuk, M., Troncon, C., Turluer, M.-L., Tyapkin, I.A., Tyapkin, P., Tzamarias, S., Uvarov, V., Valenti, G., Van Dam, P., Van Eldik, J., Van Remortel, N., Van Vulpen, I., Vegni, G., Veloso, F., Venus, W., Verdier, P., Verzi, V., Vilanova, D., Vitale, L., Vrba, V., Wahlen, H., Washbrook, A.J., Weiser, C., Wicke, D., Wickens, J., Wilkinson, G., Winter, M., Witek, M., Yushchenko, O., Zalewska, A., Zalewski, P., Zavrtanik, D., Zhuravlov, V., Zimin, N.I., Zintchenko, A., Zupan, M
Rapidity-rank structure of p anti-p pairs in hadronic Z0 decays
No full textThe rapidity-rank structure of pp̄ pairs is used to analyze the mechanism of baryon production in hadronic Z0 decay. The relative occurrence of the rapidity-ordered configuration p M p̄, where M is a meson, and that of pp̄ adjacent pairs is compared. The data are found to be consistent with predictions from a mechanism producing adjacent-rank pp̄ pairs, without requiring 'string-ordered' p M p̄ configurations. An upper limit of 15% at 90% confidence is determined for the p M p̄ contribution. (C) 2000 Elsevier Science B.V.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Observation of orbitally excited B mesons
No full textExperimental evidence for the existence of orbitally excited B meson states is presented in an analysis of the Bπ and B*π distribution of Q = m(B**) - m(B(*)) - m(π) using Z0 decay data taken with the DELPHI detector at LEP. The mean Q-value of the decays B** → B(*)π is measured to be 284 ± 5 (stat.) ± 15 (syst.) MeV/c2, and the Gaussian width of the signal is 79 ± 5 (stat.) ± 8 (syst.) MeV/c2. This signal can be described as a single resonance of mass m = 5732 ± 5 (stat.) ± 20 (syst.) MeV/c2 and full width Γ = 145 ± 28 MeV/c2. The observed shape is also consistent with the production of several broad and narrow states as predicted by the quark model and partly observed in the D-meson sector. The production rate of B** per b-jet is found to be 0.27 ± 0.02 (stat.) ± 0.06 (syst.).0info:eu-repo/semantics/publishe
Measurement of the B-d(0) oscillation frequency using kaons, leptons and jet charge
No full textA measurement of the mass difference, Delta m(d), be tween the two physical B-d(0) states has been obtained from the analysis of the impact parameter distribution of a lepton emitted at large transverse momentum (p(t)) relative to the jet axis and from the analysis of the flight distance distribution of secondary vertices tagged by either a high p(t) lepton or an identified kaon. In the opposite hemisphere of the event, the charge of the initial quark has been evaluated using a high p(t) lepton, a charged kaon or the mean jet charge, With 1.7 million hadronic Z(0) decays recorded by DELPHI between 1991 and 1993, Delta m(d) is found to be: Delta m(d) = 0.531 (+0.050)(-0.046) (stat.) +/- 0.078 (syst.) ps(-1)
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