Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Determination of A(FB)(b) at the Z pole using inclusive charge reconstruction and lifetime tagging

Abdallah, J ; Abreu, P ; Adam, W ; Adzic, P ; Albrecht, T ; Alderweireld, T ; Alemany-Fernandez, R ; Allmendinger, T ; Allport, PP and Amaldi, U , et al. (2005) In European Physical Journal C. Particles and Fields 40(1). p.1-25
Abstract
A novel high precision method measures the b-quark forward-backward asymmetry at the Z pole on a sample of 3,560,890 hadronic events collected with the DELPHI detector in 1992 to 2000. An enhanced impact parameter tag provides a high purity b sample. For event hemispheres with a reconstructed secondary vertex the charge of the corresponding quark or anti-quark is determined using a neural network which combines in an optimal way the full available charge information from the vertex charge, the jet charge and from identified leptons and hadrons. The probability of correctly identifying b-quarks and anti-quarks is measured on the data themselves comparing the rates of double hemisphere tagged like-sign and unlike-sign events. The b-quark... (More)
A novel high precision method measures the b-quark forward-backward asymmetry at the Z pole on a sample of 3,560,890 hadronic events collected with the DELPHI detector in 1992 to 2000. An enhanced impact parameter tag provides a high purity b sample. For event hemispheres with a reconstructed secondary vertex the charge of the corresponding quark or anti-quark is determined using a neural network which combines in an optimal way the full available charge information from the vertex charge, the jet charge and from identified leptons and hadrons. The probability of correctly identifying b-quarks and anti-quarks is measured on the data themselves comparing the rates of double hemisphere tagged like-sign and unlike-sign events. The b-quark forward-backward asymmetry is determined from the differential asymmetry, taking small corrections due to hemisphere correlations and background contributions into account. The results for different centre-of-mass energies are: A(FB)(b) ( 89.449 GeV) = 0.0637 +/- 0.0143( stat.) +/- 0.0017( syst.), A(FB)(b) ( 91.231 GeV) = 0.0958 +/- 0.0032( stat.) +/- 0.0014( syst.), A(FB)(b) ( 92.990 GeV) = 0.1041 +/- 0.0115( stat.) +/- 0.0024( syst.). Combining these results yields the b-quark pole asymmetry A(FB)(b0) = 0.0972 +/- 0.0030( stat.) +/- 0.0014( syst.). (Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; and (Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C. Particles and Fields
volume
40
issue
1
pages
1 - 25
publisher
Springer
external identifiers
  • wos:000231122200001
  • scopus:15544372212
ISSN
1434-6044
DOI
10.1140/epjc/s2004-02104-0
language
English
LU publication?
yes
id
e9ec4249-8e75-43e0-8d09-6be4c20946e2 (old id 227546)
date added to LUP
2016-04-01 15:40:48
date last changed
2023-01-04 18:36:21
@article{e9ec4249-8e75-43e0-8d09-6be4c20946e2,
  abstract     = {{A novel high precision method measures the b-quark forward-backward asymmetry at the Z pole on a sample of 3,560,890 hadronic events collected with the DELPHI detector in 1992 to 2000. An enhanced impact parameter tag provides a high purity b sample. For event hemispheres with a reconstructed secondary vertex the charge of the corresponding quark or anti-quark is determined using a neural network which combines in an optimal way the full available charge information from the vertex charge, the jet charge and from identified leptons and hadrons. The probability of correctly identifying b-quarks and anti-quarks is measured on the data themselves comparing the rates of double hemisphere tagged like-sign and unlike-sign events. The b-quark forward-backward asymmetry is determined from the differential asymmetry, taking small corrections due to hemisphere correlations and background contributions into account. The results for different centre-of-mass energies are: A(FB)(b) ( 89.449 GeV) = 0.0637 +/- 0.0143( stat.) +/- 0.0017( syst.), A(FB)(b) ( 91.231 GeV) = 0.0958 +/- 0.0032( stat.) +/- 0.0014( syst.), A(FB)(b) ( 92.990 GeV) = 0.1041 +/- 0.0115( stat.) +/- 0.0024( syst.). Combining these results yields the b-quark pole asymmetry A(FB)(b0) = 0.0972 +/- 0.0030( stat.) +/- 0.0014( syst.).}},
  author       = {{Abdallah, J and Abreu, P and Adam, W and Adzic, P and Albrecht, T and Alderweireld, T and Alemany-Fernandez, R and Allmendinger, T and Allport, PP and Amaldi, U and Amapane, N and Amato, S and Anashkin, E and Andreazza, A and Andringa, S and Anjos, N and Antilogus, P and Apel, WD and Arnoud, Y and Ask, Stefan and Asman, B and Augustin, JE and Augustinus, A and Baillon, P and Ballestrero, A and Bambade, P and Barbier, R and Bardin, D and Barker, G and Baroncelli, A and Battaglia, M and Baubillier, M and Becks, KH and Begalli, M and Behrmann, A and Ben-Haim, E and Benekos, N and Benvenuti, A and Berat, C and Berggren, M and Berntzon, L and Bertrand, D and Besancon, M and Besson, N and Bloch, D and Blom, M and Bluj, M and Bonesini, M and Boonekamp, M and Booth, PSL and Borisov, G and Botner, O and Bouquet, B and Bowcock, TJV and Boyko, I and Bracko, M and Brenner, R and Brodet, E and Bruckman, P and Brunet, JM and Buschmann, P and Calvi, M and Camporesi, T and Canale, V and Carena, F and Castro, N and Cavallo, F and Chapkin, M and Charpentier, P and Checchia, P and Chierici, R and Chliapnikov, P and Chudoba, J and Chung, SU and Cieslik, K and Collins, P and Contri, R and Cosme, G and Cossutti, F and Costa, MJ and Crennell, D and Cuevas, J and D'Hondt, J and Dalmau, J and da Silva, T and Da Silva, W and Della Ricca, G and De Angelis, A and De Boer, W and De Clercq, C and De Lotto, B and De Maria, N and De Min, A and de Paula, L and Di Ciaccio, L and Di Simone, A and Doroba, K and Drees, J and Dris, M and Eigen, G and Ekelof, T and Ellert, M and Elsing, M and Santo, MCE and Fanourakis, G and Fassouliotis, D and Feindt, M and Fernandez, J and Ferrer, A and Ferro, F and Flagmeyer, U and Foeth, H and Fokitis, E and Fulda-Quenzer, F and Fuster, J and Gandelman, M and Garcia, C and Gavillet, P and Gazis, E and Gokieli, R and Golob, B and Gomez-Ceballos, G and Goncalves, P and Graziani, E and Grosdidier, G and Grzelak, K and Guy, J and Haag, C and Hallgren, A and Hamacher, K and Hamilton, K and Haug, S and Hauler, F and Hedberg, Vincent and Hennecke, M and Herr, H and Hoffman, J and Holmgren, SO and Holt, PJ and Houlden, MA and Hultqvist, K and Jackson, JN and Jarlskog, Göran and Jarry, P and Jeans, D and Johansson, EK and Johansson, PD and Jonsson, P and Joram, C and Jungermann, L and Kapusta, F and Katsanevas, S and Katsoufis, E and Kernel, G and Kersevan, BP and Kerzel, U and Kiiskinen, A and King, BT and Kjaer, NJ and Kluit, P and Kokkinias, P and Kourkoumelis, C and Kouznetsov, O and Krumstein, Z and Kucharczyk, M and Lamsa, J and Leder, G and Ledroit, F and Leinonen, L and Leitner, R and Lemonne, J and Lepeltier, V and Lesiak, T and Liebig, W and Liko, D and Lipniacka, A and Lopes, JH and Lopez, JM and Loukas, D and Lutz, P and Lyons, L and MacNaughton, J and Malek, A and Maltezos, S and Mandl, F and Marco, J and Marco, R and Marechal, B and Margoni, M and Marin, JC and Mariotti, C and Markou, A and Martinez-Rivero, C and Masik, J and Mastroyiannopoulos, N and Matorras, F and Matteuzzi, C and Mazzucato, F and Mazzucato, M and Mc Nulty, R and Meroni, C and Migliore, E and Mitaroff, W and Mjörnmark, Ulf and Moa, T and Moch, M and Moenig, K and Monge, R and Montenegro, J and Moraes, D and Moreno, S and Morettini, P and Mueller, U and Muenich, K and Mulders, M and Mundim, L and Murray, W and Muryn, B and Myatt, G and Myklebust, T and Nassiakou, M and Navarria, F and Nawrocki, K and Nicolaidou, R and Nikolenko, M and Oblakowska-Mucha, A and Obraztsov, V and Olshevski, A and Onofre, A and Orava, R and Osterberg, K and Ouraou, A and Oyanguren, A and Paganoni, M and Paiano, S and Palacios, JP and Palka, H and Papadopoulou, TD and Pape, L and Parkes, C and Parodi, F and Parzefall, U and Passeri, A and Passon, O and Peralta, L and Perepelitsa, V and Perrotta, A and Petrolini, A and Piedra, J and Pieri, L and Pierre, F and Pimenta, M and Piotto, E and Podobnik, T and Poireau, V and Pol, ME and Polok, G and Pozdniakov, V and Pukhaeva, N and Pullia, A and Rames, J and Ramler, L and Read, A and Rebecchi, P and Rehn, J and Reid, D and Reinhardt, R and Renton, P and Richard, F and Ridky, J and Rivero, M and Rodriguez, D and Romero, A and Ronchese, P and Roudeau, P and Rovelli, T and Ruhlmann-Kleider, V and Ryabtchikov, D and Sadovsky, A and Salmi, L and Salt, J and Savoy-Navarro, A and Scheidle, T and Schwering, B and Schwickerath, U and Segar, A and Sekulin, R and Siebel, M and Sisakian, A and Smadja, G and Smirnova, Oxana and Sokolov, A and Sopczak, A and Sosnowski, R and Spassov, T and Stanitzki, M and Stocchi, A and Strauss, J and Stugu, B and Szczekowski, M and Szeptycka, M and Szumlak, T and Tabarelli, T and Taffard, AC and Tegenfeldt, F and Timmermans, J and Tkatchev, L and Tobin, M and Todorovova, S and Tome, B and Tonazzo, A and Tortosa, P and Travnicek, P and Treille, D and Tristram, G and Trochimczuk, M and Troncon, C and Turluer, ML and Tyapkin, IA and Tyapkin, P and Tzamarias, S and Uvarov, V and Valenti, G and Van Dam, P and Van Eldik, J and Van Lysebetten, A and van Remortel, N and Van Vulpen, I and Vegni, G and Veloso, F and Venus, W and Verdier, P and Verzi, V and Vilanova, D and Vitale, L and Vrba, V and Wahlen, H and Washbrook, AJ and Weiser, C and Wicke, D and Wickens, J and Wilkinson, G and Winter, M and Witek, M and Yushchenko, O and Zalewska, A and Zalewski, P and Zavrtanik, D and Zhuravlov, V and Zimin, NI and Zintchenko, A and Zupan, M}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{1--25}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C. Particles and Fields}},
  title        = {{Determination of A(FB)(b) at the Z pole using inclusive charge reconstruction and lifetime tagging}},
  url          = {{http://dx.doi.org/10.1140/epjc/s2004-02104-0}},
  doi          = {{10.1140/epjc/s2004-02104-0}},
  volume       = {{40}},
  year         = {{2005}},
}