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A MEASUREMENT OF A(FB)(B) IN LIFETIME TAGGED HEAVY FLAVOR Z DECAYS

BUSKULIC, D and CASPER, D and DEBONIS, I and DECAMP, D and GHEZ, P and GOY, C and LEES, JP and MINARD, MN and ODIER, P and PETRZYK, B and ARIZTIZABAL, F and CHMEISSANI, M and CRESPO, JM and EFTHYMIOPOULOS, I and FERNANDEZ, E and FERNANDEZBOSMAN, M and GAITAN, V and GARRIDO, LI and MARTINEZ, M and MATTISON, T and ORTEU, S and PACHECO, A and PADILLO, C and PALLA, F and PASCUAL, A and PERLAS, JA and TEUBERT, F and CREANZA, D and DEPALMA, M and FARILLA, A and IASELLI, G and MAGGI, G and MARINELLI, N and NATALI, S and NUZZO, S and RANIERI, A and RASO, G and ROMANO, F and RUGGIERI, F and SELVAGGI, G and SILVESTRIS, L and TEMPESTA, P and ZITO, G and CHAI, Y and HUANG, D and HUANG, X and LIN, J and WANG, T and XIE, Y and XU, D and XU, R and ZHANG, J and ZHANG, L and ZHAO, W and BONVICINI, G and BOUDREAU, J and COMAS, P and COYLE, P and DREVERMANN, and ENGELHARDT, A and FORTY, RW and GANIS, G and GAY, C and GIRONE, M and HAGELBERG, R and HARVEY, J and JACOBSEN, R and JOST, B and KNOBLOCH, J and LEHRAUS, I and MAGGI, M and MARKOU, C and MATO, P and MEINHARD, H and MINTEN, A and MIQUEL, R and PALAZZI, P and PATER, JR and PERRODO, P and PUSZTASZERI, JF and RANJARD, F and ROLANDI, L and ROTHBERG, J and SAICH, M and SCHLATTER, D and SCHMELLING, M and TEJESSY, W and TOMALIN, IR and VEENHOF, R and VENTURI, A and WACHSMUTH, H and WASSERBAECH, S and WIEDENMANN, W and WILDISH, T and WITZELING, W and WOTSCHACK, J and AJALTOUNI, Z and BARDADINOTWINOWSKA, M and BARRES, A and BOYER, C and FALVARD, A and GAY, P and GUICHENEY, C and HENRARD, P and JOUSSET, J and MICHEL, B and MONTRET, JC and PALLIN, D and PERRET, P and PODLYSKI, F and PRORJOL, J and SAADI, F and FEARNLEY, T and HANSEN, JB and HANSEN, JD and HANSEN, JR and HANSEN, PH and JOHNSON, SD and MOLLERUD, R and NILSSON, BS and KYRIAKIS, A and SIMOPOULOU, E and SIOTIS, I and VAYAKI, A and ZACHARIADOU, K and BLONDEL, A and BONNEAUD, G and BRIENT, JC and BOURON, P and PASSALACQUA, L and ROUGE, A and RUMPF, M and TANAKA, R and VALASSI, A and VERDERI, M and VIDEAU, H and CANDLIN, DJ and PARSONS, MI and VEITCH, E and FOCARDI, E and PARRINI, G and CORDEN, M and DELFINO, M and GEORGIOPOULOS, C and JAFFE, DE and LEVINTHAL, D and ANTONELLI, A and BENCIVENNI, G and BOLOGNA, G and BOSSI, F and CAMPANA, P and CAPON, G and CERUTTI, F and CHIARELLA, V and FELICI, G and LAURELLI, P and MANNOCCHI, G and MURTAS, F and MURTAS, GP and PEPEALTARELLI, M and SALOMONE, S and COLRAIN, P and TENHAVE, I and KNOWLES, IG and LYNCH, JG and MAITLAND, W and MORTON, WT and RAINE, C and REEVES, P and SCARR, JM and SMITH, K and SMITH, MG and THOMPSON, AS and THORN, S and TURNBULL, RM and BECKER, U and OBRAUN, O and GEWENIGER, C and HANKE, P and HEPP, V and KLUGE, EE and PUTZER, A and RENSCH, B and SCHMIDT, M and STENZEL, H and TITTEL, K and WUNSCH, M and BEUSELINCK, R and BINNIE, DM and CAMERON, W and CATTANEO, M and COLLING, DJ and DORNAN, PJ and HASSARD, JF and KONSTANTINIDIS, N and MONETA, L and MOUTOUSSI, A and NASH, J and PAYNE, DG and SANMARTIN, G and SEDGBEER, JK and WRIGHT, AG and GIRTLER, P and KUHN, D and RUDOLPH, G and VOGL, R and BOWDERY, CK and BRODBECK, TJ and FINCH, AJ and FOSTER, F and HUGHES, G and JACKSON, D and KEEMER, NR and NUTTALL, M and PATEL, A and SLOAN, T and SNOW, SW and WHELAN, EP and GALLA, A and GREENE, AM and KLEINKNECHT, K and RAAB, J and RENK, B and SANDER, HG and SCHMIDT, H and WALTHER, SM and WANKE, R and WOLF, B and BENCHEIKH, AM and BENCHOUK, C and BONISSENT, A and CALVERT, D and CARR, J and DIACONU, C and ETIENNE, F and NICOD, D and PAYRE, P and ROOS, L and ROUSSEAU, D and SCHWEMLING, P and TALBY, M and ADLUNG, S and ASSMANN, R and BAUER, C and BLUM, W and BROWN, D and CATTANEO, P and DEHNING, B and DIETL, H and DYDAK, F and FRANK, M and HALLEY, AW and JAKOBS, K and KROHA, H and LAUBER, J and LUTJENS, G and LUTZ, G and MANNER, W and MOSER, HG and RCHTER, R and SCHAEL, S and SCHRODER, J and SCHWARZ, AS and SETTLES, R and SEYWERE, H and STIERLIN, U and STIEGLER, U and STDENIS, R and WOLF, G and ALEMANY, R and BOUCROT, J and CALLOT, O and CORDIER, A and COURAULT, F and DAVIER, M and DUFLOT, L and GRIVAZ, JF and HEUSSE, P and JANOT, P and JACQUET, M and KIMTR, DW and LEDIBERDER, F and LEFRANCOIS, J and LUTZ, AM and MUSOLINO, G and NIKOLIC, I and PARK, HJ and PARK, IC and SIMION, S and SCHUENE, MH and VEILLET, JJ and VIDEAU, I and ABBANEO, D and BAGLIESI, G and BATIGNANI, G and BOTTIGLI, U and BOZZI, C and CALDERINI, G and CARPINELLI, M and CIOCCI, MA and CIULLI, V and DELLORSO, R and FERRANTE, I and FIDECARO, F and FOA, L and FORTI, F and GIASSI, A and GIORGI, MA and GREGORIO, A and LIGABUE, F and LUSIANI, A and MARROCCHESI, PS and MARTIN, EB and MESSINEO, A and RIZZO, G and SANGUINETTI, G and SPAGNOLO, P and STEINBERGER, J and TENCHINI, R and TONELLI, G and TRIGGIANI, G and VANNINI, C and VERDINI, PG and WALSH, J and BETTERIDGE, AP and GAO, Y and GREEN, MG and JOHNSON, DL and MARCH, PV and MEDCALF, T and MIR, LM and QUAZI, IS and STRONG, JA and BERTIN, V and BOTTERILL, DR and CLIFFT, RW and EDGECOCK, TR and HAYWOOD, S and EDWARDS, M and NORTON, PR and THOMPSON, JC and BLOCHDEVAUX, B and COLAS, P and DUARTE, H and EMERY, S and KOZANECKI, W and LANCON, E and LEMAIRE, MC and LOCCI, E and MARX, B and PEREZ, P and RANDER, J and RENARDY, JF and ROSOWSKY, A and ROUSSARIE, A and SCHULLER, JP and SCHWINDLING, J and MOHAND, DS and VALLAGE, B and JOHNSON, RP and LITKE, AM and TAYLOR, G and WEAR, J and BEDDALL, A and BOOTH, C and CARTWRIGHT, S and COMBLEY, F and DAWSON, I and KOKSAL, A and RANKIN, C and THOMPSON, LF and BOHRER, A and BRANDT, S and COWAN, G and FEIGL, E and GRUPEN, C and LUTTERS, G and MINGUETRODRIGUEZ, J and RIVERA, F and SARAIVA, P and SCHAFER, U and SMOLIK, L and BOSSISIO, L and DELLAMARINA, R and GIANNINI, G and GOBBO, B and PITIS, L and RAGUSA, F and BELLANTONI, L and CONWAY, JS and FENG, Z and FERGUSON, DPS and GAO, YS and GRAHL, J and HARTON, JL and HAYES, OJ and HU, H and NACHTMAN, JM and PAN, YB and SAADI, Y and SCHMITT, M and SCOTT, I and SHARMA, V and TURK, JD and WALSH, AM and WEBER, FV and WU, SL and WU, X and YAMARTINO, JM and ZHENG, M and ZOBERNIG, G (1994) A MEASUREMENT OF A(FB)(B) IN LIFETIME TAGGED HEAVY FLAVOR Z DECAYS. PHYS LETT B , 335 (1) 99 - 108.

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Abstract

A new measurement of the forward-backward asymmetry in Z --> bbBAR decays is presented. Hadrons from b decays are tagged using their long lifetimes. The b quark charge and direction are reconstructed with a hemisphere charge algorithm. The asymmetry and reconstructed b hemisphere charge are measured in the 69 pb-1 of data collected by ALEPH during 1991, 1992 and 1993. They are used to extract sin2theta(w)eff, which is determined to be 0.2315 +/- 0.0016 (stat.) +/- 0.0009 (syst.), corresponding to an A(FB)b of 0.00992 +/- 0.0084 (stat.) +/- 0.0046 (stat.).

Type:Article
Title:A MEASUREMENT OF A(FB)(B) IN LIFETIME TAGGED HEAVY FLAVOR Z DECAYS
Keywords:FORWARD-BACKWARD ASYMMETRY, LUND MONTE-CARLO, JET FRAGMENTATION, -> B(B)OVER-BAR, E+E-PHYSICS, C(C)OVER-BAR
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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