The ALEPH detector at LEP is used to study single photon events in e+e- collisions at the Z resonance. In a total data sample of 15.7 pb-1 taken in 1990 and 1991 scanning the resonance, 400 events were recorded where each has a single deposition of more than 1.5 GeV measured in the polar angular region \costheta(gamma)\ < 0.74 of the electromagnetic calorimeter. It is shown that this number of events can be accounted for by known processes. After subtraction of background events, the invisible width of the Z is determined to be 450 +/- 34(stat.) +/- 34(syst.) MeV. Using Z resonance parameters derived by ALEPH, the corresponding number of light neutrino generations is found to be 2.68 +/- 0.20(stat.) +/- 0.20(syst.).
A direct measurement of the invisible width of the Z from single photon counting / Buskulic, D; Debonis, I; Decamp, D; Ghez, P; Goy, C; Lees, Jp; Minard, Mn; Pietrzyk, B; Ariztizabal, F; Comas, P; Crespo, Jm; Delfino, M; Efthymiopoulos, I; Fernandez, E; Fernandezbosman, M; Gaitan, V; Garrido, L; Mattison, T; Pacheco, A; Padilla, C; Pascual, A; Creanza, Donato Maria; Depalma, M; Farilla, A; Iaselli, Giuseppe; Maggi, Giorgio Pietro; Natali, S; Nuzzo, S; Quattromini, M; Ranieri, A; Raso, G; Romano, F; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Zito, G; Chai, Y; H, Hu; Huang, D; Huang, X; Lin, J; Wang, T; Xie, Y; Xu, D; Xu, R; Zhang, J; Zhang, L; Zhao, W; Blucher, E; Bonvicini, G; Boudreau, J; Casper, D; Drevermann, H; Forty, Rw; Ganis, G; Gay, C; Hagelberg, R; Harvey, J; Hilgart, J; Jacobsen, R; Jost, B; Knobloch, J; Lehraus, I; Lohse, T; Maggi, M; Markou, C; Martinez, M; Mato, P; Meinhard, H; Minten, A; Miotto, A; Miquel, R; Moser, Hg; Palazzi, P; Pater, Jr; Perlas, Ja; Pusztaszeri, Jf; Ranjard, F; Redlinger, G; Rolandi, L; Rothberg, J; Ruan, T; Saich, M; Schlatter, D; Schmelling, M; Sefkow, F; Tejessy, W; Tomalin, Ir; Veenhof, R; Wachsmuth, H; Wasserbaech, S; Wiedenmann, W; Wildish, T; Witzeling, W; Wotschack, J; Ajaltouni, Z; Badaud, F; Bardadinotwinowska, M; Elfellous, R; Falvard, A; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Montret, Jc; Pallin, D; Perret, P; Podlyski, F; Proriol, J; Prulhiere, F; Saadi, F; Fearnley, T; Hansen, Jb; Hansen, Jd; Hansen, Jr; Hansen, Ph; Mollerud, R; Nilsson, Bs; Kyriakis, A; Simopoulou, E; Siotis, I; Vayaki, A; Zachariadou, K; Badier, J; Blondel, A; Bonneaud, G; Brient, Jc; Fouque, G; Orteu, S; Rouge, A; Rumpf, M; Tanaka, R; Verderi, M; Videau, H; Candlin, Dj; Parsons, Mi; Veitch, E; Focardi, E; Moneta, L; Parrini, G; Corden, M; Georgiopoulos, C; Ikeda, M; Levinthal, D; Antonelli, A; Baldini, R; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Cerutti, F; Chiarella, V; Dettorrepiazzoli, B; Felici, G; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepealtarelli, M; Picchi, P; Colrain, P; Tenhave, I; Lynch, Jg; Maitland, W; Morton, Wt; Raine, C; Reeves, P; Scarr, Jm; Smith, K; Smith, Mg; Thompson, As; Turnbull, Rm; Brandl, B; Braun, O; Geweniger, C; Hanke, P; Hepp, V; Kluge, Ee; Maumary, Y; Putzer, A; Rensch, B; Stahl, A; Tittel, K; Wunsch, M; Beuselinck, R; Binnie, Dm; Cameron, W; Cattaneo, M; Colling, Dj; Dornan, Pj; Greene, Am; Hassard, Jf; Lieske, Nm; Moutoussi, A; Nash, J; Patton, S; Payne, Dg; Phillips, Mj; Sanmartin, G; Sedgbeer, Jk; Wright, Ag; Girtler, P; Kuhn, D; Rudolph, G; Vogl, R; Bowdery, Ck; Brodbeck, Tj; Finch, Aj; Foster, F; Hughes, G; Jackson, D; Keemer, Nr; Nuttall, M; Patel, A; Sloan, T; Snow, Sw; Whelan, Ep; Kleinknecht, K; Raab, J; Renk, B; Sander, Hg; Schmidt, H; Steeg, F; Walther, Sm; Wanke, R; Wolf, B; Bencheikh, Am; Benchouk, C; Bonissent, A; Carr, J; Coyle, P; Drinkard, J; Etienne, F; Nicod, D; Papalexiou, S; Payre, P; Roos, L; Rousseau, D; Schwemling, P; Talby, M; Adlung, S; Assmann, R; Bauer, C; Blum, W; Brown, D; Cattaneo, P; Dehning, B; Dietl, H; Dydak, F; Frank, M; Halley, Aw; Jakobs, K; Lauber, J; Lutjens, G; Lutz, G; Manner, W; Richter, R; Schroder, J; Schwarz, As; Settles, R; Seywerd, H; Stierlin, U; Stiegler, U; Stdenis, R; Wolf, G; Alemany, R; Boucrot, J; Callot, O; Cordier, A; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jaffe, De; Janot, P; Kim, Dw; Lediberder, F; Lefrancois, J; Lutz, Am; Schune, Mh; Veillet, Jj; Videau, I; Zhang, Z; Abbaneo, D; Bagliesi, G; Batignani, G; Bottigli, U; Bozzi, C; Calderini, G; Carpinelli, M; Ciocci, Ma; Ciulli, V; Dellorso, R; Ferrante, I; Fidecaro, F; Foa, L; Forti, F; Giassi, A; Giorgi, Ma; Gregorio, A; Ligabue, F; Lusiani, A; Mannelli, Eb; Marrocchesi, Ps; Messineo, A; Palla, F; Rizzo, G; Sanguinetti, G; Spagnolo, P; Steinberger, J; Tenchini, R; Tonelli, G; Triggiani, G; Valassi, A; Vannini, C; Venturi, A; Verdini, Pg; Walsh, J; Betteridge, Ap; Gao, Y; Green, Mg; March, Pv; Mir, Lm; Medcalf, T; Quazi, Is; Strong, Ja; West, Lr; Botterill, Dr; Clifft, Rw; Edgecock, Tr; Haywood, S; Norton, Pr; Thompson, Jc; Blochdevaux, B; Colas, P; Duarte, H; Emery, S; Kozanecki, W; Lancon, E; Lemaire, Mc; Locci, E; Marx, B; Perez, P; Rander, J; Renardy, Jf; Rosowsky, A; Roussarie, A; Schuller, Jp; Schwindling, J; Mohand, Ds; Vallage, B; Johnson, Rp; Litke, Am; Taylor, G; Wear, J; Ashman, Jg; Babbage, W; Booth, Cn; Buttar, C; Cartwright, S; Combley, F; Dawson, I; Thompson, Lf; Barberio, E; Bohrer, A; Brandt, S; Cowan, G; Grupen, C; Lutters, G; Rivera, F; Schafer, U; Smolik, L; Bosisio, L; Dellamarina, R; Giannini, G; Gobbo, B; Ragusa, F; Bellantoni, L; Chen, W; Conway, Js; Feng, Z; Ferguson, Dps; Gao, Ys; Grahl, J; Harton, Jl; Hayes, Oj; Nachtman, Jm; Pan, Yb; Saadi, Y; Schmitt, M; Scott, I; Sharma, V; Shi, Zh; Turk, Jd; Walsh, Am; Weber, Fv; Wu, Sl; Wu, X; Zheng, M; Zobernig, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 313:3-4(1993), pp. 520-534. [10.1016/0370-2693(93)90027-F]
A direct measurement of the invisible width of the Z from single photon counting
BUSKULIC D; DEBONIS I; DECAMP D; GHEZ P; GOY C; LEES JP; MINARD MN; PIETRZYK B; ARIZTIZABAL F; COMAS P; CRESPO JM; DELFINO M; EFTHYMIOPOULOS I; FERNANDEZ E; FERNANDEZBOSMAN M; GAITAN V; GARRIDO L; MATTISON T; PACHECO A; PADILLA C; PASCUAL A; CREANZA, Donato Maria ;DEPALMA M; FARILLA A; IASELLI, Giuseppe ;MAGGI, Giorgio Pietro ;NATALI S; NUZZO S; QUATTROMINI M; RANIERI A; RASO G; ROMANO F; RUGGIERI F; SELVAGGI G; SILVESTRIS L; TEMPESTA P; ZITO G; CHAI Y; HU H; HUANG D; HUANG X; LIN J; WANG T; XIE Y; XU D; XU R; ZHANG J; ZHANG L; ZHAO W; BLUCHER E; BONVICINI G; BOUDREAU J; CASPER D; DREVERMANN H; FORTY RW; GANIS G; GAY C; HAGELBERG R; HARVEY J; HILGART J; JACOBSEN R; JOST B; KNOBLOCH J; LEHRAUS I; LOHSE T; MAGGI M; MARKOU C; MARTINEZ M; MATO P; MEINHARD H; MINTEN A; MIOTTO A; MIQUEL R; MOSER HG; PALAZZI P; PATER JR; PERLAS JA; PUSZTASZERI JF; RANJARD F; REDLINGER G; ROLANDI L; ROTHBERG J; RUAN T; SAICH M; SCHLATTER D; SCHMELLING M; SEFKOW F; TEJESSY W; TOMALIN IR; VEENHOF R; WACHSMUTH H; WASSERBAECH S; WIEDENMANN W; WILDISH T; WITZELING W; WOTSCHACK J; AJALTOUNI Z; BADAUD F; BARDADINOTWINOWSKA M; ELFELLOUS R; FALVARD A; GAY P; GUICHENEY C; HENRARD P; JOUSSET J; MICHEL B; MONTRET JC; PALLIN D; PERRET P; PODLYSKI F; PRORIOL J; PRULHIERE F; SAADI F; FEARNLEY T; HANSEN JB; HANSEN JD; HANSEN JR; HANSEN PH; MOLLERUD R; NILSSON BS; KYRIAKIS A; SIMOPOULOU E; SIOTIS I; VAYAKI A; ZACHARIADOU K; BADIER J; BLONDEL A; BONNEAUD G; BRIENT JC; FOUQUE G; ORTEU S; ROUGE A; RUMPF M; TANAKA R; VERDERI M; VIDEAU H; CANDLIN DJ; PARSONS MI; VEITCH E; FOCARDI E; MONETA L; PARRINI G; CORDEN M; GEORGIOPOULOS C; IKEDA M; LEVINTHAL D; ANTONELLI A; BALDINI R; BENCIVENNI G; BOLOGNA G; BOSSI F; CAMPANA P; CAPON G; CERUTTI F; CHIARELLA V; DETTORREPIAZZOLI B; FELICI G; LAURELLI P; MANNOCCHI G; MURTAS F; MURTAS GP; PASSALACQUA L; PEPEALTARELLI M; PICCHI P; COLRAIN P; TENHAVE I; LYNCH JG; MAITLAND W; MORTON WT; RAINE C; REEVES P; SCARR JM; SMITH K; SMITH MG; THOMPSON AS; TURNBULL RM; BRANDL B; BRAUN O; GEWENIGER C; HANKE P; HEPP V; KLUGE EE; MAUMARY Y; PUTZER A; RENSCH B; STAHL A; TITTEL K; WUNSCH M; BEUSELINCK R; BINNIE DM; CAMERON W; CATTANEO M; COLLING DJ; DORNAN PJ; GREENE AM; HASSARD JF; LIESKE NM; MOUTOUSSI A; NASH J; PATTON S; PAYNE DG; PHILLIPS MJ; SANMARTIN G; SEDGBEER JK; WRIGHT AG; GIRTLER P; KUHN D; RUDOLPH G; VOGL R; BOWDERY CK; BRODBECK TJ; FINCH AJ; FOSTER F; HUGHES G; JACKSON D; KEEMER NR; NUTTALL M; PATEL A; SLOAN T; SNOW SW; WHELAN EP; KLEINKNECHT K; RAAB J; RENK B; SANDER HG; SCHMIDT H; STEEG F; WALTHER SM; WANKE R; WOLF B; BENCHEIKH AM; BENCHOUK C; BONISSENT A; CARR J; COYLE P; DRINKARD J; ETIENNE F; NICOD D; PAPALEXIOU S; PAYRE P; ROOS L; ROUSSEAU D; SCHWEMLING P; TALBY M; ADLUNG S; ASSMANN R; BAUER C; BLUM W; BROWN D; CATTANEO P; DEHNING B; DIETL H; DYDAK F; FRANK M; HALLEY AW; JAKOBS K; LAUBER J; LUTJENS G; LUTZ G; MANNER W; RICHTER R; SCHRODER J; SCHWARZ AS; SETTLES R; SEYWERD H; STIERLIN U; STIEGLER U; STDENIS R; WOLF G; ALEMANY R; BOUCROT J; CALLOT O; CORDIER A; DAVIER M; DUFLOT L; GRIVAZ JF; HEUSSE P; JAFFE DE; JANOT P; KIM DW; LEDIBERDER F; LEFRANCOIS J; LUTZ AM; SCHUNE MH; VEILLET JJ; VIDEAU I; ZHANG Z; ABBANEO D; BAGLIESI G; BATIGNANI G; BOTTIGLI U; BOZZI C; CALDERINI G; CARPINELLI M; CIOCCI MA; CIULLI V; DELLORSO R; FERRANTE I; FIDECARO F; FOA L; FORTI F; GIASSI A; GIORGI MA; GREGORIO A; LIGABUE F; LUSIANI A; MANNELLI EB; MARROCCHESI PS; MESSINEO A; PALLA F; RIZZO G; SANGUINETTI G; SPAGNOLO P; STEINBERGER J; TENCHINI R; TONELLI G; TRIGGIANI G; VALASSI A; VANNINI C; VENTURI A; VERDINI PG; WALSH J; BETTERIDGE AP; GAO Y; GREEN MG; MARCH PV; MIR LM; MEDCALF T; QUAZI IS; STRONG JA; WEST LR; BOTTERILL DR; CLIFFT RW; EDGECOCK TR; HAYWOOD S; NORTON PR; THOMPSON JC; BLOCHDEVAUX B; COLAS P; DUARTE H; EMERY S; KOZANECKI W; LANCON E; LEMAIRE MC; LOCCI E; MARX B; PEREZ P; RANDER J; RENARDY JF; ROSOWSKY A; ROUSSARIE A; SCHULLER JP; SCHWINDLING J; MOHAND DS; VALLAGE B; JOHNSON RP; LITKE AM; TAYLOR G; WEAR J; ASHMAN JG; BABBAGE W; BOOTH CN; BUTTAR C; CARTWRIGHT S; COMBLEY F; DAWSON I; THOMPSON LF; BARBERIO E; BOHRER A; BRANDT S; COWAN G; GRUPEN C; LUTTERS G; RIVERA F; SCHAFER U; SMOLIK L; BOSISIO L; DELLAMARINA R; GIANNINI G; GOBBO B; RAGUSA F; BELLANTONI L; CHEN W; CONWAY JS; FENG Z; FERGUSON DPS; GAO YS; GRAHL J; HARTON JL; HAYES OJ; NACHTMAN JM; PAN YB; SAADI Y; SCHMITT M; SCOTT I; SHARMA V; SHI ZH; TURK JD; WALSH AM; WEBER FV; WU SL; WU X; ZHENG M; ZOBERNIG G.
1993-01-01
Abstract
The ALEPH detector at LEP is used to study single photon events in e+e- collisions at the Z resonance. In a total data sample of 15.7 pb-1 taken in 1990 and 1991 scanning the resonance, 400 events were recorded where each has a single deposition of more than 1.5 GeV measured in the polar angular region \costheta(gamma)\ < 0.74 of the electromagnetic calorimeter. It is shown that this number of events can be accounted for by known processes. After subtraction of background events, the invisible width of the Z is determined to be 450 +/- 34(stat.) +/- 34(syst.) MeV. Using Z resonance parameters derived by ALEPH, the corresponding number of light neutrino generations is found to be 2.68 +/- 0.20(stat.) +/- 0.20(syst.).
Citazione
A direct measurement of the invisible width of the Z from single photon counting / Buskulic, D; Debonis, I; Decamp, D; Ghez, P; Goy, C; Lees, Jp; Minard, Mn; Pietrzyk, B; Ariztizabal, F; Comas, P; Crespo, Jm; Delfino, M; Efthymiopoulos, I; Fernandez, E; Fernandezbosman, M; Gaitan, V; Garrido, L; Mattison, T; Pacheco, A; Padilla, C; Pascual, A; Creanza, Donato Maria; Depalma, M; Farilla, A; Iaselli, Giuseppe; Maggi, Giorgio Pietro; Natali, S; Nuzzo, S; Quattromini, M; Ranieri, A; Raso, G; Romano, F; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Zito, G; Chai, Y; H, Hu; Huang, D; Huang, X; Lin, J; Wang, T; Xie, Y; Xu, D; Xu, R; Zhang, J; Zhang, L; Zhao, W; Blucher, E; Bonvicini, G; Boudreau, J; Casper, D; Drevermann, H; Forty, Rw; Ganis, G; Gay, C; Hagelberg, R; Harvey, J; Hilgart, J; Jacobsen, R; Jost, B; Knobloch, J; Lehraus, I; Lohse, T; Maggi, M; Markou, C; Martinez, M; Mato, P; Meinhard, H; Minten, A; Miotto, A; Miquel, R; Moser, Hg; Palazzi, P; Pater, Jr; Perlas, Ja; Pusztaszeri, Jf; Ranjard, F; Redlinger, G; Rolandi, L; Rothberg, J; Ruan, T; Saich, M; Schlatter, D; Schmelling, M; Sefkow, F; Tejessy, W; Tomalin, Ir; Veenhof, R; Wachsmuth, H; Wasserbaech, S; Wiedenmann, W; Wildish, T; Witzeling, W; Wotschack, J; Ajaltouni, Z; Badaud, F; Bardadinotwinowska, M; Elfellous, R; Falvard, A; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Montret, Jc; Pallin, D; Perret, P; Podlyski, F; Proriol, J; Prulhiere, F; Saadi, F; Fearnley, T; Hansen, Jb; Hansen, Jd; Hansen, Jr; Hansen, Ph; Mollerud, R; Nilsson, Bs; Kyriakis, A; Simopoulou, E; Siotis, I; Vayaki, A; Zachariadou, K; Badier, J; Blondel, A; Bonneaud, G; Brient, Jc; Fouque, G; Orteu, S; Rouge, A; Rumpf, M; Tanaka, R; Verderi, M; Videau, H; Candlin, Dj; Parsons, Mi; Veitch, E; Focardi, E; Moneta, L; Parrini, G; Corden, M; Georgiopoulos, C; Ikeda, M; Levinthal, D; Antonelli, A; Baldini, R; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Cerutti, F; Chiarella, V; Dettorrepiazzoli, B; Felici, G; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepealtarelli, M; Picchi, P; Colrain, P; Tenhave, I; Lynch, Jg; Maitland, W; Morton, Wt; Raine, C; Reeves, P; Scarr, Jm; Smith, K; Smith, Mg; Thompson, As; Turnbull, Rm; Brandl, B; Braun, O; Geweniger, C; Hanke, P; Hepp, V; Kluge, Ee; Maumary, Y; Putzer, A; Rensch, B; Stahl, A; Tittel, K; Wunsch, M; Beuselinck, R; Binnie, Dm; Cameron, W; Cattaneo, M; Colling, Dj; Dornan, Pj; Greene, Am; Hassard, Jf; Lieske, Nm; Moutoussi, A; Nash, J; Patton, S; Payne, Dg; Phillips, Mj; Sanmartin, G; Sedgbeer, Jk; Wright, Ag; Girtler, P; Kuhn, D; Rudolph, G; Vogl, R; Bowdery, Ck; Brodbeck, Tj; Finch, Aj; Foster, F; Hughes, G; Jackson, D; Keemer, Nr; Nuttall, M; Patel, A; Sloan, T; Snow, Sw; Whelan, Ep; Kleinknecht, K; Raab, J; Renk, B; Sander, Hg; Schmidt, H; Steeg, F; Walther, Sm; Wanke, R; Wolf, B; Bencheikh, Am; Benchouk, C; Bonissent, A; Carr, J; Coyle, P; Drinkard, J; Etienne, F; Nicod, D; Papalexiou, S; Payre, P; Roos, L; Rousseau, D; Schwemling, P; Talby, M; Adlung, S; Assmann, R; Bauer, C; Blum, W; Brown, D; Cattaneo, P; Dehning, B; Dietl, H; Dydak, F; Frank, M; Halley, Aw; Jakobs, K; Lauber, J; Lutjens, G; Lutz, G; Manner, W; Richter, R; Schroder, J; Schwarz, As; Settles, R; Seywerd, H; Stierlin, U; Stiegler, U; Stdenis, R; Wolf, G; Alemany, R; Boucrot, J; Callot, O; Cordier, A; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jaffe, De; Janot, P; Kim, Dw; Lediberder, F; Lefrancois, J; Lutz, Am; Schune, Mh; Veillet, Jj; Videau, I; Zhang, Z; Abbaneo, D; Bagliesi, G; Batignani, G; Bottigli, U; Bozzi, C; Calderini, G; Carpinelli, M; Ciocci, Ma; Ciulli, V; Dellorso, R; Ferrante, I; Fidecaro, F; Foa, L; Forti, F; Giassi, A; Giorgi, Ma; Gregorio, A; Ligabue, F; Lusiani, A; Mannelli, Eb; Marrocchesi, Ps; Messineo, A; Palla, F; Rizzo, G; Sanguinetti, G; Spagnolo, P; Steinberger, J; Tenchini, R; Tonelli, G; Triggiani, G; Valassi, A; Vannini, C; Venturi, A; Verdini, Pg; Walsh, J; Betteridge, Ap; Gao, Y; Green, Mg; March, Pv; Mir, Lm; Medcalf, T; Quazi, Is; Strong, Ja; West, Lr; Botterill, Dr; Clifft, Rw; Edgecock, Tr; Haywood, S; Norton, Pr; Thompson, Jc; Blochdevaux, B; Colas, P; Duarte, H; Emery, S; Kozanecki, W; Lancon, E; Lemaire, Mc; Locci, E; Marx, B; Perez, P; Rander, J; Renardy, Jf; Rosowsky, A; Roussarie, A; Schuller, Jp; Schwindling, J; Mohand, Ds; Vallage, B; Johnson, Rp; Litke, Am; Taylor, G; Wear, J; Ashman, Jg; Babbage, W; Booth, Cn; Buttar, C; Cartwright, S; Combley, F; Dawson, I; Thompson, Lf; Barberio, E; Bohrer, A; Brandt, S; Cowan, G; Grupen, C; Lutters, G; Rivera, F; Schafer, U; Smolik, L; Bosisio, L; Dellamarina, R; Giannini, G; Gobbo, B; Ragusa, F; Bellantoni, L; Chen, W; Conway, Js; Feng, Z; Ferguson, Dps; Gao, Ys; Grahl, J; Harton, Jl; Hayes, Oj; Nachtman, Jm; Pan, Yb; Saadi, Y; Schmitt, M; Scott, I; Sharma, V; Shi, Zh; Turk, Jd; Walsh, Am; Weber, Fv; Wu, Sl; Wu, X; Zheng, M; Zobernig, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 313:3-4(1993), pp. 520-534. [10.1016/0370-2693(93)90027-F]
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