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Experimental study of the triple-gluon vertex

Physics Letters B 255:3 (1991) 466-476

Authors:

P Abreu, W Adam, F Adami, T Adye, T Akesson, GD Alekseev, P Allen, S Almehed, F Alted, SJ Alvsvaag, U Amaldi, E Anassontzis, WD Apel, B Asman, P Astier, JE Augustin, A Augustinus, P Baillon, P Bambade, F Bara, G Barbiellini, DY Bardin, A Baroncelli, O Barring, W Bartl, MJ Bates, M Baubillier, KH Becks, CJ Beeston, M Begalli, P Beilliere, I Belokopytov, P Beltran, D Benedic, JM Benlloch, M Berggren, D Bertrand, S Biagi, F Bianchi, JH Bibby, MS Bilenky, P Billoir, J Bjarne, D Bloch, PN Bogolubov, D Bollini, T Bolognese, M Bonapart, M Bonesini, PSL Booth, M Boratav, P Borgeaud, H Borner, C Bosio, O Botner, B Bouquet, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, C Bricman, RCA Brown, N Brummer, JM Brunet, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJC Rozas, JE Campagne, A Campion, T Camporesi, V Canale, F Cao, L Carroll, C Caso, E Castelli, MVC Gimenez, A Cattai, FR Cavallo, L Cerritp, P Charpentier, P Checchia, GA Chelkov, L Chevalier, P Chliapnikov, V Chorowicz, R Cirio, MP Clara, JL Contreras, R Contri, G Cosme, F Couchot, HB Crawley, D Crennell, G Crosetti, N Crosland

Abstract:

In four-jet events from e+e- →Z0 →multihadrons one can separate the three principal contributions from the triple-gluon vertex, double gluon-bremsstrahlung and the secondary quark-antiquark production, using the shape of the two-dimensional angular distributions in the generalized Nachtmann-Reiter angle θNR* and the opening angle of the secondary jets. Thus one can identify directly the contribution from the triple-gluon vertex without comparison with a specific non-QCD model. Applying this new method to events taken with the DELPHI-detector we get for the ratio of the colour factor Nc to the fermionic Casimir operator CF: Nc CF= 2.55 ± 0.55 (stat.) ± 0.4 (fragm. + models) ± 0.2 (error in bias) in agreement with the value 2.25 expected in QCD from Nc=3 and CF= 4 3. © 1991.
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A READOUT SYSTEM FOR THE ZEUS CENTRAL TRACKING DETECTOR FAST VERTEX TRIGGER

(1991) 294-308

Authors:

B FOSTER, GP HEATH, N HARNEW, J NASH, PD SHIELD, IM SILVESTER, R HALSALL, M JEFFS, S MADANI, R MILBORROW
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DETERMINATION OF Z0 RESONANCE PARAMETERS AND COUPLINGS FROM ITS HADRONIC AND LEPTONIC DECAYS

NUCLEAR PHYSICS B 367:3 (1991) 511-574

Authors:

P ABREU, W ADAM, F ADAMI, T ADYE, T AKESSON, GD ALEKSEEV, P ALLEN, S ALMEHED, F ALTED, SJ ALVSVAAG, U AMALDI, E ANASSONTZIS, P ANTILOGUS, WD APEL, RJ APSIMON, B ASMAN, P ASTIER, JE AUGUSTIN, A AUGUSTINUS, P BAILLON, P BAMBADE, F BARAO, G BARBIELLINI, DY BARDIN, A BARONCELLI, O BARRING, W BARTL, M BATTAGLIA, MJ BATES, M BAUBILLIER, KH BECKS, CJ BEESTON, M BEGALLI, P BEILLIERE, Y BELOKOPYTOV, P BELTRAN, D BENEDIC, JM BENLLOCH, M BERGGREN, D BERTRAND, S BIAGI, F BIANCHI, JH BIBBY, MS BILENKY, P BILLOIR, J BJARNE, D BLOCH, S BLYTH, PN BOGOLUBOV, T BOLOGNESE, M BONAPART, M BONESINI, W BONIVENTO, PSL BOOTH, M BORATAV, P BORGEAUD, G BORISOV, H BORNER, C BOSIO, O BOTNER, B BOUQUET, M BOZZO, S BRAIBANT, P BRANCHINI, KD BRAND, RA BRENNER, C BRICMAN, RCA BROWN, N BRUMMER, JM BRUNET, L BUGGE, T BURAN, H BURMEISTER, JAMA BUYTAERT, M CACCIA, M CALVI, AJC ROZAS, JE CAMPAGNE, A CAMPION, T CAMPORESI, V CANALE, F CAO, L CARROLL, C CASO, E CASTELLI, MVC GIMENEZ, A CATTAI, FR CAVALLO, L CERRITO, M CHAPKIN, P CHARPENTIER, P CHECCHIA, GA CHELKOV, L CHEVALIER, P CHLIAPNIKOV, V CHOROWICZ, R CIRIO, MP CLARA, P COLLINS, JL CONTRERAS, R CONTRI, G COSME, F COUCHOT, HB CRAWLEY, D CRENNELL, G CROSETTI, N CROSLAND, M CROZON, JC MAESTRO, S CZELLAR, S DAGORET, E DAHLJENSEN, B DALMAGNE, M DAM, G DAMGAARD, G DARBO, E DAUBIE, PD DAUNCEY, M DAVENPORT, P DAVID, A DEANGELIS, M DEBEER, H DEBOECK, W DEBOER, C DECLERCQ, MDMD LASO, N DEGROOT, C DELAVAISSIERE, B DELOTTO, A DEMIN, C DEFOIX, D DELIKARIS, S DELORME, P DELPIERRE, N DEMARIA, J DERKAOUI, L DICIACCIO, H DIJKSTRA, F DJAMA, J DOLBEAU, M DONSZELMANN, K DOROBA, M DRACOS, J DREES, M DRIS, Y DUFOUR, W DULINSKI, R DZHELYADIN, LO EEK, PAM EEROLA, T EKELOF, G EKSPONG, AE PEISERT, JP ENGEL, D FASSOULIOTIS, MF ALONSO, A FERRER, TA FILIPPAS, A FIRESTONE, H FOETH, E FOKITIS, P FOLEGATI, F FONTANELLI, H FORSBACH, B FRANEK, P FRENKIEL, DC FRIES, AG FRODESEN, R FRUHWIRTH, F FULDAQUENZER, K FURNIVAL, H FURSTENAU, J FUSTER, JM GAGO, G GALEAZZI, D GAMBA, C GARCIA, J GARCIA, U GASPARINI, P GAVILLET, EN GAZIS, JP GERBER, P GIACOMELLI, KW GLITZA, R GOKIELI, VM GOLOVATYUK, JJGY CADENAS, A GOOBAR, G GOPAL, M GORSKI, V GRACCO, A GRANT, F GRARD, E GRAZIANI, MH GROS, G GROSDIDIER, B GROSSETETE, S GUMENYUK, J GUY, F HAHN, M HAHN, S HAIDER, Z HAJDUK, A HAKANSSON, A HALLGREN, K HAMACHER, GH DEMONCHENAULT, FJ HARRIS, BW HECK, I HERBST, JJ HERNANDEZ, P HERQUET, H HERR, I HIETANEN, E HIGON, HJ HILKE, SD HODGSON, T HOFMOKL, R HOLMES, SO HOLMGREN, D HOLTHUIZEN, PF HONORE, JE HOOPER, M HOULDEN, J HRUBEC, PO HULTH, K HULTQVIST, D HUSSON, BD HYAMS, P IOANNOU, D ISENHOWER, PS IVERSEN, JN JACKSON, P JALOCHA, G JARLSKOG, P JARRY, B JEANMARIE, EK JOHANSSON, D JOHNSON, M JONKER, L JONSSON, P JUILLOT, G KALKANIS, G KALMUS, G KANTARDJIAN, F KAPUSTA, S KATSANEVAS, EC KATSOUFIS, R KERANEN, J KESTEMAN, BA KHOMENKO, NN KHOVANSKI, B KING, NJ KJAER, H KLEIN, W KLEMPT, A KLOVNING, P KLUIT, JH KOEHNE, B KOENE, P KOKKINIAS, M KOPF, M KORATZINOS, K KORCYL, AV KORYTOV, B KORZEN, V KOSTUKHIN, C KOURKOUMELIS, T KREUZBERGER, J KROLIKOWSKI, U KRUENERMARQUIS, W KRUPINSKI, W KUCEWICZ, K KULKA, K KURVINEN, C LACASTA, C LAMBROPOULOS, JW LAMSA, L LANCERI, V LAPIN, JP LAUGIER, R LAUHAKANGAS, G LEDER, F LEDROIT, J LEMONNE, G LENZEN, V LEPELTIER, A LETESSIERSELVON, D LIKO, E LIEB, E LILLETHUN, J LINDGREN, A LIPNIACKA, I LIPPI, R LLOSA, B LOERSTAD, M LOKAJICEK, JG LOKEN, MAL AGUERA, A LOPEZFERNANDEZ, M LOS, D LOUKAS, A LOUNIS, JJ LOZANO, R LUCOCK, P LUTZ, L LYONS, G MAEHLUM, J MAILLARD, A MALTEZOS, S MALTEZOS, F MANDL, J MARCO, M MARGONI, JC MARIN, A MARKOU, S MARTI, L MATHIS, F MATORRAS, C MATTEUZZI, G MATTHIAE, M MAZZUCATO, M MCCUBBIN, R MCKAY, R MCNULTY, E MENICHETTI, G MEOLA, C MERONI, WT MEYER, M MICHELOTTO, WA MITAROFF, GV MITSELMAKHER, U MJOERNMARK, T MOA, R MOELLER, K MOENIG, MR MONGE, P MORETTINI, H MUELLER, H MULLER, WJ MURRAY, G MUYATT, F NARAGHI, U NAUKORZEN, FL NAVARRIA, P NEGRI, BS NIELSEN, B NIJJHAR, V NIKOLAENKO, V OBRAZTSOV, AG OLSHEVSKI, R ORAVA, A OSTANKOV, A OURAOU, R PAIN, H PALKA, T PAPADOPOULOU, L PAPE, A PASSERI, M PEGORARO, V PEREVOZCHIKOV, M PERNICKA, A PERROTTA, F PIERRE, M PIMENTA, O PINGOT, A PINSENT, ME POL, G POLOK, P POROPAT, P PRIVITERA, A PULLIA, J PYYHTIA, D RADOJICIC, S RAGAZZI, WH RANGE, PN RATOFF, AL READ, NG REDAELLI, M REGLER, D REID, PB RENTON, LK RESVANIS, F RICHARD, M RICHARDSON, J RIDKY, G RINAUDO, I RODITI, A ROMERO, I RONCAGLIOLO, P RONCHESE, C RONNQVIST, EI ROSENBERG, U ROSSI, E ROSSO, P ROUDEAU, T ROVELLI, W RUCKSTUHL, V RUHLMANN, A RUIZ, K RYBICKI, H SAARIKKO, Y SACQUIN, J SALT, E SANCHEZ, J SANCHEZ, M SANNINO, M SCHAEFFER, S SCHAEL, H SCHNEIDER, F SCURI, AM SEGAR, R SEKULIN, M SESSA, G SETTE, R SEUFERT, RC SHELLARD, P SIEGRIST, S SIMONETTI, F SIMONETTO, AN SISSAKIAN, TB SKAALI, G SKJEVLING, G SMADJA, GR SMITH, N SMIRNOV, R SOSNOWSKI, TS SPASSOFF, E SPIRITI, S SQUARCIA, H STAECK, C STANESCU, G STAVROPOULOS, F STICHELBAUT, A STOCCHI, J STRAUSS, R STRUB, CJ STUBENRAUCH, M SZCZEKOWSKI, M SZEPTYCKA, P SZYMANSKI, T TABARELLI, S TAVERNIER, O TCHIKILEV, GE THEODOSIOU, A TILQUIN, J TIMMERMANS, VG TIMOFEEV, LG TKATCHEV, T TODOROV, DZ TOET, L TORTORA, MT TRAINOR, D TREILLE, U TREVISAN, W TRISCHUK, G TRISTRAM, C TRONCON, A TSIROU, EN TSYGANOV, M TURALA, R TURCHETTA, ML TURLUER, T TUUVA, IA TYAPKIN, M TYNDEL, S TZAMARIAS, B UEBERSCHAER, S UEBERSCHAER, O ULLALAND, VA UVAROV, G VALENTI, E VALLAZZA, JAV FERRER, GW VANAPELDOORN, P VANDAM, WK VANDONINCK, N VANEIJNDHOVEN, C VANDERVELDE, J VARELA, P VAZ, G VEGNI, J VELASCO, L VENTURA, W VENUS, F VERBEURE, LS VERTOGRADOV, L VIBERT, D VILANOVA, EV VLASOV, AS VODOPYANOV, M VOLLMER, S VOLPONI, G VOULGARIS, M VOUTILAINEN, V VRBA, H WAHLEN, C WALCK, F WALDNER, M WAYNE, P WEILHAMMER, J WERNER, AM WETHERELL, JH WICKENS, J WIKNE, GR WILKINSON, WSC WILLIAMS, M WINTER, D WORMALD, G WORMSER, K WOSCHNAGG, N YAMDAGNI, P YEPES, A ZAITSEV, A ZALEWSKA, P ZALEWSKI, E ZEVGOLATAKOS, G ZHANG, NI ZIMIN, M ZITO, R ZITOUN, RZ FUNCHAL, G ZUMERLE, J ZUNIGA
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THE REACTION E+E--] GAMMA-GAMMA(GAMMA) AT Z0 ENERGIES

PHYSICS LETTERS B 268:2 (1991) 296-304

Authors:

P ABREU, W ADAM, F ADAMI, T ADYE, T AKESSON, GD ALEKSEEV, P ALLEN, S ALMEHED, F ALTED, SJ ALVSVAAG, U AMALDI, E ANASSONTZIS, P ANTILOGUS, WD APEL, RJ APSIMON, B ASMAN, P ASTIER, JE AUGUSTIN, A AUGUSTINUS, P BAILLON, P BAMBADE, F BARAO, G BARBIELLINI, DY BARDIN, A BARONCELLI, O BARRING, W BARTL, M BATTAGLIA, MJ BATES, M BAUBILLIER, KH BECKS, CJ BEESTON, M BEGALLI, P BEILLIERE, Y BELOKOPYTOV, P BELTRAN, D BENEDIC, JM BENLLOCH, M BERGGREN, D BERTRAND, S BIAGI, F BIANCHI, JH BIBBY, MS BILENKY, P BILLOIR, J BJARNE, D BLOCH, S BLYTH, PN BOGOLUBOV, T BOLOGNESE, M BONAPART, M BONESINI, W BONIVENTO, PSL BOOTH, M BORATAV, P BORGEAUD, G BORISOV, H BORNER, C BOSIO, O BOTNER, B BOUQUET, M BOZZO, S BRAIBANT, P BRANCHINI, KD BRAND, RA BRENNER, C BRICMAN, RCA BROWN, N BRUMMER, JM BRUNET, L BUGGE, T BURAN, H BURMEISTER, JAMA BUYTAERT, M CACCIA, M CALVI, AJC ROZAS, JE CAMPAGNE, A CAMPION, T CAMPORESI, V CANALE, F CAO, L CARROLL, C CASO, E CASTELLI, MVC GIMENEZ, A CATTAI, FR CAVALLO, L CERRITO, P CHARPENTIER, P CHECCHIA, GA CHELKOV, L CHEVALIER, P CHLIAPNIKOV, V CHOROWICZ, R CIRIO, MP CLARA, P COLLINS, JL CONTRERAS, R CONTRI, G COSME, F COUCHOT, HB CRAWLEY, D CRENNELL, G CROSETTI, N CROSLAND, M CROZON, JC MAESTRO, S CZELLAR, S DAGORET, E DAHLJENSEN, B DALMAGNE, M DAM, G DAMGAARD, G DARBO, E DAUBIE, PD DAUNCEY, M DAVENPORT, P DAVID, A DEANGELIS, M DEBEER, H DEBOECK, W DEBOER, C DECLERCQ, MDMD LASO, N DEGROOT, C DELAVAISSIERE, B DELOTTO, A DEMIN, C DEFOIX, D DELIKARIS, S DELORME, P DELPIERRE, N DEMARIA, J DERKAOUI, L DICIACCIO, H DIJKSTRA, F DJAMA, J DOLBEAU, M DONSZELMANN, K DOROBA, M DRACOS, J DREES, M DRIS, Y DUFOUR, W DULINSKI, R DZHELYADIN, LO EEK, PAM EEROLA, T EKELOF, G EKSPONG, AE PEISERT, JP ENGEL, D FASSOULIOTIS, A FENYUK, MF ALONSO, A FERRER, TA FILIPPAS, A FIRESTONE, H FOETH, E FOKITIS, P FOLEGATI, F FONTANELLI, H FORSBACH, B FRANEK, P FRENKIEL, DC FRIES, AG FRODESEN, R FRUHWIRTH, F FULDAQUENZER, K FURNIVAL, H FURSTENAU, J FUSTER, JM GAGO, G GALEAZZI, D GAMBA, C GARCIA, J GARCIA, U GASPARINI, P GAVILLET, EN GAZIS, JP GERBER, P GIACOMELLI, KW GLITZA, R GOKIELI, VM GOLOVATYUK, JJGY CADENAS, A GOOBAR, G GOPAL, M GORSKI, V GRACCO, A GRANT, F GRARD, E GRAZIANI, MH GROS, G GROSDIDIER, B GROSSETETE, S GUMENYUK, J GUY, F HAHN, M HAHN, S HAIDER, Z HAJDUK, A HAKANSSON, A HALLGREN, K HAMACHER, GH DEMONCHENAULT, FJ HARRIS, BW HECK, I HERBST, JJ HERNANDEZ, P HERQUET, H HERR, I HIETANEN, E HIGON, HJ HILKE, SD HODGSON, T HOFMOKL, R HOLMES, SO HOLMGREN, D HOLTHUIZEN, PF HONORE, JE HOOPER, M HOULDEN, J HRUBEC, PO HULTH, K HULTQVIST, D HUSSON, BD HYAMS, P IOANNOU, D ISENHOWER, PS IVERSEN, JN JACKSON, P JALOCHA, G JARLSKOG, P JARRY, B JEANMARIE, EK JOHANSSON, D JOHNSON, M JONKER, L JONSSON, P JUILLOT, G KALKANIS, G KALMUS, G KANTARDJIAN, F KAPUSTA, A KATARGIN, S KATSANEVAS, EC KATSOUFIS, R KERANEN, J KESTEMAN, BA KHOMENKO, NN KHOVANSKI, B KING, NJ KJAER, H KLEIN, W KLEMPT, A KLOVNING, P KLUIT, JH KOEHNE, B KOENE, P KOKKINIAS, M KOPF, M KORATZINOS, K KORCYL, AV KORYTOV, B KORZEN, V KOSTUKHIN, C KOURKOUMELIS, T KREUZBERGER, J KROLIKOWSKI, U KRUENERMARQUIS, W KRUPINSKI, W KUCEWICZ, K KURVINEN, C LACASTA, C LAMBROPOULOS, JW LAMSA, L LANCERI, V LAPIN, JP LAUGIER, R LAUHAKANGAS, G LEDER, F LEDROIT, J LEMONNE, G LENZEN, V LEPELTIER, A LETESSIERSELVON, D LIKO, E LIEB, E LILLETHUN, J LINDGREN, A LIPNIACKA, I LIPPI, R LLOSA, B LOERSTAD, M LOKAJICEK, JG LOKEN, MAL AGUERA, A LOPEZFERNANDEZ, M LOS, D LOUKAS, A LOUNIS, JJ LOZANO, R LUCOCK, P LUTZ, L LYONS, G MAEHLUM, J MAILLARD, A MALTEZOS, S MALTEZOS, F MANDL, J MARCO, M MARGONI, JC MARIN, A MARKOU, S MARTI, L MATHIS, F MATORRAS, C MATTEUZZI, G MATTHIAE, M MAZZUCATO, M MCCUBBIN, R MCKAY, R MCNULTY, E MENICHETTI, C MERONI, WT MEYER, M MICHELOTTO, WA MITAROFF, GV MITSELMAKHER, U MJOERNMARK, T MOA, R MOELLER, K MOENIG, MR MONGE, P MORETTINI, H MUELLER, H MULLER, WJ MURRAY, G MYATT, F NARAGHI, U NAUKORZEN, FL NAVARRIA, P NEGRI, BS NIELSEN, B NIJJHAR, V NIKOLAENKO, V OBRAZTSOV, AG OLSHEVSKI, R ORAVA, A OSTANKOV, A OURAOU, R PAIN, H PALKA, T PAPADOPOULOU, L PAPE, A PASSERI, M PEGORARO, V PEREVOZCHIKOV, M PERNICKA, A PERROTTA, F PIERRE, M PIMENTA, O PINGOT, A PINSENT, ME POL, G POLOK, P POROPAT, P PRIVITERA, A PULLIA, J PYYHTIA, D RADOJICIC, S RAGAZZI, WH RANGE, PN RATOFF, AL READ, NG REDAELLI, M REGLER, D REID, PB RENTON, LK RESVANIS, F RICHARD, M RICHARDSON, J RIDKY, G RINAUDO, I RODITI, A ROMERO, I RONCAGLIOLO, P RONCHESE, C RONNQVIST, EI ROSENBERG, U ROSSI, E ROSSO, P ROUDEAU, T ROVELLI, W RUCKSTUHL, V RUHLMANN, A RUIZ, K RYBICKI, H SAARIKKO, Y SACQUIN, J SALT, E SANCHEZ, J SANCHEZ, M SANNINO, M SCHAEFFER, S SCHAEL, H SCHNEIDER, F SCURI, AM SEGAR, R SEKULIN, M SESSA, G SETTE, R SEUFERT, RC SHELLARD, P SIEGRIST, S SIMONETTI, F SIMONETTO, AN SISSAKIAN, TB SKAALI, G SKJEVLING, G SMADJA, GR SMITH, R SOSNOWSKI, TS SPASSOFF, E SPIRITI, S SQUARCIA, H STAECK, C STANESCU, G STAVROPOULOS, F STICHELBAUT, A STOCCHI, J STRAUSS, R STRUB, CJ STUBENRAUCH, M SZCZEKOWSKI, M SZEPTYCKA, P SZYMANSKI, T TABARELLI, S TAVERNIER, GE THEODOSIOU, A TILQUIN, J TIMMERMANS, VG TIMOFEEV, LG TKATCHEV, T TODOROV, DZ TOET, L TORTORA, MT TRAINOR, D TREILLE, U TREVISAN, W TRISCHUK, G TRISTRAM, C TRONCON, A TSIROU, EN TSYGANOV, M TURALA, R TURCHETTA, ML TURLUER, T TUUVA, IA TYAPKIN, M TYNDEL, S TZAMARIAS, B UEBERSCHAER, S UEBERSCHAER, O ULLALAND, VA UVAROV, G VALENTI, E VALLAZZA, JAV FERRER, GW VANAPELDOORN, P VANDAM, WK VANDONINCK, N VANEIJNDHOVEN, C VANDERVELDE, J VARELA, P VAZ, G VEGNI, J VELASCO, L VENTURA, W VENUS, F VERBEURE, LS VERTOGRADOV, L VIBERT, D VILANOVA, EV VLASOV, AS VODOPYANOV, M VOLLMER, S VOLPONI, G VOULGARIS, M VOUTILAINEN, V VRBA, H WAHLEN, C WALCK, F WALDNER, M WAYNE, P WEILHAMMER, J WERNER, AM WETHERELL, JH WICKENS, J WIKNE, GR WILKINSON, WSC WILLIAMS, M WINTER, D WORMALD, G WORMSER, K WOSCHNAGG, N YAMDAGNI, P YEPES, A ZAITSEV, A ZALEWSKA, P ZALEWSKI, E ZEVGOLATAKOS, G ZHANG, NI ZIMIN, M ZITO, R ZITOUN, RZ FUNCHAL, G ZUMERLE, J ZUNIGA
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Energy-energy correlations in hadronic final states from Z0 decays

Physics Letters B 252:1 (1990) 149-158

Authors:

P Abreu, W Adam, F Adami, T Ayde, GD Alekseev, P Allen, S Almehed, F Alted, SJ Alvsvaag, U Amaldi, E Anassontzis, WD Apel, B Asman, P Astier, JE Augustinus, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, DY Bardin, A Baroncelli, O Barring, W Bartl, MJ Bates, M Baubillier, KH Becks, CJ Beeston, P Beilliere, I Belokopytov, P Beltran, D Benedic, JM Benlloch, M Berggren, D Bertrand, S Biagi, F Bianchi, JH Bibby, MS Bilenky, P Billoir, J Biarne, D Bloch, PN Bogolubov, D Bollini, T Bolognese, M Bonapart, M Bonesini, PSL Booth, M Boratav, P Borgeaud, H Borner, C Bosio, O Botner, B Bouquet, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, C Bricman, RCA Brown, N Brummer, JM Brunet, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, JE Campagne, A Campion, T Camporesi, V Canale, F Cao, L Carroll, C Caso, E Castelli, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, P Charpentier, P Checchia, GA Chelkov, L Chevalier, P Chliapnikov, V Chorowicz, R Cirio, MP Clara, JL Contreras, R Contri, G Cosme, F Couchot, HB Crawley, D Crennell, M Cresti, G Crosetti, N Crosland, M Crozon

Abstract:

We have studied the energy-energy angular correlations in hadronic final states from Z0 decay using the DELPHI detector at LEP. From a comparison with Monte Carlo calculations based on the exact second order QCD matrix element and string fragmentation we find that Λ (5) MS=104+25-20(stat.)+25-20(syst.) +3000)theor.). MeV, which corresponds to αs(91 GeV)=0.106±0.003(stat.)±0.003(syst.)+0.003 -0.000(theor). The theoretical error stems from different choices for the renormalization scale of αs. In the Monte Carlo simulation the scale of αs as well as the fragmentation parameters have been optimized to described reasonably well all aspects of multihadron production. © 1990.
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