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Multiplicity dependence of mean transverse momentum in e+e- annihilations at LEP energies

Physics Letters B 276:1-2 (1992) 254-262

Authors:

P Abreu, W Adam, F Adami, T Adye, T Akesson, GD Alekseev, P Allen, S Almehed, SJ Alvsvaag, U Amaldi, E Anassontzis, P Antilogus, WD Apel, RJ Apsimon, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, R Barate, G Barbiellini, DY Bardin, A Baroncelli, O Barring, W Bartl, MJ Bates, M Battaglia, M Baubillier, KH Becks, CJ Beeston, M Begalli, P Beilliere, Y Belokopytov, K Belous, P Beltran, D Benedic, JM Benlloch, M Berggren, D Bertrand, F Bianchi, MS Bilenky, P Billoir, J Bjarne, D Bloch, S Blyth, V Bocci, PN Bogolubov, T Bolognese, M Bonapart, M Bonesini, W Bonivento, PSL Booth, P Borgeaud, G Borisov, H Borner, C Bosio, B Bostjancic, O Botner, B Bouquet, C Bourdarios, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, H Briand, C Bricman, RCA Brown, N Brummer, JM Brunet, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, A Campion, T Camporesi, V Canale, F Cao, F Carena, L Carroll, C Caso, E Castelli, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, A Chan, P Charpentier, L Chaussard, J Chauveau, P Checchia, GA Chelkov, L Chevalier, P Chliapnikov, V Chorowicz, R Cirio

Abstract:

A strong increase of the mean transverse momentum 〈pt〉 with the number of charged particles nch is observed in e+e - annihilations into hadrons at LEP energies. The effect resembles correlations observed in hadron-hadron interactions. In e+e- annihilations the 〈Pt〉 and nch correlations can be accounted for by gluon radiation. © 1992.
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Production of strange particles in the hadronic decays of the Z0

Physics Letters B 275:1-2 (1992) 231-242

Authors:

P Abreu, W Adam, F Adami, T Adye, T Akesson, GD Alekseev, P Allen, S Almehed, SJ Alvsvaag, U Amaldi, E Anassontzis, P Antilogus, WD Apel, RJ Apsimon, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, R Barate, G Barbiellini, DY Bardin, A Baroncelli, O Barring, W Bartl, MJ Bates, M Battaglia, M Baubillier, KH Becks, CJ Beeston, M Begalli, P Beilliere, Y Belokopytov, P Beltran, D Benedic, JM Benlloch, M Berggren, D Bertrand, F Bianchi, MS Bilenky, P Billoir, J Bjarne, D Bloch, S Blyth, V Bocci, PN Bogolubov, T Bolognese, M Bonapart, M Bonesini, W Bonivento, PSL Booth, P Borgeaud, G Borisov, H Borner, C Bosio, B Bostjancic, O Botner, B Bouquet, C Bourdarios, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, H Briand, C Bricman, RCA Brown, N Brummer, JM Brunet, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJC Rozas, A Campion, T Camporesi, V Canale, F Cao, F Carena, L Carroll, C Caso, E Castelli, MVC Gimenez, A Cattai, FR Cavallo, L Cerrito, A Chan, M Chapkin, P Charpentier, L Chaussard, J Chauveau, P Checchia, GA Chelkov, L Chevalier, P Chliapnikov, V Chorowicz, R Cirio

Abstract:

An analysis of the production of strange particles from the decays of the Z0 boson into multihadronic final states is presented. The analysis is based on about 90 000 selected hadronic Z0 decays collected by the DELPHI detector at LEP in 1990. Ks0, K*±, Λ(Λ) and Ξ- (Ξ+) have been identified by their characteristic decays. The measured production cross sections are compared with predictions of the Lund Monte Carlo tuned to data at PEP/PETRA energies. © 1992.
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Search for scalar leptoquarks from Z0 decays

Physics Letters B 275:1-2 (1992) 222-230

Authors:

P Abreu, W Adam, F Adami, T Adye, T Akesson, GD Alekseev, P Allen, S Almehed, SJ Alvsvaag, UA Amaldi, E Anassontzis, P Antilogus, WD Apel, RJ Apsimon, B Åsman, P Astier, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, R Barate, G Barbiellini, DY Bardin, A Baroncelli, O Barring, W Bartl, MJ Bates, M Battaglia, M Baubillier, KH Beckes, CJ Beeston, M Begalli, P Beilliere, Y Belokopytov, P Beltran, D Benedic, JM Benlloch, M Berggren, D Bertrand, F Bianchi, MS Bilenky, P Billoir, J Bjarne, D Bloch, S Blyth, V Bocci, PN Bogolubov, T Bolognese, M Bonapart, M Bonesini, W Bonievento, PSL Booth, M Boratav, P Borgeaud, H Borner, C Bosio, B Bostjancic, O Botner, B Bouquet, M Bozzo, S Braibant, P Branchini, KD Brand, RA Benner, C Bricman, RCA Brown, N Brummer, JM Brunet, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, A Campin, T Camporesi, V Canale, F Cao, F Carena, L Carroll, C Caso, E Castelli, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, A Chan, M Chapkin, P Charpentier, P Checchia, GA Chelkov, L Chevalier, P Chliapnikov, V Chorowicz, R Cirio, MP Clara, P Collins, JL Contreras

Abstract:

We have searched for pair produced scalar leptoquarks each decaying to a quark and a charged lepton in a sample of 116 000 hadronic Z0 events produced at LEP. No candidate was detected and cross section and branching ratio limits are set for the above process at 95% CL. Mass limits are found to be about 42 GeV/c2 depending only slightly on the models used and a coupling times branching ratio exclusion line is drawn for a scalar leptoquark with a free coupling. We have also probed the mass region above 45 GeV/c2 for a singly produced scalar leptoquark and set limits on the cross section and the coupling λ2/4π up to 60 GeV. © 1992.
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Study of orientation of three-jet events in Z0 hadronic decays using the DELPHI detector

Physics Letters B 274:3-4 (1992) 498-506

Authors:

P Abreu, W Adam, F Adami, T 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 Åsman, 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, K Belous, 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 Bonatav, 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, M Chapkin, P Charpentier, P Checchia, GA Chelkov, L Chevalier, P Chliapnikov, V Chorowicz, R Cirio, MP Clara, P Collins

Abstract:

The study of the orientation of three-jet events from e+e- → Z0 → multi-hadrons is presented, in particular the polar angle distributions of the thrust axis and of the normal to the three-jet plane, and the azimuthal correlations between the hadron plane and the one defined by the beam and thrust axes. The data are compared with results at lower energy and with QCD predictions. Good agreement with QCD predictions is observed. The scalar gluon theory is excluded by the data. © 1992.
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A MEASUREMENT OF IOTA-TOT(GAMMA-P) AT ROOT-S=210GEV

PHYSICS LETTERS B 293:3-4 (1992) 465-477

Authors:

M DERRICK, D KRAKAUER, S MAGILL, B MUSGRAVE, J REPOND, K SUGANO, R STANEK, RL TALAGA, J THRON, F ARZARELLO, R AVED, G BARBAGLI, G BARI, M BASILE, L BELLAGAMBA, D BOSCHERINI, G BRUNI, P BRUNI, GC ROMEO, G CASTELLINI, M CHIARINI, L CIFARELLI, F CINDOLO, F CIRALLI, A CONTIN, S DAURIA, C DELPAPA, F FRASCONI, P GIUSTI, G IACOBUCCI, G LAURENTI, G LEVI, Q LIN, B LISOWSKI, G MACCARRONE, A MARGOTTI, T MASSAM, R NANIA, C NEMOZ, F PALMONARI, G SARTORELLI, R TIMELLINI, YZ GARCIA, A ZICHICHI, A BARGENDE, F BARREIRO, J CRITTENDEN, H DABBOUS, K DESCH, B DIEKMANN, M GEERTS, G GEITZ, B GUTJAHR, H HARTMANN, J HARTMANN, D HAUN, K HEINLOTH, E HILGER, HP JAKOB, S KRAMARCZYK, M KUCKES, A MASS, S MENGEL, J MOLLEN, H MUSCH, E PAUL, R SCHATTEVOY, B SCHNEIDER, JL SCHNEIDER, R WEDEMEYER, A CASSIDY, DG CUSSANS, N DYCE, HF FAWCETT, B FOSTER, R GILMORE, GP HEATH, M LANCASTER, TJ LLEWELLYN, J MALOS, CJS MORGADO, RJ TAPPER, SS WILSON, RR RAU, A BERNSTEIN, A CALDWELL, I GIALAS, JA PARSONS, S RITZ, F SCIULLI, PB STRAUB, L WAI, S YANG, T BARILLARI, M SCHIOPPA, G SUSINNO, W BURKOT, J CHWASTOWSKI, A DWURAZNY, A ESKREYS, B NIZIOL, Z JAKUBOWSKI, K PIOTRZKOWSKI, M ZACHARA, L ZAWIEJSKI, P BORZEMSKI, K ESKREYS, K JELEN, D KISIELEWSKA, T KOWALSKI, J KULKA, E RULIKOWSKAZAREBSKA, L SUSZYCKI, J ZAJAC, T KEDZIERSKI, A KOTANSKI, M PRZYBYCIEN, LAT BAUERDICK, U BEHRENS, JK BIENLEIN, C COLDEWEY, A DANNEMANN, K DIERKS, W DORTH, G DREWS, P ERHARD, M FLASINSKI, I FLECK, A FURTJES, R GLASER, P GOTTLICHER, T HAAS, L HAGGE, W HAIN, D HASELL, H HULTSCHIG, G JAHNEN, P JOOS, M KASEMANN, R KLANNER, W KOCH, U KOTZ, H KOWALSKI, J LABS, A LADAGE, B LOHR, M LOWE, D LUKE, J MAINUSCH, O MANCZAK, M MOMAYEZI, S NICKEL, D NOTZ, I PARK, KU POSNECKER, M ROHDE, E ROS, U SCHNEEKLOTH, J SCHROEDER, W SCHULZ, F SELONKE, E TSCHESLOG, T TSURUGAI, F TURKOT, W VOGEL, T WOENIGER, G WOLF, C YOUNGMAN, HJ GRABOSCH, A LEICH, A MEYER, C RETHFELDT, S SCHLENSTEDT, R CASALBUONI, S DECURTIS, D DOMINICI, A FRANCESCATO, M NUTI, P PELFER, G ANZIVINO, R CASACCIA, I LAAKSO, S DEPASQUALE, S QIAN, L VOTANO, A BAMBERGER, A FREIDHOF, T POSER, S SOLDNERREMBOLD, G THEISEN, T TREFZGER, NH BROOK, PJ BUSSEY, AT DOYLE, JR FORBES, VA JAMIESON, C RAINE, DH SAXON, G GLOTH, U HOLM, H KAMMERLOCHER, B KREBS, T NEUMANN, K WICK, A HOFMANN, W KROGER, J KRUGER, E LOHRMANN, J MILEWSKI, M NAKAHATA, N PAVEL, G POELZ, R SALOMON, A SEIDMAN, W SCHOTT, BH WIIK, F ZETSCHE, TC BACON, I BUTTERWORTH, C MARKOU, D MCQUILLAN, DB MILLER, MM MOBAYYEN, A PRINIAS, A VORVOLAKOS, T BIENZ, H KREUTZMANN, U MALLIK, E MCCLIMENT, M ROCO, MZ WANG, P CLOTH, D FILGES, L CHEN, R IMLAY, S KARTIK, HJ KIM, RR MCNEIL, W METCALF, G CASES, L HERVAS, L LABARGA, J DELPESO, J ROLDAN, J TERRON, JF DETROCONIZ, F IKRAIAM, JK MAYER, GR SMITH, F CORRIVEAU, DJ GILKINSON, DS HANNA, LW HUNG, JW MITCHELL, PM PATEL, LE SINCLAIR, DG STAIRS, R ULLMANN, GL BASHINDZHAGYAN, PF ERMOLOV, YA GOLUBKOV, VA KUZMIN, EN KUZNETSOV, AA SAVIN, AG VORONIN, NP ZOTOV, S BENTVELSEN, A DAKE, J ENGELEN, P DEJONG, S DEJONG, M DEKAMPS, P KOOIJMAN, A KRUSE, H VANDERLUGT, V ODELL, J STRAVER, A TENNER, H TIECKE, H UIJTERWAAL, J VERMEULEN, L WIGGERS, E DEWOLF, R VANWOUDENBERG, R YOSHIDA, B BYLSMA, LS DURKIN, C LI, TY LING, KW MCLEAN, WN MURRAY, SK PARK, TA ROMANOWSKI, R SEIDLEIN, GA BLAIR, JM BUTTERWORTH, A BYRNE, RJ CASHMORE, AM COOPERSARKAR, RCE DEVENISH, DM GINGRICH, PM HALLAMBAKER, N HARNEW, T KHATRI, KR LONG, P LUFFMAN, J MCARTHUR, P MORAWITZ, J NASH, SJP SMITH, NC ROOCROFT, FF WILSON, G ABBIENDI, R BRUGNERA, R CARLIN, F DALCORSO, M DEGIORGI, U DOSSELLI, C FANIN, F GASPARINI, S LIMENTANI, M MORANDIN, M POSOCCO, J STANCO, R STROILI, C VOCI, JN LIM, BY OH, J WHITMORE, M BONORI, U CONTINO, G DAGOSTINI, M GUIDA, M IORI, S MARI, G MARINI, M MATTIOLI, D MONALDI, A NIGRO, JC HART, NA MCCUBBIN, TP SHAH, TL SHORT, E BARBERIS, N CARTIGLIA, C HEUSCH, B HUBBARD, J LESLIE, JST NG, K OSHAUGHNESSY, HF SADROZINSKI, A SEIDEN, E BADURA, J BILTZINGER, H CHAVES, M ROST, RJ SEIFERT, AH WALENTA, W WEIHS, G ZECH, S DAGAN, R HEIFETZ, A LEVY, D ZERZION, T HASEGAWA, M HAZUMI, T ISHII, S KASAI, M KUZE, Y NAGASAWA, M NAKAO, H OKUNO, K TOKUSHUKU, T WATANABE, S YAMADA, M CHIBA, R HAMATSU, T HIROSE, S KITAMURA, S NAGAYAMA, Y NAKAMITSU, M ARNEODO, M COSTA, MI FERRERO, L LAMBERTI, S MASELLI, C PERONI, A SOLANO, A STAIANO, M DARDO, DC BAILEY, D BANDYOPADHYAY, F BENARD, S BHADRA, M BRKIC, BD BUROW, FS CHLEBANA, MB CROMBIE, GF HARTNER, GM LEVMAN, JF MARTIN, RS ORR, JD PRENTICE, CR SAMPSON, GG STAIRS, RJ TEUSCHER, TS YOON, FW BULLOCK, CD CATTERALL, JC GIDDINGS, TW JONES, AM KHAN, JB LANE, PL MAKKAR, D SHAW, J SHULMAN, K BLANKENSHIP, J KOCHOCKI, B LU, LW MO, K CHARCHULA, J CIBOROWSKI, J GAJEWSKI, G GRZELAK, M KASPRZAK, M KRZYZANOWSKI, K MUCHOROWSKI, RJ NOWAK, JM PAWLAK, K STOJDA, A STOPCZYNSKI, R SZWED, T TYMIENIECKA, R WALCZAK, AK WROBLEWSKI, JA ZAKRZEWSKI, AF ZARNECKI, M ADAMUS, H ABRAMOWICZ, Y EISENBERG, C GLASMAN, U KARSHON, A MONTAG, D REVEL, EE RONAT, A SHAPIRA, I ALI, B BEHRENS, U CAMERINI, S DASU, C FORDHAM, C FOUDAS, A GOUSSIOU, M LOMPERSKI, RJ LOVELESS, P NYLANDER, M PTACEK, DD REEDER, WH SMITH, S SILVERSTEIN, WR FRISKEN, KM FURUTANI, Y IGA
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