LIMITS ON THE PRODUCTION OF SCALAR LEPTOQUARKS FROM Z(0) DECAYS AT LEP

被引：42

作者：

ABREU, P

ADAM, W

ADYE, T

AGASI, E

ALEKSAN, R

ALEKSEEV, GD

ALGERI, A

ALLEN, P

ALMEHED, S

ALVSVAAG, SJ

AMALDI, U

ANDREAZZA, A

ANTILOGUS, P

APEL, WD

APSIMON, RJ

ARNOUD, Y

ASMAN, B

AUGUSTIN, JE

AUGUSTINUS, A

BAILLON, P

BAMBADE, P

BARAO, F

BARATE, R

BARBIELLINI, G

BARDIN, DY

BARKER, GJ

BARONCELLI, A

BARRING, O

BARRIO, JA

BARTL, W

BATES, MJ

BATTAGLIA, M

BAUBILLIER, M

BECKS, KH

BEGALLI, M

BEILLIERE, P

BELOKOPYTOV, Y

BELTRAN, P

BENEDIC, D

BENVENUTI, AC

BERGGREN, M

BERTRAND, D

BIANCHI, F

BILENKY, MS

BILLOIR, P

BJARNE, J

BLOCH, D

BLOCKI, J

BLYTH, S

BOCCI, V

机构：

[1] IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA

[2] IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA

[3] UNIV INSTELLING ANTWERP, DEPT PHYS, B-2610 Antwerp, BELGIUM

[4] VUB ULB, IIHE, B-1050 BRUSSELS, BELGIUM

[5] UNIV ETAT MONS, FAC SCI, B-7000 MONS, BELGIUM

[6] UNIV ATHENS, PHYS LAB, GR-10680 ATHENS, GREECE

[7] UNIV BERGEN, DEPT PHYS, N-5007 BERGEN, NORWAY

[8] UNIV BOLOGNA, DIPARTIMENTO FIS, I-40126 BOLOGNA, ITALY

[9] INFN, I-40126 BOLOGNA, ITALY

[10] COLL FRANCE, PHYS CORPUSCULAIRE LAB, IN2P3, CNRS, F-75231 PARIS 05, FRANCE

[11] CERN, CH-1211 GENEVA 23, SWITZERLAND

[12] ULP, IN2P3, CNRS, CTR RECH NUCL, F-67037 STRASBOURG, FRANCE

[13] NCSR DEMOKRITOS, INST NUCL PHYS, GR-15310 ATHENS, GREECE

[14] CAS, DIV HIGH ENERGY PHYS, INST PHYS FZU, CS-18040 PRAGUE 8, CZECHOSLOVAKIA

[15] UNIV GENOA, DIPARTIMENTO FIS, I-16146 GENOA, ITALY

[16] INFN, I-16146 GENOA, ITALY

[17] UNIV GRENOBLE 1, IN2P3, CNRS, INST SCI NUCL, F-38026 GRENOBLE, FRANCE

[18] SEFT, HIGH ENERGY PHYS RES INST, SF-00170 HELSINKI, FINLAND

[19] JOINT NUCL RES INST, MOSCOW 101000, RUSSIA

[20] UNIV KARLSRUHE, INST EXPTL KERNPHYS, W-7500 KARLSRUHE 1, GERMANY

[21] INST NUCL PHYS, HIGH ENERGY PHYS LAB, PL-30055 KRAKOW 30, POLAND

[22] CTR BRASILEIRO PESQUISAS FIS, BR-22290 RIO DE JANEIRO, BRAZIL

[23] UNIV PARIS 11, ACCELERATEUR LINEAIRE LAB, IN2P3, CNRS, F-91405 ORSAY, FRANCE

[24] UNIV LANCASTER, SCH PHYS & MAT, LANCASTER LA1 4YB, ENGLAND

[25] UNIV LIVERPOOL, DEPT PHYS, LIVERPOOL L69 3BX, ENGLAND

[26] UNIV PARIS 06, IN2P3, CNRS, LPNHE, F-75252 PARIS 05, FRANCE

[27] UNIV PARIS 07, IN2P3, CNRS, LPNHE, F-75252 PARIS 05, FRANCE

[28] LUND UNIV, DEPT PHYS, S-22363 LUND, SWEDEN

[29] UNIV LYON 1, IPNL, IN2P3, CNRS, F-69622 VILLEURBANNE, FRANCE

[30] UNIV COMPLUTENSE MADRID, E-28040 MADRID, SPAIN

[31] UNIV AIX MARSEILLE 2, CPP, IN2P3, CNRS, F-13288 MARSEILLE 09, FRANCE

[32] UNIV MILAN, DIPARTIMENTO FIS, I-20133 MILAN, ITALY

[33] INFN, I-20133 MILAN, ITALY

[34] NIELS BOHR INST, DK-2100 COPENHAGEN 0, DENMARK

[35] CHARLES UNIV, MFF, CTR NUCL, CS-18000 PRAGUE 8, CZECHOSLOVAKIA

[36] NATL INST NUCL PHYS & HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS

[37] NATL TECH UNIV ATHENS, DEPT PHYS, GR-15773 ATHENS, GREECE

[38] UNIV OSLO, DEPT PHYS, N-1000 OSLO 3, NORWAY

[39] UNIV OVIEDO, DEPT FIS, E-33006 OVIEDO, SPAIN

[40] UNIV OXFORD, DEPT PHYS, OXFORD OX1 3RH, ENGLAND

[41] UNIV PADUA, DIPARTIMENTO FIS, I-35131 PADUA, ITALY

[42] INFN, I-35131 PADUA, ITALY

[43] PONTIFICIA UNIV CATOLICA, DEPT FIS, BR-22453 RIO DE JANEIRO, BRAZIL

[44] RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND

[45] UNIV ROMA TOR VERGATA, DIPARTIMENTO FIS, I-00173 ROME, ITALY

[46] INFN, I-00173 ROME, ITALY

[47] CTR ETUD SACLAY, DSM DAPNIA, F-91191 GIF SUR YVETTE, FRANCE

[48] UNIV SALERNO, DIPARTIMENTO FIS, I-84100 SALERNO, ITALY

[49] IST SUPER SANITA, IST NAZ FIS NUCL, I-00161 ROME, ITALY

[50] UNIV CANTABRIA, CSIC, CEAFM, E-39006 SANTANDER, SPAIN

来源：

PHYSICS LETTERS B | 1993年 / 316卷 / 04期

关键词：

D O I：

10.1016/0370-2693(93)91053-P

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search has been made for pairs and for single production of scalar leptoquarks of the first and second generations using a data sample of 392000 Z0 decays from the DELPHI detector at LEP 1. No signal was found and limits on the leptoquark mass, production cross section and branching ratio were set. A mass limit at 95% confidence level of 45.5 GeV/c2 was obtained for leptoquark pair production. The search for the production of a single leptoquark probed the mass region above this limit and its results exclude first and second generation leptoquarks D0 with masses below 65 GeV/c2 and 73 GeV/c2 respectively, at 95% confidence level, assuming that the D0lq Yukawa coupling alpha(lambda) is equal to the electromagnetic one. An upper limit is also given on the coupling alpha(lambda) as a function of the leptoquark mass m(D0).

引用

页码：620 / 630

页数：11

共 34 条

[1]

Aarnio P, 1991, NUCL INSTRUM METH A, V303, P233

[2] SEARCH FOR SCALAR LEPTOQUARKS FROM Z(0) DECAYS [J].

ABREU, P ;

ADAM, W ;

ADAMI, F ;

ADYE, T ;

AKESSON, T ;

ALEKSEEV, GD ;

ALLEN, P ;

ALMEHED, S ;

ALVSVAAG, SJ ;

AMALDI, U ;

ANASSONTZIS, E ;

ANTILOGUS, P ;

APEL, WD ;

APSIMON, RJ ;

ASMAN, B ;

ASTIER, P ;

AUGUSTIN, JE ;

AUGUSTINUS, A ;

BAILLON, P ;

BAMBADE, P ;

BARAO, F ;

BARATE, R ;

BARBIELLINI, G ;

BARDIN, DY ;

BARONCELLI, A ;

BARRING, O ;

BARTL, W ;

BATES, MJ ;

BATTAGLIA, M ;

BAUBILLIER, M ;

BECKS, KH ;

BEESTON, CJ ;

BEGALLI, M ;

BEILLIERE, P ;

BELOKOPYTOV, Y ;

BELTRAN, P ;

BENEDIC, D ;

BENLLOCH, JM ;

BERGGREN, M ;

BERTRAND, D ;

BIANCHI, F ;

BILENKY, MS ;

BILLOIR, P ;

BJARNE, J ;

BLOCH, D ;

BLYTH, S ;

BOCCI, V ;

BOGOLUBOV, PN ;

BOLOGNESE, T ;

BONAPART, M .

PHYSICS LETTERS B, 1992, 275 (1-2) :222-230

[3] PRODUCTION OF STRANGE PARTICLES IN THE HADRONIC DECAYS OF THE Z(0) [J].

ABREU, P ;

ADAM, W ;

ADAMI, F ;

ADYE, T ;

AKESSON, T ;

ALEKSEEV, GD ;

ALLEN, P ;

ALMEHED, S ;

ALVSVAAG, SJ ;

AMALDI, U ;

ANASSONTZIS, E ;

ANTILOGUS, P ;

APEL, WD ;

APSIMON, RJ ;

ASMAN, B ;

AUGUSTIN, JE ;

AUGUSTINUS, A ;

BAILLON, P ;

BAMBADE, P ;

BARAO, F ;

BARATE, R ;

BARBIELLINI, G ;

BARDIN, DY ;

BARONCELLI, A ;

BARRING, O ;

BARTL, W ;

BATES, MJ ;

BATTAGLIA, M ;

BAUBILLIER, M ;

BECKS, KH ;

BEESTON, CJ ;

BEGALLI, M ;

BEILLIERE, P ;

BELOKOPYTOV, Y ;

BELTRAN, P ;

BENEDIC, D ;

BENLLOCH, JM ;

BERGGREN, M ;

BERTRAND, D ;

BIANCHI, F ;

BILENKY, MS ;

BILLOIR, P ;

BJARNE, J ;

BLOCH, D ;

BLYTH, S ;

BOCCI, V ;

BOGOLUBOV, PN ;

BOLOGNESE, T ;

BONAPART, M ;

BONESINI, M .

PHYSICS LETTERS B, 1992, 275 (1-2) :231-242

[4] A SEARCH FOR LEPTOQUARKS, LEPTOGLUONS AND EXCITED LEPTONS IN H1 AT HERA [J].

ABT, I ;

AHMED, T ;

ANDREEV, V ;

ANDRIEU, B ;

APPUHN, RD ;

ARPAGAUS, M ;

BABAEV, A ;

BARWOLFF, H ;

BAN, J ;

BARANOV, P ;

BARRELET, E ;

BARTEL, W ;

BASSLER, U ;

BECK, HP ;

BEHREND, HJ ;

BELOUSOV, A ;

BERGER, C ;

BERGSTEIN, H ;

BERNARDI, G ;

BERNET, R ;

BERTRANDCOREMANS, G ;

BESANCON, M ;

BIDDULPH, P ;

BINDER, E ;

BISCHOFF, A ;

BIZOT, JC ;

BLOBEL, V ;

BORRAS, K ;

BOSETTI, PC ;

BOUDRY, V ;

BOURDARIOS, C ;

BRASSE, F ;

BRAUN, U ;

BRAUNSCHWEIG, W ;

BRISSON, V ;

BRUNCKO, D ;

BUNGENER, L ;

BURGER, J ;

BUSSER, FW ;

BUNIATIAN, A ;

BURKE, S ;

BUSCHHORN, G ;

CAMPBELL, AJ ;

CARLI, T ;

CHARLES, F ;

CLARKE, D ;

CLEGG, AB ;

COLOMBO, M ;

COUGHLAN, JA ;

COURAU, A .

NUCLEAR PHYSICS B, 1993, 396 (01) :3-23

[5] SEARCH FOR LEPTOQUARKS IN Z0 DECAYS [J].

ADEVA, B .

PHYSICS LETTERS B, 1991, 261 (1-2) :169-176

[6]

AKRAWY M, 1991, PHYS LETT B, V263, P123

[7] A SEARCH FOR SCALAR LEPTOQUARKS AT THE CERN PBARP COLLIDER [J].

ALITTI, J ;

AMBROSINI, G ;

ANSARI, R ;

AUTIERO, D ;

BAREYRE, P ;

BERTRAM, IA ;

BLAYLOCK, G ;

BONAMY, P ;

BORER, K ;

BOURLIAUD, M ;

BUSKULIC, D ;

CARBONI, G ;

CAVALLI, D ;

CAVASINNI, V ;

CENCI, P ;

CHOLLET, JC ;

CONTA, C ;

COSTA, G ;

COSTANTINI, F ;

COZZI, L ;

CRAVERO, A ;

CURATOLO, M ;

DELLACQUA, A ;

DELPRETE, T ;

DEWOLF, RS ;

DILELLA, L ;

DUCROS, Y ;

EGAN, GF ;

EINSWEILER, KF ;

ESPOSITO, B ;

FAYARD, L ;

FEDERSPIEL, A ;

FERRARI, R ;

FRATERNALI, M ;

FROIDEVAUX, D ;

FUMAGALLI, G ;

GAILLARD, JM ;

GIANOTTI, F ;

GILDEMEISTER, O ;

GOSSLING, C ;

GOGGI, VG ;

GRUNENDAHL, S ;

HARA, K ;

HELLMAN, S ;

HRIVNAC, J ;

HUFNAGEL, H ;

HUGENTOBLER, E ;

HULTQVIST, K ;

IACOPINI, E ;

INCANDELA, J .

PHYSICS LETTERS B, 1992, 274 (3-4) :507-512

[8] SEARCH FOR NEW QUARKS SUGGESTED BY THE SUPERSTRING [J].

ANGELOPOULOS, VD ;

ELLIS, J ;

KOWALSKI, H ;

NANOPOULOS, DV ;

TRACAS, ND ;

ZWIRNER, F .

NUCLEAR PHYSICS B, 1987, 292 (01) :59-92

[9] ACCOMPANIED DILEPTONS AS A PROBE OF AN EFFECTIVE QUARK-LEPTON CONTACT INTERACTION AT E+E- COLLIDERS [J].

ARGYRES, EN ;

KORAKIANITIS, O ;

PAPADOPOULOS, CG ;

VLASSOPULOS, SDP .

NUCLEAR PHYSICS B, 1991, 354 (01) :1-23

[10]

BAMBADE P, 1992, DELPHI9232 NOT

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