SEARCHES FOR HEAVY NEUTRINOS FROM Z-DECAYS

被引：28

作者：

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

机构：

[1] AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA

[2] CENS,DPHPE,F-91191 GIF SUR YVETTE,FRANCE

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

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

[5] DUBNA JOINT NUCL RES INST,DUBNA 101000,USSR

[6] UNIV VALENCIA,CSIC,CTR MIXTO,INST FIS CORPUSCULAR,E-46100 VALENCIA,SPAIN

[7] UNIV VALENCIA,DEPT FIS ATOM MOLEC & NUCL,E-46100 VALENCIA,SPAIN

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

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

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

[11] UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE

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

[13] UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN

[14] UNIV PARIS 06,LPNHE,F-75230 PARIS 05,FRANCE

[15] UNIV PARIS 07,LPNHE,F-75221 PARIS 05,FRANCE

[16] UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE

[17] NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS

[18] UNIV GRENOBLE 1,INST SCI NUCL,F-38026 GRENOBLE,FRANCE

[19] UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY

[20] IST NAZL FIS NUCL,TRIESTE,ITALY

[21] UNIV UDINE,IST FIS,I-33100 UDINE,ITALY

[22] IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY

[23] UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND

[24] UNIV MILAN,DIPARTMENTO FIS,I-20133 MILAN,ITALY

[25] IST NAZL FIS NUCL,I-20133 MILAN,ITALY

[26] UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY

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

[28] IST NAZL FIS NUCL,I-16146 GENOA,ITALY

[29] COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE

[30] SERPUKHOV HIGH ENERGY PHYS INST,SERPUKHOV 142284,USSR

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

[32] CTR RECH NUCL,DIV HAUTES ENERGIES,GRP DELPHI,F-67037 STRASBOURG,FRANCE

[33] LEPSI,F-67037 STRASBOURG,FRANCE

[34] UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM

[35] UNIV LIBRE BRUXELLES,B-1050 BRUSSELS,BELGIUM

[36] UNIV ETAT MONS,FAC SCI,PHYS PARTICULES ELEMENTAIRES SERV,B-7000 MONS,BELGIUM

[37] UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY

[38] IST NAZL FIS NUCL,I-10125 TURIN,ITALY

[39] UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY

[40] IST NAZL FIS NUCL,I-00173 ROME,ITALY

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

[42] UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN

[43] UNIV PADUA,DIPARTMENTO FIS,I-35131 PADUA,ITALY

[44] IST NAZL FIS NUCL,I-35131 PADUA,ITALY

[45] UNIV HELSINKI,DEPT HIGH ENERGY PHYS,SF-00710 HELSINKI 71,FINLAND

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

[47] UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN

[48] UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY

[49] IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY

[50] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011

来源：

PHYSICS LETTERS B | 1992年 / 274卷 / 02期

关键词：

D O I：

10.1016/0370-2693(92)90528-C

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have searched for possible fourth family heavy neutrinos, pair produced in Z0 decays, in a sample of about 112 000 hadronic Z0 final states collected with the DELPHI detector. For all mixing matrix elements we exclude a new Dirac neutrino lighter than 44.5 GeV at a 95% confidence level, if the neutrino couples to the electron or muon family, and lighter than 44.0 GeV, if the neutrino couples to the tau family. Depending on the values of the mixing element and to which lepton family the neutrino couples, we obtain mass limits up to 46.2 GeV. For all mixing matrix elements we exclude a new Majorana neutrino lighter than 39.0 GeV, if it couples to the electron or the muon family, and lighter than 38.2 GeV, if it couples to the tau family. Depending on the values of the mixing matrix element and to which lepton family the neutrino couples, we obtain mass limits up to 44.7 GeV. We also exclude stable new Dirac neutrinos lighter than 45.0 GeV and new Majorana neutrinos lighter than 39.5 GeV.

引用

页码：230 / 238

页数：9

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