DETERMINATION OF THE NUMBER OF LIGHT NEUTRINO SPECIES FROM SINGLE-PHOTON PRODUCTION AT LEP

Authors
ACCIARRI M ADRIANI O AGUILARBENITEZ M AHLEN S ALCARAZ J ALEMANNI G ALLABY J ALOISIO A ALVIGGI MG AMBROSI G ANDERHUB H ANDREEV VP ANGELESCU T ANSELMO F AREFIEV A AZEMOON T AZIZ T BAGNAIA P BAKSAY L BALL RC BANERJEE S BANERJEE S BANICZ K BARCZYK A BARILLERE R BARONE L BARTALINI P BASCHIROTTO A BASILE M BATTISTON R BAY A BECATTINI F BECKER U BEHNER F BERDUGO J BERGES P BERTUCCI B BETEV BL BHATTACHARYA S BIASINI M BILAND A BILEI GM BIZZARRI R BLAISING JJ BLYTH SC BOBBINK GJ BOCK R BOHM A BOLDIZSAR L BORGIA B BOURILKOV D BOURQUIN M BOUTIGNY D BRACCINI S BRANSON JG BRIGLJEVIC V BROCK IC BUFFINI A BUIJS A BURGER JD BURGER WJ BUSENITZ J CAI XD CAMPANELLI M CAPELL M ROMEO GC CARLINO G CARTACCI AM CASAUS J CASTELLINI G CAVALLARI F CAVALLO N CECCHI C CERRADA M CESARONI F CHAMIZO M CHANG YH CHATURVEDI UK CHEKANOV SV CHEMARIN M CHEN A CHEN G CHEN GM CHEN HF CHEN HS CHEN M CHIEFARI G CHIEN CY CIFARELLI L CINDOLO F CIVININI C CLARE I CLARE R COHN HO COIGNET G COLIJN AP COLINO N COSTANTINI S COTOROBAI F DELACRUZ B CSILLING A DAI TS DALESSANDRO R DEASMUNDIS R DEGRE A DEITERS K DENES P DENOTARISTEFANI F DIBITONTO D DIEMOZ M VANDIERENDONCK D DILODOVICO F DIONISI C DITTMAR M DOMINGUEZ A DORIA A DOVA MT DRAGO E DUCHESNEAU D DUINKER P DURAN I DUTTA S EASO S EFREMENKO Y ELMAMOUNI H ENGLER A EPPLING FJ ERNE FC ERNENWEIN JP EXTERMANN P FABRE M FACCINI R FALCIANO S FAVARA A FAY J FEDIN O FELCINI M FENYI B FERGUSON T FERRONI F FESEFELDT H FIANDRINI E FIELD JH FILTHAUT F FISHER PH FISK I FORCONI G FREDJ L FREUDENREICH K FURETTA C GALAKTIONOV Y GANGULI SN GARCIAABIA P GAU SS GENTILE S GERALD J GHEORDANESCU N GIAGU S GOLDFARB S GOLDSTEIN J GONG ZF GOUGAS A GRATTA G GRUNEWALD MW GUPTA VK GURTU A GUTAY LJ HAAS D HARTMANN B HASAN A HATZIFOTIADOU D HEBBEKER T HERVE A HIRSCHFELDER J VANHOEK WC HOFER H HOORANI H HOU SR HU G INNOCENTE V JENKES K JIN BN JONES LW DEJONG P JOSAMUTUBERRIA I KASSER A KHAN RA KAMRAD D KAMYSHKOV Y KAPUSTINSKY JS KARYOTAKIS Y KAUR M KIENZLEFOCACCI MN KIM D KIM DH KIM JK KIM SC KINNISON WW KIRKBY A KIRKBY D KIRKBY J KISS D KITTEL W KLIMENTOV A KONIG AC KOPP A KOROLKO I KOUTSENKO V KRAEMER RW KRENZ W KUNIN A LACENTRE P DEGUEVARA PL LANDI G LAPOINT C LASSILAPERINI K LAURIKAINEN P LAVORATO A LEBEAU M LEBEDEV A LEBRUN P LECOMTE P LECOQ P LECOULTRE P LEE HJ LEGGETT C LEGOFF JM LEISTE R LEONARDI E LEVTCHENKO P LI C LIN CH LIN WT LINDE FL LISTA L LIU ZA LOHMANN W LONGO E LU W LU YS LUBELSMEYER K LUCI C LUCKEY D LUMINARI L LUSTERMANN W MA WG MAITY M MAJUMDER G MALGERI L MALININ A MANA C MANGEOL D MANGLA S MARCHESINI P MARIN A MARTIN JP MARZANO F MASSARO GGG MCNALLY D MELE S MEROLA L MESCHINI M METZGER WJ VONDERMEY M MI Y MIGANI D MIHUL A VANMIL AJW MILCENT H MIRABELLI G MNICH J MOLNAR P MONTELEONI B MOORE R MOULIK T MOUNT R MUHEIM F MUIJS AJM NAHN S NAPOLITANO M NESSITEDALDI F NEWMAN H NIESSEN T NIPPE A NISATI A NOWAK H OH YD OPITZ H ORGANTINI G OSTONEN R PALIT S PALOMARES C PANDOULAS D PAOLETTI S PAOLUCCI P PARK HK PARK IH PASCALE G PASSALEVA G PATRICELLI S PAUL T PAULUZZI M PAUS C PAUSS F PEACH D PEI YJ PENSOTTI S PERRETGALLIX D PETERSEN B PETRAK S PEVSNER A PICCOLO D PIERI M PIROUE PA PISTOLESI E PLYASKIN V POHL M POJIDAEV V POSTEMA H PRODUIT N PROKOFIEV D QUARTIERI J RAHALCALLOT G RAJA N RANCOITA PG RATTAGGI M RAVEN G RAZIS P READ K REN D RESCIGNO M REUCROFT S VANRHEE T RIEMANN S RILES K RIND O ROBOHM A RODIN J ROE BP ROMERO L ROSIERLEES S ROSSELET P VANROSSUM W ROTH S RUBIO JA RUSCHMEIER D RYKACZEWSKI H SALICIO J SANCHEZ E SANDERS MP SARAKINOS ME SARKAR S SAUVAGE G SCHAFER C SCHEGELSKY V SCHMIDTKAERST S SCHMITZ D SCHNEEGANS M SCHOLZ N SCHOPPER H SCHOTANUS DJ SCHWENKE J SCHWERING G SCIACCA C SCIARRINO D SERVOLI L SHEVCHENKO S SHIVAROV N SHOUTKO V SHUKLA J SHUMILOV E SHVOROB A SIEDENBURG T SON D SOULIMOV V SMITH B SPILLANTINI P STEUER M STICKLAND DP STONE H STOYANOV B STRAESSNER A SUDHAKAR K SULTANOV G SUN LZ SUSINNO GF SUTER H SWAIN JD TANG XW TAUSCHER L TAYLOR L TING SCC TING SM TONWAR SC TOTH J TULLY C TUCHSCHERER H TUNG KL UCHIDA Y ULBRICHT J UWER U VALENTE E VESZTERGOMBI G VETLITSKY I VIERTEL G VIVARGENT M VLACHOS S VOLKERT R VOGEL H VOGT H VOROBIEV I VOROBYOV AA VORVOLAKOS A WADHWA M WALLRAFF W WANG WC WANG XL WANG ZM WEBER A WU SX WYNHOFF S XU J XU ZZ YANG BZ YANG CG YAO XY YE JB YEH SC YOU JM ZALITE A ZALITE Y ZEMP P ZENG Y ZHANG Z ZHANG ZP ZHOU B ZHOU Y ZHU GY ZHU RY ZICHICHI A ZIEGLER F
Citation
M. Acciarri et al., DETERMINATION OF THE NUMBER OF LIGHT NEUTRINO SPECIES FROM SINGLE-PHOTON PRODUCTION AT LEP, Physics letters. Section B, 431(1-2), 1998, pp. 199-208
Citations number
45
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
431
Issue
1-2
Year of publication
1998
Pages
199 - 208
Database
ISI
SICI code
0370-2693(1998)431:1-2<199:DOTNOL>2.0.ZU;2-7
Abstract
A determination of the number of light neutrino families performed by measuring the cross section of single photon production in e(+)e(-) co llision near the Z resonance is reported. From an integrated luminosit y of 100 pb(-1), collected during the years 1991-94, we have observed 2091 single photon candidates with an energy above 1 GeV in the polar angular region 45 degrees < theta(gamma) < 135 degrees. From a maximum likelihood fit to the single photon cross section, the Z decay width into invisible particles is measured to be Gamma(inv) = 498 +/- 12(sta t) +/- 12(sys)MeV. Using the Standard Model couplings of neutrinos to the Z, the number of light neutrino species is determined to be N-v = 2.98 +/- 0.07(stat) +/- 0.07(sys). (C) 1998 Published by Elsevier Scie nce B.V. All rights reserved.